I actually used the lathe and the mill
on this one.

hard drive disks and bearings (actually,
the whole thing spins on the stepper motor
that ran the HD) Also, hard drive
case.

I machined a case for the whole thing
out of aluminum. approx 1/64" clearance
between discs and case.

The nozzle is a hack... I just drilled
a hole in the side.

I get 12V 4amps with 80PSI, pulling power
off the stepper motor :-)

Rich