[Rod]

Originally Posted by sanddrag

Rod,
You don't come around these boards too often but when you do I am certainly impressed with your work. You are becoming a great robot designer. Have any of your designs been built? If so, I'd like to see some pictures.

A few notes:
-It might be better to mount the CIMs by the 10-32 threaded holes in their face rather than claming them on the can.
-Why use a coupling on the CIM shafts rather than just putting a gear?
-The transmission directly drives the wheel, I LOVE IT!
-The transmission has three plates, make sure there are never 3 bearings/bushings on a single shaft.
-For the sprockets, what size are they? I would recommend going the smalles you can (which would be 13T for #25 with 1/2" bore)
-Finally, have you considered a welded box tubing frame, they can come out to be very lightweight.

Last, I would like to offer you a picture of our frame in case you wanted to take any design cues from it. http://www.chiefdelphi.com/forums/pi...le&picid=10020 The pillow blocks slide for chain tension. Big tubing is 1.5x2 (probably should have used 1x2 and the small tubing is 1x1. All 1.8" wall.

Again, NICE WORK!

Thanks
A few answers
The gears used are a 55 tooth 3/8 face 20 DP for output and a 5 tooth stem pinion on the end of the Cim motor. The stem pinion has a 3/8" Dia. so it can not be mounted on the Cim shaft. That is why the Cims use a coupling and are not face mounted. I have put 3 bearings on a shaft many times and never had a problem. Our robot this year uses the same gearboxes and works perfect. The sprockets are 14 tooth #35 with 5/8" Bore. This year we had to add weight to our robot (17 Lbs.) We have a 55 Lb. drive train this year, that does not count the arm. So next year if we have a 68 Lb. drive train it should be about right. I read these boards every day, just don't post too much. Our designs have been built, they are posted here both the CAD drawings and this year's Robot. CAD drawings are titled Light weight drive train, we built a slightly modified version of it.
See Ya