Buerste wrote:
What do you have in mind? I need a spindle to spin a 6" cut-off disk to
trim End brushes.

I think you would be disappointed with the results.
Air bearings need very clean dry air to work and
probably wouldn't be happy with the amount of side
load you'd be applying.

"Jon Elson" wrote in message
...
I just picked up a Professional Instruments BlockHead 4R air bearing
spindle assembly. It has an integral motor, resolver, brake and shaft
encoder. It was used in a disk drive development lab, and currently
has a
pneumatically activated clamp for a disk platter mounted on it.
But, looking at the company web site (still in business, the 4R is still
a current model) they use these for precision grinding and other tool
applications, too. It is rated for 10,000 RPM, and has a radial
stiffness of
0.67 Lbs/microinch. I don't know the details of the motor, whether it is
3-phase induction or PM brushless. It appears to be unused, as it still
has the factory shipping lock on the spindle.

This is a big unit, seems to weigh about 40 Lbs. Does anyone have
any use for such an item (before I list it on eBay)?

Jon