Earl,
I own several Dremel MultiPros. I bought a Foredom Number 30
handpiece thinking it was better. If you don't overtighten the collet
of the Dremel it has less runout than the Foredom Number 30. The
Dremel is under .003 and the Foredom is around .006 I suspect the
Jacobs chuck is not as well built as it looks. I bought a sound meter
also. The foredom is only a little quieter than the Dremel. The
Foredom makes low pitch noise and the Dremel is a high pitch. I ran
lots of test during my quest for a quiet spindle. I attached a pulley
to the back of a Foredom handpiece and drove it with a pancake motor.
Almost no noise at 18,000 RPMs but too much runout!
http://crankorgan.com/pancakespindle3.JPG John
--- In
Homebrew_PCBs@yahoogroups.com, "Earl T. Hackett, Jr."
<hacketet@c...> wrote:
> Drilling PCBs is a problem. Right now I'm tending toward using my
Foredom handpiece in a drill press attachment with an XY table. The
boards I'm building are no more than 3" x 5" so a big XY table isn't
required. Foredom tools are very high quality. They use collets
rather than a Jacobs chuck. Runout is minimal and they are designed
for side as well as in line loads. The motor I have has a max speed of
15,000 rpm. That's a bit slow for PCB drilling, but it is primarily a
wood carver. Foredom has pneumatic quills that will run at 300,000
rpm. That's a pretty good clip and should work well in PCB material.
20 years ago the PCB industry was running quills at 120,000 rpm and
looking for more speed. Well, here it is at a price you can afford.
>
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