Thread: A message from REV Robotics
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Unread 09-16-2015, 08:45 AM
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Re: A message from REV Robotics
Quote:
Originally Posted by Greg Needel View Post
The decision to go with 8mm hex was actually a long and complex one. I am happy to share our thinking.
  • Compatibility with existing parts - Most teams that compete in FTC use and have Tetrix parts. All Tetrix wheels and gears have an 8mm round hole in them and then you use adapters to connect them to either 6mm (motors) or 4.7mm shafts. Since an 8mm round shaft will pilot inside an 8mm hex it makes it easy for teams to use their existing adapters, shafts, gears, and wheels in conjunction with our system. Additionally if teams want, they can get an 8mm hex broach and convert their old parts without a problem.

Greg
I don't see the detailed specs for REV's 8mm hex -- maybe I have not looked hard enough yet?

Anyway, a quick search indicates that 5/16" (0.3135" finished dimension) hex broaches are available from popular distributors MSC Direct and McMaster-Carr at about one-third the price of an 8mm (0.3154" finished dimension) hex broach. About $130 for 5/16" vs. about $400 for 8mm.

What is the actual size of REV's 8mm hex shaft? Will 5/16" work?
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