NED HELP ON BUILDING 1 OR 2 SPEED GEARBOX

[gburlison]

Originally Posted by EricH

I'd say planetary because it'd be pretty hard to get the reduction from a CIM in ONE stage by means of a spur gear.

This gearbox has a 16 to 1 ratio using 5 tooth stem pinion gears on the CIMs and a 80 tooth spur gear on the output shaft. The use of a stem pinion gear requires a coupler since it is too small to fit on a CIM shaft.

[EricH]

Originally Posted by gburlison

This gearbox has a 16 to 1 ratio using 5 tooth stem pinion gears on the CIMs and a 80 tooth spur gear on the output shaft. The use of a stem pinion gear requires a coupler since it is too small to fit on a CIM shaft.

Makes more sense. Is that one of yours, or did you just analyze it to death?

Edit: Yes, it is 662's 2007 robot. The discussion and original picture are here.
Edit2: Did you guys run into any issues? How much did it cost? What other info would help this team?

[gburlison]

Originally Posted by EricH

Makes more sense. Is that one of yours, or did you just analyze it to death?

Edit: Yes, it is 662's 2007 robot. The discussion and original picture are here.
Edit2: Did you guys run into any issues? How much did it cost? What other info would help this team?

Team2061 sent me a PM and I provided him more details, but the short answer is that it cost about $100. It is a simple one stage gearbox using the smallest stem pinions we could find (5 tooth) and the biggest spur gear practical (80 tooth). There is one main issue with this gearbox and that is alignment. The output shaft is supported in three bearings, so misalignment can cause binding. The first year we built this design, we used solid couplers on the CIMs and this also suffered from misalignment and binding. The Lovejoy Couplers took care of any possible binding of the stem pinion gears. Just for reference, this is our first Gen of this Gearbox. http://www.chiefdelphi.com/media/photos/19829

[Tom Bottiglieri]

My recommendation would be to purchase one of the previously stated boxes. Take it apart, study it, and learn how everything works. Take what you've learned, let it ferment for a few months, then put that knowledge to good use next season designing your own.