25Khz glitch ? (was Re: Ideas for matching drives on a YY axis design?

--- In CAD_CAM_EDM_DRO@y..., "deanc500" <deanc@v...> wrote:
> I have a machine with dual y motors and matching them didnt seem to be
> an issue. I just kept the tuning pots at approx the same place by eye
> and it works great. I dont think the tuning is that critical. In other
> words, close is good enough.
>
> Just a sidenote for those having trouble tuning G320's: My main
> problem was trying to get good rapid speeds out of the machine. My
> G320 drives would fault randomly at frequencies over about 25Khz. I
> need 40Khz+ to get 100 ipm travel speed. I finally booted the machine
> into "safe mode command prompt only" (yes dos safe mode doesnt load
> himem.sys or anything)and now I can reliably get 60Khz out of it. At
> those frequencies, it only takes a 2.1 ms glitch to fault the drives.
> Dean
>
>
> --- In CAD_CAM_EDM_DRO@y..., "caudlet" <tom@t...> wrote:
> > Group:
> >
> > Here is the basic design. Moving gantry table 72" X 80" (outside)
> > with twin ballscrew servo drives on the YY axis. Just got my Gecko
> > 340's in yesterday and in reading the tuning instructions I started
> > to think about ways to "balance" the two YY drives. The servos have
> > 500 count encoder as well as tach feedback.
> >
> > What is the best way to setup the twin screws so they have the same
> > characteristics? I have lots of test equipment (300Mhz Tek Scope,
> > power supplies, scope current probe, function generator, etc). For
> > those of you that have used and setup the Gecko's feel free to throw
> > in your 2 cents!