Actually, I made a tap and tapped a piece of Delrin last night. It worked pretty good. It spun very freely with a little lubricant. Then I noticed this morning, after sitting in the cold all night (55-60°) that it got pretty tight. Now as it warms up again, it's loosening back up, so thermal expansion does seem to play a role.
Gerry
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Gerry
Mach3 2010 Screenset
http://home.comcast.net/~cncwoodworker/2010.html
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