Re: Futaba Pulscale "CMC" Manual Needed

Mike,

Comments inserted in text below...

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "m_gershowitz"
<mgershowitz@s...> wrote:

> Steve:
>
> Thanks for your feedback and insight. I don't have the machine in
> my garage (yet), but I'm 99% sure these are AC servos, based on the
> photos I took. If there is a way I can upload the photos for you

to

> take a look at???

Sure, you can e-mail them to me direct or send them to the dropbox at
www.metalworking.com (which I also operate).

..... I have a clear shot of the manufacturers

> label (AC Servo Motor, Type SSM-1020F, Shinko Electric Co LTD) and
> good side shot (no brush caps, 2 connectors, one near the center
> (windings?) one on the endcap (encoder?).

Sure sounds like real AC servos. Didn't think these were common in
the 1970's. Live and learn. I did try to learn about the company and
they do seem to still make AC servos. Perhaps you could get luck and
get a response from them.

> Did the AC servo motors
> of the '70s also use true 3-phase? This is my main question,
> because if the system still works fine (have yet to see it powered
> up) then I won't bother changing out the controller, as long as it
> can handle some reasonable G-codes. I'll just invest in a rotary
> converter and leave well enough alone.

Real AC servos, like VFD's, convert the input power into a DC bus
internally. At least that is how modern ones work. Any reasonalble 3
phase rotary converter will work OK for such applications.

Good luck,
Steve Stallings
www.PMDX.com