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 ΒΌ" 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 haven't checked air consumption - just never thought of it. I have a 5
HP shop compressor and if the grinder is the only tool running, the
compressor cycles once every couple of minutes. I'll try to get a better
idea of air consumption later this week or next.
As I mentioned, I'm not using them yet for PCB milling yet. My buddy Ryan
has his system running great and I use his instead of finishing mine. I'll
get to mine one of these weekends!
dwayne
--
Dwayne Reid <
dwayner@...>
Trinity Electronics Systems Ltd Edmonton, AB, CANADA
(780) 489-3199 voice (780) 487-6397 fax
Celebrating 18 years of Engineering Innovation (1984 - 2002)
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