Question

Which of the following is true for the multiple start screw threads?

(a) It is produced by a single helical groove

(b) Grooves should be different in spacing

(c) It gives a quick transverse

(d) It is formed in a transverse section on a cylinder

This question was posed to me in a national level competition.

My question is based upon Screw Threads Terminology topic in portion Metrology of Screw Thread, Gauges for ISO Metric Screw Threads of Engineering Metrology

Answer 1

Right answer is (c) It gives a quick transverse

For explanation I would say: Multiple start screw threads is produced by forming two or more than two helical grooves, equally spaced and similarly formed in an axial section on a cylinder. This gives a ‘quick traverse’ without sacrificing core strength.