Re: [CAD_CAM_EDM_DRO] Low cost Servo drives +/-10V analog....and Camsoft.

Dan, Gecko or Rutex will be your best bet for well built low cost drives.
As far as the Camsoft software I'm still playing with it. So far seems to be
ok. One thing I don't care for is the display setup and the lack of options
to change its apperance. Camsofts software does have an open framework for
modification if your willing to learn the program language.
http://www.geckodrive.com/
http://www.rutex.com/home/
Regards
Shawn

----- Original Message -----
From: "dan" <dk1machine@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Wednesday, October 08, 2003 9:58 AM
Subject: [CAD_CAM_EDM_DRO] Low cost Servo drives +/-10V analog....and
Camsoft.


>
> This question may have been asked hundreds of times....
> Looking for a source of servo drives that accept +/-10Vdc
> analog input. Low cost (of course). The Advanced and Copely's
> are a bit pricy IMHO. Elmo looks interesting, but they wouldn't
> sell me 2 or 3, at reasonable prices. They deal in OEM quantities
> only. Need something in the 80V 10/15A cont. size range.
>
> Thanks
>
> Shawn: How do you like the Camsoft product so far??
>
> dan k
>
>
>
>
>
> --- In CAD_CAM_EDM_DRO@yahoogroups.com, "Shawncd" <shawncd@p...>
> wrote:
> > Thanks to everyone that responded...
> >
> > Jon,
> > To answer most of your questions here is what I have done so far.
> When I
> > first got the machine home I installed a Advantech industrial
> computer with
> > a Galil DMC 1040 control card. Next I installed Galils servo tuning
> software
> > and Camsofts cnc software. As I tuned the servos for the new system
> I
> > noticed that Z wasn't working, so I diagnosed and found the servo
> amp to be
> > the culprit. After searching all over tarnation for the best price
> on a new
> > / used one. I found one that was identical, except for it has the
> latest
> > revisions. (electrically the board looks a little different from the
> > original) After installing it I noticed that with just axis Z
> plugged in
> > there was silence. No whining noise, as with the other drives. So
> that's
> > when I started questioning the older drives. Maybe the older units
> just
> > sound this way because of the lower frequency. And the newer revised
> > versions have the fix for this nusense noise. Or maybe the other two
> are
> > about to fry as well. Which would make sense because there all the
> same age.
> > Anyway, the other two older drives seem to function and hold
> tolerance. But
> > it started to make me wonder if I should start looking for two more
> drives
> > to replace the others. With hardly any support coming from Servo
> Dynamics
> > this was my next best place for info.
> >
> > Regards
> > Shawn
> >
> >
> >
> >
> > ----- Original Message -----
> > From: "Jon Elson" <elson@p...>
> > To: <CAD_CAM_EDM_DRO@yahoogroups.com>
> > Sent: Tuesday, October 07, 2003 9:37 AM
> > Subject: Re: [CAD_CAM_EDM_DRO] Servo Dynamics 1525 servo drive noise
> >
> >
> > >
> > >
> > > shawncd2001 wrote:
> > >
> > > >I recently purchased an older Milltronics Partner mill. This
> > > >particular unit uses the older Servo Dynamics 1525 servo drives.
> > > >I have tuned the drives to where they perform the way I want
> them,
> > > >but there is an ear piercing whine or whistling sonund coming
> from
> > > >the boards. Anybody out there have the same problem? Any ideas on
> a
> > > >fix? Any information would be much appreciated.
> > > >
> > > >
> > > >
> > > Yup, these older drives have very low frequency PWM cycles, and so
> > > produce lots of audible tone. Looking in the book, it says it is
> 16 KHz.
> > > Most people past their 20's can't hear much up there anymore.
> This would
> > > be the same pitch as the horizontal output of a TV set.
> > >
> > > I'm wondering if what you are getting is a subharmonic or
