The air grinder at Harbor Freight requires a very large, high cfm rate, compressor. A dentist drill works with small and regular size home compressors and has the higher rpm required by the small drills.
Jeff
-----Original Message-----
From: Boman33 <
boman33@...>
Sent: Tuesday, February 05, 2013 7:41 AM
To:
Homebrew_PCBs@yahoogroups.comSubject: RE: [Homebrew_PCBs] dental handpieces for copper clad drilling
As suggested, the little air powered grinders run about 55,000 RPM and they
only cost about $20 from Harbor Freight.
A lot of years ago I used the turbine from a dental handpiece and diamond
tipped burs to build a microscopic sized custom milling machine to mill the
outside edges of PCB. The PCBs where only 3x3mm (yes, mm) and only 0.2mm
thick. Amazing speed: 350,000 RPM.
Bertho
From: Stefan Trethan Sent: Tuesday, February 05, 2013 03:20
Do you think the dentist drill will have room to accommodate the larger
collet?
They do sell air powered straight grinders that will take 1/8th shanks
and run at pretty high RPM.
ST
P.S.: That always reminds me of a travel documentary I saw about
Pakistan, the presenter went to a dentist on a market there.
The dentist had this drill:
http://www.electronicsweekly.com/blogs/engineering-design-problems/DSCF0003. jpg>
When the presenter asked where he had studied dentistry he said "this
shop belonged to my uncle, and now I am the dentist".
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