On Wed, Apr 14, 2021 at 8:54 AM Thomas J Powderly <tjt...@gmail.com> wrote:
> A few of the larger EDMs we built had 5meter leadscrews with dbl nuts, > That would fix the issue too. They use two nuts with a spring between them. It is really the same concept as oversized balls. In both cases, the balls ride on the walls of the groove rather than the groove's bottom. Some day 100 years from now the ball screw on my mill z-axis might become worn but the screw is always in tension as it supports the weight of the milling head and motor so the balls ride on only the lower side of the groove and it will not matter much if the balls or groove is worn down over the years. My 3D printer works the same way but with acme lead screws, only one side of the screw thread Is used, so there is never backlash when the direction of motion reverses. -- Chris Albertson Redondo Beach, California _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
