Production Drawings 395
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d:\N-Design\Des20-1.pm5
Fig. 20.6THEORY QUESTIONS
20.1 What is production or working drawing of a component?
20.2 What information must be provided on production drawing of a machine to facilitate its manufac-
ture and assembly.
20.3 Why working drawings must be prepared as per the standards?
20.4 Classify and describe the various types of working drawings.
20.5 What is a working assembly drawing?
20.6 What kind of drawings are to be prepared for producing, (a) forged component, and (b) cast
component.DRAWING EXERCISES
20.1 Prepare working drawings of the following components of the split sheave eccentric, shown in
Fig. 19.7.
(a) Sheave piece (1)
(b) Sheave piece (2), and
(c) Strap (7).
Indicate the fits and tolerances recommended for the above components.
20.2 Make the working drawings of the components of the angle plummer block, shown in Fig. 19.21.
Indicate suitable fits and the corresponding tolerances for the parts: (a) Brasses and base, (b)
Brasses and the shaft (not shown).
20.3 Study the lathe speed gear box shown in Fig. 19.10a and make a working drawing of the spindle.
Indicate the tolerances, surface finish, etc., wherever necessary.
20.4 Study the milling machine tail-stock shown in Fig. 19.11 and prepare the production drawings of,
(a) body (1), (b) centre (2), and (c) screw (4). Indicate the fits and the corresponding tolerances on
the body and centre. Write down the process sheet for making the body.