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

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
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> http://www.metalworking.com/news_servers.html
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> 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........
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--
Kim Lux <lux@...>