2013/12/11 Gene Heskett <ghesk...@wdtv.com> > Huge yabut there. Co$t... The precision of the ball screw apparently > isn't needed, and keeping it clean for long life could be a problem, > particularly when the nylon nut can be replaced several times during > overnight maintenance for 2% of the cost of the ball screw and nut that > size. Assuming reasonably clean screws, and a heat formed acetal/delrin > nut I'd think screw/nut life would be quite reasonable and its lower > friction compared to nylon, a win-win. And heat molded acetel can have > backlash under .001". Just shield it if you can from the induction > heating. External air coming it would lower it 100F or more, doing wonders > for any "cold flow" the constant weight might induce. So would gun > drilling the screw and running room temp recycled water through it if the > screw gets too hot to touch. Easy if the nut is driven and the screw > mounted rigidly. >
Yes, it would cost a lot and as you said keeping it clean requires some kind of telescopical cover to be made. So that idea is not convenient. I wasn't familiar with delrin, I was checking now that you mentioned and I have some sellers near so I can ask and replace it in the near future. The nut and screw are almost 400 mm from the source of the heat and also the lobes being heated are not big enough to radiate heat to the screw or nut, so that's not a problem as I see it. Is this material easy to machine? When you're talking about heat molded I assume is the way they make the long bars which they fraction later. -- *Leonardo Marsaglia*. ------------------------------------------------------------------------------ Rapidly troubleshoot problems before they affect your business. Most IT organizations don't have a clear picture of how application performance affects their revenue. With AppDynamics, you get 100% visibility into your Java,.NET, & PHP application. Start your 15-day FREE TRIAL of AppDynamics Pro! http://pubads.g.doubleclick.net/gampad/clk?id=84349831&iu=/4140/ostg.clktrk _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
