Our K&T has boxed ways with recirculating roller bearings. http://www.electronicsam.com/images/KandT/conversion/tikkoway.JPG (isn't the exact type but similar) - so each axis has 12 each.
sam On 11/18/2010 11:15 AM, Jon Elson wrote: > Viesturs La-cis wrote: >> if that is just a base for machine, I suspect that the machine itself >> also will be very massive and very heavy to provide for rigidity and >> vibration damping in order to achieve the high precision in >> hard-to-machine materials. so the question is - what kind of >> bearings/slides are there to be used and what kind of actuators are to >> be used for such a machine? the same old Hiwin rails, but 3 or 4 >> instead of one and same old ballscrews with some extreme 10" diameter? >> > Some of the very large machines are hydrostatic. They look very much > like conventional > box ways, but have an oil port in the center, and and a hydraulic pump > provides a steady > flow of oil to the bearing pad. There is usually some scheme of bladders > or wipers and a > scavenge pump to return the oil to the lube system. Stuart Stevenson at > MPM has a Gidding and Lewis > horizontal boring mill like that, I think the table is about 50 feet long. > > Jon > > ------------------------------------------------------------------------------ > Beautiful is writing same markup. Internet Explorer 9 supports > standards for HTML5, CSS3, SVG 1.1, ECMAScript5, and DOM L2& L3. > Spend less time writing and rewriting code and more time creating great > experiences on the web. Be a part of the beta today > http://p.sf.net/sfu/msIE9-sfdev2dev > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > ------------------------------------------------------------------------------ Beautiful is writing same markup. Internet Explorer 9 supports standards for HTML5, CSS3, SVG 1.1, ECMAScript5, and DOM L2 & L3. Spend less time writing and rewriting code and more time creating great experiences on the web. Be a part of the beta today http://p.sf.net/sfu/msIE9-sfdev2dev _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
