Quote:
Originally Posted by Chris is me
This design should work very well for you. 24 tooth pulleys and 15mm wide belts are basically bulletproof in my experience, and with your welded design you can make the tubing and frame as compact as possible. 2791 has used 24T pulleys and 15mm belts with both 4 and 6" wheels without any ratcheting or belt failure at all. Other teams in our area even used this setup for this year's game, with 8" pneumatic wheels, without any failures. This is a very robust setup and you shouldn't have any issues with it that I can see here.
The only slight design tweak I would suggest would be to switch the bearings out for ThunderHex and 1/2" round. In exchange for a little bit more lathe work on your shafts you can use a 1/2" round bearing on the inside shaft and a ThunderHex bearing on the outside. Round bearings tend to be more robust in WCD setups, and as a small bonus if you design the shaft correctly you can retain the entire shaft using a single snap ring.
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Thanks. What size tubing do you use for your rails? is it 2" tall? If so, what kind of drop are you using and do you run into the issues that Joey mentioned above?
Agreed on the ThunderHex. we ran Thunderhex on our chain-in-tube this year and loved it. I just already had the hex bearings imported into OnShape.