On Fri, Sep 14, 2012 at 9:44 AM, Stephen Dubovsky <smdubov...@gmail.com> wrote: > On manual knee mills there are often ways to combine the knee and > quill scales in the DRO to directly add/subtract from one another, > giving only one combined Z reading. This part would be easy enough to > do in HAL on a CNC. Add/subtract the quill encoder to the knee's > linear encoder(scale). If the drives were enabled (but not > necessarily cutting), the quill would even 'chase' the knees position > trying to hold a commanded Z.
I can see some issues to think about: - a given Z is not unique: what method do you use? hold the knee, move the quill? hold quill, move knee? coordinated move of both at an arbitrary ratio? what if you hit limit on one? - there's probably a different accuracy and backlash on the quill vs. the knee. It might be a challenge to linearise the setup for reliable positioning, even if one used a fixed strategy. - if you had a good, reliable actuators on both, it might actually result in increased precision, by using differential drive ------------------------------------------------------------------------------ Got visibility? Most devs has no idea what their production app looks like. Find out how fast your code is with AppDynamics Lite. http://ad.doubleclick.net/clk;262219671;13503038;y? http://info.appdynamics.com/FreeJavaPerformanceDownload.html _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
