White Paper Discuss: 2 speed, Shift-on-the-fly TechnoKat Gearbox

[Andy Baker]

Originally posted by Matt Reiland
One thing I am not really clear on is the mount of the drill motor. We had to make an aluminum carrier so we could screw into something (Also made a fantastic heatsink too!) , how are yours mounted in the 2003 gearbox? Also love the carrier on the CIM motor, fantastic idea.

Great tranny, ohh so small too.

Matt,

Thanks for the comments.

This points out one thing I forgot to include in the write-up. Mounting the drill motor was not as easy as the prints show. We altered the drill motors a bit in order to make them mountable. Very carefully, we threaded the two holes on the front face of the drill motor for M5x0.8 screws.

In order to thread these holes, we started out with a regular M5x0.8 tap to begin cutting the threads. Then, we switched to a "bottoming tap" (which is the same tap with the end tip grounded off) and finished the threads. We did this in so that the tip of the tap did not hit the motor windings. Also, when we threaded these holes, we used grease on the tap so that any chips would cling to the tap... we did not want chips getting into the windings.

It was kinda tricky, but it worked fine. We did not have any drill motor mounting "issues" once they were installed.

There probably is a better way to do this... 226's way of making a separate piece to hold the drill motor is more of a "for sure" way to go, and I am always for making things better.

Andy B.