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Originally Posted by sanddrag
I believe 968 and 45 did it by carefully using a 10-32 or Metric 5 roll tap to thread the holes in the front. They said you only get a couple threads, but apparently it never failed.
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This is exaclty what we did, and it seemed to work great. Make sure to use a roll tap vs. a regular cutting tap. You do not want the metal shavings to get into the motor. As far as this way being weak, I would have to argue that anything more is not necessary if the gearbox is protected. The gearbox should never see any forces from the side or back (if it does you probably have bigger issues to worry about) Another difference is that we carried the load on the end of the shaft using a bearing, meaning the only way to get the motor off is the pull it out axially and tear the threads off. A hit from the side should be okay, because alot of the force will be distributed through the shaft and into the bearing, making it less likely to put side loads on these threads.
You can see the screws here:
And the bearing block here:
__________________
-Travis Covington
2008-2017 - Engineering Mentor of
Team 254
2001-2008 - Engineering Mentor of
Team 968
1998-2001 - Mechanical Director/Driver/Member of
Team 115