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Unread 23-03-2012, 03:35
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AllenGregoryIV AllenGregoryIV is offline
Engineering Coach
AKA: Allen "JAG" Gregory
FRC #3847 (Spectrum)
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Re: Bridge device failure fix

Quote:
Originally Posted by beiju View Post
Our team had that in our first regional, but we still weren't able to lower the bridge. I assume it's lack of torque in our drive train, but I want to get other opinions.

We're using 6-wheel drive, with KOP Traction wheels in the center and omni-wheels for the other four. Each side is driven by one CIM (which I think is our problem) into a CIMple box, and the chains are all 1:1 ratios. Another problem was that a last-minute shooter design change forced us to move the arm to the side, and we couldn't afford the weight of a second arm (connected so as to not violate the one appendage rule) on the other side. We plan to fix both of those problems for our next regional, and I hope that will allow us to easily lower the bridge.
Are the chains really 1:1 from the CIMple box? With 6" wheels that's geared for about 25 ft/sec, that is very fast and with only 1 CIM per side that is a very small amount or torque. The kit drive train reduces 12 to 26 out of the CIMple box and that provides a bit more torque. My team goes 12 to 36 with two CIMs per side to make sure we have enough torque.
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