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The double- threaded screw is made to rotate 2 revolutions for this the screw advances to 40 mm. What is the pitch of helix?

The double- threaded screw is made to rotate 2 revolutions for this the screw advances to 40 mm. What is the pitch of helix? Correct Answer 20 mm

2 revolutions = 40 mm so 1 revolution = 40 mm/ 2 = 20 mm. In any type of screw, the advancement of screw for one revolution is equal to the pitch of the helix. So here also the pitch of helix is 20 mm.

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