{"id":596,"date":"2026-06-24T23:59:58","date_gmt":"2026-06-24T23:59:58","guid":{"rendered":"https:\/\/paknoteshub.online\/?p=596"},"modified":"2026-06-25T00:01:05","modified_gmt":"2026-06-25T00:01:05","slug":"workshop-122","status":"publish","type":"post","link":"https:\/\/paknoteshub.online\/?p=596","title":{"rendered":"Workshop 122"},"content":{"rendered":"\t\t
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\n\t\t\t\t\t\n\n\n \n \n Workshop Technology (122) \u2013 DAE Mechanical 1st Year \u2013 Pak Notes Hub<\/title>\n <link href=\"https:\/\/fonts.googleapis.com\/css2?family=Inter:wght@400;500;600;700&family=Fira+Code:wght@400;500&display=swap\" rel=\"stylesheet\"\/>\n <style>\n *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }\n :root {\n --green:#1a7a4a; --green-dark:#145f38; --green-light:#e8f5ee;\n --teal:#17a589; --accent:#f0b127; --dark:#1c2833; --mid:#566573;\n --light:#f4f6f7; --code-bg:#f0f4f8; --code-border:#2e86c1;\n --note-bg:#fef9e7; --note-border:#f0b127; --white:#ffffff;\n --radius:10px; --shadow:0 4px 24px rgba(26,122,74,.10);\n }\n html { scroll-behavior:smooth; }\n body { font-family:'Inter',sans-serif; background:#f2f6f3; color:var(--dark); line-height:1.7; font-size:15px; }\n nav { position:sticky; top:0; z-index:100; background:var(--green-dark); padding:0 2rem; display:flex; align-items:center; justify-content:space-between; height:56px; 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0; max-height:calc(100vh - 130px); overflow-y:auto; }\n .toc-list li a { display:flex; align-items:center; gap:.55rem; padding:.4rem 1.1rem; color:var(--mid); font-size:.81rem; font-weight:500; text-decoration:none; transition:all .18s; border-left:3px solid transparent; }\n .toc-list li a:hover,.toc-list li a.active { color:var(--green); background:var(--green-light); border-left-color:var(--green); }\n .toc-num { display:inline-flex; align-items:center; justify-content:center; min-width:20px; height:20px; border-radius:4px; background:var(--green-light); color:var(--green); font-size:.7rem; font-weight:700; flex-shrink:0; }\n .toc-list li a.active .toc-num { background:var(--green); color:#fff; }\n .unit { background:var(--white); border-radius:var(--radius); box-shadow:var(--shadow); margin-bottom:2.5rem; overflow:hidden; scroll-margin-top:72px; }\n .unit-header { background:linear-gradient(100deg,var(--green) 0%,#1d9560 100%); padding:1.4rem 1.8rem; }\n .unit-num-badge { 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border:1.5px dashed var(--green); border-radius:8px; padding:.85rem 1.1rem; margin-top:1.4rem; color:var(--green-dark); font-size:.88rem; font-weight:500; }\n .feature-grid { display:grid; grid-template-columns:repeat(auto-fill,minmax(200px,1fr)); gap:.6rem; margin:.9rem 0 1.2rem; }\n .feature-item { background:var(--green-light); border-radius:7px; padding:.6rem .9rem; font-size:.85rem; display:flex; align-items:center; gap:.5rem; color:var(--green-dark); border:1px solid #a2d9b5; font-weight:500; }\n .concept-grid { display:grid; grid-template-columns:repeat(auto-fill,minmax(190px,1fr)); gap:.8rem; margin:.9rem 0 1.2rem; }\n .concept-card { background:var(--green-light); border:1px solid #a2d9b5; border-radius:8px; padding:.85rem 1rem; }\n .concept-card .concept-name { font-weight:700; color:var(--green); font-size:.92rem; margin-bottom:.3rem; }\n .concept-card .concept-rule { font-size:.8rem; color:var(--mid); }\n #toc-section { background:var(--white); border-radius:var(--radius); box-shadow:var(--shadow); margin-bottom:2.5rem; overflow:hidden; }\n .toc-card-header { background:linear-gradient(100deg,var(--green) 0%,#1d9560 100%); padding:1.2rem 1.8rem; }\n .toc-card-header h2 { color:#fff; font-size:1.2rem; font-weight:700; }\n .toc-card-body { padding:1.4rem 1.8rem; }\n .toc-grid { display:grid; grid-template-columns:repeat(auto-fill,minmax(250px,1fr)); gap:.6rem; }\n .toc-item { background:var(--light); border-radius:7px; padding:.65rem 1rem; display:flex; align-items:center; gap:.75rem; text-decoration:none; color:var(--dark); font-size:.86rem; font-weight:500; border:1px solid #d5e5db; transition:all .18s; }\n .toc-item:hover { background:var(--green-light); border-color:var(--green); color:var(--green); transform:translateY(-1px); }\n .toc-badge { background:var(--green); color:#fff; font-size:.7rem; font-weight:700; min-width:22px; height:22px; border-radius:5px; display:inline-flex; align-items:center; justify-content:center; flex-shrink:0; }\n .congrats { background:linear-gradient(135deg,var(--green) 0%,#145f38 100%); border-radius:var(--radius); padding:2.5rem 2rem; text-align:center; color:#fff; margin-bottom:2.5rem; box-shadow:var(--shadow); }\n .congrats h2 { font-size:1.8rem; margin-bottom:.5rem; }\n .congrats p { color:#d5f5e3; font-size:1rem; }\n .progress-bar { position:fixed; top:0; left:0; height:3px; background:var(--accent); z-index:200; transition:width .1s linear; width:0%; }\n #back-top { position:fixed; bottom:2rem; right:2rem; background:var(--green); color:#fff; width:42px; height:42px; border-radius:50%; border:none; cursor:pointer; font-size:1.1rem; box-shadow:0 4px 14px rgba(26,122,74,.35); display:flex; align-items:center; justify-content:center; opacity:0; transition:opacity .25s,transform .25s; pointer-events:none; }\n #back-top.visible { opacity:1; pointer-events:auto; }\n #back-top:hover { transform:translateY(-2px); }\n @media(max-width:720px){ .page-wrap{grid-template-columns:1fr;} .sidebar{position:static;display:none;} .hero::before{display:none;} nav .nav-links{display:none;} }\n <\/style>\n<\/head>\n<body>\n<div class=\"progress-bar\" id=\"progress\"><\/div>\n<nav>\n <div class=\"nav-brand\">Pak <span>Notes Hub<\/span><\/div>\n <div class=\"nav-links\">\n <a href=\"#toc-section\">Course Outline<\/a>\n <a href=\"#unit-1\">Start<\/a>\n <a href=\"#unit-6\">Welding<\/a>\n <a href=\"#unit-12\">Revision<\/a>\n <\/div>\n<\/nav>\n\n<section class=\"hero\">\n <div class=\"hero-tag\">\ud83d\udd27 DAE Mechanical \u2014 1st Year \u2014 Subject Code 122<\/div>\n <h1>Workshop Technology<br\/><span>Complete Notes \u2014 Easy English<\/span><\/h1>\n <p>Tools \u00b7 Machines \u00b7 Welding \u00b7 Fitting \u2014 All Basics Covered Simply<\/p>\n <div class=\"hero-pills\">\n <span class=\"pill\">\ud83d\udd27 12 Units<\/span>\n <span class=\"pill\">\ud83d\udcd8 DAE 1st Year<\/span>\n <span class=\"pill\">\ud83d\udee0\ufe0f Practical Skills<\/span>\n <span class=\"pill\">\ud83d\udcdd Practice Tasks<\/span>\n <span class=\"pill\">\u2705 Easy English<\/span>\n <\/div>\n<\/section>\n\n<div class=\"page-wrap\">\n <aside class=\"sidebar\">\n <div class=\"sidebar-title\">\ud83d\udccb Course Contents<\/div>\n <ul class=\"toc-list\" id=\"toc-nav\">\n <li><a href=\"#toc-section\"><span class=\"toc-num\">\ud83d\udccb<\/span> Contents<\/a><\/li>\n <li><a href=\"#unit-1\"><span class=\"toc-num\">1<\/span> Intro & Safety<\/a><\/li>\n <li><a href=\"#unit-2\"><span class=\"toc-num\">2<\/span> Measuring Tools<\/a><\/li>\n <li><a href=\"#unit-3\"><span class=\"toc-num\">3<\/span> Bench Work<\/a><\/li>\n <li><a href=\"#unit-4\"><span class=\"toc-num\">4<\/span> Drilling<\/a><\/li>\n <li><a href=\"#unit-5\"><span class=\"toc-num\">5<\/span> Lathe Machine<\/a><\/li>\n <li><a href=\"#unit-6\"><span class=\"toc-num\">6<\/span> Welding<\/a><\/li>\n <li><a href=\"#unit-7\"><span class=\"toc-num\">7<\/span> Sheet Metal Work<\/a><\/li>\n <li><a href=\"#unit-8\"><span class=\"toc-num\">8<\/span> Fitting & Assembly<\/a><\/li>\n <li><a href=\"#unit-9\"><span class=\"toc-num\">9<\/span> Fasteners<\/a><\/li>\n <li><a href=\"#unit-10\"><span class=\"toc-num\">10<\/span> Heat Treatment<\/a><\/li>\n <li><a href=\"#unit-11\"><span class=\"toc-num\">11<\/span> Pattern Making<\/a><\/li>\n <li><a href=\"#unit-12\"><span class=\"toc-num\">12<\/span> Project & Revision<\/a><\/li>\n <\/ul>\n <\/aside>\n\n <main>\n <div id=\"toc-section\">\n <div class=\"toc-card-header\"><h2>\ud83d\udccb Table of Contents \u2014 12 Units<\/h2><\/div>\n <div class=\"toc-card-body\">\n <div class=\"toc-grid\">\n <a class=\"toc-item\" href=\"#unit-1\"><span class=\"toc-badge\">1<\/span> Introduction & Safety Rules<\/a>\n <a class=\"toc-item\" href=\"#unit-2\"><span class=\"toc-badge\">2<\/span> Measuring & Marking Tools<\/a>\n <a class=\"toc-item\" href=\"#unit-3\"><span class=\"toc-badge\">3<\/span> Bench Work<\/a>\n <a class=\"toc-item\" href=\"#unit-4\"><span class=\"toc-badge\">4<\/span> Drilling Operations<\/a>\n <a class=\"toc-item\" href=\"#unit-5\"><span class=\"toc-badge\">5<\/span> Lathe Machine<\/a>\n <a class=\"toc-item\" href=\"#unit-6\"><span class=\"toc-badge\">6<\/span> Welding<\/a>\n <a class=\"toc-item\" href=\"#unit-7\"><span class=\"toc-badge\">7<\/span> Sheet Metal Work<\/a>\n <a class=\"toc-item\" href=\"#unit-8\"><span class=\"toc-badge\">8<\/span> Fitting & Assembly<\/a>\n <a class=\"toc-item\" href=\"#unit-9\"><span class=\"toc-badge\">9<\/span> Fasteners & Threads<\/a>\n <a class=\"toc-item\" href=\"#unit-10\"><span class=\"toc-badge\">10<\/span> Heat Treatment<\/a>\n <a class=\"toc-item\" href=\"#unit-11\"><span class=\"toc-badge\">11<\/span> Pattern Making<\/a>\n <a class=\"toc-item\" href=\"#unit-12\"><span class=\"toc-badge\">12<\/span> Project & Quick Revision<\/a>\n <\/div>\n <\/div>\n <\/div>\n\n <!