CAD CAM EDM DRO - Yahoo Group Archive

Re: LARGE Gantry table

Posted by ballendo
on 2004-03-10 23:02:49 UTC
Les,

The reason you and Bob are both right is that Chris did not mention
the one really important issue left...

Speed. You CANNOT discern drive size/type needs without adding this
into the figuring... And even if you know speed, you still need to
know how quickly this speed must be attained and reduced; i.e.,
accel/decel values...

There IS a hint in his message though. The word plasma and cut are
both there in the sig, so I'd assume we're talking a fair bit of
spped. Which would "lean me" toward your assessment, and away from
Bob's...

But for now, the question is answered not by "G" or "C", but by D-not
enough info given for a correct answer<G>

Ballendo





--- In CAD_CAM_EDM_DRO@yahoogroups.com, "Leslie M. Watts"
<leswatts@a...> 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
> >
> >
> >
> > Addresses:
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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
>
>
> Yahoo! Groups Links

Discussion Thread

cutthroatplasmaco 2004-03-09 13:52:57 UTC LARGE Gantry table Robert Campbell 2004-03-09 15:09:44 UTC Re: [CAD_CAM_EDM_DRO] LARGE Gantry table Leslie M. Watts 2004-03-09 15:19:43 UTC RE: [CAD_CAM_EDM_DRO] LARGE Gantry table Leslie M. Watts 2004-03-09 16:04:46 UTC RE: [CAD_CAM_EDM_DRO] LARGE Gantry table Jon Elson 2004-03-09 20:17:11 UTC Re: [CAD_CAM_EDM_DRO] LARGE Gantry table Doug Fortune 2004-03-09 21:54:31 UTC Re: [CAD_CAM_EDM_DRO] LARGE Gantry table Elliot Burke 2004-03-10 08:34:50 UTC re:RE: LARGE Gantry table Kim Lux 2004-03-10 09:22:37 UTC RE: [CAD_CAM_EDM_DRO] LARGE Gantry table: Geckos on large servos. brunoian1127 2004-03-10 09:32:50 UTC Re: LARGE Gantry table: Geckos on large servos. Kim Lux 2004-03-10 10:08:29 UTC Re: [CAD_CAM_EDM_DRO] Re: LARGE Gantry table: Geckos on large servos. Lindsay 2004-03-10 10:08:31 UTC Re: [CAD_CAM_EDM_DRO] re:RE: LARGE Gantry table Jon Elson 2004-03-10 10:52:46 UTC Re: [CAD_CAM_EDM_DRO] LARGE Gantry table: Geckos on large servos. Jon Elson 2004-03-10 10:54:45 UTC Re: [CAD_CAM_EDM_DRO] LARGE Gantry table: Geckos on large servos. Kim Lux 2004-03-10 12:14:04 UTC Re: [CAD_CAM_EDM_DRO] LARGE Gantry table: Geckos on large servos. Kim Lux 2004-03-10 12:14:39 UTC Re: [CAD_CAM_EDM_DRO] LARGE Gantry table: Geckos on large servos. Elliot Burke 2004-03-10 16:16:23 UTC re:Re: re:RE: LARGE Gantry table billbryden 2004-03-10 21:16:54 UTC re:Re: re:RE: LARGE Gantry table Jon Elson 2004-03-10 21:29:53 UTC Re: [CAD_CAM_EDM_DRO] LARGE Gantry table: Geckos on large servos. Jon Elson 2004-03-10 21:44:45 UTC Re: [CAD_CAM_EDM_DRO] LARGE Gantry table: Geckos on large servos. ballendo 2004-03-10 23:02:49 UTC Re: LARGE Gantry table ballendo 2004-03-11 09:10:30 UTC Re: re:RE: LARGE Gantry table Leslie M. Watts 2004-03-11 11:34:34 UTC RE: [CAD_CAM_EDM_DRO] re:Re: re:RE: LARGE Gantry table Peter Reilley 2004-03-11 12:33:01 UTC Re: [CAD_CAM_EDM_DRO] LARGE Gantry table: Geckos on large servos. Mariss Freimanis 2004-03-11 12:51:43 UTC Re: LARGE Gantry table: Geckos on large servos. Kim Lux 2004-03-11 13:41:24 UTC Re: [CAD_CAM_EDM_DRO] LARGE Gantry table: Geckos on large servos. Jon Elson 2004-03-11 19:32:43 UTC Re: [CAD_CAM_EDM_DRO] LARGE Gantry table: Geckos on large servos. Peter Reilley 2004-03-11 22:02:32 UTC Re: [CAD_CAM_EDM_DRO] Re: LARGE Gantry table: Geckos on large servos.