RE: [CAD_CAM_EDM_DRO] Rebuilt 3HP Perske on eBay, was: Cheap 56K rpm upgrade

Looks like n older model - don't know how the bearings would perform over
24,000 rpm.

Dave

-----Original Message-----
From: CAD_CAM_EDM_DRO@yahoogroups.com
[mailto:CAD_CAM_EDM_DRO@yahoogroups.com] On Behalf Of Jon Elson
Sent: 24 April 2005 04:21
To: CAD_CAM_EDM_DRO@yahoogroups.com
Subject: Re: [CAD_CAM_EDM_DRO] Rebuilt 3HP Perske on eBay, was: Cheap 56K
rpm upgrade


JanRwl@... wrote:

>Don't forget, if you want this spindle, you must have a 300-400 Hz
>3-phase source of power for it! I did a Perske machine in '85, and the
>motor-generator cost MUCH more than the spindle it powered! Fine noisy

stuff, though!

>
>

If it is 3-phase, you can run it off a modern VFD that goes that high in
frequency.
You generally need series inductors (reactors in that trade) for the VFD to
run properly. A number of VFDs can now go to 400 Hz, which will get you
24,000 RPM. If you want 54,000 RPM you need about 950 Hz.
AC Tech makes a special model that will go to 1000 Hz.

Jon



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