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.
Jon ------------------------------------------------------------------------------ RSA(R) Conference 2012 Save $700 by Nov 18 Register now http://p.sf.net/sfu/rsa-sfdev2dev1 _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
