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Re: Internal Threads
For a demo project in 2005 and later to build the competition robot for 2006, 931 used PEM-type 1/4-20 press-in nuts. Several boxes of them. I got them from McMaster. You can see several instances here.
Tip: use a good sharp drill, or better yet, a good punch to make the holes in the sheet stock. Leave the hole edges sharp (i.e., don't deburr) because the press-in nuts clinch to the sheet by distressing those edges.
__________________
Richard Wallace
Mentor since 2011 for FRC 3620 Average Joes (St. Joseph, Michigan)
Mentor 2002-10 for FRC 931 Perpetual Chaos (St. Louis, Missouri)
 since 2003
I believe in intuition and inspiration. Imagination is more important than knowledge. For knowledge is limited, whereas imagination embraces the entire world, stimulating progress, giving birth to evolution. It is, strictly speaking, a real factor in scientific research.
(Cosmic Religion : With Other Opinions and Aphorisms (1931) by Albert Einstein, p. 97)
Last edited by Richard Wallace : 23-08-2012 at 05:18.
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