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Polar & Cylindrical Interpolation

G12.1 for polar interpolation and G7.1 for cylindrical: which plane each one works in, which axis stands in for the rotary, what is allowed and what is refused while one is active, and how each is cancelled.

Until this page exists, the panel itself is the reference: the screen it describes carries its own labels and softkeys, and the control refuses what it cannot do rather than doing it quietly.