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 Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