> unrelated
> > > lower frequency than the 16 KHz? Can you make the pitch or
> loudness
> > > of the tone change by moving the axis to a different position, or
> > > manually damping the shafts (motor, encoder, tach) with your
> hands?
> > > Can you make a guess at the frequency of the tone? Are you sure
> it
> > > is coming from the servo amp, and not the motor?
> > >
> > > You might also disconnect or disable all but one amp at a time to
> see
> > > if it is one particular amp, or all of them emit this tone. If
> you can
> > > disconnect the velocity command signal from the CNC control to
> > > the amps, you can see if this is a positioning loop oscillation,
> or
> > > just in the servo amp.
> > >
> > > The Servo Dynamics does have inductors on the output. They appear
> > > to be quite small, so it doesn't seem likely they are emitting
> much
> > > sound. There is a large transformer (T3) on the circuit board. I
> have
> > > only partial schematics of this amp, but I assume this is a DC-DC
> > > converter that provides isolated power to floating circuits in the
> > > amp. It may be running at an abnormally low frequency. Without
> > > diagrams, I can't go much further. You could try wrapping foam
> > > around this transformer, but if it already runs hot, that might
> not
> > > be a good idea.
> > >
> > > Jon
> > >
> > >
> > > Addresses:
> > > FAQ: http://www.ktmarketing.com/faq.html
> > > FILES: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO/files/
> > > Post Messages: CAD_CAM_EDM_DRO@yahoogroups.com
> > >
> > > Subscribe: CAD_CAM_EDM_DRO-subscribe@yahoogroups.com
> > > Unsubscribe: CAD_CAM_EDM_DRO-unsubscribe@yahoogroups.com
> > > List owner: CAD_CAM_EDM_DRO-owner@yahoogroups.com,
> wanliker@a...,
> > timg@k...
> > > Moderator: pentam@c... indigo_red@q... [Moderators]
> > > URL to this group: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO
> > >
> > > OFF Topic POSTS: General Machining
> > > If you wish to post on unlimited OT subjects goto:
> > aol://5863:126/rec.crafts.metalworking or go thru Google.com to
> reach it if
> > you have trouble.
> > > http://www.metalworking.com/news_servers.html
> > >
> > > http://groups.yahoo.com/group/jobshophomeshop I consider this to
> be a
> > sister site to the CCED group, as many of the same members are
> there, for OT
> > subjects, that are not allowed on the CCED list.
> > >
> > > NOTICE: ALL POSTINGS TO THIS GROUP BECOME PUBLIC DOMAIN BY POSTING
> THEM.
> > DON'T POST IF YOU CAN NOT ACCEPT THIS.....NO EXCEPTIONS........
> > > bill
> > > List Mom
> > > List Owner
> > >
> > >
> > >
> > > Your use of Yahoo! Groups is subject to
> http://docs.yahoo.com/info/terms/
> > >
> > >
>
>
> Addresses:
> FAQ: http://www.ktmarketing.com/faq.html
> FILES: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO/files/
> Post Messages: CAD_CAM_EDM_DRO@yahoogroups.com
>
> Subscribe: CAD_CAM_EDM_DRO-subscribe@yahoogroups.com
> Unsubscribe: CAD_CAM_EDM_DRO-unsubscribe@yahoogroups.com
> List owner: CAD_CAM_EDM_DRO-owner@yahoogroups.com, wanliker@...,
timg@...
> Moderator: pentam@... indigo_red@... [Moderators]
> URL to this group: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO
>
> OFF Topic POSTS: General Machining
> If you wish to post on unlimited OT subjects goto:
aol://5863:126/rec.crafts.metalworking or go thru Google.com to reach it if
you have trouble.
> http://www.metalworking.com/news_servers.html
>
> http://groups.yahoo.com/group/jobshophomeshop I consider this to be a
sister site to the CCED group, as many of the same members are there, for OT
subjects, that are not allowed on the CCED list.
>
> NOTICE: ALL POSTINGS TO THIS GROUP BECOME PUBLIC DOMAIN BY POSTING THEM.
DON'T POST IF YOU CAN NOT ACCEPT THIS.....NO EXCEPTIONS........
> bill
> List Mom
> List Owner
>
>
>
> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
>
>