On Tue, 2010-11-16 at 20:40 +0000, Andy Pugh wrote: > On 16 November 2010 20:12, Kirk Wallace <kwall...@wallacecompany.com> wrote: > > >> Yes, you can buy them by the foot. (at about $15 a foot) > > > > Huh? I would guess ground double nut (for preload) 1.00" diameter Z ball > > screw and nut at about $300 per foot. > > http://www.slidesandballscrews.com/r2005-ballscrew-p-129.html?cPath=39_129_133 > with a double, zero-backlash nut at £100. > > The cheap option is: > http://www.slidesandballscrews.com/sf2005-ballscrew-p-432.html?cPath=39_128_130 > with single, some-backlash nuts at £28.
That pricing is a little hard to believe, but if you are getting good results, more power to ya. At four feet 20mm diameter is a tad small, but in the ball park. C7 is good enough for a router, but I wouldn't like using it on a precision lathe. It's not so much about the accuracy, because you can map the error out, but you need the accuracy to get enough preload to get consistent positioning, but not so much that you get short screw life. I've been burned on ball screws, more than once, so I lump ball screw sales in the same boat as used car sales. These people come as close to lying about their products as possible, so my current thinking is to order the best I can possibly afford and hope that it is good enough. -- Kirk Wallace http://www.wallacecompany.com/machine_shop/ http://www.wallacecompany.com/E45/index.html California, USA ------------------------------------------------------------------------------ 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
