RE: [CAD_CAM_EDM_DRO] Re: spindle motors

Thank you Wally and Smoke for the reality checks,

The separate high-speed motor approach is making more sense for
the light load, high-speed work. I'm still looking into how much
speed I can get out of the R8 spindle setup. It would be nice to
have the higher speeds (~5k rpm) available for some metal cutting
jobs, where the high-speed motors just don't have enough rigidity.
I've heard of VMC spindles that are good for 5-6k rpm with metal
bearings, and some up to 10k rpm with ceramic bearings. How do
they get away with this?

Carlos Guillermo
VERVE Engineering & Design



-----Original Message-----
From: Wally K [mailto:cnc4me@...]
Sent: Tuesday, December 12, 2000 1:59 PM
To: CAD_CAM_EDM_DRO@egroups.com
Subject: [CAD_CAM_EDM_DRO] Re: spindle motors

I have a feeling your bearings will heat up at these RPM. And i
think you are going about it the wrong way. Engraving, PCB
milling,
and EDM electrode milling are low HP high RPM. 6000 RPM is not
very
fast for these jobs. Jon Elson found a simple soultion to this
problem. He made a simple spindle adapter plate to fit on his
main
spindle and hold a separate small high speed motor. For a picture
of
this go to Jon's air spindle page at this URL.

http://ascc.artsci.wustl.edu/~jmelson/wwspndl.html

He has a write up there that will help you.


The VFD drive is still a good idea but stay away from the 6000
rpm.


Wally K.





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