Chief Delphi - pic: Single Speed Gearbox Iterations

Quote:

Originally Posted by rcmolloy (Post 1183079)

..., wouldn't it be possible to have a press fit of x OD and .75 ID to fit over the CIM that would allow the possibility to help guide into larger sized holes?

You probably have noticed plastic guides on FP motors in the FRC Kit of Parts. (shown here, for example) They are used in exactly the way you described. Of course as Chris just pointed out, the reason for using a pinion larger than the motor's metal pilot feature is not to enable a larger gear-down ratio. It is to enable a larger pinion pitch diameter. This will reduce the stress at that gear mesh, increasing the service life of the (plastic) gear which mates with the pinion.