Re: [CAD_CAM_EDM_DRO] Re: Geckos, Servos, VFD and twitching on Z axis

Try this one

www.digikey.com
PREO EMI Filter
PN: 20EB66
Digikey PN: 364-1010-ND

Jim

----- Original Message -----
From: "Mariss Freimanis" <mariss92705@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Sunday, November 21, 2004 8:23 PM
Subject: [CAD_CAM_EDM_DRO] Re: Geckos, Servos, VFD and twitching on Z axis


>
>
> Your spindle motor drive is an enourmous noise maker. Isolate it with
> an RF line noise filter (Corcomp or similar). It will make all your
> troubles go away.
>
> Mariss
>
> -- In CAD_CAM_EDM_DRO@yahoogroups.com, "Raymond Heckert" <jnr@a...>
> wrote:
> > How close to the Z-axis controller to the VFD? Maybe the
> > electrical 'noise' is causing problems. Are you using the
> > quill as the Z, or are you raising & lowering the table to
> > effect a Z-move? Is your ram rigid enough to prevent it's
> > movement under power? Does the 'drifting repeat itself
> > with any kind of regularity, under load? These are all
> > things I'd take into consideration in troubleshooting.
> >
> > RayHex
> >
> > ----------
> > > From: yethdear0 <da-mack@e...>
> > >
> > >
> > > Hiya,
> > >
> > > We have an old Hurco knee mill that we have stripped and
> > retro-ed
> > > with a pc, CNCPro, Geckos and a Baldor VFD for the
> > spindle motor. We
> > > just got it all up and running but have a problem with
> > the Z axis
> > > servo or controller. Using a travel indicator on the Z
> > axis, the
> > > movement is smooth and exact. We have the machine running
> > a program
> > > that move Z -.100" pauses for 1 second and then moves Z
> > +.100" and
> > > then runs in a loop. When we turn on the VFD and the
> > spindle, the Z
> > > axis seems noisy and the travel on the indicator will
> > start to
> > > drift .001" to .005" each time the program cycles. The
> > drift is
> > > random, sometimes positive and sometimes negative but
> > positive the
> > > majority of the time. When we slowed the motion to 1 ipm,
> > you can
> > > see the motion twitch at random during the movement. This
> > only
> > > happens when the spindle is running and only the on the Z
> > axis. We
> > <snip>
>
>
>
>
>
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