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

[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!

[BumblingBuilder]

How much does the entire apparatus weigh? Our team has been experimenting with mechanisms under intense weight constraints, and I'm interested in how much such a wickedly powerful custom gearbox setup such as this weighs.

[Chris Hapstack]

Originally Posted by Fusion_Clint

Nice, I love the design.

I highly suggest steel gears for the final stage, we were using the vexpro gears and broke several teeth during the Bayou Regional which is the reason we were not able to hang during the quarter finals.

Originally Posted by Chris is me

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.

Thanks for bringing up the gear tooth failure issue! If we end up breaking teeth, the plan is to buy some steel replacements from Boston Gear and hex-broach them ourselves. Also, I’m sure the winch could tear itself apart in many different places if it actually tried to lift 1000 pounds.

Originally Posted by BumblingBuilder

How much does the entire apparatus weigh?

The entire winch system here comes to 4.7 pounds (was hoping to get closer to 4, but oh well). That doesn’t include speed controllers, though.

[carpedav000]

Originally Posted by trumpthero786

Looks very well built! I love custom gearboxes like this. I'd also love to see the rachet and pawl. It sounds better than using a socket wrench Thanks for sharing this!

What's wrong with ratcheting wrenches?

[Gabeman6007]

Looking nice. Can't wait to see it in action at the Michigan championship.