pic: One-day Minibot

[Mr V]

Originally Posted by sanddrag

I did exactly that to remove the gear. Did it years ago with FP motors too. I never considered a press plate to push a shaft directly on the gear, without loading the motor shaft. Great idea! I'll have to keep that one in mind.

I was a little worried about pushing the shaft, when it doesn't go all the way through the motor, but it appears to have turned out okay.

There are pinion pullers designed specifically for removing pinions. Pulls it right off easily w/o and damage and only costs a few dollars. However we removed them a couple of different ways w/o any damage to the rest of the motor because we didn't want to wait for the mentor who had the pinion puller at home. The simplest method to do it w/o a pinion puller is to cut a slot slightly wider than the shaft in a plate that is larger than the motor. Then slide the motor on the plate, support the plate with the open jaws of a vise or some blocks and use a small diameter drift to drive the motor out of the pinion. Be sure to have someone ready to catch the motor. Grinding or filing the pinion most of but not all the way to the shaft will allow it to slide off easily also.

No worry about pressing the new "wheel" on the shaft when I did autopsy on motors with broken tabs and burnt inductors I found out that the CE bushing is a ball end type bushing fully supported by the brush plate. So as long as the amount of force is not great enough to bend the motor shaft and you support it on the bushing bump on the brush plate and not the case or terminals the motor shouldn't be damaged.