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So i am using the post processor MACH3 Plasma. The issue i am having is the pierce delay changes in the g-code from the setting i have on the machine tools. For instance i set a 1.3s pierce delay to cut 3/8 plate and it will change back to .5s see the attached tap file. see lines 160, 230, 280, 350 etc. Why is this happening? I attached the tap file and the post processor for reference.

I'm not seeing any issue in the code. If you look in the tap file you should see this code: Try changing the pierce delay to 0. After post processing you should see the G04 value change to 0. Is the pierce delay still 0.5s? If so I suspect you have a spindle on delay defined in Mach4

I vaguely remember some strangeness in the way Mach4 handles delays. After doing the above check, try the attached post.