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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