RE: [CAD_CAM_EDM_DRO] Is this motor workable?

This is good news for me because your calcs agree with mine :)

If I have done it correctly I also get a linear force of 450lbs with 4-1
reduction at the 20A motor torque of 275 oz-in and a conservative guess at
screw efficiency of 30%. I think a ball screw would have a better
efficiency. If I take out the efficiency factor the force is 1500lbs.



-----Original Message-----
From: Jon Elson [mailto:elson@...]
Sent: Friday, February 04, 2005 8:01 PM
To: CAD_CAM_EDM_DRO@yahoogroups.com
Subject: Re: [CAD_CAM_EDM_DRO] Is this motor workable?



vortec62 wrote:

>
>Newbie here. I've been following along but I am still a little lost.
>
>I see lots of discussions about servos/$$$$. I starting to think my
>CNC conversion project will be over budget before I even get
>started...
>
>
>I found this: http://www.servosystems.com/reliance_dcbrush_rdm103.htm
>
>It seems to have similar torque ratings that I have seen mentioned in
>other posts. It has a high speed so could be used with reduction and
>still have acceptable travel speeds(I think).
>
>FYI I have a JET JVM-830 mill that I would like to convert. It is a
>little smaller that a regular bridgeport machine.
>
>

Those prices start looking real good in light of the recent discussion
of $800+
motors! At 20 A, the peak torque you'd get is only 274 Oz-In. But, due to
the high speed, that would still be 1096 Oz-In with a 4:1 reduction. 6000
RPM /4 = 1500 at the screw, and would give 300 IPM rapid feeds with a 5 TPI
screw! They should work fine!

Jon



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