Homebrew PCBs

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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