Homebrew PCBs

In a message dated 1/18/2003 6:17:44 AM Central Standard Time, 
twb8899@... writes:


> Several types of spindles were available but I used the 60,000 rpm 
> drill/route spindles on the EX-200 and 80,000 drill only spindles on the 
> other machines. The air requirements for these machines was about 20 cfm at 
> 90 psi.

Tom:  

TWO points:  60,000 and 80,000 RPM?  Were these "high frequency" motors, or 
"brush motors"?  TEFC, I would assume!

WOW, 20 CFM at 90 PSI!  That would keep a 10 hp compressor running possibly 
over 50% duty-cycle!  Wouldn't it?

Jan Rowland


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