FF gear pressure angle

[chuck colburn]

I feel kinda stupid having to ask this since I repaired and built cine optics for thirty years, but I can't find solid info on the pressure angle of the 32 pitch follow focus, zoom and iris gears used on motion picture camera lenses.
Some people say 14-1/2 degree and some say 20 degree. Any one know for sure?

Thanks,

Chuck

[CVB]

Chuck, all of the gears I've made have been 20 degrees.. they work great.

[chuck colburn]

Chuck, all of the gears I've made have been 20 degrees.. they work great.

Thank you CVB.

Are you only designing a wireless ff? Or both a mechanical and wireless?

Chuck