-- UNIT 1 -->\n <div class=\"unit\" id=\"unit-1\">\n <div class=\"unit-header\">\n <span class=\"unit-num-badge\">Unit 1<\/span>\n <h2>Introduction to Workshop & Safety Rules<\/h2>\n <p>What is a workshop, why is it important, and how to stay safe in it.<\/p>\n <\/div>\n <div class=\"unit-body\">\n <h3>What is a Workshop?<\/h3>\n <p>A <strong>workshop<\/strong> is a place where workers use machines and hand tools to make, repair, or change metal and other materials. In DAE Mechanical, you will spend a lot of time in the workshop doing practical work.<\/p>\n <div class=\"info-box\">\ud83d\udca1 Think of a workshop like a kitchen \u2014 just like a kitchen has tools (knife, spoon) and machines (blender, oven) to make food, a workshop has tools and machines to make or repair metal parts.<\/div>\n\n <h3>Types of Workshops<\/h3>\n <div class=\"concept-grid\">\n <div class=\"concept-card\"><div class=\"concept-name\">\ud83d\udd28 Fitting Shop<\/div><div class=\"concept-rule\">Cutting, filing, and joining metal parts by hand<\/div><\/div>\n <div class=\"concept-card\"><div class=\"concept-name\">\u2699\ufe0f Machine Shop<\/div><div class=\"concept-rule\">Using machines like lathe, drill, and milling to shape metal<\/div><\/div>\n <div class=\"concept-card\"><div class=\"concept-name\">\ud83d\udd25 Welding Shop<\/div><div class=\"concept-rule\">Joining metal pieces using heat<\/div><\/div>\n <div class=\"concept-card\"><div class=\"concept-name\">\ud83e\udea8 Foundry Shop<\/div><div class=\"concept-rule\">Melting metal and pouring it into moulds<\/div><\/div>\n <div class=\"concept-card\"><div class=\"concept-name\">\ud83d\udcd0 Sheet Metal Shop<\/div><div class=\"concept-rule\">Cutting and bending thin metal sheets<\/div><\/div>\n <div class=\"concept-card\"><div class=\"concept-name\">\ud83e\udeb5 Carpentry Shop<\/div><div class=\"concept-rule\">Working with wood for patterns and furniture<\/div><\/div>\n <\/div>\n\n <h3>Workshop Safety Rules<\/h3>\n <ul>\n <li>Always wear <strong>safety glasses<\/strong> to protect your eyes from flying chips.<\/li>\n <li>Wear <strong>safety shoes<\/strong> \u2014 heavy parts can fall on your feet.<\/li>\n <li>Never wear loose clothes near machines \u2014 they can get caught.<\/li>\n <li>Keep the workshop floor <strong>clean and dry<\/strong> \u2014 oil spills cause slipping.<\/li>\n <li>Never run or play in the workshop.<\/li>\n <li>Always switch off machines when not in use.<\/li>\n <li>Do not touch a machine you do not know how to use.<\/li>\n <li>Know where the <strong>fire extinguisher<\/strong> and <strong>first aid box<\/strong> are kept.<\/li>\n <\/ul>\n\n <h3>Personal Protective Equipment (PPE)<\/h3>\n\n <svg width=\"100%\" height=\"300\" viewBox=\"0 0 600 300\" style=\"margin:1rem 0;background:#f8fffe;border-radius:8px;border:2px solid #a2d9b5;\">\n <text x=\"300\" y=\"25\" font-size=\"16\" font-weight=\"700\" fill=\"#145f38\" text-anchor=\"middle\">Personal Protective Equipment (PPE) - Full Body Protection<\/text>\n <!-- Head -->\n <circle cx=\"300\" cy=\"80\" r=\"30\" fill=\"#e8f5ee\" stroke=\"#1a7a4a\" stroke-width=\"2.5\"\/>\n <text x=\"300\" y=\"88\" font-size=\"12\" font-weight=\"700\" fill=\"#1a7a4a\" text-anchor=\"middle\">Head<\/text>\n <text x=\"370\" y=\"70\" font-size=\"11\" fill=\"#1c2833\" font-weight=\"600\">Hard Hat<\/text>\n <!-- Eyes -->\n <ellipse cx=\"285\" cy=\"75\" rx=\"6\" ry=\"4\" fill=\"#17a589\"\/>\n <ellipse cx=\"315\" cy=\"75\" rx=\"6\" ry=\"4\" fill=\"#17a589\"\/>\n <rect x=\"275\" y=\"70\" width=\"50\" height=\"12\" fill=\"none\" stroke=\"#f0b127\" stroke-width=\"2\"\/>\n <text x=\"370\" y=\"85\" font-size=\"11\" fill=\"#1c2833\">Safety Glasses<\/text>\n <!-- Face Shield -->\n <path d=\"M 270 60 Q 300 55 330 60\" fill=\"none\" stroke=\"#17a589\" stroke-width=\"2\" stroke-dasharray=\"3,2\"\/>\n <text x=\"370\" y=\"100\" font-size=\"11\" fill=\"#1c2833\">Face Shield<\/text>\n <!-- Body\/Torso -->\n <rect x=\"265\" y=\"110\" width=\"70\" height=\"90\" fill=\"#e8f5ee\" stroke=\"#1a7a4a\" stroke-width=\"2.5\" rx=\"5\"\/>\n <text x=\"300\" y=\"160\" font-size=\"12\" font-weight=\"700\" fill=\"#1a7a4a\" text-anchor=\"middle\">Apron<\/text>\n <text x=\"370\" y=\"150\" font-size=\"11\" fill=\"#1c2833\" font-weight=\"600\">Overalls\/Apron<\/text>\n <!-- Arms -->\n <rect x=\"215\" y=\"120\" width=\"45\" height=\"15\" fill=\"#e8f5ee\" stroke=\"#1a7a4a\" stroke-width=\"2\" rx=\"3\"\/>\n <rect x=\"340\" y=\"120\" width=\"45\" height=\"15\" fill=\"#e8f5ee\" stroke=\"#1a7a4a\" stroke-width=\"2\" rx=\"3\"\/>\n <!-- Hands -->\n <ellipse cx=\"245\" cy=\"150\" rx=\"18\" ry=\"22\" fill=\"#fef9e7\" stroke=\"#f0b127\" stroke-width=\"2.5\"\/>\n <ellipse cx=\"355\" cy=\"150\" rx=\"18\" ry=\"22\" fill=\"#fef9e7\" stroke=\"#f0b127\" stroke-width=\"2.5\"\/>\n <text x=\"245\" y=\"155\" font-size=\"10\" font-weight=\"600\" fill=\"#7d6608\" text-anchor=\"middle\">Glove<\/text>\n <text x=\"355\" y=\"155\" font-size=\"10\" font-weight=\"600\" fill=\"#7d6608\" text-anchor=\"middle\">Glove<\/text>\n <text x=\"150\" y=\"150\" font-size=\"11\" fill=\"#1c2833\" font-weight=\"600\">Safety Gloves<\/text>\n <!-- Ears -->\n <ellipse cx=\"265\" cy=\"80\" rx=\"8\" ry=\"12\" fill=\"#fef9e7\" stroke=\"#f0b127\" stroke-width=\"2\"\/>\n <ellipse cx=\"335\" cy=\"80\" rx=\"8\" ry=\"12\" fill=\"#fef9e7\" stroke=\"#f0b127\" stroke-width=\"2\"\/>\n <text x=\"200\" y=\"85\" font-size=\"11\" fill=\"#1c2833\">Ear Protection<\/text>\n <!-- Legs -->\n <rect x=\"270\" y=\"200\" width=\"25\" height=\"70\" fill=\"#e8f5ee\" stroke=\"#1a7a4a\" stroke-width=\"2\" rx=\"3\"\/>\n <rect x=\"305\" y=\"200\" width=\"25\" height=\"70\" fill=\"#e8f5ee\" stroke=\"#1a7a4a\" stroke-width=\"2\" rx=\"3\"\/>\n <!-- Feet -->\n <ellipse cx=\"282\" cy=\"275\" rx=\"20\" ry=\"12\" fill=\"#1a7a4a\"\/>\n <ellipse cx=\"318\" cy=\"275\" rx=\"20\" ry=\"12\" fill=\"#1a7a4a\"\/>\n <text x=\"300\" y=\"280\" font-size=\"10\" font-weight=\"700\" fill=\"#fff\" text-anchor=\"middle\">Safety Shoes<\/text>\n <text x=\"370\" y=\"275\" font-size=\"11\" fill=\"#1c2833\" font-weight=\"600\">Safety Boots<\/text>\n <\/svg>\n\n <table class=\"data-table\">\n <thead><tr><th>Equipment<\/th><th>Protects<\/th><th>When to Use<\/th><\/tr><\/thead>\n <tbody>\n <tr><td>Safety Glasses \/ Goggles<\/td><td>Eyes<\/td><td>Always \u2014 especially grinding, drilling<\/td><\/tr>\n <tr><td>Safety Shoes \/ Boots<\/td><td>Feet<\/td><td>All the time in workshop<\/td><\/tr>\n <tr><td>Gloves<\/td><td>Hands<\/td><td>Handling hot or sharp materials<\/td><\/tr>\n <tr><td>Apron \/ Overalls<\/td><td>Body \/ Clothes<\/td><td>During all workshop work<\/td><\/tr>\n <tr><td>Ear Protection<\/td><td>Ears<\/td><td>Near loud machines<\/td><\/tr>\n <tr><td>Face Shield<\/td><td>Whole face<\/td><td>Welding, grinding<\/td><\/tr>\n <tr><td>Hard Hat \/ Helmet<\/td><td>Head<\/td><td>Heavy lifting areas<\/td><\/tr>\n <\/tbody>\n <\/table>\n\n <h3>First Aid in Workshop<\/h3>\n <ul>\n <li><strong>Eye injury:<\/strong> Wash eye with clean water immediately. Do not rub.<\/li>\n <li><strong>Cut:<\/strong> Press a clean cloth on the wound and go to a doctor.<\/li>\n <li><strong>Burn:<\/strong> Put the burned area under cold running water for 10 minutes.<\/li>\n <li><strong>Electric shock:<\/strong> Switch off power first, then help the person \u2014 do NOT touch them while power is on.<\/li>\n <li><strong>Fire:<\/strong> Use fire extinguisher. Shout for help. Leave the building.<\/li>\n <\/ul>\n\n <div class=\"practice\">\ud83d\udcdd <strong>Practice Task:<\/strong> Draw a simple layout of a workshop and label: fitting bench, drilling machine, lathe, fire extinguisher, first aid box, and exit door. Write 5 safety rules in your own words.<\/div>\n <\/div>\n <\/div>\n\n <!-- UNIT 2 -->\n <div class=\"unit\" id=\"unit-2\">\n <div class=\"unit-header\">\n <span class=\"unit-num-badge\">Unit 2<\/span>\n <h2>Measuring & Marking Tools<\/h2>\n <p>Before cutting or shaping, we must measure and mark correctly.