Re: Running a BOSS on single phase

While my Bridgeport table is a bit jury rigged (runs on linear rails
instead of dovetails), I cam push the steppers to drive it at over
200 ipm without losing steps (don't however, I keep it at about 100
ipm for rapids). Steppers are Sigma NEMA 42's vintage 1970's. I run
at 72 volts, 3.5 amps, 1/2 winding. Using two API CMD-260 drives and
one Gecko 201.

Hope this helps.

Jeff

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "Polaraligned"
<polaraligned@o...> wrote:

>
>
> >
> > Can anyone confirm the 54 volt limit on a boss stepper system?

If

> > the modern 70 volt gecko PWM drive has a problem driving the

stepper

> > to full power, the old boss stepper system must have been

pathetic.

> >
> >
> > Wally
>
> It is really tempting to keep and use the steppers that are already
> set up. I just can't get a straight up answer from the archives
> as to how well it may perform. A bunch of people were only able
> to get 60 or maybe 80 ipm rapids before reliability went down the
> toilet. I wonder how well a modern NEMA 42 stepper would work
> in comparison to the original 25+ year old steppers. The technology
> put into them must have changed sifnificantly since then. If I buy
> stepper drivers
> to use with the factory motors, then I am comitted to steppers.
> What does a modern NEMA 42 go for these days? and are they better
> than the original ones? These are questions I need to figure out
> before comitting to steppers.
>
> Maybe servos are the safest bet. Many frown on them because they
> think they cost more, but there are servos available on e-bay that

are

> pretty inexpensive ($250 or less per axis with encoders)
>
>
> Scott