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General Mach Discussion / Cannot Jog After Reset

« on: April 06, 2010, 12:52:41 AM »

I am using a Romaxx CNC machine with Mach 3 and 2 parallel ports creating a closed system.  When I first start Mach 3 I am having a problem with the step jog not working even after reset.  I have found that if I hit the 'stop' button or 'Alt-S', then everything works fine from there on out.  It's almost as if Mach 3 thinks there is some G-code running and wants it stopped before continuing.  Strangely the continuous jog and MPG jog work OK all the time.  When the step jog quits working, it is also impossible to zero any axis until the reset button is hit followed by Alt-S or Stop.  Has anyone else had this experience, and if so what did you do to fix it.

Many Thanks!