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Machine Drawing by N. D. Junnarkar

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Chapter 3

Projections

Image

 

This chapter contains basic information about projections and methods of projection with illustrated sketches

After reading this chapter you will be able to

  • differentiate orthographic, isometric, oblique, and perspective drawing
  • identify first angle and third angle orthographic projections
3.1 PROJECTIONS

For the purpose of construction, a drawing should show the true shapes of all parts of an object together with their sizes. Orthographic projection is universally adopted for this purpose. By this method, the description of the object regarding its shape and size is conveyed in definite and unmistakable terms so that ...

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