Re: Is this motor workable?

That particular motor has 55 oz-in continuous torque and it is also
6000 RPM. To get the power out of that servo you would need a
minimum of 4-1 or 5.6 -1 reduction. More might be better, but after
5.6-1 the pulleys and belting become a problem. Assuming you have a
5TPI ballscrew 5.6-1 would give you 214 IPM rapids, that's fast. And
you would have 308 oz-in continuous torque, plenty for a mill just
under Bridgeport size.

I think for that kind of money you should keep your eyes open for a
servo with same torque but lower rpm…

The servos Polaraligned found on ebay would be perfect for your mill.
You could probably run them 2-1 or 2.5-1 and have fast rapids.

> Here are the motor specs:
>
> Torque constant: 44oz-in/amp
> Voltage constant: 32.5v/1000 rmp
> Peak torque: 600 oz-in, or 37.5 in-lb
> Nominal voltage: 40vdc
> Maximum voltage: 60vdc
> Demagnitization current: >20amps
> Terminal resistance 2.60 ohm
> Max rpm at 50vdc is about 1200 rpm
> No-load current <.51 amp
> armature inertia .09oz-in-sec^2

Wally

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "vortec62" <fj62@s...> 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.