Re: [CAD_CAM_EDM_DRO] Re: LARGE Gantry table: Geckos on large servos.

On Wed, 2004-03-10 at 10:30, brunoian1127 wrote:
> Larkin makes a cobra drive that does 16 amps.
> This may help.
>
>
> --- In CAD_CAM_EDM_DRO@yahoogroups.com, Kim Lux <lux@d...> wrote:
> > I don't know if a Gecko will run a really large servo motor.
> >
> > We've got a 3HP servo motor, depowered by running at 80V, on a
> large
> > table of a special machine. We recently tested it with a Gecko
> 320 and
> > blew it up. It would operate fine at lower speeds, but the drive
> ran
> > warm. At higher speeds, the drive failed. It seemed to have
> problems
> > getting the damping/gain correct for such a large motor.
> >
> > We sent the drive back to Gecko. They looked at it but have not
> > commented on what exactly caused it to fail.
> >
> > I suspect that the motor would draw more than the rated max drive
> > current (ie 20Amps) during acceleration.
> >
> > Kim
> >
> >
> >
> >
> > On Tue, 2004-03-09 at 17:03, Leslie M. Watts wrote:
> > > Heh. Confused Chris? My friend Bob Campbell said a Gecko would
> > > handle it. I said it would need something bigger.
> > >
> > > To put things in perspective my 1000 lb gantry IS run by a Copley
> > > 412 which is about the same as a Gecko in power. So Bob is
> absolutely
> > > correct for the weight you asked about.
> > >
> > > I just think that a 20 ft gantry will be much more massive than
> my
> > > system. Things tend to go up in mass as the cube of length for
> equivalent
> > > stiffness. Sometimes even more. A finite element structure
> analysis
> > > can define this in the design stage.
> > >
> > > Les
> > >
> > > Leslie M.Watts
> > > L M Watts Furniture
> > > Tiger Georgia USA
> > > (706) 212-0242
> > > http://www.lmwatts.com
> > > Engineering page:
> > > http://www.lmwatts.com/shop.html
> > > CNC surplus for sale:
> > > http://www.lmwatts.com/forsale.html
> > > CNC carved signs:
> > > http://www.lmwatts.com/signwp.html
> > >
> > >
> > >
> > >
> > > -----Original Message-----
> > > From: Robert Campbell [mailto:bob@c...]
> > > Sent: Tuesday, March 09, 2004 6:09 PM
> > > To: CAD_CAM_EDM_DRO@yahoogroups.com
> > > Subject: Re: [CAD_CAM_EDM_DRO] LARGE Gantry table
> > >
> > >
> > > Chris,
> > >
> > > You will defiantly need a servo system. I would think that a
> Gecko drive
> > > would do it.
> > >
> > > You may want to post on the Gecko drive list.
> > >
> > >
> > > Bob Campbell
> > > Bob@c...
> > > www.campbelldesigns.com
> > > Breakout board
> > > THC board sets
> > > CNC router plans
> > > Stepper Motors
> > > ----- Original Message -----
> > > From: "cutthroatplasmaco" <cutthroatplasmaco@y...>
> > > To: <CAD_CAM_EDM_DRO@yahoogroups.com>
> > > Sent: Tuesday, March 09, 2004 3:52 PM
> > > Subject: [CAD_CAM_EDM_DRO] LARGE Gantry table
> > >
> > >
> > > > Can someone point me in the direction of suppliers for
> motors/drives
> > > > for LARGE gantry machines... I'm talking 20'x40' cutting area.
> Off
> > > > the top of my head, I'm guessing the gantry might way a half
> ton or
> > > > more. I'm very familiar with smaller steppers/servos, I just
> don't
> > > > quite understand where/what route you take when talking about
> large
> > > > machines that need significant torque to make a 1000lb gantry
> change
> > > > directions on a dime. It seems you need an ac servo that would
> run
> > > > off of signicantly more power than a gecko or similar can
> provide.
> > > > Any help/links would be appreciated.
> > > > Thanks,
> > > > Chris
> > > >
> > > >
> > > >
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> > > http://groups.yahoo.com/group/jobshophomeshop I consider this
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> > > 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.
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> > > bill
> > > List Mom
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> [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
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> > --
> > Kim Lux <lux@d...>
>
>
>
>
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> 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
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>
> Yahoo! Groups Links
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--
Kim Lux <lux@...>