<\/p>\n <\/div>\n <div class=\"unit-body\">\n <h3>Why Measurement is Important<\/h3>\n <p>In a workshop, <strong>accurate measurement<\/strong> is very important. If you cut a piece too short or too long, the whole part becomes useless. The saying in workshop is: <em>\"Measure twice, cut once.\"<\/em><\/p>\n\n <h3>Types of Measuring Tools<\/h3>\n <table class=\"data-table\">\n <thead><tr><th>Tool<\/th><th>What it Measures<\/th><th>Accuracy<\/th><\/tr><\/thead>\n <tbody>\n <tr><td>Steel Rule<\/td><td>Length (straight lines)<\/td><td>0.5 mm<\/td><\/tr>\n <tr><td>Vernier Caliper<\/td><td>Length, diameter, depth<\/td><td>0.02 mm<\/td><\/tr>\n <tr><td>Micrometer<\/td><td>Very small thicknesses \/ diameters<\/td><td>0.01 mm<\/td><\/tr>\n <tr><td>Try Square<\/td><td>Right angles (90\u00b0)<\/td><td>Checks squareness<\/td><\/tr>\n <tr><td>Outside Caliper<\/td><td>Outside diameter of round parts<\/td><td>Used with steel rule<\/td><\/tr>\n <tr><td>Inside Caliper<\/td><td>Inside diameter of holes<\/td><td>Used with steel rule<\/td><\/tr>\n <tr><td>Depth Gauge<\/td><td>Depth of holes and slots<\/td><td>0.02 mm<\/td><\/tr>\n <\/tbody>\n <\/table>\n\n <h3>Vernier Caliper \u2014 Reading Steps<\/h3>\n\n <svg width=\"100%\" height=\"200\" viewBox=\"0 0 600 200\" style=\"margin:1rem 0;background:#f8fffe;border-radius:8px;border:2px solid #a2d9b5;\">\n <text x=\"300\" y=\"25\" font-size=\"16\" font-weight=\"700\" fill=\"#145f38\" text-anchor=\"middle\">Vernier Caliper - Main Parts<\/text>\n <!-- Main Scale (fixed jaw) -->\n <rect x=\"80\" y=\"70\" width=\"400\" height=\"25\" fill=\"#e8f5ee\" stroke=\"#1a7a4a\" stroke-width=\"2.5\"\/>\n <text x=\"280\" y=\"88\" font-size=\"13\" font-weight=\"700\" fill=\"#1a7a4a\" text-anchor=\"middle\">Main Scale (mm)<\/text>\n <!-- Main scale markings -->\n <line x1=\"100\" y1=\"70\" x2=\"100\" y2=\"60\" stroke=\"#1c2833\" stroke-width=\"1.5\"\/>\n <line x1=\"150\" y1=\"70\" x2=\"150\" y2=\"60\" stroke=\"#1c2833\" stroke-width=\"1.5\"\/>\n <line x1=\"200\" y1=\"70\" x2=\"200\" y2=\"60\" stroke=\"#1c2833\" stroke-width=\"1.5\"\/>\n <line x1=\"250\" y1=\"70\" x2=\"250\" y2=\"60\" stroke=\"#1c2833\" stroke-width=\"1.5\"\/>\n <line x1=\"300\" y1=\"70\" x2=\"300\" y2=\"60\" stroke=\"#1c2833\" stroke-width=\"1.5\"\/>\n <text x=\"100\" y=\"55\" font-size=\"10\" fill=\"#1c2833\" text-anchor=\"middle\">0<\/text>\n <text x=\"150\" y=\"55\" font-size=\"10\" fill=\"#1c2833\" text-anchor=\"middle\">10<\/text>\n <text x=\"200\" y=\"55\" font-size=\"10\" fill=\"#1c2833\" text-anchor=\"middle\">20<\/text>\n <text x=\"250\" y=\"55\" font-size=\"10\" fill=\"#1c2833\" text-anchor=\"middle\">30<\/text>\n <text x=\"300\" y=\"55\" font-size=\"10\" fill=\"#1c2833\" text-anchor=\"middle\">40<\/text>\n <!-- Vernier Scale (sliding jaw) -->\n <rect x=\"190\" y=\"100\" width=\"150\" height=\"20\" fill=\"#fef9e7\" stroke=\"#f0b127\" stroke-width=\"2.5\"\/>\n <text x=\"265\" y=\"115\" font-size=\"12\" font-weight=\"700\" fill=\"#7d6608\" text-anchor=\"middle\">Vernier Scale<\/text>\n <!-- Vernier markings -->\n <line x1=\"190\" y1=\"120\" x2=\"190\" y2=\"130\" stroke=\"#7d6608\" stroke-width=\"1.5\"\/>\n <line x1=\"210\" y1=\"120\" x2=\"210\" y2=\"130\" stroke=\"#7d6608\" stroke-width=\"1.5\"\/>\n <line x1=\"230\" y1=\"120\" x2=\"230\" y2=\"130\" stroke=\"#7d6608\" stroke-width=\"1.5\"\/>\n <line x1=\"250\" y1=\"120\" x2=\"250\" y2=\"130\" stroke=\"#7d6608\" stroke-width=\"1.5\"\/>\n <text x=\"190\" y=\"142\" font-size=\"9\" fill=\"#7d6608\" text-anchor=\"middle\">0<\/text>\n <text x=\"230\" y=\"142\" font-size=\"9\" fill=\"#7d6608\" text-anchor=\"middle\">5<\/text>\n <!-- Arrow pointing to coinciding line -->\n <polygon points=\"230,150 225,160 235,160\" fill=\"#f0b127\"\/>\n <text x=\"230\" y=\"175\" font-size=\"11\" font-weight=\"600\" fill=\"#f0b127\" text-anchor=\"middle\">Coinciding Line<\/text>\n <!-- Fixed Jaw -->\n <rect x=\"65\" y=\"65\" width=\"15\" height=\"60\" fill=\"#17a589\" stroke=\"#145f38\" stroke-width=\"2\"\/>\n <text x=\"40\" y=\"95\" font-size=\"11\" font-weight=\"600\" fill=\"#1c2833\">Fixed Jaw<\/text>\n <!-- Movable Jaw -->\n <rect x=\"340\" y=\"95\" width=\"15\" height=\"30\" fill=\"#17a589\" stroke=\"#145f38\" stroke-width=\"2\"\/>\n <text x=\"380\" y=\"110\" font-size=\"11\" font-weight=\"600\" fill=\"#1c2833\">Movable Jaw<\/text>\n <!-- Object being measured -->\n <rect x=\"80\" y=\"100\" width=\"260\" height=\"10\" fill=\"#d4efdf\" stroke=\"#566573\" stroke-width=\"1.5\"\/>\n <\/svg>\n\n <ul>\n <li><strong>Step 1:<\/strong> Read the main scale reading (mm) before the 0 of the vernier scale.<\/li>\n <li><strong>Step 2:<\/strong> Find which vernier division lines up exactly with the main scale.<\/li>\n <li><strong>Step 3:<\/strong> Multiply that number by 0.02.<\/li>\n <li><strong>Step 4:<\/strong> Add both readings. That is your answer.<\/li>\n <\/ul>\n <div class=\"info-box\">\ud83d\udccf Example: Main scale = 23 mm, Vernier coincidence = 8th line. Reading = 23 + (8 \u00d7 0.02) = 23 + 0.16 = <strong>23.16 mm<\/strong><\/div>\n\n <h3>Micrometer<\/h3>\n <p>A <strong>micrometer<\/strong> (also called a screw gauge) measures very small sizes very accurately \u2014 up to 0.01 mm. It works by turning a screw. One full turn of the thimble moves it 0.5 mm. It has a sleeve (main scale) and a thimble (small scale).<\/p>\n\n <h3>Marking Tools<\/h3>\n <table class=\"data-table\">\n <thead><tr><th>Tool<\/th><th>Use<\/th><\/tr><\/thead>\n <tbody>\n <tr><td>Scriber<\/td><td>Scratches thin lines on metal surface to mark cutting lines<\/td><\/tr>\n <tr><td>Dot Punch<\/td><td>Makes small dots on the marked line to keep it visible<\/td><\/tr>\n <tr><td>Centre Punch<\/td><td>Makes a deeper mark at the exact centre point for drilling<\/td><\/tr>\n <tr><td>Divider<\/td><td>Marks equal distances or draws circles\/arcs on metal<\/td><\/tr>\n <tr><td>Try Square<\/td><td>Draws perfectly straight 90\u00b0 lines<\/td><\/tr>\n <tr><td>Surface Plate<\/td><td>Flat base used for accurate marking \u2014 always kept clean<\/td><\/tr>\n <\/tbody>\n <\/table>\n\n <h3>Marking Media<\/h3>\n <p>Before marking, the metal surface is coated with a <strong>marking media<\/strong> so the scribed lines are easy to see. Common types: <strong>chalk<\/strong> (for rough work), <strong>engineer's blue \/ Prussian blue<\/strong> (for accurate work on smooth metal), and <strong>white paint<\/strong> (for dark metals).<\/p>\n\n <div class=\"practice\">\ud83d\udcdd <strong>Practice Task:<\/strong> Write the names of any 5 measuring tools, what each one measures, and its accuracy. Also write the steps to read a Vernier Caliper.<\/div>\n <\/div>\n <\/div>\n\n <!-- UNIT 3 -->\n <div class=\"unit\" id=\"unit-3\">\n <div class=\"unit-header\">\n <span class=\"unit-num-badge\">Unit 3<\/span>\n <h2>Bench Work<\/h2>\n <p>Hand operations done at a workbench \u2014 filing, sawing, and chiseling.<\/p>\n <\/div>\n <div class=\"unit-body\">\n <h3>What is Bench Work?<\/h3>\n <p><strong>Bench work<\/strong> means the work done on a workbench using hand tools \u2014 without machines. It includes filing, sawing, chiseling, and scraping. These are some of the most important basic skills every mechanical engineer must learn.<\/p>\n\n <h3>Filing<\/h3>\n <p>A <strong>file<\/strong> is a hard steel tool with many small teeth. It is used to remove extra material from a metal surface to make it smooth and the correct size.<\/p>\n\n <svg width=\"100%\" height=\"200\" viewBox=\"0 0 600 200\" style=\"margin:1rem 0;background:#f8fffe;border-radius:8px;border:2px solid #a2d9b5;\">\n <text x=\"300\" y=\"25\" font-size=\"16\" font-weight=\"700\" fill=\"#145f38\" text-anchor=\"middle\">Common Types of Files<\/text>\n <!-- Flat File -->\n <rect x=\"70\" y=\"50\" width=\"100\" height=\"20\" fill=\"#e8f5ee\" stroke=\"#1a7a4a\" stroke-width=\"2.5\" rx=\"2\"\/>\n <text x=\"120\" y=\"90\" font-size=\"12\" font-weight=\"600\" fill=\"#1c2833\" text-anchor=\"middle\">Flat File<\/text>\n <!-- Round File -->\n <ellipse cx=\"240\" cy=\"60\" rx=\"50\" ry=\"10\" fill=\"#e8f5ee\" stroke=\"#1a7a4a\" stroke-width=\"2.5\"\/>\n <text x=\"240\" y=\"90\" font-size=\"12\" font-weight=\"600\" fill=\"#1c2833\" text-anchor=\"middle\">Round File<\/text>\n <!-- Half-Round File -->\n <path d=\"M 340 70 L 440 70 Q 440 55 390 55 Q 340 55 340 70 Z\" fill=\"#e8f5ee\" stroke=\"#1a7a4a\" stroke-width=\"2.5\"\/>\n <text x=\"390\" y=\"90\" font-size=\"12\" font-weight=\"600\" fill=\"#1c2833\" text-anchor=\"middle\">Half-Round File<\/text>\n <!