Homebrew PCBs

"Jim Barnes" <jim@...> writes:
> Can someone tell me more details of the problems alluded to with the
> Dremel? Can they be fixed with a little machining to tighten tolerances?

I use a dremel with 0.013" drill bits.  The runout is about 7 mil
(half the drill's width) so getting the bit to hit the right spot on
the pcb is tricky.  Despite that, I don't usually break bits drilling
- they usually die from being dropped on the floor long before that :-P

The runout seems to be just that the collet's hole isn't centered in
the shaft when it's all assembled (don't know why).  The drill bit
wiggles back and forth, even up at the 1/8" thick part.  I tried
packing more grease into the bearings, didn't help - IMHO anything
beyond that is machining.