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Unread 30-11-2016, 15:13
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Robot Mentor
FRC #2974 (WALT)
Team Role: Mentor
 
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Location: Marietta GA
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Re: set screw identification

From the FTC forum (2015 thread):

Quote:
I just received an email from Pitsco that [one of] their vendor(s) mistakenly shipped collars with metric set screws that would require a 2 mm Allen wrench / "hex key", which is 5.04/64th's of an inch.
Per http://www.tetrixrobotics.com/gettin...ools_guide.pdf, the correctly-manufactured collars require the 1/16" (or 4/64") hex key.
Since the hex socket is 0.016" bigger than the 1/16" hex key, this explains why we are rounding the sockets.

It had also confused me why I had found that they were 4 mm set screws, but another Mentor found that a #6 screw fit perfectly - just luck of the draw.

We will segregate (discard) the metric collars. Pitsco has said they would replace the ones with the wrong set screws.
Most hardware stores have thread gages if you have a loose set scew to test.
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