Re: Cheap 56,000RPM milling upgrade (not a dremel :)

> It is a high frequency AC induction motor, but uses air for the

> (both radial
> and thrust) as well as air cooling of the motor. When you turn on

> air, the spindle
> begins to float, and if you flip it with your fingers, it will spin

> minutes.

--- In CAD_CAM_EDM_DRO@yahoogroups.com, Jon Elson <elson@p...> wrote:
> JanRwl@A... wrote:
>
> >In a message dated 4/17/2005 12:59:30 A.M. Central Daylight Time,
> >elson@p... writes:
> >
> >I've got a Westwind air bearing drilling spindle that runs on 80
V @ 400 Hz,
> >or 160 V @ 800 Hz if I had a VFD that would go that high. This
motor uses
> >about 3-4 CFM of air, almost all for cooling the motor.<<
> >So, WHICH is it, high-freq. AC in, or AIR? If both, does the
air "turn"
> >anything, or is that JUST for cooling and swarf-blast?
JRR
> >
> >
> It is a high frequency AC induction motor, but uses air for the
bearings
> (both radial
> and thrust) as well as air cooling of the motor. When you turn on
the
> air, the spindle
> begins to float, and if you flip it with your fingers, it will spin
for
> minutes. There isn't
> a whole lot of swarf, this thing is mostly for drilling tiny holes
in PC
> board material.
> They usually set up a shop vac to vacuum away the dust. The air
escapes
> from the
> top of the motor, where the thrust bearing is.
>
> Jon