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Unread 14-05-2015, 18:46
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Re: pic: Manually machinable one-speed gearbox

Quote:
Originally Posted by Jack S. View Post
If you wanted to run a 6WD Texas Tube without moving your bearing holes off of the rail's center line, you could try running your center wheel on an 18t sprocket and your outer wheels on 17t sprockets inside 0.1" wall 2"x1". If I've run the numbers correctly, you should be able to put 4" wheels in the center and shaved down 3.8" wheels on the outer shafts to achieve equal linear speeds. However, that would only result in a 0.1" drop.
That's an interesting idea for sure. Main problem I see with it really is that 2 18T VexPro COTS sprockets can't fit inside 2x1. It would require either the custom machining of a double 18t sprocket or shaving down the COTS 18t sprockets. (unless there's a thinner double 18t sprocket on the market that I'm unaware of)

A .1" drop should be plenty, at least by my observations. I've seen teams run 3/32 without a problem.

A nicer way to do it might be to run 17t sprockets on the center wheel and 16t on the corners. You also get almost exactly an 1/8" drop then. But at that point, you might as well run all 17t sprockets with drop center, since that gets more teeth meshing with chain.
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