Homebrew PCBs

"lilacbarn@... [Homebrew_PCBs]" <Homebrew_PCBs@yahoogroups.com>
writes:
> It is just that the Dremel and its collets are very inaccurate for
> this type of work. Probably great for hand held grinding and the like.

Yeah, common complaint.  For my CNC machine I went with an air
micro-die-grinder instead, much less runout.
http://www.delorie.com/photos/cnc/img_2604.html

But even with the dremel's runout, the only times I broke drill bits was
when I dropped them or did something stupid with them.  I never broke
one by drilling, although getting the hole in the right spot was
sometimes tricky, even with drill helpers.