Re: replacing feed screw with a hydraulic cylinder

> If I did the conversion right these motors can only develop about

> 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

> could use the conedrive reducers (20:1) but will clearly need a
> feedback mechanism of some sort since there will be a small

> 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

> 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

> big help.
>
> --- In CAD_CAM_EDM_DRO@yahoogroups.com, Jon Elson <elson@p...>

> >
> >
> > 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