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General Mach Discussion / Reference/limit switch for A-axis (4th axis)

« on: March 12, 2009, 06:39:18 AM »

Hi, I am presently familiarizing myself with Mach3 (Demo Version).  I have a home built portal type milling machine.  In order to cut letters I activated the 4th axis (rotational) for a tangential knife.  The setup works fine with one exception:  At the end of cutting a letter the stepper does not return the knife to its original position.  Homing the machine has no result on the 4th Axis.  I can only reset the knife position manually because the axis does not activate a reference switch.  
My question:  is a reference switch required? If yes, where is the switch physically installed? Or is it controlled by software? If yes, where do I find this software?

Best Regards Karl