-- Square File -->\n <rect x=\"495\" y=\"50\" width=\"20\" height=\"20\" fill=\"#e8f5ee\" stroke=\"#1a7a4a\" stroke-width=\"2.5\"\/>\n <text x=\"505\" y=\"90\" font-size=\"12\" font-weight=\"600\" fill=\"#1c2833\" text-anchor=\"middle\">Square File<\/text>\n <!-- Triangular File -->\n <polygon points=\"120,140 90,170 150,170\" fill=\"#e8f5ee\" stroke=\"#1a7a4a\" stroke-width=\"2.5\"\/>\n <text x=\"120\" y=\"190\" font-size=\"12\" font-weight=\"600\" fill=\"#1c2833\" text-anchor=\"middle\">Triangular File<\/text>\n <!-- Needle File (small) -->\n <rect x=\"235\" y=\"145\" width=\"60\" height=\"8\" fill=\"#e8f5ee\" stroke=\"#1a7a4a\" stroke-width=\"2\"\/>\n <rect x=\"295\" y=\"143\" width=\"20\" height=\"12\" fill=\"#f0b127\" stroke=\"#7d6608\" stroke-width=\"1.5\"\/>\n <text x=\"265\" y=\"190\" font-size=\"12\" font-weight=\"600\" fill=\"#1c2833\" text-anchor=\"middle\">Needle File<\/text>\n <!-- File Cut Grades -->\n <rect x=\"360\" y=\"120\" width=\"200\" height=\"70\" fill=\"#fef9e7\" stroke=\"#f0b127\" stroke-width=\"2\" rx=\"5\"\/>\n <text x=\"460\" y=\"140\" font-size=\"13\" font-weight=\"700\" fill=\"#7d6608\" text-anchor=\"middle\">File Cuts (Grades):<\/text>\n <text x=\"460\" y=\"158\" font-size=\"11\" fill=\"#1c2833\" text-anchor=\"middle\">Rough \u2192 Bastard<\/text>\n <text x=\"460\" y=\"173\" font-size=\"11\" fill=\"#1c2833\" text-anchor=\"middle\">\u2192 Second Cut \u2192 Smooth<\/text>\n <\/svg>\n\n <table class=\"data-table\">\n <thead><tr><th>Type of File<\/th><th>Shape \/ Use<\/th><\/tr><\/thead>\n <tbody>\n <tr><td>Flat File<\/td><td>Flat shape \u2014 for flat surfaces (most common)<\/td><\/tr>\n <tr><td>Round File<\/td><td>Round shape \u2014 for enlarging round holes<\/td><\/tr>\n <tr><td>Half-Round File<\/td><td>Flat on one side, curved on other \u2014 for curves and flats<\/td><\/tr>\n <tr><td>Square File<\/td><td>Square shape \u2014 for square holes and slots<\/td><\/tr>\n <tr><td>Triangular File<\/td><td>Triangle shape \u2014 for corners and v-grooves<\/td><\/tr>\n <tr><td>Needle File<\/td><td>Very small and thin \u2014 for fine, detailed work<\/td><\/tr>\n <\/tbody>\n <\/table>\n <p><strong>File cuts (grades):<\/strong> Rough (removes most material) \u2192 Bastard \u2192 Second Cut \u2192 Smooth (gives fine finish)<\/p>\n\n <h3>Hacksawing<\/h3>\n <p>A <strong>hacksaw<\/strong> is used to cut metal. It has a metal frame and a removable blade with teeth. The blade is fitted with teeth pointing forward \u2014 cutting happens on the forward stroke only (push stroke).<\/p>\n <ul>\n <li>Hold the hacksaw with both hands \u2014 one on the handle, one on the front frame.<\/li>\n <li>Use full blade length on each stroke for better cutting.<\/li>\n <li>Apply pressure on the forward stroke only \u2014 lift slightly on the return stroke.<\/li>\n <li>For thin material: use a blade with more teeth per inch (finer blade).<\/li>\n <li>For soft\/thick material: use a blade with fewer teeth (coarser blade).<\/li>\n <\/ul>\n\n <h3>Chiseling<\/h3>\n <p>A <strong>chisel<\/strong> is used with a hammer to cut or chip away metal. It is made of hardened steel.<\/p>\n <table class=\"data-table\">\n <thead><tr><th>Type of Chisel<\/th><th>Use<\/th><\/tr><\/thead>\n <tbody>\n <tr><td>Flat Chisel<\/td><td>Cutting flat surfaces, removing metal layers<\/td><\/tr>\n <tr><td>Cross-Cut Chisel<\/td><td>Cutting grooves or channels<\/td><\/tr>\n <tr><td>Round-Nose Chisel<\/td><td>Making round grooves (oil grooves in bearings)<\/td><\/tr>\n <tr><td>Diamond-Point Chisel<\/td><td>Making v-grooves and sharp corners<\/td><\/tr>\n <\/tbody>\n <\/table>\n <div class=\"info-box\">\u26a0\ufe0f Always hold the chisel firmly, keep your eye on the chisel tip (not the hammer), and wear safety glasses \u2014 metal chips can fly into your eyes.<\/div>\n\n <h3>Vise (Vice)<\/h3>\n <p>A <strong>bench vise<\/strong> is used to hold the metal workpiece tightly while you file, saw, or chisel it. It is bolted to the workbench. The jaws grip the metal when you tighten the handle. Always use soft jaw covers (aluminium or copper pads) on the jaws when holding finished parts so they do not get scratched.<\/p>\n\n <div class=\"practice\">\ud83d\udcdd <strong>Practice Task:<\/strong> Name and draw 4 types of files. Write the correct procedure for using a hacksaw, including how to fit the blade and which stroke cuts the metal.<\/div>\n <\/div>\n <\/div>\n\n <!-- UNIT 4 -->\n <div class=\"unit\" id=\"unit-4\">\n <div class=\"unit-header\">\n <span class=\"unit-num-badge\">Unit 4<\/span>\n <h2>Drilling Operations<\/h2>\n <p>Making holes in metal using a drill bit and drilling machine.<\/p>\n <\/div>\n <div class=\"unit-body\">\n <h3>What is Drilling?<\/h3>\n <p><strong>Drilling<\/strong> is the process of making a round hole in a material using a rotating cutting tool called a <strong>drill bit<\/strong>. It is one of the most common operations in any workshop.<\/p>\n\n <h3>Types of Drilling Machines<\/h3>\n <div class=\"concept-grid\">\n <div class=\"concept-card\"><div class=\"concept-name\">\ud83d\udd29 Portable Drill<\/div><div class=\"concept-rule\">Hand-held, used where the work cannot be moved<\/div><\/div>\n <div class=\"concept-card\"><div class=\"concept-name\">\ud83d\udccc Bench Drill<\/div><div class=\"concept-rule\">Small machine fixed on a bench, for light work<\/div><\/div>\n <div class=\"concept-card\"><div class=\"concept-name\">\ud83c\udfd7\ufe0f Pillar Drill<\/div><div class=\"concept-rule\">Floor-standing, larger, for heavier work<\/div><\/div>\n <div class=\"concept-card\"><div class=\"concept-name\">\ud83d\udd04 Radial Drill<\/div><div class=\"concept-rule\">Arm can swing around \u2014 for large, heavy workpieces<\/div><\/div>\n <\/div>\n\n <h3>Parts of a Drilling Machine<\/h3>\n\n <svg width=\"100%\" height=\"360\" viewBox=\"0 0 600 360\" style=\"margin:1rem 0;background:#f8fffe;border-radius:8px;border:2px solid #a2d9b5;\">\n <text x=\"300\" y=\"25\" font-size=\"16\" font-weight=\"700\" fill=\"#145f38\" text-anchor=\"middle\">Pillar Drilling Machine - Main Parts<\/text>\n <!-- Base -->\n <rect x=\"200\" y=\"320\" width=\"200\" height=\"25\" fill=\"#566573\" stroke=\"#1c2833\" stroke-width=\"2\"\/>\n <text x=\"150\" y=\"335\" font-size=\"13\" font-weight=\"700\" fill=\"#1c2833\">Base<\/text>\n <line x1=\"190\" y1=\"333\" x2=\"200\" y2=\"333\" stroke=\"#1c2833\" stroke-width=\"1.5\"\/>\n <!-- Column\/Pillar -->\n <rect x=\"270\" y=\"100\" width=\"60\" height=\"220\" fill=\"#a2d9b5\" stroke=\"#1a7a4a\" stroke-width=\"3\" rx=\"4\"\/>\n <text x=\"215\" y=\"210\" font-size=\"13\" font-weight=\"700\" fill=\"#1c2833\">Column<\/text>\n <line x1=\"260\" y1=\"210\" x2=\"270\" y2=\"210\" stroke=\"#1c2833\" stroke-width=\"1.5\"\/>\n <!-- Table -->\n <rect x=\"220\" y=\"240\" width=\"160\" height=\"15\" fill=\"#e8f5ee\" stroke=\"#1a7a4a\" stroke-width=\"2.5\"\/>\n <text x=\"430\" y=\"250\" font-size=\"13\" font-weight=\"700\" fill=\"#1c2833\">Table (Adjustable)<\/text>\n <line x1=\"380\" y1=\"248\" x2=\"420\" y2=\"248\" stroke=\"#1c2833\" stroke-width=\"1.5\"\/>\n <!-- Motor -->\n <rect x=\"260\" y=\"65\" width=\"80\" height=\"30\" fill=\"#1a7a4a\" stroke=\"#145f38\" stroke-width=\"2\" rx=\"4\"\/>\n <circle cx=\"300\" cy=\"80\" r=\"8\" fill=\"#fff\" stroke=\"#145f38\" stroke-width=\"1.5\"\/>\n <text x=\"215\" y=\"85\" font-size=\"13\" font-weight=\"700\" fill=\"#1c2833\">Motor<\/text>\n <line x1=\"250\" y1=\"80\" x2=\"260\" y2=\"80\" stroke=\"#1c2833\" stroke-width=\"1.5\"\/>\n <!-- Spindle (from motor to chuck) -->\n <rect x=\"295\" y=\"95\" width=\"10\" height=\"45\" fill=\"#17a589\" stroke=\"#145f38\" stroke-width=\"2\"\/>\n <text x=\"240\" y=\"120\" font-size=\"13\" font-weight=\"700\" fill=\"#1c2833\">Spindle<\/text>\n <line x1=\"290\" y1=\"118\" x2=\"295\" y2=\"118\" stroke=\"#1c2833\" stroke-width=\"1.5\"\/>\n <!-- Chuck -->\n <polygon points=\"285,140 315,140 318,155 282,155\" fill=\"#f0b127\" stroke=\"#7d6608\" stroke-width=\"2\"\/>\n <text x=\"240\" y=\"150\" font-size=\"13\" font-weight=\"700\" fill=\"#1c2833\">Chuck<\/text>\n <line x1=\"275\" y1=\"148\" x2=\"282\" y2=\"148\" stroke=\"#1c2833\" stroke-width=\"1.5\"\/>\n <!-- Drill Bit -->\n <rect x=\"298\" y=\"155\" width=\"4\" height=\"35\" fill=\"#566573\" stroke=\"#1c2833\" stroke-width=\"1\"\/>\n <polygon points=\"298,190 302,190 300,198\" fill=\"#566573\"\/>\n <text x=\"330\" y=\"175\" font-size=\"13\" font-weight=\"700\" fill=\"#1c2833\">Drill Bit<\/text>\n <line x1=\"302\" y1=\"173\" x2=\"320\" y2=\"173\" stroke=\"#1c2833\" stroke-width=\"1.5\"\/>\n <!