Machine Drawing

148 Machine Drawing

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d:\N-Design\Des9-1.pm5 Seventh Print

60

X

X

f

170

25

15

f

260

X–X

8 25 258

10

R35 5

ROPE, DIA 20^70

f

70

f

60

f

30

10

45°

Fig. 9.7 Rope pulley

THEORY QUESTIONS

9.1 What is the use of a pulley?

9.2 How are pulleys mounted on shafts?

9.3 Name different types of pulleys?

9.4 What is “crowning” and where and why it is applied?

9.5 When is a flat belt pulley recommended?

9.6 What are the various types of flat belt pulleys?

9.7 What is the difference between an armed pulley and a pulley with a web?

9.8 What is meant by fast and loose pulleys? Explain its working principle.

9.9 What is the difference between a flat belt and a V-belt?

9.10 What are the various types of V-belt pulleys?

9.11 Where and why a step cone pulley is used?

9.12 Where do you recommend a rope drive?

9.13 Differentiate between a V-belt drive and a rope drive.

9.14 What are the materials used for the ropes?

DRAWING EXERCISES

9.1 Sketch the following types of flat belt pulleys, providing necessary views; with proportionate

dimensions marked: