Re: replacing feed screw with a hydraulic cylinder

If I did the conversion right these motors can only develop about 60
in/oz of torque. (6.51 Nm) That won't be enough torque for this
machine as a direct connection, (5 ft/lbs? I doubt it) so it seems I
could use the conedrive reducers (20:1) but will clearly need a
feedback mechanism of some sort since there will be a small backlash
in the reducer. Does that make sense? Or would I be better off
looking for different servos?

Maybe I should just use it the way it is (horrid flashbacks of
maintaining air logic systems) but that'll cause problems with
supplying enough power. I suspect I'll spend quite some time on
inspection, cleanup, evaluation, and perhaps some paint, but I want
to sort out the controls as quickly as is practical. That's probably
measured in months or quarters.

The guys showed up saturday and closed in my carport. In and out
before I even knew they were here, and did a great job on it too.
Very courteous as well. I think they were trying to catch up on the
time they'd lost because of the wheel bearing problem they had so I
tried not to keep them. Anyway, weather permitting, tuesday's the
day. The trailer is beefed up, I built a 10' x 4' skid for it, and
it should be pretty easy going. The winch on the trailer should be a
big help.

--- In CAD_CAM_EDM_DRO@yahoogroups.com, Jon Elson <elson@p...> wrote:
>
>
> blown_mgb_v8 wrote:
>
> >Thanks Ray, I saved your reply for future reference. I also fat
> >fingered my response and lost it, which is a shame, but the
> >condensed version is: Probably servos. More specs are model z/zx
> >610, res L/L 0.38, v/krpm 27.8, 230v, Tp 18.6 Nm, and Ip 63. Not
> >sure what those mean exactly, especially the L/L, Ip and Tp,
> >
> Ip is peak current, Tp is peak torque. You will have a big
problem
> finding affordable
> servo amps that can run these motors up to the peak torque! 230 V
* 63 A
> = 19.4 Hp (peak)!
> 230 V / (27.8 V/krpm) = 8273 RPM. Running a 5 TPI screw at 8273
RPM
> gives 1655 IPM
> feedrates! Yikes! I think you can run these motors on 100 V, or
even
> less, and still have
> plenty of speed.
>
> Jon