Posted by BillS on May 25, 2012 at 08:19:57:

In Reply to: Measurement of Chordal thickness for spiral gear posted by tom on May 19, 2012 at 02:56:55:

I had to extract this from code so hope it is correct.

For Pinion:

if miter set:

cthk = Circular Thickness = NCP/2

else:

cthk = function (gear ratio, shaft angle, t_g, dp)

If you know the circular thickness, then

Chordal Thickness =

(t_p/dp) SIN(cthk x dp/t_p)

This doesn't account for spiral angle since it is chordal along pitch circle, so I think if you multiply the result above by COS (spiral angle) That should get the normal chordal thickness.

There are probably variations on getting thickness, so please let us know.