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In this article, we write CNC program example for rotational and linear copy commands (G72.1 and G72.2 codes) in CNC Milling machines.

Programming Notes

Specifying two or more commands to copy a figure;

  • G72.1 cannot be specified more than once in a subprogram for making a rotational copy (If this is attempted, alarm PS0900 will occur).
  • G72.2 cannot be specified more than once in a subprogram for making a linear copy (If this is attempted, alarm PS0901 will occur).
  • In a subprogram that specifies rotational copy, however, linear copy can be specified. Similarly, in a subprogram that specifies linear copy, rotational copy can be specified.

Technical Drawing

 

Fanuc G72.1 G72.2 Figure Copy Program Example (Bolt Hole Circle)

CNC Program

Main program

O4000 ;
N10 G90 G00 G17 X240. Y230. Z100. ; (P0)
N20 G72.1 P4100 X120. Y120. L8 R45. ;
N30 G80 G00 X240. Y230. ; (P0)
N40 M30 ;

Sub program – Rotation copy (G72.1)

O4100 N100 G72.2 P4200 I0 J20. L3 ;
N200 M99 ;

Sub program – Linear copy (G72.2)

O4200 N110 G90 G81 X120. Y180. R60. Z10. F200. ; (P1)
N210 M99 ;

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