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Revision Notes

Machine Drawing — Revision Notes

CBSE · Class 12 · Engineering Graphics

Machine Drawing revision notes for CBSE Class 12 Engineering Graphics: 4 topics in quick points. Part of the CBSE Class 12 Engineering Graphics syllabus.

9 formulas & key relations5 concepts

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A comparison chart illustrating temporary and permanent fasteners, with examples for each type. Temporary fasteners like bolts and nuts can be easily separated, while permanent fasteners like welds an
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Key Topics to Revise

1

Screw Threads and Thread Forms

  • A screw thread is a continuous helical groove cut on a cylindrical surface
  • Threads are classified as external (on bolts) and internal (in nuts)
  • Pitch (P) is the distance between corresponding points on adjacent threads
2

Bolts and Nuts

  • Bolt consists of cylindrical body with threaded end and head
  • Length excludes head thickness
  • Hexagonal head bolt is most common with 30° chamfer
3

Washers and Assembly Drawings

  • Plain washer is circular plate with central hole
  • Provides flat, smooth bearing surface under nuts
  • Prevents cutting into material and allows tighter screwing
4

Rivets and Riveted Joints

  • Rivets are permanent fasteners with head at one end
  • Second head formed during assembly process
  • Snap head rivet is most common type

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Full Notes

Key Concepts

A continuous helical groove cut alongKey terms include pitch (distance betweenStandardized thread forms including BSW (BritishBolts consist of a threaded cylindricalPermanent fastening method using rivets

Frequently Asked Questions

What are the important topics in Machine Drawing for CBSE Class 12 Engineering Graphics?
Key topics in Machine Drawing include Screw Threads and Thread Forms, Bolts and Nuts, Washers and Assembly Drawings, Rivets and Riveted Joints. Study these first, then practise questions on each for the CBSE Class 12 board exam.

Sources & Official References

Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

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All CBSE Class 12 Engineering Graphics Revision Notes

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