On 11/3/2011 12:21 AM, Tom Easterday wrote: > On Nov 2, 2011, at 5:50 PM, Jon Elson wrote: > >> On 11/02/2011 12:07 PM, Tom Easterday wrote: >> >>> Pleas tell me how you home an axis with 2 joints to an index pulse? >>> >>> >>> >> The way commercial machines like big gantry boring mills do it is they >> have a swivel joint in the gantry. So, each tower of the gantry can move >> independently without any binding. The beam across the gantry has a swivel >> at one end, and a slotted bearing at the other. They may have limit >> switches >> on the slotted bearing so if the machine gets seriously out of square, it >> trips the E-stop. In this manner, the two linear joints can move relatively >> together toward home, and then each homes to its own home switch >> and index pulse. Once homed, then the CNC program always keeps >> them parallel. >> > I would like to see a picture or video, that sounds interesting. But, let me > me rephrase my question… > > Using gantrykins with a gantry that cannot be out of square more than about > 3/4", how can we home the 2-jointed Y axis? > > We cannot move in World Mode before homing. We cannot move in Joint Mode > without racking. We cannot understand how to select one encoder to find > index pulse on. Can we home to one of the two index pulses or is this > impossible? > > -Tom > > > > Did you throw in the towel on the hard stop homing with the drives??
Dave ------------------------------------------------------------------------------ RSA(R) Conference 2012 Save $700 by Nov 18 Register now http://p.sf.net/sfu/rsa-sfdev2dev1 _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
