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General Mach Discussion / Z axis retract

« on: August 15, 2009, 05:36:21 AM »

I have a small cnc router and after I home 0,0,0  and start a program the z axis retracts to 0.7874 and when the program is finished it retracts to the same 0.7874. This is not a problem until I use a long tool, or thick work piece thern the z axis runs to the end of the screw  and stalls. How do you change the retract value?