Introduction 9
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When new machines or devices are invented, patent drawings come into existence, to illustrate
and explain the invention. These are pictorial drawings and must be self-explanatory. It is
essential that the patent drawings are mechanically correct and include complete illustrations
of every detail of the invention. However, they are not useful for production purposes. The
salient features on the drawing are numbered for identification and complete description.
THEORY QUESTIONS
1.1 Classify the various types of drawings used in mechanical engineering field.
1.2 Explain the term ‘‘Machine drawing’’.
1.3 Define the term ‘‘Production drawing’’.
1.4 Differentiate between machine drawing and production drawing.
1.5 What is an assembly drawing?
1.6 List out the various types of assembly drawings.
1.7 What is meant by a detailed assembly drawing?
1.8 What is a sub-assembly drawing?
1.9 What is an exploded assembly drawing and where is it used?
1.10 Distinguish between the drawings for catalogues and instruction manuals.
1.11 What is meant by a schematic assembly drawing and when is it preferred?
1.12 What is a machine shop drawing and how is it different from machine drawing?
1.13 What are patent drawings and how are they prepared?