G33 Spindle Synchronized Motion on LinuxCNC based DIY Lathe

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Describing the G33 cycle on LinuxCNC based machines. It allows to synchronize the spindle with 1, 2 or even 3 linear axis. This gives the possiblity to machine threads on bar stock or even drill-like patterns on cones using a CNC lathe. I'm not sure for what purpose could be used the 3rd axis here - maybe you have any idea?