Programming on any particular machine tool requires knowing which method that machine uses. Many lathes do not use M06 because the T address itself indexes the turret. The M03 direction is always M03 regardless of local vantage point and local CW/CCW distinction. Right-hand-helix screws moving in the tightening direction (and right-hand-helix flutes spinning in the cutting direction) are defined as moving in the M03 direction, and are labeled "clockwise" by convention. The right-hand rule can be used to determine which direction is clockwise and which direction is counter-clockwise. The speed of the spindle is determined by the address S, in either revolutions per minute (G97 mode default) or surface feet per minute or meters per minute (G96 mode under either G20 or G21). See M30 for additional discussion of control status upon executing M02 or M30. Many modern controls treat M02 as equivalent to M30. M02 was the original program-end code, now considered obsolete, but still supported for backward compatibility. Program ends execution may or may not return to program top (depending on the control) may or may not reset register values. Machine only stops at M01 if operator pushes the optional stop button. Non-optional-machine always stops on reaching M00 in the program execution.
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