Gene
I´m from argentina, i working with Bridgeport machine .
My machine work with stepers nema43 (24NM) at 170 v .
Nema 34 dont´t work correct in 80 volt ( current is very low) , and in
dimanic move lost step.
Nema 34 and nema 43 work correcty at 170 v , . if te driver dont´t work in
it. Your machine lost the step.
Eduardo gonzalez.
www.nexanargentina.com.ar
-----Mensaje original-----
De: Jon Elson [mailto:el...@pico-systems.com]
Enviado el: Domingo, 04 de Enero de 2009 08:37 p.m.
Para: Enhanced Machine Controller (EMC)
Asunto: Re: [Emc-users] A wish - Closed Loop Steppers
Roger wrote:
> Gene,
> What I was thinking about was using steppers to reliably power big iron on
the
> Bridgeport scale. Kelinginc.net sells big steppers (nema 34, 1800 oz) for
> $180. If you add an encoder and a G203V 80 volt/20 amp drive you are under
> $400 per axis.
>
Well, if you restrict yourself to lower speeds, this will work. As you
go up in speeds, the torque drops off, and the margin of safety for not
losing steps gets narrower.
> That is a pretty attractive price and makes retrofitting old Faunic based
> machines with their screwy AMP's with resolver feedback instead of tachs a
> whole lot more reasonable. A stepper based conversion would not have the
> performance of a servo system but could still be useful in a home shop.
>
It is almost always easier and cheaper to keep the motors, when you are
getting into larger machine.
If you can find a surplus motor at a real bargain, that may not be
true. For instance, I now have resolver to quadrature converters to
read resolvers.
And, if you are thinking of putting steppers on REALLY big machines, the
12 foot tall Mazaks, Cincinnattis, etc., then really forget it. 150 Lb
steppers do exist, but they are very rare and will go for thousands of
$. The drives will cost even more.
Jon
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