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.
well that is how fadal always did it bur they didnt have a way to read it the operator just eyeballed it . On Mon, Apr 15, 2013 at 2:49 PM, Viesturs Lācis <viesturs.la...@gmail.com>wrote: > 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 > -- jeremy youngs ------------------------------------------------------------------------------ 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
