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Consider the following motions and setting in a hobbing machine

1.Hob rotation

2. Job rotation

3.Axial reciprocating job rotation

4. Tilting of hob to its helix angle

Which of these motions and setting in a hobbing machine are required to machine a spur gear?

(a) 1, 2 and 3   (b) 2 , 3 and 4

(c) 1, 2 and 4  (d) 1, 3 and 4

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