The Shaft Couplings Class 12 handwritten notes have been prepared for quick Engineering Graphics revision according to the 2026-27 CBSE syllabus. The PDF covers unprotected flange coupling, protected flange coupling, socket-spigot fit, keys, bolts, sectional views and drawing checks.
- Best for: last-minute machine drawing revision before boards.
- PDF includes: 26 handwritten pages with flange-coupling diagrams.
- Focus area: assembly views, disassembly logic, sectioning and dimensions.
These handwritten revision notes follow the official Class XII Engineering Graphics Shaft Couplings chapter and focus on the drawing logic students need while preparing coupling assembly and disassembly sheets.
Student Feedback
In a Collegedunia poll of 11,480 Class 12 Engineering Graphics students, 76% of students said flange-coupling view practice helped them avoid sectioning mistakes before the 2026 boards.
Source: 2026-27 Collegedunia Class 12 Engineering Graphics revision poll.
What Shaft Couplings Class 12 Handwritten Notes Include
The notes begin with the purpose of shaft couplings in machine drawing. They then cover unprotected flange coupling, protected flange coupling, keys, bolt holes, socket-spigot fit and sectional front views.
- Unprotected flange coupling with exposed bolts and nuts.
- Protected flange coupling with a projected shroud.
- Rectangular sunk taper key and shaft keyway.
- Projection symbol, title, scale and important dimensions.
Shaft Coupling Assembly Flow for Class 12 Engineering Graphics
A shaft coupling answer should be drawn in a fixed order. Start with the common shaft axis. Then add shafts, bosses, flanges, keys, bolts, section side and dimensions.
- Keep both shafts on one straight centre line.
- Show bolts on the pitch circle diameter.
- Hatch only the cut solid metal.
- Do not rotate parts during disassembly unless asked.
Protected and Unprotected Flange Coupling Difference
The chapter mainly compares two flange-coupling forms. The unprotected type has exposed bolts. The protected type changes the flange outline so a shroud covers the bolt heads and nuts.
| Type | What to show | Common error |
|---|---|---|
| Unprotected | Exposed bolts and nuts outside the rim | Covering bolts with a shroud |
| Protected | Projected shroud around bolt heads and nuts | Drawing it like ordinary flange coupling |
| Both types | Keys, bosses, shafts and hole P.C.D. | Misplacing key or holes |
Shaft Coupling Assembly Drawing Video for Class 12 Engineering Graphics
Source: Technical Drawing on YouTube
Common Mistakes in Shaft Couplings Machine Drawing
Most mistakes happen after the main outline is correct. Students lose marks when the section side, shroud outline, key position or bolt-hole spacing is wrong.
- Drawing protected coupling without the projected shroud.
- Hatching shaft holes, bolt holes or empty socket space.
- Showing the wrong half in section.
- Forgetting first angle projection symbol, scale or view title.
Other Resources for Shaft Couplings Class 12
| Resource | Use it for |
|---|---|
| Tie-rod and Pipe Joints Handwritten Notes | Revise the previous machine drawing chapter. |
| Machine Drawing Rod Joints Handwritten Notes | Revise cotter, sleeve and gib-cotter joints. |
| Machine Drawing Bearings Handwritten Notes | Revise bearings and bearing drawing views. |
All Chapters Handwritten Notes for Class 12 Engineering Graphics
| Chapter | Handwritten Notes |
|---|---|
| Engineering Graphics Chapter 1 | Isometric Projection of Solids Handwritten Notes |
| Engineering Graphics Chapter 2 | Machine Drawing Bearings Handwritten Notes |
| Engineering Graphics Chapter 3 | Machine Drawing Rod Joints Handwritten Notes |
| Engineering Graphics Chapter 4 | Tie-rod and Pipe Joints Handwritten Notes |
| Engineering Graphics Chapter 5 | Shaft Couplings Handwritten Notes |
Shaft Couplings Class 12 Handwritten Notes FAQs
Ques. What is included in the Shaft Couplings Class 12 handwritten notes?
Ans. The PDF includes unprotected flange coupling, protected flange coupling, shaft keys, socket-spigot fit, sectional views and bolt-hole checks.
Ques. Are protected flange coupling views covered in the PDF?
Ans. Yes. The notes cover shroud shape, front section, side view, hole P.C.D., shaft alignment and common dimension choices.
Ques. Why is unprotected flange coupling important in Engineering Graphics?
Ans. It teaches students how exposed bolts, nuts, keys and flanges are assembled before the protected safety design is introduced.
Ques. How should students revise Shaft Couplings before boards?
Ans. Revise part names first, then practise one unprotected assembly, one protected assembly, one side view and one disassembly question.
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