1.

What will be step ratio of headstock spindle for a lathe machine of following data?Maximum speed = 2100 rev/minMinimum speed = 70 rev/minNo. of speeds = 21

A. (30)1/9
B. (30)1/20
C. (30)1/21
D. (30)1/22
Answer» C. (30)1/21


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