On 12/11/2013 4:35 PM, Leonardo Marsaglia wrote: > 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.
Make a metal holder for the nut, typically in two halves. Machine a block of Delrin or Acetal (they're similar but not quite chemically identical) to fit the holder, with a hole sized to the thread root of the screw it'll be running on. Split the block in half lengthwise. Place the halves into the halves of the metal holder and clamp over the screw. Heat the screw on both sides of the nut block and apply pressure until the plastic melts and the metal holder is pressed together. Remove heat and keep things still until it all cools. Unscrew the formed nut from the screw and clean up the ends. Cut in half lengthwise if you're making a split nut. You can also use oversize blocks of the plastic then with the melted together block still on the screw, machine it to final shape so it will be aligned with the screw. Delrin and Acetal have very good lubricity, even better in graphite impregnated types, and will wear for a long time. ------------------------------------------------------------------------------ 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
