Homebrew PCBs

Find a suitable-size/torque "400 Hz. 3-phase motor".  Re-do the  "output end" 
with a suitable precision angular-contact ball-bearing rated for  30,000 RPM, 
and install a tiny collet-chuck.  This takes some machining  skill and 
experience.
 
Wire up a 400 Hz inverter.  This will require either a LUCKY source of  the 
needed transformer, or the ability to "roll your own" for the specific  
application.
 
The 400 Hz. "instrument motor" I found at my local "surplus outlet" is a  
quasi-3-phase design which requires 400 Hz. single-phase plus a specific  
capacitor/resistor to provide a "third leg".  A one-of-a-kind application,  but it 
works!  Spins 24000 RPM and drills FR-4 nicely.  
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