Homebrew PCBs

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.com
Subject: 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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