pic: FP Gearbox (KOP Gears - 2)

[R.C.]

Originally Posted by Brandon Holley

We eventually added a 2nd gear parallel to the gear the motor pinion is touching to keep the 2 FP motors from stripping gear teeth off of that gear. We turned the extra hub off of one to fit it in there, it ended up being the difference maker and kept the gearbox running all year w/o any problems.

Brandon, That is a great idea. I think we will end up doing the same.

Originally Posted by squirrel

neat! I'm curious why you used hex bore bearings, just turn the ends of the shafts round instead....that's how we made our single stage FP gearbox and it worked fine. easy to make, we had the bearings laying around already

Funny thing, our whole bot used hex bearings and I think we had over 100 bearings laying around along with over a bajillion bushings. So we have the option of .5 bore, .375 bore, .375 hex bore. So I figured I could be lazy and just use .375 hex all the way.

Originally Posted by Ivan Helmrich

I can't tell from the photo, did you remember to make slots or holes for the air to circulate through the motor? I also can't tell if the pinion is making full engagement with the gear. It looks like the engagement is at the very end of the pinion. A thinner side plate (or a recess in the current one) will move that closer to the motor's bearing and make life easier on the motor shaft.

I'm guessing the use of the hex bearings eliminated the need for any lathe work. That's a nice option for teams without access to a lathe.

How are you locating the hex shaft axially?

This was before we added the holes for the air, I relized from another CAD drawing I had that I didn't add the holes for circulation. The pinion fully engages when you tighten the gearbox.

Thanks for the help,

-RC