there are hydrualic servo systems, but it seems like they might not be stiff enough for a milling cutter.
i wonder, in the ball worm mechanism, why not make the worm engagement happen over more like a quarter of the diameter of the gear. the worm would have a sort of wormhole shape - larger on both ends and skinny in the middle. the harmonic drive seems like a good choice for fine rotary motion, but it is also a complex mechanism. the disadvantages of a screw and pivot mechanism are that the input and output displacements are not linearly proportional, and continuous rotation thru many revolutions would require a two phase screw set to avoid getting stuck at the limits of stroke. the result is another complex mechanism. --- On Sun, 5/13/12, Kirk Wallace <kwall...@wallacecompany.com> wrote: > From: Kirk Wallace <kwall...@wallacecompany.com> > Subject: Re: [Emc-users] Some advice needed > To: "Enhanced Machine Controller (EMC)" <emc-users@lists.sourceforge.net> > Date: Sunday, May 13, 2012, 8:32 PM > On Sun, 2012-05-13 at 14:43 -0700, > charles green wrote: > ... snip > > has anyone ever heard of a ball worm? > ... snip > > http://urobotics.urology.jhu.edu/projects/BW/ > > To me, it seems too light duty for CNC work. Maybe more than > one input > shaft could be used to spread the load and maybe also > provide preload, > but this starts to get too complex for my taste. My plan for > a robotic > arm tool and work piece changer will be like a miniature > back hoe arm, > http://www.wallacecompany.com/machine_shop/Case_580C/dcp_6721.jpg > > > but use ball screws in place of the hydraulic cylinders. > > -- > Kirk Wallace > http://www.wallacecompany.com/machine_shop/ > http://www.wallacecompany.com/E45/index.html > California, USA > > > ------------------------------------------------------------------------------ > Live Security Virtual Conference > Exclusive live event will cover all the ways today's > security and > threat landscape has changed and how IT managers can > respond. Discussions > will include endpoint security, mobile security and the > latest in malware > threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > ------------------------------------------------------------------------------ Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
