Re: using a stepper motor for spindle on a lathe - Baldor spindle motor

The specs from Baldor say it is a DC motor and the rpm 1750 is listed
independently from the control box. I do need to use it in a servo
mode so the spindle can function as a 4th axis

Keith

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "caudlet" <thom@t...> wrote:
>
> --- In CAD_CAM_EDM_DRO@yahoogroups.com, "Keith Clark" <mail@t...> wrote:
> >
> > --- In CAD_CAM_EDM_DRO@yahoogroups.com, "Bob Muse" <mtebob1@s...>
wrote:
> > >
> > > Hi Keith
> > >
> > > What is the horsepower of the existing motor?
> > >
> > > Bob
> >
> > Baldor 3HP DC 1750rpm motor. Tt has a controller from Electric
> > Regulator Corp labelled a solid state adjustable speed box.
> >
> Hummm. 1750 sure sounds like a AC motor spec. If you say its a DC
> motor then that RPM must be at a given voltage. The speed adjustment
> box may have a method to use an external analog voltage to control the
> motor speed. If not you can replace the motor control box with one
> that does.
>
> Using it in servo mode is possible if you need it for postioning
> control but for simple speed control it would be overkill. There are
> DC motor controls that will keep it within 10% of a set speed using
> Back EMF as well as let you set the target speed via a 0-10V analog
> signal. Several solutions to provide a 0-10 speed signal from MACH3
> are available.
>