-- Feed Handle -->\n <line x1=\"350\" y1=\"150\" x2=\"390\" y2=\"150\" stroke=\"#1a7a4a\" stroke-width=\"4\"\/>\n <circle cx=\"390\" cy=\"150\" r=\"8\" fill=\"#17a589\" stroke=\"#145f38\" stroke-width=\"2\"\/>\n <text x=\"420\" y=\"155\" font-size=\"13\" font-weight=\"700\" fill=\"#1c2833\">Feed Handle<\/text>\n <line x1=\"398\" y1=\"150\" x2=\"410\" y2=\"150\" stroke=\"#1c2833\" stroke-width=\"1.5\"\/>\n <!-- Workpiece on table -->\n <rect x=\"270\" y=\"225\" width=\"60\" height=\"15\" fill=\"#fef9e7\" stroke=\"#f0b127\" stroke-width=\"2\"\/>\n <text x=\"430\" y=\"235\" font-size=\"12\" fill=\"#566573\">Workpiece<\/text>\n <line x1=\"330\" y1=\"233\" x2=\"420\" y2=\"233\" stroke=\"#566573\" stroke-width=\"1\"\/>\n <!-- Chuck Key indicator -->\n <circle cx=\"385\" cy=\"145\" r=\"3\" fill=\"#f0b127\"\/>\n <text x=\"450\" y=\"175\" font-size=\"10\" fill=\"#566573\">(Remove chuck key<\/text>\n <text x=\"450\" y=\"188\" font-size=\"10\" fill=\"#566573\">before starting!)<\/text>\n <\/svg>\n\n <ul>\n <li><strong>Base<\/strong> \u2014 the bottom support of the machine<\/li>\n <li><strong>Column \/ Pillar<\/strong> \u2014 the vertical post that holds everything<\/li>\n <li><strong>Table<\/strong> \u2014 where the workpiece is placed (can be raised or lowered)<\/li>\n <li><strong>Spindle<\/strong> \u2014 the rotating part that holds the drill bit<\/li>\n <li><strong>Chuck<\/strong> \u2014 grips and holds the drill bit<\/li>\n <li><strong>Chuck Key<\/strong> \u2014 used to tighten or loosen the chuck<\/li>\n <li><strong>Feed Handle<\/strong> \u2014 you push this down to lower the drill into the work<\/li>\n <li><strong>Motor<\/strong> \u2014 gives power to rotate the spindle<\/li>\n <\/ul>\n\n <h3>Types of Drill Bits<\/h3>\n <table class=\"data-table\">\n <thead><tr><th>Drill Bit<\/th><th>Use<\/th><\/tr><\/thead>\n <tbody>\n <tr><td>Twist Drill<\/td><td>Most common \u2014 for making standard round holes<\/td><\/tr>\n <tr><td>Centre Drill<\/td><td>Makes a small starting hole to guide the main drill<\/td><\/tr>\n <tr><td>Countersink Drill<\/td><td>Makes a cone-shaped top to a hole for flat-head screws<\/td><\/tr>\n <tr><td>Counterbore Drill<\/td><td>Enlarges the top of a hole for bolt heads to sit flat<\/td><\/tr>\n <tr><td>Reamer<\/td><td>Finishes a hole to exact size and smooth surface<\/td><\/tr>\n <tr><td>Step Drill<\/td><td>Makes holes of different sizes in one operation<\/td><\/tr>\n <\/tbody>\n <\/table>\n\n <h3>Steps for Safe Drilling<\/h3>\n <ul>\n <li>Mark the centre of the hole with a <strong>centre punch<\/strong> first.<\/li>\n <li>Secure the workpiece firmly in a vise or clamp \u2014 never hold it by hand.<\/li>\n <li>Select the correct drill bit size and tighten it in the chuck with the chuck key.<\/li>\n <li><strong>Remove the chuck key before starting the machine.<\/strong><\/li>\n <li>Start the drill and slowly lower the drill bit onto the marked centre.<\/li>\n <li>Apply light oil (cutting fluid) to cool the drill bit and help it cut better.<\/li>\n <li>Lift the drill bit out regularly to remove chips and prevent overheating.<\/li>\n <\/ul>\n <div class=\"info-box\">\u26a0\ufe0f Never leave the chuck key in the chuck when the machine is running \u2014 it will fly out and can cause serious injury.<\/div>\n\n <div class=\"practice\">\ud83d\udcdd <strong>Practice Task:<\/strong> Name 4 types of drilling machines and say when each one is used. Write 5 safety rules for drilling. What is the difference between a countersink and a counterbore?<\/div>\n <\/div>\n <\/div>\n\n <!-- UNIT 5 -->\n <div class=\"unit\" id=\"unit-5\">\n <div class=\"unit-header\">\n <span class=\"unit-num-badge\">Unit 5<\/span>\n <h2>Lathe Machine<\/h2>\n <p>The most important machine in any workshop \u2014 used to shape round parts.<\/p>\n <\/div>\n <div class=\"unit-body\">\n <h3>What is a Lathe?<\/h3>\n <p>A <strong>lathe<\/strong> is a machine that spins a metal workpiece (job) while a cutting tool removes material from it to produce a desired shape \u2014 usually a cylinder or round part. It is called the <strong>\"mother of all machines\"<\/strong> because many other machines can be made using a lathe.<\/p>\n <div class=\"info-box\">\ud83e\ude80 Imagine spinning clay on a potter's wheel while pressing your hands on it \u2014 a lathe works the same way, but for metal. The metal spins, and a cutting tool shapes it.<\/div>\n\n <h3>Main Parts of a Lathe<\/h3>\n <table class=\"data-table\">\n <thead><tr><th>Part<\/th><th>Function<\/th><\/tr><\/thead>\n <tbody>\n <tr><td>Bed<\/td><td>The main base of the lathe \u2014 everything is mounted on it<\/td><\/tr>\n <tr><td>Headstock<\/td><td>Fixed on the left \u2014 contains the motor and spindle<\/td><\/tr>\n <tr><td>Tailstock<\/td><td>On the right \u2014 can slide and holds a drill or the job's end<\/td><\/tr>\n <tr><td>Carriage<\/td><td>Holds the cutting tool and moves it along the bed<\/td><\/tr>\n <tr><td>Chuck<\/td><td>Holds the workpiece \u2014 grips round or irregular parts<\/td><\/tr>\n <tr><td>Spindle<\/td><td>Rotates the chuck and workpiece<\/td><\/tr>\n <tr><td>Tool Post<\/td><td>Holds the cutting tool in position<\/td><\/tr>\n <tr><td>Apron<\/td><td>Front part of carriage \u2014 has hand wheels to control movement<\/td><\/tr>\n <\/tbody>\n <\/table>\n\n <h3>Types of Lathe Operations<\/h3>\n <div class=\"feature-grid\">\n <div class=\"feature-item\">\ud83d\udd04 Turning \u2014 reducing diameter<\/div>\n <div class=\"feature-item\">\ud83d\udcd0 Facing \u2014 making the end flat<\/div>\n <div class=\"feature-item\">\ud83d\udd73\ufe0f Boring \u2014 enlarging an existing hole<\/div>\n <div class=\"feature-item\">\ud83d\udd29 Threading \u2014 cutting screw threads<\/div>\n <div class=\"feature-item\">\u2702\ufe0f Parting \u2014 cutting off a piece<\/div>\n <div class=\"feature-item\">\ud83d\udccf Taper Turning \u2014 making a cone shape<\/div>\n <div class=\"feature-item\">\ud83e\ude9e Knurling \u2014 making a rough grip surface<\/div>\n <div class=\"feature-item\">\ud83d\udd01 Step Turning \u2014 different diameters on one rod<\/div>\n <\/div>\n\n <h3>Types of Lathe Chucks<\/h3>\n <ul>\n <li><strong>3-Jaw Chuck (Self-Centering)<\/strong> \u2014 all 3 jaws move together automatically. Best for round and hexagonal work. Very quick to use.<\/li>\n <li><strong>4-Jaw Chuck (Independent)<\/strong> \u2014 each jaw moves separately. Used for square, irregular, or off-center work. More accurate but slower to set up.<\/li>\n <li><strong>Face Plate<\/strong> \u2014 flat disc with slots for bolting irregular shaped parts.<\/li>\n <\/ul>\n\n <h3>Lathe Safety Rules<\/h3>\n <ul>\n <li>Always wear safety glasses near the lathe.<\/li>\n <li>Never wear gloves when operating a lathe \u2014 they can get caught in the rotating chuck.<\/li>\n <li>Make sure the workpiece is firmly clamped before starting.<\/li>\n <li>Remove the chuck key before switching on the machine.<\/li>\n <li>Never measure or touch the rotating workpiece.<\/li>\n <li>Use a hook or brush to remove metal chips \u2014 never your hand.<\/li>\n <\/ul>\n\n <div class=\"practice\">\ud83d\udcdd <strong>Practice Task:<\/strong> Draw a simple diagram of a lathe and label any 6 parts. Name 5 operations done on a lathe and describe what each one does. What is the difference between a 3-jaw and 4-jaw chuck?<\/div>\n <\/div>\n <\/div>\n\n <!-- UNIT 6 -->\n <div class=\"unit\" id=\"unit-6\">\n <div class=\"unit-header\">\n <span class=\"unit-num-badge\">Unit 6<\/span>\n <h2>Welding<\/h2>\n <p>Joining two pieces of metal together using heat.<\/p>\n <\/div>\n <div class=\"unit-body\">\n <h3>What is Welding?<\/h3>\n <p><strong>Welding<\/strong> is a process of permanently joining two or more pieces of metal by heating them until they melt and fuse together. A filler material (electrode or filler rod) is usually added to make a strong joint.<\/p>\n <div class=\"info-box\">\ud83d\udd25 Welding is like melting two pieces of ice together \u2014 when they melt at the join point and then freeze again, they become one single piece.<\/div>\n\n <h3>Types of Welding<\/h3>\n <table class=\"data-table\">\n <thead><tr><th>Welding Type<\/th><th>Heat Source<\/th><th>Common Use<\/th><\/tr><\/thead>\n <tbody>\n <tr><td>Arc Welding (SMAW)<\/td><td>Electric arc (electricity)<\/td><td>General fabrication, construction<\/td><\/tr>\n <tr><td>Gas Welding (OAW)<\/td><td>Oxy-Acetylene flame<\/td><td>Thin sheets, repair work, brazing<\/td><\/tr>\n <tr><td>MIG Welding (GMAW)<\/td><td>Electric arc + wire feed<\/td><td>Fast production work, car bodies<\/td><\/tr>\n <tr><td>TIG Welding (GTAW)<\/td><td>Electric arc + tungsten<\/td><td>Stainless steel, aluminium, precision<\/td><\/tr>\n <tr><td>Spot Welding<\/td><td>Electric resistance<\/td><td>Joining thin metal sheets (car doors)<\/td><\/tr>\n <\/tbody>\n <\/table>\n\n <h3>Arc Welding (SMAW) \u2014 Process<\/h3>\n <p>In <strong>arc welding<\/strong>, an electric arc (a spark of electricity) is created between a coated metal electrode and the workpiece. This arc produces very high heat (around 3500\u00b0C) which melts the metal. The coating on the electrode burns and produces a gas cloud that protects the weld from air (oxygen).