Question

For a double threaded screw, what will be the tangent of helix angle if nominal diameter and pitch are 100mm and 12mm respectively?

(a) 0.045

(b) 0.081

(c) 0.094

(d) 0.023

The question was asked by my professor.

I am reviewing the Power Screws Numericals section in Threaded Joints of Machine Design

Answer 1

The accurate option is (b) 0.081

Illuminate the topic with: tan ἀ= l/πd where l=2p, d=D-0.5p.