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Unread 09-01-2013, 19:32
nathan_hui nathan_hui is offline
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AKA: Nathan Hui
FRC #2473 (CHS Robotics)
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Re: Direct drive with CIM?

Take a look at McMaster and Ruland

www.mcmaster.com
www.ruland.com

If you've got a lathe and you have a full set of drill bits (letter, number, and fractional), consider making your own. A #21 drill bit should be a good fit for a 4mm shaft (4mm is .15748, #21 is .159)

You may have to settle for some misalignment in the shafts, since you may have to approximate one dimension or the other. If so, take a look at Ruland's couplings that allow shaft misalignment (last three on the front page)

EDIT: 8mm? use a O drill bit (.316). 8mm is .314961
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Nathan Hui
B.S. Electrical Engineering, UCSD '16
FRC 2473 (CHS Robotics), Team Captain '12
FTC 4950, 6038

Last edited by nathan_hui : 09-01-2013 at 19:51.