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Unread 22-05-2013, 10:17
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Mentor (1114), Alumni (772)
AKA: Aaron Koscielski
FRC #1114 (Simbotics)
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Re: Ball Shifter vs other gearbox

Here's your biggest problem. You are designing your chassis months too early for next season. You need to find out what your ideal speed/speeds will be. Your strategy may not require even going around defense next year, like this year if you were a FCS you didn't have to be really fast, but a cycling robot needed to be really quick.

Next year when you are designing your robot think of the strategy you have come up with. Design you drive train around that, your wheels, speed, and gearboxes should reflect you decisions.

For example I will explain our reasoning behind our speed, wheels and gearboxes this year. First off our wheels, we wamted to have a low profile robot that would rather then running over discs, would push them out of our way. That is why we chose lightweight small 4" IFI Traction wheels. The small wheels also helped with acceleration because you didn't need to move as much weight when moving. Next the speed of our robot needed to be really fast, but then again we needed to have a lot of torque to push around defense. We chose 2 speeds, 14ft/s and 6ft/s. This was achieved by using a 15T sprocket from the gearbox to a 20T sprocket on the wheels. We then had to decide on gearboxes. We wanted light weight, shifting gearboxes, that would achieve our goal speed, thus we chose Ball Shifters. (Keep in mind that the sprocket sizes were selected after the gearbox so we could get that desired speed.)

If you want to use ball shifters you should have a reason for the gearing amd shifting. Otherwise stick with simple gear boxes.
If you need more help feel free to PM me about it.
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