<\/p>\n <ul>\n <li><strong>Electrode<\/strong> \u2014 the metal stick used in arc welding<\/li>\n <li><strong>Electrode holder<\/strong> \u2014 holds the electrode safely<\/li>\n <li><strong>Earth clamp<\/strong> \u2014 connects the workpiece to the welding machine<\/li>\n <li><strong>Slag<\/strong> \u2014 the hard crust that forms on the weld after cooling \u2014 must be chipped off<\/li>\n <\/ul>\n\n <h3>Types of Welding Joints<\/h3>\n <div class=\"feature-grid\">\n <div class=\"feature-item\">\ud83d\udcd0 Butt Joint \u2014 two pieces end to end<\/div>\n <div class=\"feature-item\">\ud83d\udd32 Lap Joint \u2014 one piece overlaps the other<\/div>\n <div class=\"feature-item\">\ud83d\udccf T-Joint \u2014 one piece at 90\u00b0 to another<\/div>\n <div class=\"feature-item\">\ud83d\udd30 Corner Joint \u2014 two pieces at 90\u00b0 forming a corner<\/div>\n <div class=\"feature-item\">\u271a Edge Joint \u2014 edges of two pieces together<\/div>\n <\/div>\n\n <h3>Common Welding Defects<\/h3>\n <table class=\"data-table\">\n <thead><tr><th>Defect<\/th><th>What it is<\/th><th>Cause<\/th><\/tr><\/thead>\n <tbody>\n <tr><td>Porosity<\/td><td>Small holes (pores) in the weld<\/td><td>Moisture, dirty surface, wrong current<\/td><\/tr>\n <tr><td>Crack<\/td><td>A crack in the weld metal<\/td><td>Too fast cooling, wrong electrode<\/td><\/tr>\n <tr><td>Undercut<\/td><td>A groove cut along the edge of the weld<\/td><td>Too high current, wrong angle<\/td><\/tr>\n <tr><td>Incomplete Fusion<\/td><td>Weld metal did not fuse properly with base metal<\/td><td>Too fast travel speed, low current<\/td><\/tr>\n <tr><td>Spatter<\/td><td>Small drops of metal around the weld<\/td><td>Too high current, damp electrode<\/td><\/tr>\n <\/tbody>\n <\/table>\n\n <h3>Welding Safety<\/h3>\n <ul>\n <li>Always wear a <strong>welding helmet<\/strong> \u2014 the arc is so bright it can permanently damage your eyes.<\/li>\n <li>Wear <strong>leather gloves, apron, and safety shoes<\/strong>.<\/li>\n <li>Weld in a well-ventilated area \u2014 welding fumes are dangerous to breathe.<\/li>\n <li>Never look at the arc without a proper welding helmet.<\/li>\n <li>Keep a fire extinguisher nearby.<\/li>\n <\/ul>\n\n <div class=\"practice\">\ud83d\udcdd <strong>Practice Task:<\/strong> Name 4 types of welding and write the heat source for each. Draw and label 4 types of welding joints. Write 3 common welding defects and their causes.<\/div>\n <\/div>\n <\/div>\n\n <!-- UNIT 7 -->\n <div class=\"unit\" id=\"unit-7\">\n <div class=\"unit-header\">\n <span class=\"unit-num-badge\">Unit 7<\/span>\n <h2>Sheet Metal Work<\/h2>\n <p>Cutting, bending and shaping thin metal sheets to make useful products.<\/p>\n <\/div>\n <div class=\"unit-body\">\n <h3>What is Sheet Metal Work?<\/h3>\n <p><strong>Sheet metal work<\/strong> is the process of cutting, bending, and joining thin metal sheets (usually less than 6 mm thick) to make items like boxes, pipes, ducts, and trays. Common metals used: mild steel, aluminium, copper, and galvanized iron (GI).<\/p>\n\n <h3>Sheet Metal Tools<\/h3>\n <table class=\"data-table\">\n <thead><tr><th>Tool<\/th><th>Use<\/th><\/tr><\/thead>\n <tbody>\n <tr><td>Snips (Tin Snips)<\/td><td>Cutting thin metal sheets by hand (like scissors for metal)<\/td><\/tr>\n <tr><td>Mallet (Wooden Hammer)<\/td><td>Hammering sheet metal without damaging the surface<\/td><\/tr>\n <tr><td>Steel Rule \/ Try Square<\/td><td>Measuring and marking straight lines<\/td><\/tr>\n <tr><td>Scriber<\/td><td>Marking cut lines on the sheet<\/td><\/tr>\n <tr><td>Stakes<\/td><td>Metal anvils of different shapes for bending and forming<\/td><\/tr>\n <tr><td>Folder \/ Bending Machine<\/td><td>Making straight bends quickly and accurately<\/td><\/tr>\n <tr><td>Hand Groover<\/td><td>Forming the groove in a grooved seam joint<\/td><\/tr>\n <tr><td>Rivet Set<\/td><td>Forming rivet heads when joining sheets with rivets<\/td><\/tr>\n <\/tbody>\n <\/table>\n\n <h3>Sheet Metal Operations<\/h3>\n <div class=\"concept-grid\">\n <div class=\"concept-card\"><div class=\"concept-name\">\u2702\ufe0f Cutting<\/div><div class=\"concept-rule\">Using snips, guillotine, or nibbler to cut sheet to shape<\/div><\/div>\n <div class=\"concept-card\"><div class=\"concept-name\">\ud83d\udcd0 Bending<\/div><div class=\"concept-rule\">Folding the sheet at an angle using a bending bar or folder<\/div><\/div>\n <div class=\"concept-card\"><div class=\"concept-name\">\ud83d\udd01 Rolling<\/div><div class=\"concept-rule\">Curving the sheet into a cylinder using rolling machine<\/div><\/div>\n <div class=\"concept-card\"><div class=\"concept-name\">\ud83d\udd28 Stretching<\/div><div class=\"concept-rule\">Hammering to make the sheet thinner and wider<\/div><\/div>\n <div class=\"concept-card\"><div class=\"concept-name\">\ud83e\udea1 Riveting<\/div><div class=\"concept-rule\">Joining two sheets permanently using rivets<\/div><\/div>\n <div class=\"concept-card\"><div class=\"concept-name\">\ud83d\udd17 Seaming<\/div><div class=\"concept-rule\">Folding and interlocking edges to join two sheets<\/div><\/div>\n <\/div>\n\n <h3>Sheet Metal Joints<\/h3>\n <ul>\n <li><strong>Grooved Seam<\/strong> \u2014 the edges of two sheets are folded and locked together \u2014 used for boxes and cans<\/li>\n <li><strong>Lap Seam<\/strong> \u2014 one sheet overlaps the other and is riveted or soldered<\/li>\n <li><strong>Standing Seam<\/strong> \u2014 both edges are folded up and bent together \u2014 used for roofing<\/li>\n <li><strong>Wired Edge<\/strong> \u2014 a wire is rolled inside the edge of a sheet for strength \u2014 used on buckets<\/li>\n <\/ul>\n\n <h3>Common Sheet Metal Products<\/h3>\n <div class=\"feature-grid\">\n <div class=\"feature-item\">\ud83d\udce6 Metal boxes and trays<\/div>\n <div class=\"feature-item\">\ud83e\udea3 Buckets and cans<\/div>\n <div class=\"feature-item\">\ud83c\udf2c\ufe0f Air ducts and funnels<\/div>\n <div class=\"feature-item\">\ud83d\ude97 Car body panels<\/div>\n <div class=\"feature-item\">\ud83c\udfe0 Roofing sheets<\/div>\n <div class=\"feature-item\">\ud83d\udd27 Tool boxes<\/div>\n <\/div>\n\n <div class=\"practice\">\ud83d\udcdd <strong>Practice Task:<\/strong> Name 5 sheet metal tools and explain what each one is used for. Name 3 sheet metal joints and say which one is used for roofing and which for boxes.<\/div>\n <\/div>\n <\/div>\n\n <!-- UNIT 8 -->\n <div class=\"unit\" id=\"unit-8\">\n <div class=\"unit-header\">\n <span class=\"unit-num-badge\">Unit 8<\/span>\n <h2>Fitting & Assembly<\/h2>\n <p>Putting parts together accurately so they fit and work correctly.<\/p>\n <\/div>\n <div class=\"unit-body\">\n <h3>What is Fitting?<\/h3>\n <p><strong>Fitting<\/strong> is the process of making a part to an exact size and shape so that it correctly fits with another part. A <strong>fitter<\/strong> (the worker) uses hand tools and measuring instruments to do this work.<\/p>\n <div class=\"info-box\">\ud83d\udd29 Think of a nut and bolt \u2014 they must fit together perfectly. If the nut hole is too small, the bolt won't go in. If it is too large, the nut will be loose. Getting this \"just right\" fit is the job of fitting.<\/div>\n\n <h3>Types of Fits<\/h3>\n <table class=\"data-table\">\n <thead><tr><th>Type of Fit<\/th><th>Meaning<\/th><th>Example<\/th><\/tr><\/thead>\n <tbody>\n <tr><td>Clearance Fit<\/td><td>Hole is always bigger than the shaft \u2014 there is always a gap (clearance)<\/td><td>Sliding bearings, pistons<\/td><\/tr>\n <tr><td>Interference Fit<\/td><td>Shaft is always bigger than the hole \u2014 must be pressed or forced together<\/td><td>Gear on a shaft, wheel on axle<\/td><\/tr>\n <tr><td>Transition Fit<\/td><td>Sometimes clearance, sometimes interference \u2014 depends on tolerance<\/td><td>Locating pins, coupling sleeves<\/td><\/tr>\n <\/tbody>\n <\/table>\n\n <h3>Tolerance and Allowance<\/h3>\n <ul>\n <li><strong>Tolerance<\/strong> \u2014 the small allowed difference between the maximum and minimum size of a part. Example: a shaft should be 25 mm \u00b1 0.05 mm \u2014 it can be anywhere between 24.95 mm and 25.05 mm.