Re: Re: Timing belt pulleys -- manufacture

Hi Bill!

If I weren't a "math" person, I'd use the published dim's to make my
part(s). If I need a tooth count between the mfr. available sizes,
I'd "split the difference" or "look for the correlation", again using
the published O.D. and P.D. You will then be "derive-ing" the calcs!
You may not get it EXACTLY right, but I'd bet it would work
well "enough". This IS math, but without all that "nasty" SIN, COS,
TAN stuff... :-)

Hope this helps.

Ballendo

P.S. I'll beat the drum again against the trapezoid XL style teeth
for "driving" applications. The metric (HTD) style is SO much better!!
For "counting" or "registration" apps (encoder driving, for ex.) the
xl might be ok, bit I'd still use the metric (HTx, many mfr.'s now
use the HT, with their own 3rd letter to designate this "parabolic"
tooth style.)

>All the links supplied that I have followed give the dimensions of
>the belts and pulleys, but not the formulas for designing the
>pulleys. I am not enough of a math person, but that know that the
>formulas that we are looking for will have terms like: sin of
>angles, tan of angles, radius, diameters, OD, PD depth of tooth,
>tooth width.
>bill