Re: [CAD_CAM_EDM_DRO] Does this make sense? was Re:BentNookballscrews ?????

Have you ever packed Wheel Bearings on a car? I'll put a beer on it that
you havent......
They are preloaded and every manufacturer recommends a different preload.

So you've setup two machines.... Hmmm...
Why dont you give us some pics of the equipment so this barefoot hillbilly
from the sticks can sees what your doing? :)
(thatd be me..)

----- Original Message -----
From: "Kim Lux" <lux@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Tuesday, August 12, 2003 1:32 PM
Subject: RE: [CAD_CAM_EDM_DRO] Does this make sense? was
Re:BentNookballscrews ?????


> Yes, I read them and I fully understand them.
>
> Did you ever replace the wheel bearings in a car ? The two bearings act
> the very same way as the ball nuts do on a ball screw. When you tighten
> the preload the drag increases. The amount the drag increase is
> proportional to the preload and in our case, with a 5 TPI ball screw,
> the torque required in inlbs is 1/31st of the preload in pounds.
>
> Have you guys ever actually worked with a ballscrew and ballnuts,
> applying preload ? I've set up 6 axes in the last few weeks.
>
> Kim
>
>
>
>
> On Tue, 2003-08-12 at 14:17, Carlos Guillermo wrote:
> > Kim -
> >
> > Did you have a chance to read Hiwin's ballscrew app notes? You
> > can find a copy here:
> > http://www.ruchservomotor.com/PDF/H_Ballscrews(full).pdf
> > There's an equation for "preload drag torque" on page 28 that you
> > may want to study. We're all trying to tell you the same thing in
> > different ways, but maybe this equation will clarify things.
> >
> > Regards,
> >
> > Carlos Guillermo
> > VERVE Engineering & Design
> >
> > -----Original Message-----
> > From: Kim Lux [mailto:lux@...]
> > Sent: Tuesday, August 12, 2003 12:44 PM
> > To: CAD_CAM_EDM_DRO@yahoogroups.com
> > Subject: Re: [CAD_CAM_EDM_DRO] Does this make sense? was Re:Bent
> > Nookballscrews ?????
> >
> >
> >
> >
> > > But, I am totally convinced that putting a heavy preload force
> > between two
> > > ball nuts by some spring-like mechanism will not cause a torque
> > load
> > > on the screw of the same magnitude as delivering that same force
> > to
> > > an external axial load.
> >
> > It absolutely DOES ! All I have to do is tighten down the bolts
> > on our
> > 2 ballnut setups and the friction goes way up. I've set up 6 axes
> > in
> > the last few weeks, so I think I know what I am seeing. And this
> > isn't
> > the difference in the ballscrew lead pitch either.
> >
> > > If Mr. Lux would care to drop by my shop, I
> > > am pretty sure I could throw together a demonstration of this in
> > a couple
> > > of minutes that he would be absolutely unable to refute.
> >
> > Sorry, I've seen the opposite in our shop.
> >
> > > Jon
> > >
> >
> >
> >
> >
> > Addresses:
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> > OFF Topic POSTS: General Machining
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> >
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> --
> Kim Lux <lux@...>
>
> Addresses:
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> Post Messages: CAD_CAM_EDM_DRO@yahoogroups.com
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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/
>
>
>