Re: bridgeport stepper motor specs - help

I have a Bridgeport 2J with a unique table (which gives a bit of an
edge on speed). I have my BP's NEMA 43 motors (no name plate, so I'm
tending to be conservative) wired at half winding. Voltage is 67
volts (still can run over 200ipm, so why go faster). I've set the
current of my drives at about 5 amps for testing(and will probaly go
to 4-4.5 amps for production). Since I'm running at half winding,
the current should be half that used if the motor was parallel wired
(and the same as it would be if series wired). At 5amps the motors
run hot. I can keep my hand on them, but barely. My drives are
fan/heatsink cooled and get warm. It's a half baked way to do
engineering, but seems to work. I think higher current settings,
hile providing a little more torque at a slower speed, might also
reward me with overheated stepper motors.

If Les (or anyone else) knows better (I'm kinda winging this), I
would love to hear their advice.

Jeff


--- In CAD_CAM_EDM_DRO@yahoogroups.com, "metlmunchr"
<metlmunchr@y...> wrote:

> It's been so long since Bridgeport or Hardinge made anything with a
> stepper it's kinda doubtful you'll find any great repository of
> helpful info there, and probably nothing nearly as helpful as the

info

> Les posted. Mine are 8.5A and 58 VDC per the manual. I'm planning

to

> run the Geckos at the full 7A and wire as Les recommends. Mariss

has

> assured us in the past that the necessary safety factors are
> engineered into the Geckos and that they are designed to run at full
> rated voltage and amperage on a long term basis.
>
> Re Hardinge ownership of Bridgeport: That BP survived for so long
> under the ownership of Textron is testimony to what a good product
> they had. Textron bought and killed more than a few companies with
> their conglomerate management style, but BP survived, even though

the

> effects of Textron were noticable. Hardinge Bros has never been

known

> for cutting corners to squeeze another nickel out of a machine.
> Chances are BP will prosper under their ownership.
>
>
> --- In CAD_CAM_EDM_DRO@yahoogroups.com, "theokspindoctor"
> <theokspindoctor@y...> wrote:
> > --- In CAD_CAM_EDM_DRO@yahoogroups.com, JanRwl@A... wrote:
> > > In a message dated 7/19/2004 11:33:22 PM Central Standard Time,
> > > theokspindoctor@y... writes:
> > > cannot find out the
> > > specs in the Bridgeport manual or schematics. Does anyone have
> > any
> > > help for me? or where I can go to find out.
> > > Won't BP help? Seems this would be simple PR!!!!!!!!
> > >
> > >
> > > [Non-text portions of this message have been removed]
> >
> > I wish BP was in business. Hardinge now owns them and we are
> > waiting for someone to call us back... thanks