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

On Tue, 2003-07-08 at 10:20, Peter R wrote:
> Kim, click on the URL for this group which is at the bottom of every
> post and select the photos section. It is after the various picture
> folders in the main folder, so to speak. You should browse these photos
> because you'll see many examples of this and similar issues that you
> will face and you'll see how others have solved these problems. Just as
> there is a wealth of knowledge in the old posts, the photos section is
> also a great resource for newcomers to the group.
>
> Cheers, Peter
>
> Kim 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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> >>
> >>
> >>
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> >>
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> >>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.
> >>
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> >>bill
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>
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>
> OFF Topic POSTS: General Machining
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> 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........
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--
Kim Lux <lux@...>