Thread: 971's chassis
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Unread 21-05-2014, 01:12
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switte switte is offline
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AKA: Spencer Witte
FRC #0971 (Spartan Robotics)
Team Role: Mechanical
 
Join Date: Apr 2012
Rookie Year: 2012
Location: Los Altos, CA
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Re: 971's chassis

Quote:
Originally Posted by highlander View Post
Thanks for the quick reply: some follow up questions.

- I'm assuming you guys are using 5052. Confirm/deny?
- Are the tolerances on the laser cutter and the turret punch the same?
- How has your experience been in bending over holes? Do the holes deform and you only use them for access sake? Or is it reliable to allow critical parts to interface with those holes?

Thanks a lot for answering these questions; very very helpful.
We do use 5052 for its ability to bend.

I do not believe that the laser and the turrent punch have the same tolerances. The laser can hit holes within .001 and I believe that the turret pouch will get within ~.005, and Travis and or Austin can correct if I am wrong. We will usually spec out holes on transmissions and whatnot that need to be within laser tolerance and we try to make everything else "punchable".

As for bending near holes, you can deform the hole when it is located near a bend, but in a somewhat predictable way. For holes that don't require major accuracy like our tensioner allen key clearance holes, we are okay placing them near bends, but we try to avoid it when possible. You can also see in the siderail of our drivetrain we put a hole on the inside flange where the transmission goes. While we don't like breaking up the flange, the hole is necessary for our second reduction from out transmission.

slots tend not to deform much when the bend is in the middle of the slot. There have been a few side projects where we do some interesting things with this, but I cannot find any pictures right now...

Hope I have answered your questions

Edit: Darn I was too late

Last edited by switte : 21-05-2014 at 01:16.