On 05/22/2013 02:35 PM, Gregg Eshelman wrote: > I could try some of the high strength urethane resins I use to make > replicas of classic car light lenses. I do the casting in a pressure > tank so there's no bubbles. Of course I use mold release to keep the > resin from sticking to things I don't want it stuck to.
I'd stick to the acetal (aka Delrin). Its physical properties are nearly ideal for forming nuts on threaded rod. The harder formulations of urethane look hard, but I'd bet it'll wear quickly in this application and probably be a lot stickier so you'd need a lot of force to turn the threaded rod in the thread formed nut. There are ultra wear resistant versions of acetal that have PTFE (Teflon) in the mix. These would probably be a good variation on that theme, but I'd avoid experimenting with other plastics unless you don't mind experiments with low probabilities of success. You might get lucky, but I doubt you'd do better than the acetal family in this application. If you still want to experiment, you might try UHMW. I think it'd have a much better chance of producing a positive result than urethane. Search for acetal at McMaster-Carr to see the different versions and buy it in small quantities. I've been contemplating this method to eliminate most of the backlash in my cheap import milling machine. I think it's now over .025" in the X and almost as bad in the Y. I do the backlash compensation now, turning the wheels by hand for simple low tolerance work, but that backlash needs to be gone when I convert it to CNC later this summer. I'll probably splurge on some Chinese ball screws. ------------------------------------------------------------------------------ Try New Relic Now & We'll Send You this Cool Shirt New Relic is the only SaaS-based application performance monitoring service that delivers powerful full stack analytics. Optimize and monitor your browser, app, & servers with just a few lines of code. Try New Relic and get this awesome Nerd Life shirt! http://p.sf.net/sfu/newrelic_d2d_may _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
