Question

Pitch of the given bolt is 10 mm. The bolt completed the ½ revolution in the forward direction. How much the bolt advances through axis?

(a) 10 mm

(b) 5 mm

(c) 2.5 mm

(d) 20 mm

The question was posed to me in examination.

My question comes from Construction of Evolutes and Helix in chapter Curves used in Engineering Practice of Engineering Drawing

Answer 1

Correct choice is (b) 5 mm

To explain: The axial advance of the point during one complete revolution is called the pitch of the helix. So here pitch is 10 mm and the point starts upwards from the base of the cylinder, in ½ revolutions, the point will move up to a distance of 5mm from the base.