Machine Drawing

240 Machine Drawing

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d:\N-Design\Des15-2.pm5

15.10 Indicate two methods of showing the top surface of the component as the datum (Fig. 15.23).

Fig. 15.23

15.11 By means of neat sketches and explanatory notes, interpret the meaning of the geometrical

tolerances shown in Fig. 15.24.

^ 0.1 B

B

(a)

.01A

.01A

A

(b)

D

0.02

0.01

.003

.005

A

B

0.01

.003

A

A

B

D

D

D

D

l

.003 (c)

Fig. 15.24

15.12 Complete the tolerance frames in Fig. 15.25 to satisfy the conditions required in each case:

(a) the axis of the whole component is required to be contained in a cylindrical zone of 0.04 mm

diameter.

(b) the top surface has to be parallel to the hole, within a tolerance of 0.08 mm.

(a) (b)

Fig. 15.25