All ball screws have a 'gothic arch' profile, less friction that way as there is no rubbing.
Regards, ----- Original Message ----- From: "Erik Christiansen" <[email protected]> To: <[email protected]> Sent: Tuesday, June 09, 2009 11:47 AM Subject: [Emc-users] Ball Worm [Was: Re: Mill-Drill needs steppersand servos?] > On Mon, Jun 08, 2009 at 08:51:09AM -0700, Kirk Wallace wrote: >> >> I need to figure out how to make one of these: >> http://urobotics.urology.jhu.edu/projects/BW/ > > What an intriguing device that is. > > The worm seems to need to run inside a smooth cylindrical bore, so that > the balls can follow the worm grooves without resistance, but not fall > out. They've made the diagonal recirculation tunnel by fitting the blue > plug into a drilled bore in the worm, and pinned it. On the animation we > can see that the balls go down into the tunnel, using a ramp which takes > the end grooves around the other half of the circumference. (There is no > part left at the full diameter of the cylinder from which the worm is > cut.) That's about as much as I can figure, just looking at those blurry > balls go round. > > The Hiwin ballscrews are claimed to benefit from contact at only two > points in the groove, so it may not be necessary to cut grooves which > exactly mimic the ball profile. > > If you do make one, you will tell us how it goes, won't you? :-) > > Erik > > ------------------------------------------------------------------------------ > Crystal Reports - New Free Runtime and 30 Day Trial > Check out the new simplified licensing option that enables unlimited > royalty-free distribution of the report engine for externally facing > server and web deployment. > http://p.sf.net/sfu/businessobjects > _______________________________________________ > Emc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users -------------------------------------------------------------------------------- No virus found in this incoming message. Checked by AVG - www.avg.com Version: 8.5.339 / Virus Database: 270.12.53/2154 - Release Date: 06/04/09 05:53:00 ------------------------------------------------------------------------------ Crystal Reports - New Free Runtime and 30 Day Trial Check out the new simplified licensing option that enables unlimited royalty-free distribution of the report engine for externally facing server and web deployment. http://p.sf.net/sfu/businessobjects _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
