good fences have very fine scales. Imo, it's not too difficult to repeat a position better than .01
If my fence scale was in mm's, then yes, I could get it better than a quarter mm. Probably within a tenth of a mm, provided I'm positioning to even mm's.
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Gerry
Mach3 2010 Screenset
http://home.comcast.net/~cncwoodworker/2010.html
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