Igor, All the names of axes are symbols used to facilitate conversation/use between people and machines. The axes can be named anything you want. By normal convention the A axis is the axis that the centerline of rotation is parallel with the X axis. A revolves around X and B revolves around Y and C revolves around Z. The gcode program needs matched to what the symbols are. The direction of axis motion is also arbritrary. There is no 'standard' although there is what most people call normal. The gcode needs matched to the chosen directions. Stuart
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