Re: [CAD_CAM_EDM_DRO] Servo control from PC

hi bill can you give more information on john elson and his servo drives
please bob morrison

----- Original Message -----
From: "William Scalione" <wscalione@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Saturday, March 29, 2003 9:29 PM
Subject: Re: [CAD_CAM_EDM_DRO] Servo control from PC


>
>
> > Has anyone had any luck running a servo system directly from a pc? I
> > have used numerous PCI cards and they work great, but are expensive.
> > I was wondering if an interface exists for driving the amplifier
> > inputs and receiving encoder inputs from parallel ports. Is Visual
> > Basic or some form of C programming capable of this? I have used
> > Visual Basic as an interface for the PCI motion control cards.
> > I know Geko makes drives capable of running servo motors using step &
> > direction signals from stepper software. Has anyone done this and is
> > the performance truely that of a servo system? I'm not looking for
> > top servo performance, but I would like better than stepper can
> > provide.
> > Thanks
> >
>
> If what you are asking is can you hook up your analog servo amps to the
> parallel port and work some magic with VB or C to run them , the answer is
> no. Standard servo amps have an analog input of + or - 10V and the
parallel
> port is strictly digital
>
> I as well as others on the list use step and direction servos driven by
> Geckos and Rutex drives and while I can't speak for the Rutex drives, the
> performance of the Gecko servo drives is very good. Much much better than
> steppers in my opinion. I will never use steppers again after using
servos.
> I was never 100% confident that my stepper system was where it was
supposed
> to be. Every time I ran my machine I was always wondering if I just ruined
> that piece of aluminum because of lost steps. I know others have got their
> steppers to work well but I never could. Since I got the Gecko servo
drives
> I no longer worry about such things.
>
> John Elson has an interface that hooks to the parallel port and drives
> standard analog servo drives, although as far as I know it is only
supported
> by EMC.
>
> Bill
>
>
>
>
>
>
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