On 04/13/2016 12:29 PM, dan...@austin.rr.com wrote: > Z-homing upwards for machine coordinate zeroing doesn't serve a lot > of point for manual toolchangers. It can't prevent crashing into the > table because you don't know how far the tool tip is from the nut. > Zeroing the work coordinates to the table or top of the material is > essential for almost all ops, though.
All my machines use manual tool changing, and they all home Z upwards (away from the table). Remember, "homing" means finding the machine's position within the work envelope (ie, finding the actual machine coordinates of the controlled point), and "touch-off" means finding the controlled point's position relative to the work or fixture. They're different operations with different requirements. Homing happens only once, at machine startup (plus each time your joint motors lose power, if you are using VOLATILE_HOME). Touch-off happens once for each tool change and each new setup. I'm thinking now that you're asking about touch-off, not homing. >> Maybe you could implement this with some hal circuitry like this >> (hal pseudocode): >> >> z-home-button-in => halui.joint.2.home >> (!axis.2.homing || z-home-button-in) => motion.enable > > I'm not sure I follow these "enable" solutions. I don't want it to > be NOT enabled for other purposes if the button isn't true. Does NOT > motion.enable being true render axis.2.homing false, so it will end > the homing, make homing FALSE, so motion.enable subsequently becomes > TRUE while the homing button is still FALSE? That second line reads like this: motion.enable is True if either: 1. axis.2.homing is False, or 2. axis.2.homing is True and the z-home button on the pendant is pushed Otherwise motion.enable is False. -- Sebastian Kuzminsky ------------------------------------------------------------------------------ Find and fix application performance issues faster with Applications Manager Applications Manager provides deep performance insights into multiple tiers of your business applications. It resolves application problems quickly and reduces your MTTR. Get your free trial! https://ad.doubleclick.net/ddm/clk/302982198;130105516;z _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
