I am trying to calculate the centre distance of a worm and worm gear and al
though I have looked lots of formulae on line I am, as usual, confused!
The worm gear has 40 teeth and the OD at the largest point of the gear is 4
.375?.
The worm OD is 1.167? and it is a three start worm, if that is important.

Could somebody explain in words of one syllable how I do this calculation a nd what answer I should get?

I need the easy to understand method of calculation as I know I will need i t again in the not too distant future.

As usual, thanks in advance.

John H

Could somebody explain in words of one syllable how I do this calculation a nd what answer I should get?

I need the easy to understand method of calculation as I know I will need i t again in the not too distant future.

As usual, thanks in advance.

John H