[sdiy] PCB fab house to make synth panel?

[Bob Weigel]

Hehe.  Yeah that's about the speed of the little microfuge's we used to 
use in the IMB.  More commonly though we used bigger sample capacity 
rotors that would only spin a measly 60 or 80,000 rpm.  hehe.  But... at 
the outer edges of the sample I'm recalling 620,000 g's or like that. 

Can't recall where I shared this a while back but if it was here ignore 
this...but back when the L2-65 Beckman units were starting to have 
questionable capacitors..one failed during a run.  Unfortunately they 
hadn't designed the thing so that it had a separate and more robust 
supply for the speed sensing.  hehe.... so basically by the time the 
vacuum was down to where it would accelerate above 3000rpm roughly... 
this cap was sending out a nice sine wave that overrode the sensor 
signals and continually told the machine it was going 3600rpm.  "Faster 
faster you fool you fool" came the chant from the motor.

The 60Ti rotor therein exploded at about 72000 they figured I think.  
Unfortunately... these things have a fridge can inside the armor plating 
in this washing machine sized thing with a sliding lid that is like 1/2 
- 3/4" steel as I recall in thickness.  When the titanium turned to dust 
and the fridge can was punctured the mixture became...explosive.  The 
lid....I'm not sure where they found the lid but it went through the 
roof of the university.  hehe.  It was in the middle of the night when 
it went off because they had leaky samples that took a long time to 
vacuum down apparently.   Structural damage to the building.  Obviously 
model L2-65B had some improvements in that area :-)  -Bob

David G. Dixon wrote:

>>The drills are spinning at around 130,000RPM using air turbines.
>>    
>>
>
>Thinking about this makes me slightly queasy!
>
>(Still making boards at home, and loving it!)
>
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