258 Machine Drawing
dharm
d:\N-Design\Des17-1.pm5
1. What is the centre distance between the worm and worm wheel?
2. What is the screw size used to fix the gear shaft in position?
3. What is the thickness of the worm wheel casing?
4. Find the dimensions of A, B, C, D and E, marked in the view from the front.
5. Find the dimensions of F, G and H, marked in the view from the left.
6. What is the approximate overall size of the casing?
7. What is the size of the fillet radius?
R25
R20
G
X
H
(^310)
8 22 12 20 25
f
110 f
48
f
30
f
(^30) f^32 f^50
8
35
35 48
f 20
X
23
17
62
f 12
f 22
55
R12
50
R31
f 90
E
M10
55
40
25
DC
f
22
f
25
f
22
f
40
B
M10
185
35 100
75
(^2522) A 22
F
Fig. 17.5 Worm gear housing
17.3.2 Connector
The working drawing of a connector is shown in Fig. 17.6. Study the drawing and answer the
following:
1. What is the significance of the length of the connector 165 mm, shown within the
brackets?
2. What is the size of the knurled portion of the component?
3. What is the size of the keyweay?
4. Specify the taper.
5. Specify the threads on the component.
6. What is the depth of the drilled hole?
7. What is the counterbore specification at the internal thread opening?
8. What is the purpose of the groove marked ‘X’ and its enlarged view shown?
9. Explain the note 4HOLES, DIA6.
10. Where are the holes drilled?
11. What is the meaning of 4 × 45°?
12. How is the keyway cut?
13. Explain the meaning of the surface finish symbol shown.
