Did I Do This Right??

[lukevanoort]

You will probably need a larger output sprocket on the transmission to get the speeds you want. Last year, we used the AM single speeds (same ratio as the ToughBoxes) and had to go up to a 21T sprocket from Small Parts on the output to get to ~8ft/s. To get to 15ft/s you would actually need to gear up from the transmission output to the wheel. Something like a 1.73:1 gear up should work for that.

1.73:1 is a decently sized gear up (well, at least for going from the tranny to wheels), so you may want to consider going to larger wheels. If you want to stick with 6" wheels, an aluminum output sprocket is probably in order (a steel one large enough to get that gear-up would be really heavy); unfortunately, aluminum sprockets with 1/2" bores and 1/8" keyways are hard to find (assuming you'd rather not broach your own keyway). To that end I'll leave you with links to two parts that can solve that problem, but how to do it is left as an exercise for the reader (it's not that difficult, you just have to think creatively) Link 1 Link 2.

thanks much Luke

we have a meeting tomorrow morning and I'll show our team these

[MrForbes]

We're removing the second reduction stage in the KOP transmissions, so it is only a 3.57:1 reduction, and adding more reduction on the chain drive.

The change seems to be easy to make, you have to flip over the aluminum plate (to get the right size bearings in the correct place) and punch new holes in it to clear the ends of the CIM shafts, and add a washer next to the roll pin to keep the big gear on the output shaft from moving sideways too much. Looks like a common modification.

[Phyrxes]

Originally Posted by squirrel

We're removing the second reduction stage in the KOP transmissions, so it is only a 3.57:1 reduction, and adding more reduction on the chain drive.

The change seems to be easy to make, you have to flip over the aluminum plate (to get the right size bearings in the correct place) and punch new holes in it to clear the ends of the CIM shafts, and add a washer next to the roll pin to keep the big gear on the output shaft from moving sideways too much. Looks like a common modification.

Interesting idea any chance you have pictures you can post?

[MrForbes]

look at the pictures that 1662 recently posted of their robot, they did this too...

Today we threw our 42 teeth aluminum sprockets on the output shafts and kept the 28's on the wheels. Calculations show that we should get about 14 fps, and that's about what we got in testing today

Thanks for all your help