Re: [CAD_CAM_EDM_DRO] Re: Counterweighting the Z axis ?; Power off position holding ?

Hello Kim,
We have a Hurco Mill in which Z-axis is balanced by a
Pneumatic Servo Cylinder. It works fine but some times
when air pressure changes or due to some other unknown
reason the tuning of z-axis motor becomes unstable and
we have to repeat agin the lenghty process of tunning.
Any how this is the orignal setup provided by the
manufacturer.

Thanks

Babar
--- Kim Lux <lux@...> wrote:

> Hi Peter.
>
> Thanks for the reply. Would you happen to have a
> link for those photos
> ?
>
> Kim
>
> On Tue, 2003-07-08 at 09:56, Peter R wrote:
> > I've had good results with two 150lb gas springs
> from McMaster Carr. If
> > you look in the photos section for " NEMA 42 - Gas
> Springs" you'll see
> > how I fitted them to my knee mill. The knee is
> raised/lowered by a ball
> > screw. With power removed, the knee always stays
> where it is. You may
> > be able to adapt the same general idea to your
> machine.
> >
> > My machine doesn't look as clean now as it did in
> Feb 2002... Plus it
> > has since been converted to servos for faster
> rapids.
> >
> > Cheers, Peter
> >
> > Kim Lux wrote:
> >
> > >Glad to hear I am not the only one.
> > >
> > >The problem with springs is that their force
> varies with where the head
> > >is. Maybe they could be adjusted for zero force
> in the home position.
> > >That wouldn't help for an EStop though.
> > >
> > >A regulated air cylinder could give a constant
> force with any position,
> > >but I'm worried the air dynamics would mess up
> the head motion.
> > >
> > >So far the best solution seems to be to counter
> weight it and/or apply a
> > >bit of drag to the ballscrew drive.
> > >
> > >Kim
> > >
> > >On Tue, 2003-07-08 at 08:46, tsalaff wrote:
> > >
> > >>Kim,
> > >>
> > >>I'm dealing with the same problem right now
> although my Z axis is only
> > >>40 lb.. Going to try making brackets to anchor
> support springs. Will
> > >>report on how these work.
> > >>
> > >>>motor the milling head will slide down the
> column as soon as power is
> > >>>removed from the servo.
> > >>>
> > >>>Kim Lux <lux@d...>
> > >>>
> > >>
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> >
> > OFF Topic POSTS: General Machining
> > If you wish to post on unlimited OT subjects goto:
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> 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
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> --
> Kim Lux <lux@...>
>
> Addresses:
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> 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/
>
>

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