In message <89cc4e6005080506024f0ff998@mail.gmail.com>
          Tarun Grover <tarun.grover@gmail.com> wrote:

> I use a Dremel type rotary tool, and usually run the spindle at a
> setting between 4 and 6 (it has adjustments from off to 6(35000rpm)).=20
> The PCB mill I have access to at University has a spindle speed of
> 20000rpm and does a fine job of drilling/cutting through PCBs.

That sounds about right - I've tried mine at 15,000RPM and 33,000RPM. At =
33k
the drill bit produces rather oversized holes. At 15k it produces holes t=
hat
are about the right size.

I'm using a Dremel 285JB in a Wolfcraft drill stand (actually quite a goo=
d
stand, but it takes a bit of work to assemble). Seems to work fairly well=
;
certainly better than my last drill (an Expo Reliant - the chuck isn't
mounted on the motor shaft very well, so it's got a lot of runout - naff =
all
use for PCB drilling).

The bits are regrounds I bought from Jan-Erik Soderholm - some made by Ty=
com,
others by Kemmer-Pr=E4zision. Quite nice bits - certainly better than mos=
t,
even though they're regrounds that I've used to drill a good few hundred
holes.

Thanks.
--=20
Phil.                              | Acorn RiscPC600 SA220 64MB+6GB 100ba=
seT
philpem@philpem.me.uk              | Athlon64 3200+ A8VDeluxe R2 512MB+10=
0GB
http://www.philpem.me.uk/          | Sony MZ-N710 NetMD Minidisc
... Contentsoftaglinemaysettleduringshipping.
--=20
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