On Thu, Feb 3, 2011 at 12:21 PM, andy pugh <bodge...@gmail.com> wrote:
> On 3 February 2011 18:12, Kirk Wallace <kwall...@wallacecompany.com> > wrote: > > > > I would look at the maximum motor RPM, decide on an maximum joint rate, > > then set up a pulley ratio to match, so that the motor has the maximum > > mechanical advantage. > > However, this is a commercially-made CNC rotary table. You would have > to assume that the manufacturer knew what they were doing. > > The manufacturer is Troyke, not some noodle factory that is branching into making rotary tables. > I wonder if the bearing preload is just set too high? (assuming it has > bearings. And preload) > > Since this is based on a worm drive, there is definitely some tightness that is needed for the drive to not have too much backlash. There is nothing that is theoretically impossible to do to drive this, just that the control system needs to account for friction. i ------------------------------------------------------------------------------ Special Offer-- Download ArcSight Logger for FREE (a $49 USD value)! Finally, a world-class log management solution at an even better price-free! Download using promo code Free_Logger_4_Dev2Dev. Offer expires February 28th, so secure your free ArcSight Logger TODAY! http://p.sf.net/sfu/arcsight-sfd2d _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