<\/li>\n <li><strong>Allowance<\/strong> \u2014 the planned (intentional) difference between the sizes of two mating parts (hole and shaft).<\/li>\n <li><strong>Limit<\/strong> \u2014 the maximum or minimum allowed size of a part.<\/li>\n <\/ul>\n\n <h3>Fitting Tools<\/h3>\n <div class=\"feature-grid\">\n <div class=\"feature-item\">\ud83d\udd27 Files \u2014 for removing small amounts of material<\/div>\n <div class=\"feature-item\">\ud83d\udccf Vernier Caliper \u2014 for accurate measurement<\/div>\n <div class=\"feature-item\">\ud83d\udcd0 Try Square \u2014 for checking right angles<\/div>\n <div class=\"feature-item\">\ud83d\udd28 Hammer \u2014 for light knocking and assembly<\/div>\n <div class=\"feature-item\">\ud83e\ude9b Screwdrivers \u2014 for screws<\/div>\n <div class=\"feature-item\">\ud83d\udd29 Spanners \/ Wrenches \u2014 for nuts and bolts<\/div>\n <div class=\"feature-item\">\ud83d\udd11 Allen Key \u2014 for socket head cap screws<\/div>\n <div class=\"feature-item\">\ud83e\ude9b Tap and Die \u2014 for cutting screw threads<\/div>\n <\/div>\n\n <h3>Tapping and Threading<\/h3>\n <ul>\n <li><strong>Tapping<\/strong> \u2014 making a screw thread inside a hole using a cutting tool called a <strong>tap<\/strong>. The steps are: drill the correct size hole \u2192 insert tap \u2192 turn clockwise half a turn, then anti-clockwise quarter turn to break chips \u2192 keep going until thread is complete.<\/li>\n <li><strong>Threading \/ Die cutting<\/strong> \u2014 making an outside thread on a round rod using a tool called a <strong>die<\/strong>. The rod must be the correct diameter before threading.<\/li>\n <\/ul>\n\n <div class=\"practice\">\ud83d\udcdd <strong>Practice Task:<\/strong> What is the difference between clearance fit and interference fit? Give a real-world example of each. Explain the steps for tapping a hole in simple words.<\/div>\n <\/div>\n <\/div>\n\n <!-- UNIT 9 -->\n <div class=\"unit\" id=\"unit-9\">\n <div class=\"unit-header\">\n <span class=\"unit-num-badge\">Unit 9<\/span>\n <h2>Fasteners & Threads<\/h2>\n <p>Nuts, bolts, screws, and rivets \u2014 the things that hold everything together.<\/p>\n <\/div>\n <div class=\"unit-body\">\n <h3>What are Fasteners?<\/h3>\n <p><strong>Fasteners<\/strong> are devices used to join two or more parts together. They can be temporary (can be removed later, like bolts and screws) or permanent (cannot be easily removed, like rivets and welding).<\/p>\n\n <h3>Types of Temporary Fasteners<\/h3>\n <table class=\"data-table\">\n <thead><tr><th>Fastener<\/th><th>Description<\/th><th>Use<\/th><\/tr><\/thead>\n <tbody>\n <tr><td>Bolt & Nut<\/td><td>Bolt has no head thread \u2014 used with a nut<\/td><td>Joining parts that need to be removed often<\/td><\/tr>\n <tr><td>Screw<\/td><td>Has a threaded body and a head \u2014 screws into a threaded hole<\/td><td>Joining light parts, panels, covers<\/td><\/tr>\n <tr><td>Stud<\/td><td>Rod with threads on both ends \u2014 no head<\/td><td>Engine cylinder heads, flanges<\/td><\/tr>\n <tr><td>Key<\/td><td>Small piece of metal that fits in slots in shaft and hub<\/td><td>Preventing gears from rotating on shaft<\/td><\/tr>\n <tr><td>Cotter Pin<\/td><td>Split pin \u2014 inserted through a hole to lock things<\/td><td>Locking castle nuts, preventing slipping<\/td><\/tr>\n <\/tbody>\n <\/table>\n\n <h3>Types of Screw Threads<\/h3>\n <table class=\"data-table\">\n <thead><tr><th>Thread Type<\/th><th>Cross-Section<\/th><th>Use<\/th><\/tr><\/thead>\n <tbody>\n <tr><td>V-Thread (Unified \/ Metric)<\/td><td>V shape<\/td><td>General fastening \u2014 most common<\/td><\/tr>\n <tr><td>Square Thread<\/td><td>Square shape<\/td><td>Power transmission \u2014 lead screws, jack screws<\/td><\/tr>\n <tr><td>Acme Thread<\/td><td>Trapezoidal (29\u00b0)<\/td><td>Lathe lead screws, vises<\/td><\/tr>\n <tr><td>Buttress Thread<\/td><td>One side flat, one side angled<\/td><td>Where force is in one direction only \u2014 presses<\/td><\/tr>\n <tr><td>Knuckle Thread<\/td><td>Rounded V<\/td><td>Where dirt or damage is common \u2014 rail couplings<\/td><\/tr>\n <\/tbody>\n <\/table>\n\n <h3>Thread Terms<\/h3>\n <ul>\n <li><strong>Pitch<\/strong> \u2014 the distance between two thread peaks (in mm)<\/li>\n <li><strong>Lead<\/strong> \u2014 how far the nut or bolt moves in one full turn<\/li>\n <li><strong>Major Diameter<\/strong> \u2014 the largest diameter of the thread<\/li>\n <li><strong>Minor Diameter<\/strong> \u2014 the smallest diameter of the thread (at the root)<\/li>\n <li><strong>TPI (Threads Per Inch)<\/strong> \u2014 used in the inch system<\/li>\n <\/ul>\n\n <h3>Rivets \u2014 Permanent Fasteners<\/h3>\n <p>A <strong>rivet<\/strong> is a permanent fastener \u2014 once it is fitted, it cannot be removed without destroying it. It is a short metal pin with a head on one end. The other end is hammered (or pressed) to form a second head, locking the joint.<\/p>\n <div class=\"feature-grid\">\n <div class=\"feature-item\">\ud83d\udd18 Snap Head Rivet \u2014 most common, rounded head<\/div>\n <div class=\"feature-item\">\ud83d\udcd0 Countersunk Rivet \u2014 flat head, smooth surface<\/div>\n <div class=\"feature-item\">\ud83d\udd32 Pan Head Rivet \u2014 wide flat head<\/div>\n <div class=\"feature-item\">\ud83d\udd29 Hollow Rivet (Pop Rivet) \u2014 used with rivet gun<\/div>\n <\/div>\n\n <h3>Locking Devices (Preventing Nuts from Loosening)<\/h3>\n <ul>\n <li><strong>Lock Nut<\/strong> \u2014 a second nut tightened against the first<\/li>\n <li><strong>Spring Washer<\/strong> \u2014 a split washer that grips and prevents loosening<\/li>\n <li><strong>Castle Nut + Cotter Pin<\/strong> \u2014 nut has slots, pin goes through to lock it<\/li>\n <li><strong>Locking Wire<\/strong> \u2014 wire threaded through bolt heads to prevent rotation<\/li>\n <\/ul>\n\n <div class=\"practice\">\ud83d\udcdd <strong>Practice Task:<\/strong> What is the difference between a bolt and a screw? Name 3 types of screw threads and say which one is used for power transmission. Name 3 locking devices and explain why they are needed.<\/div>\n <\/div>\n <\/div>\n\n <!-- UNIT 10 -->\n <div class=\"unit\" id=\"unit-10\">\n <div class=\"unit-header\">\n <span class=\"unit-num-badge\">Unit 10<\/span>\n <h2>Heat Treatment of Metals<\/h2>\n <p>Changing metal properties by heating and cooling in different ways.<\/p>\n <\/div>\n <div class=\"unit-body\">\n <h3>What is Heat Treatment?<\/h3>\n <p><strong>Heat treatment<\/strong> is the process of heating a metal to a specific temperature and then cooling it in a specific way to change its properties \u2014 making it harder, softer, stronger, or more flexible.<\/p>\n <div class=\"info-box\">\ud83c\udf73 Just like cooking an egg changes it (raw \u2192 hard-boiled), heating and cooling metal in different ways changes its properties. You can make steel hard as glass or soft as clay \u2014 depending on how you heat and cool it.<\/div>\n\n <h3>Heat Treatment Processes<\/h3>\n <table class=\"data-table\">\n <thead><tr><th>Process<\/th><th>What is Done<\/th><th>Result<\/th><\/tr><\/thead>\n <tbody>\n <tr><td>Annealing<\/td><td>Heat to high temp \u2192 cool very slowly (in furnace)<\/td><td>Makes metal soft, easy to machine and work<\/td><\/tr>\n <tr><td>Normalizing<\/td><td>Heat to high temp \u2192 cool in still air<\/td><td>Relieves internal stress, improves toughness<\/td><\/tr>\n <tr><td>Hardening<\/td><td>Heat to high temp \u2192 cool very quickly (quench in water or oil)<\/td><td>Makes metal very hard (but brittle)<\/td><\/tr>\n <tr><td>Tempering<\/td><td>Done after hardening \u2014 reheat to lower temp \u2192 cool in air<\/td><td>Reduces brittleness, gives toughness<\/td><\/tr>\n <tr><td>Case Hardening<\/td><td>Hard outer shell + soft inner core \u2014 carbon is added to surface then hardened<\/td><td>Hard outside (wear resistance), tough inside<\/td><\/tr>\n <\/tbody>\n <\/table>\n\n <h3>Quenching Media (Cooling Liquids)<\/h3>\n <ul>\n <li><strong>Water<\/strong> \u2014 very fast cooling, gives maximum hardness \u2014 used for plain carbon steel<\/li>\n <li><strong>Oil<\/strong> \u2014 slower cooling than water \u2014 less distortion\/cracking \u2014 used for alloy steel<\/li>\n <li><strong>Air<\/strong> \u2014 slowest cooling \u2014 used for normalizing<\/li>\n <li><strong>Brine (Salt Water)<\/strong> \u2014 faster than plain water \u2014 used for special steels<\/li>\n <\/ul>\n\n <h3>Why Tempering is Done After Hardening?