DIYbanter - View Single Post

wrote:

I am still thinking about the dust problem. My thoughts now are to use
a smallish squirrel cage fan and suck the dust into a pleated paper
filter. And build a box around the motor and blow air into the box.
Maybe a blower with two squirrel cage blowers or maybe the filtered
air would be clean enough to use to cool and keep the motor clean.

I think my collet is accurate enough, but the proof will be if I can
drill a # 80 hole. Making a collet from scratch is not cost effective.
If I counted my time as worth anything, it would have been cheaper to
buy a Dremel tool. But I did learn from the experience.

I seriously doubt it! An Excellon drill has a 7 ton granite base, air
bearing
sliders on the X and Y axes, the spindles are mounted to another granite
beam.
The spindles use air bearings, and hold runout to under 0.0001". They
can drill
..012" holes pretty well at 80,000 RPM, but that is about the limit. These
machines go for $200,000 and up. I was pretty amazed I could drill .018"
(about #77) holes with my lash-up of a Westwind spindle on a Bridgeport.
Using a standard VFD, I can only do 24,000 RPM (400 Hz), which is way
too low
for a drill that small. But, that is small enough for anything I'll
ever do. Just
the right size to poke a wire wrap wire through for a via.

Jon