2013/4/15 jeremy youngs <jcyoung...@gmail.com> > right but i dont see why automated homing would be excluded . just using > the panels as the touch off instead of homing switches > pretty simple no? >
No, because to move torch (or whatever instrument) along X, both joints have to turn in opposite directions, but for movement along Y both joints have to move in the same direction. I do not see a way to home each joint separately by triggering homing switches with gantry or whatever that is in movement. I agree with Todd that some marker on a belt would be best, but only thing I can come up with is to draw some line or something and then try to optically read it. Or maybe some tweaking with identical home search and latch velocity for one joint and home_latch_vel = 0 for the other joint together with some HAL/ladder magic to treat the actual switch signals so that it looks something like this example: 1) hit "home all" and both joints are searching the limit switch - both motors turn in opposite directions and move along X 2) when X axis home switch is reached, one motor starts to latch from the switch, both motors turn in the same direction and now the torch moves along Y; 3) when Y home switch is triggered, HAL should tell the first joint, that its switch is released and the second joint would also be homed. My theory says this should work :)) Those velocities should be really slow to make the homing more precise. -- Viesturs If you can't fix it, you don't own it. http://www.ifixit.com/Manifesto ------------------------------------------------------------------------------ Precog is a next-generation analytics platform capable of advanced analytics on semi-structured data. The platform includes APIs for building apps and a phenomenal toolset for data science. Developers can use our toolset for easy data analysis & visualization. Get a free account! http://www2.precog.com/precogplatform/slashdotnewsletter _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
