2012 Fisher Price motors with GEM gearbox

[Ninja_Bait]

Originally Posted by Chris is me

If you want to use an FP with the GEM gearbox, you'd need to use the CIM-SIM or the AM Planetary to "convert" the gearbox output to a CIM.

This is certainly a valid method, but not useful if you don't want to convert your FP to a CIM, i.e. you want to use the GEM directly with the speeds and torques that the FP normally outputs, not something geared to replicate a CIM.

Originally Posted by Chris is me

The AM Planetary output is the CIM input size. Since the AM Planetary has the same ratio, why wouldn't you use that?

Same ratio as what? If you wanted to use the 3.67:1 ratio of a GEM 500 gearbox with an FP, it wouldn't be very helpful to put an AM Planetary in between (now you have ~10:1 ratio).