Homebrew PCBs

One of the primary considerations of a tool is that it uses collets.  Any chuck like a Jacobs introduces a few thou of runout.  I'd like to find a set of collets for my old Unimat, but they are hard to come by at anything resembling a reasonable price.  

I have a relatively new Dremel in a drawer.  I'll compare it's runout to my Foredom 40 hand piece.  It just may be better for PCB drilling.  

As for positioning the holes, an XY table with 50 TPI lead screws makes things go quickly.

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