On Friday, February 25, 2022 6:10:06 PM EST Chris Albertson wrote: > Non-trivial kinematics is when moving one axis causes another axis to > move. We call these "serial links" > > For example, if you were to mount one rotary axis "B" cross-wise on > another rotary axis "A" such that moving "A" redefines where "B" is > pointing to. This is common with robots but uncommon with machine > tools. > > But even with a complex robot arm that has a chain of 7 rotary joints, > one connected to the next in a chain. You could still drive it with > trivial kinematics. The coordinate space would be "joint angles". > It would be really hard to program but could be done. > > > My question? Why not do this on a lathe? If this is in wood, cut a > tool with the thread profile on a bench grinder (or your mill) A > good source of tool steel for custom prile shaper blades is paddle > drills. They are cheap and come in different widths and you can turn > a paddle drill into a custom shape pretty quickly.
I think my major concern of doiong it on the lathe is a lack of a follower rest compatible with wood given the forces of using a full width tool which would more than likely make it fat by an unknown amount in the middle. OTOH, a sc carbide bit takeing a 3 thou cut at 18k revs, shouldn't exert near as much bending force. It would take longer by far, but I'd get a more accurately sized screw, which will probably outlast me. Besides, I need the exersize of writing the code. Thanks Chris, take care and stay well. [...] Cheers, Gene Heskett. -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author, 1940) If we desire respect for the law, we must first make the law respectable. - Louis D. Brandeis Genes Web page <http://geneslinuxbox.net:6309/gene> _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
