Re: [CAD_CAM_EDM_DRO] Re: Baldor spindle motor as servo motor 4th axis

The only thing that I can think of is that a true servo motor is designed to
produce it's rated continuous torque at any rpm from max all the way down to
stall without overheating whereas your baldor probably needs to be turning
at some minimum speed for the fan to move enough air for cooling. If this
were to turn out to be a problem you could always add a seperately powered
fan.

As for the amp, you need to take into consideration the voltage and current
specs for the motor. If it has a 180 volt armature, the gecko won't do it.
Also you may need a field supply if it is not a permanent magnet field.

Bob

----- Original Message -----
From: "Keith Clark" <mail@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Saturday, January 14, 2006 6:27 AM
Subject: [CAD_CAM_EDM_DRO] Re: Baldor spindle motor as servo motor 4th axis


> I guess this idea begs the question - what is the difference between a
> DC motor and a servo motor? Is there something about a DC servo motor
> that makes it different that taking a DC 1750 3 hp motor and adding a
> servo amp and encoder?
>
> thanks
> Keith
>
> --- In CAD_CAM_EDM_DRO@yahoogroups.com, "Keith Clark" <mail@t...> wrote:
> >
> > --- In CAD_CAM_EDM_DRO@yahoogroups.com, "Bob Muse" <mtebob1@s...> wrote:
> > >
> > > Hi Keith
> > >
> > > Your 3hp DC motor can function as a servo motor with the addition
> of an
> > > encoder and a servo drive or amp as they are called. Is there some
> > > reduction (belt or gear etc) between the motor and spindle?
> > >
> > > Bob
> >
> > Bob,
> >
> > You said the magic words! Making that motor a servo would be great!
> > Could it then function as a spindle motor with controllable rpm as
> > well as a servo motor 4th axis motor?
> >
> > There is an available encoder for the motor. Yes there is a belt
> > drive that I need to convert to a cogged timing belt and pulley drive
> > system so I can customize it to whatever will work. Is the Gecko 340
> > a servo drive that I would use?
> >
> > Thanks
> > Keith
> >
>
>
>
>
>
>
> 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@... davemucha@...
[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
>
>
> Yahoo! Groups Links
>
>
>
>
>
>
>