<\/h3>\n <p>After hardening, steel becomes very hard but also very <strong>brittle<\/strong> (it breaks easily like glass). <strong>Tempering<\/strong> is done to reduce this brittleness while keeping most of the hardness. The colour of the surface during tempering tells the temperature: straw (220\u00b0C) \u2192 light blue (290\u00b0C) \u2192 blue-black (320\u00b0C).<\/p>\n\n <h3>Case Hardening \u2014 Method<\/h3>\n <ul>\n <li><strong>Carburizing<\/strong> \u2014 steel part is packed in carbon-rich material and heated \u2014 carbon enters the surface<\/li>\n <li><strong>Nitriding<\/strong> \u2014 steel is heated in nitrogen gas \u2014 nitrogen enters the surface to harden it<\/li>\n <li>Result: hard outer skin (5\u201315 mm) + tough\/soft core \u2014 perfect for gears, cams, shafts<\/li>\n <\/ul>\n\n <div class=\"practice\">\ud83d\udcdd <strong>Practice Task:<\/strong> What is the difference between annealing and normalizing? Why is tempering done after hardening? Name 3 quenching media and say which gives the fastest cooling.<\/div>\n <\/div>\n <\/div>\n\n <!-- UNIT 11 -->\n <div class=\"unit\" id=\"unit-11\">\n <div class=\"unit-header\">\n <span class=\"unit-num-badge\">Unit 11<\/span>\n <h2>Pattern Making<\/h2>\n <p>Making a model (pattern) to create a mould for casting metal parts.<\/p>\n <\/div>\n <div class=\"unit-body\">\n <h3>What is a Pattern?<\/h3>\n <p>A <strong>pattern<\/strong> is a model or replica of the final product. It is used to make a mould in sand. Liquid metal is then poured into the mould. When the metal cools and solidifies, it takes the shape of the pattern. The process of making parts this way is called <strong>casting<\/strong>.<\/p>\n <div class=\"info-box\">\ud83e\uddc1 A pattern is like a cake mould \u2014 you use the mould to shape the batter, bake it, and remove the mould. You are left with a cake in the exact shape of the mould. A pattern works the same way for metal casting.<\/div>\n\n <h3>Pattern Materials<\/h3>\n <table class=\"data-table\">\n <thead><tr><th>Material<\/th><th>When Used<\/th><th>Advantage<\/th><\/tr><\/thead>\n <tbody>\n <tr><td>Wood (teak, pine)<\/td><td>Small quantities, low-cost patterns<\/td><td>Cheap, easy to shape<\/td><\/tr>\n <tr><td>Aluminium<\/td><td>Medium production runs<\/td><td>Light, does not rust, easy to machine<\/td><\/tr>\n <tr><td>Cast Iron<\/td><td>Large production runs<\/td><td>Hard, long-lasting, precise<\/td><\/tr>\n <tr><td>Wax<\/td><td>Investment (lost wax) casting<\/td><td>Melts out easily, very precise<\/td><\/tr>\n <tr><td>Plaster of Paris<\/td><td>Prototype patterns<\/td><td>Cheap, quick to make<\/td><\/tr>\n <\/tbody>\n <\/table>\n\n <h3>Types of Patterns<\/h3>\n <div class=\"concept-grid\">\n <div class=\"concept-card\"><div class=\"concept-name\">\ud83d\udce6 Solid Pattern<\/div><div class=\"concept-rule\">One single piece \u2014 simple shape, cheap, used for basic parts<\/div><\/div>\n <div class=\"concept-card\"><div class=\"concept-name\">\u2702\ufe0f Split Pattern<\/div><div class=\"concept-rule\">Two halves \u2014 for complex shapes that cannot be removed as one piece<\/div><\/div>\n <div class=\"concept-card\"><div class=\"concept-name\">\ud83d\udd32 Match Plate Pattern<\/div><div class=\"concept-rule\">Both halves mounted on a plate \u2014 used for mass production, very accurate<\/div><\/div>\n <div class=\"concept-card\"><div class=\"concept-name\">\ud83d\udd29 Loose Piece Pattern<\/div><div class=\"concept-rule\">Has removable loose parts for undercuts \u2014 complicated but allows complex shapes<\/div><\/div>\n <div class=\"concept-card\"><div class=\"concept-name\">\ud83d\udd2e Shell Pattern<\/div><div class=\"concept-rule\">Hollow pattern \u2014 lighter and cheaper for large patterns<\/div><\/div>\n <\/div>\n\n <h3>Pattern Allowances<\/h3>\n <p>A pattern is always made <strong>slightly larger<\/strong> than the final part because of these allowances:<\/p>\n <ul>\n <li><strong>Shrinkage Allowance<\/strong> \u2014 metal shrinks (gets smaller) as it cools. The pattern is made bigger to compensate. Example: cast iron shrinks about 10 mm per metre.<\/li>\n <li><strong>Draft Allowance (Taper)<\/strong> \u2014 sides of the pattern are given a slight taper (angle) so the pattern can be easily removed from the sand mould without breaking it.<\/li>\n <li><strong>Machining Allowance<\/strong> \u2014 extra material added on surfaces that will be machined later to the final smooth finish.<\/li>\n <li><strong>Distortion Allowance<\/strong> \u2014 for parts that are expected to bend or warp during cooling \u2014 the pattern is made with an opposite curve.<\/li>\n <\/ul>\n\n <div class=\"practice\">\ud83d\udcdd <strong>Practice Task:<\/strong> What is the difference between a solid pattern and a split pattern? Name 4 pattern allowances and explain why each one is needed. Which pattern material is used for large production runs?<\/div>\n <\/div>\n <\/div>\n\n <!-- UNIT 12 -->\n <div class=\"unit\" id=\"unit-12\">\n <div class=\"unit-header\">\n <span class=\"unit-num-badge\">Unit 12 \u00b7 Final<\/span>\n <h2>Workshop Project & Quick Revision<\/h2>\n <p>Practical project guidelines and a full course summary for revision.<\/p>\n <\/div>\n <div class=\"unit-body\">\n <h3>Workshop Project Guidelines<\/h3>\n <p>At the end of the Workshop Technology course, you will complete a <strong>practical project<\/strong>. You will use the skills learned in this course to make a real metal part. Follow these steps:<\/p>\n <ul>\n <li><strong>Step 1 \u2014 Choose a Job:<\/strong> Select a simple project like a metal tray, bracket, T-square, or step block.<\/li>\n <li><strong>Step 2 \u2014 Make a Drawing:<\/strong> Draw the part with all dimensions (Engineering Drawing rules).<\/li>\n <li><strong>Step 3 \u2014 Select Material:<\/strong> Mild steel is best for beginners.<\/li>\n <li><strong>Step 4 \u2014 Mark Out:<\/strong> Use scriber, square, and divider to mark all dimensions on the metal.<\/li>\n <li><strong>Step 5 \u2014 Cut to Size:<\/strong> Use hacksaw to cut the material close to the marked lines.<\/li>\n <li><strong>Step 6 \u2014 File to Finish:<\/strong> File all surfaces to the exact size and check with Vernier caliper.<\/li>\n <li><strong>Step 7 \u2014 Drill if Needed:<\/strong> Mark centre points, punch, and drill any holes.<\/li>\n <li><strong>Step 8 \u2014 Finish:<\/strong> Deburr all edges, clean the surface, apply paint or oil.<\/li>\n <\/ul>\n\n <h3>Workshop Technology \u2014 Complete Course Summary<\/h3>\n <table class=\"data-table\">\n <thead><tr><th>#<\/th><th>Unit<\/th><th>Key Point<\/th><\/tr><\/thead>\n <tbody>\n <tr><td>1<\/td><td>Introduction & Safety<\/td><td>Always wear PPE \u2014 glasses, shoes, gloves, apron<\/td><\/tr>\n <tr><td>2<\/td><td>Measuring Tools<\/td><td>Vernier = 0.02 mm accuracy; Micrometer = 0.01 mm<\/td><\/tr>\n <tr><td>3<\/td><td>Bench Work<\/td><td>Filing, Sawing (push stroke only), Chiseling<\/td><\/tr>\n <tr><td>4<\/td><td>Drilling<\/td><td>Always centre punch first; remove chuck key before starting<\/td><\/tr>\n <tr><td>5<\/td><td>Lathe Machine<\/td><td>\"Mother of all machines\" \u2014 turning, facing, threading, boring<\/td><\/tr>\n <tr><td>6<\/td><td>Welding<\/td><td>Arc welding uses electric arc; always wear welding helmet<\/td><\/tr>\n <tr><td>7<\/td><td>Sheet Metal Work<\/td><td>Cutting, bending, rolling, riveting thin metal sheets<\/td><\/tr>\n <tr><td>8<\/td><td>Fitting & Assembly<\/td><td>Clearance \/ Interference \/ Transition fits; tapping creates internal thread<\/td><\/tr>\n <tr><td>9<\/td><td>Fasteners & Threads<\/td><td>Bolts, screws, rivets; V-thread most common; square thread for power<\/td><\/tr>\n <tr><td>10<\/td><td>Heat Treatment<\/td><td>Anneal=soften; Harden=quench; Temper=reduce brittleness<\/td><\/tr>\n <tr><td>11<\/td><td>Pattern Making<\/td><td>Pattern is bigger than final part \u2014 shrinkage, draft, machining allowances<\/td><\/tr>\n <tr><td>12<\/td><td>Project & Revision<\/td><td>Mark \u2192 Cut \u2192 File \u2192 Drill \u2192 Finish<\/td><\/tr>\n <\/tbody>\n <\/table>\n\n <div class=\"practice\">\ud83d\udcdd <strong>Final Project Task:<\/strong> Make a small metal bracket from mild steel. The bracket should have one flat base (50mm \u00d7 50mm) and one vertical part (50mm \u00d7 30mm) at 90\u00b0. Drill one 8mm hole in each part. File all surfaces smooth and check dimensions with a Vernier caliper.<\/div>\n <\/div>\n <\/div>\n\n <div class=\"congrats\">\n <h2>\ud83c\udf89 Congratulations!<\/h2>\n <p>You have completed Workshop Technology (122). You now know about tools, machines, welding, fitting, and more. 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