Homebrew PCBs

In a message dated 8/16/2006 12:55:21 P.M. Central Daylight Time,  
stefan_trethan@... writes:

those  cnc machines use like 30 or 50kRPM.<<
What is the "make", "Excellon" or whatever?  Those have 4  quills which are 
air-motors, which spin routinely at 100,000 RPM, and on up to  300,000 for many 
"tiny" holes!  Visiting a kind and patient PCB house is an  education!







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