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post #1 of 5 (permalink) Old 06-08-2012, 09:34 AM Thread Starter
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Smile Hello from New Brunswick

Just retired a year ago. Have done leaded stained glass for last 15 years. Got into sandblasting decorative glass pieces as well as marble and stone. Also do high speed (60,000-250,000 rpm) rotary cutting using 1/16 th burrs. Carving in turned bowls that I do on a small lathe and doing decorative work on hunting rifles. Got interested in CNC as a possible way of automating the rough cutting work on the rotary cutting. Currently have a Bosch-Colt trim router for the Probotix V90 I am setting up.
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post #2 of 5 (permalink) Old 06-08-2012, 10:29 AM
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welcome johnan!! btw are you sure 60,000 to 250,000 rpm or just typo error?
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post #3 of 5 (permalink) Old 06-08-2012, 11:04 AM
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That's about 1/2 the speed of a modern dental drill, Kuldeep.
Dental drill - Wikipedia, the free encyclopedia
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post #4 of 5 (permalink) Old 06-08-2012, 11:11 AM
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thanx for sharing info!!
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post #5 of 5 (permalink) Old 06-11-2012, 06:26 AM Thread Starter
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Smile Air turbine grinder/router

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Originally Posted by samurai View Post
welcome johnan!! btw are you sure 60,000 to 250,000 rpm or just typo error?
These air-turbine pencil grinders will do 60,000 rpm at 90 psi using about 1-2 cfm. My smallest unit is the fastest. It is from GRS tools and does 250-300,000 rpm at 40 psi using about 1 cfm.

These turbines use 1/16 carbide burrs, with usually 5 teeth. They are very fast and nothing really stands up to that many blade hits per second. They look like little snowblower when I cut slate stone, with a little plum of dust coming off from the cutter tip. They are driven by an air-turbine, so they don't really have any torque. They are also very low mass, have to be to hit that speed.

They require a gentle touch, but cut amazingly fast when used correctly. One advantage is that if you press a little too hard they simply stall and stop. Lift up the cutter and they spin back up to speed. No burned motors or jammed cables. Great solution for detailed hand carving, but not usable as a regular router because of the low torque. They are about the size of a cigar.

Hope this helps.
John
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