CNC Program example code with drawing to show how an arc can be milled on a cnc milling machine.

G02 Circular interpolation Clockwise with I & J is used for arc machining.

## G2 Circular Interpolation CW

G2 X... Y... I... J...

Parameter | Description |
---|---|

X | Coordinates of the arc end point in x-axis. |

Y | Coordinates of the arc end point in y-axis. |

I | Distance from arc start-point to arc-center-point in X-axis. |

J | Distance from arc start-point to arc-center-point in Y-axis. |

## Program Example

G0 X0 Y0 (P1) G1 X0 Y-1.493 F... (P2) X1.939 (P3) G2 X1.5 Y-2.5 I1.061 J-1.061 (P4) G1 X0 (P5)

## G2 I & J Calculation Method

The image below shows how I & J values are calculated for Arc machining with G2 circular interpolation.