Discussion
The preparatory functions in Computer Numerical Controlled (CNC) machine programing are denoted by the alphabet
Answer: A
Preparatory functions are denoted by G.
In CNC part programming, G-codes are the preparatory functions that set the mode of motion and machining, for example G00 rapid positioning, G01 linear interpolation, G02 and G03 circular interpolation, G90 absolute and G91 incremental coordinates.
M-codes are miscellaneous functions such as spindle on (M03), coolant on (M08) and program end (M30). O introduces the program number, and P is used for parameters such as dwell time or a subprogram number. None of these is the preparatory function.
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