I think Mcmaster -Carr rounds of the 5 tpi to the nearest 64th. I don't think the 13/64 is the actual lead, from what I've heard. I'd check that out first to see if it helps.
The Xylotex is probably a little small for that size machine, but if you're going slow enough you should be OK. What Feed speed we're you running at?
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Gerry
Mach3 2010 Screenset
http://home.comcast.net/~cncwoodworker/2010.html
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