Homebrew PCBs

Dwayne Reid wrote:
> 
> At 12:15 AM 5/27/02 -0400, JanRwl@... wrote:
> > > those real inexpensive air power
> > > die grinders sold by Harbor Freight?
> >
> >Dwayne:  Those have a \ufffd" collet, so you would have to "DO something" for
> >PCB-drills, and I don't know what kind of bearings those things have.  MIGHT
> >be OK, at least for a few hundred holes, but no clue.   HOWEVER, I use those
> >as "disposable" when malfunctioning tools to "de-bur" and countersink wood
> >(for FH screws), and they EAT air at a rate with which a 2 hp compressor can
> >hardly keep up!  They also kinda REQUIRE oily air, or, at least oil put into
> >their own intakes from time to time, to keep them properly lubed, and   the
> >resulting oil-mist-spray is NOT good news for a clean and dry
> >to-be-chemically-treated PC-blank!!!!!    But good thinking, anyway!
> 
> Hmm . . . the ones that I have came with a 1/8" collet.  They won't take a
> 1/4" collet - the output shaft is too small.  My 1/8" shaft PC drills fit
> just fine.
> 
> The do require lube but the exhaust comes out the rear of the unit and they
> come with another hose  snapped onto the rear of the grinder.  The exhaust
> goes out that hose - along with any lube mist.

I have a vacuum pump that filters out the oil mist exhaust with a
paper air cleaner. You could try running your exhaust hose into a
cheap auto oil or air filter.