How do you get the holes in the right place?
I tried using a manual dremel press.
For something like a 40-pin dip header...the pads are tiny
so you have to be right in the center. Also the header won't
fit if any of the tiny holes are the slightest bit off.
I stuck a dremel on a 3-axis stepper assembly. Drills holes
in accurate relative position, but never got around to writing
the code to correct for board rotation in the fixture.
Thank goodness surface mound don't need no stinkin' holes ;-)
mike
--- In Homebrew_PCBs@yahoogroups.com, "crankorgan" <john@k...> wrote:
>
> 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.
> >
> > [Non-text porti
> ons of this message have been removed]