How accurate does it have to be? What kind of duty cycle and life between
services? How about necessary horse power?
I use a Bosch Colt Router ($100 apx) to do stuff like this.
Precise Bits (Think and Tinker) has precision 1/4 and 1/8 collets for it,
but a bushing should be adequate for whacking brushes and other things. All
I have to do if I don't crash them is replace brushes every couple hundred
hours. I tend to run it from 24K to 30K, but if I recall the low end is
Here it is in action with my home made mount. (I have two machines setup
That's 30,000 RPM cutting fairly aggressively in aluminum. .07 per pass if
I recall. I admit the motor is most of the noise though. Still, dial it
back and the noise drops dramatically. Since I use it as a CNC spindle in
an enclosure, and usually just watch it from the office on camera the noise
is not an issue for me. Even so, step back five feet and you can easily
hold a conversation.
Alternatively and with a lot more precision a Taig spindle is capable of
10,000 RPM and you can use any motor you want. Their mills typically
come with a 1/4HP brushless motor that is very quiet and should last
indefinitely with very minimal maintenance. A2ZCNC sells the Taig ER 16
Of course there are all those high speed water cooled spindles from
China available on Ebay. I believe that Keling Inc has started stocking
a few upto 2.2Kw here in the US.
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