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For 1, do you have a M3 $0 S1 command at the beginning of your cut?

For 2, this would probably work:
linuxcnc.org/docs/devel/html/plasma/qtpl...c.html#plasma:keep_z then you could just zero Z at the correct height and use a g0 or g1 z0 to send it back at the beginning of each cut.

For 3, why not just use M1? I think it’s still valid in QtPlasmaC. Use the move to Z0, then M1, then do your pierce and press cycle start? ¯\_(ツ)_/¯ I also have almost zero experience with CNC oxyfuel tables.

jimmyrig wrote:

Most printers are made of 80x20, which while it works in the short term, fails slowly over time. Bolts come loose, pom wheels (that ride in the 80x20) wear out, belts loose tension, etc.

You probably mean 8020 alu, the profile is mostly 20x20 and rarely 20x40.