GENE !!
MOTIONKING have the driver´s (80 TO 220 VCC) and the stepers.
I´m working NEMA 23 with GEKO G210 ON 200 PULSE-REV AT 65 VOLT.
THANKS FOR YOU E-MAIL.
SEE YOU
REGARD
EDUARDO GONZALEZ
-----Mensaje original-----
De: Gene Heskett [mailto:gene.hesk...@gmail.com]
Enviado el: Lunes, 05 de Enero de 2009 01:34 p.m.
Para: nexan_argent...@arnet.com.ar; Enhanced Machine Controller (EMC)
Asunto: Re: [Emc-users] A wish - Closed Loop Steppers
On Monday 05 January 2009, EDU wrote:
>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.
>
Thanks Eduardo. Gee, 170 volt drivers? Now that would be a whole new
ballgame to design. I'm running 23's on 27 volts, and could go as high as
the gecko drives, 80 volts, but I can move fast enough for cutting as is.
Not that my machine is big iron, more like small or teeny even, and a bit
willowy too.
170 volt stuff would need some silicon real estate in separate patches and
would involve the equ of taking the presently used integrated circuit apart,
an Allegro A-3977, and making it out of discreet parts. The hexfets can be
had for over a kilovolt, but the diodes would be problematic, big ones
aren't
fast enough. One might have to resort to sequencing hexfets to look like
synchronous rectifiers.
> www.nexanargentina.com.ar
Nice site, but I should have learned spanish 65 years ago. :)
>-----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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--
Cheers, Gene
"There are four boxes to be used in defense of liberty:
soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
We may not return the affection of those who like us, but we always respect
their good judgement.
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