pic: Winch-atize me, Cap'n!!

[pilleya]

Originally Posted by Fusion_Clint

Nice, I love the design.

I highly suggest steel gears for the final stage

Unfortunately Andymark does not sell 18 tooth steel gears with a 1/2 inch hex bore.

While the final stage gears might not be able to take the stall torque generated by the 775's, the ratchet means that the motors should never need to be be stalled.

[Chris is me]

Originally Posted by pilleya

Unfortunately Andymark does not sell 18 tooth steel gears with a 1/2 inch hex bore.

While the final stage gears might not be able to take the stall torque generated by the 775's, the ratchet means that the motors should never need to be be stalled.

It's not even just stall torque - it's torque under load, particularly with the long cantilever on the shaft. Pulling your robot up with one of these should work for awhile, but before you know it, you could snap teeth on that pinion gear, fall from the tower, and lose your regional. Happened to me in 2013. Still bitter.

If you could somehow double the face width of that gear (second pinion / output gear) that would help I think. Maybe you'll be okay with this, I dunno.

[Fusion_Clint]

Originally Posted by pilleya

Unfortunately Andymark does not sell 18 tooth steel gears with a 1/2 inch hex bore.

While the final stage gears might not be able to take the stall torque generated by the 775's, the ratchet means that the motors should never need to be be stalled.

They do sell this 19 tooth one, which I bet would also work.

http://www.andymark.com/Gear-p/am-0176.htm

We wound up using one of these paired with a this mecastercarr gear that we machined the bore ourselves. http://www.mcmaster.com/#6325k73/=11up3mm

Just trying to help.

It wasn't our first choice, but is nice not breaking teeth every other match.

[Chris Hapstack]

Originally Posted by Fusion_Clint

Just trying to help.

It wasn't our first choice, but is nice not breaking teeth every other match.

Yeah absolutely, thanks a bunch!