 A basic square with rads is as follows:Some rules first I is incremental X, J is incremental Y and K is incremental Z. You wont really use K much on milling. When using I and J they give the center of the arc from the END of the rad. Easy on rads of 90 degree or 180 degree but some working out is needed when coming away at other angles. Assuming center of square is X0. Y0. and always climb milling! G0 X0. Y0. G1 Z-50. F100 G1 X100. Y0. Y80. G03 X80. Y100. I0. J-20.(ANTI CLOCKWISE) G1 X-80. G03 X-100. Y80. I20. J0. G1 Y-80. G03 Y-100. X-80. I0. J20. G1 X80. G03 X100. Y-80. I-20. J0. G1 Y0. X0. G0 Z100. With program using R values G0 X0. Y0. G1 Z-50. F100 X100. Y80. ( PUT G41 HERE FOR USING CUTTER COMP) G03 X80. Y100. R20. G1 X-80. G03 X-100. Y80. R20. G1 Y-80. G03 X-80. Y-100. R20. G1 X80. G03 X100. Y-80. R20. G1 Y0. X0. ( PUT G40 HERE TO CANCEL COMP) G0 Z100. Using I and J gives you a much more accurate radius as using an R value can do some strange things, especially if you are doing an angle that is not 90 or 180 degrees and you have not worked out your exit point correctly. | 
