[Ice Berg]

We actually just did this the other day, so here are some tips. First of all, I would suggest buying a few extra pinion gears, especially if you don't have a lathe, just in case one gets messed up. To get the press fit to work, your hole needs to be very precise. We used this precision reamer, and the diameter worked well:

McMaster part number: 3002A27

Also, in order to bolt the CIM motor onto the gearbox you need to use the slots in the side of the gearbox. However, these have very little clearance. We bought an L allen key (I think 5/32" but I could be wrong), and cut it down to about .5" to get it in the slots.

Also, once you've mounted everything, check the amperage running through the CIM motor mounted to the gearbox. It should be pulling around 3.5 amps, but if it's pulling more, you should check that you cut down the CIM shaft far enough and that the hole you reamed down on the pinion gear is centered.