1.

When a double –threaded screw is made to turn 120 degrees about axis. How much the screw advances through axis?

A. 1⁄3 of pitch of helix
B. 1⁄3 of pitch of screw
C. 1⁄4 of pitch of helix
D. The advancement is equal to pitch of helix.
Answer» B. 1⁄3 of pitch of screw


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