Question

A power screw is 30 mm in diameter and has a thread pitch of 5 mm. Find the thread depth, the thread width, the mean and root diameters, and the lead, provided that square threads are used. Assume single threads.

Answer 1

thread depth = 2.5 mm

thread width = 2.5 mm

mean diameter = 27.5 mm

root diameter = 25 mm

lead of screw = 5 mm

Step-by-step explanation:

given data

power screw diameter D = 30 mm

thread pitch P = 5 mm

solution

First, we get here thread depth fr square thread

thread depth =
`(P)/(2)` ......................1

thread depth =
`(5)/(2)`

thread depth = 2.5 mm

and

thread width for square thread

thread width =
`(P)/(2)` ......................2

thread width =
`(5)/(2)`

thread width = 2.5 mm

and

mean diameter is

mean diameter = D -
`(P)/(2)` ................3

mean diameter = 30 -
`(5)/(2)`

mean diameter = 27.5 mm

and

root diameter is

root diameter = D - P ....................4

root diameter = 30 - 5

root diameter = 25 mm

and

lead of screw for single thread so n = 1

so lead of screw = 1 × 5

lead of screw = 5 mm