u/aero_sock

hi guys, im doing a custom modification for the motor and i've been kind of struggling to get the correct measurements of the nylon/steel rotor shaft pair. it seems like 20 degree helical, 1,5 module, 9t/32t, 18mm/53.6mm OD. but it seems there is some profile shift going on, since the outer diameter is supposed to be significantly different from what i measured.

if you have any more precise info on these gears or any cad models related to the motor they would be appreciated