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General Mach Discussion / Z axis moves up 2 inches after I start G code start cycle

« on: May 18, 2012, 12:23:23 PM »

When I Z zero my CNC using auto zero with plate and start cycle Z axis jumps 2 inches higher than normal and air cuts. When I Z zero manually by jogging to surface of material machine works as normal. I'm using mach 3 control software.
can Anyone help me with this issue?  I checked offset screen to make sure my gage block info is correct.