pic: Single Stage Ballshifter

[jkelleyrtp]

Originally Posted by Chris is me

I've tried this concept a few times (putting the shifter shaft in the first reduction), and the problem I consistently run into is that the gear ratios end up way too close together if the CIMs drive the ball shifter gears. I've tried fixing this by having the CIMs drive the ball shifter output and using the shifting gears as pinions for a second stage, but then the gearbox gets HUGE. How have you gotten around these problems?

I'd assume either the shifting spread is going to be 14/11 or they're cutting their own gears to meet the teeth count. I was experimenting with gears around 14 teeth and either your driven needs to be huge (100+ teeth) or you need to have a secondary. Might be able to get away with 6inch wheels to reduce the driven gear, but he's still going to have to make custom cim gears to get anything near 2.5 shifting spread.

Edit: Did not realize a description had been posted. Your teeth count does not line up 71 vs 72, is that okay to use?