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That’s all you really need to know! Read on if you’re interested in the details.īriefly, G28 is used to return the cutter-head to the home position.

If omitted, your job might be unexpectedly scaled to a weird size. It sets units to Metric or Imperial, for example. I do not recommend deleting the entire six-line preamble! It sets up various values in Mach 3’s brain, and omitting them may be give unexpected results.

This option also controls some related codes at the end of the file. Then open the Properties pane and un-check useG28. It turns out that there’s a simple solution: Click post process to create the gcode. I reverse-engineered the codes in the preamble, but all seemed to be perfectly valid Mach 3 g-code. I was curious about this and decided to investigate. Rama figured out that manually editing the gcode and removing the first six lines gets around the issue. The gcode emitted by Fusion 360 using the default settings does not work on our big CNC.