Sample G-Code
From PROBOTIX :: wiki
Square-Circle Test: Creates a 4in square folled by a 4in circle inside of the square. This is the code that we use to calibrate the machines.
% G54 G90 G20 G0 G64 P0.01 M3 S1 G0 X0 Y2 G1 Z0 F150 Y0 X4 Y4 X0 Y2 G3 I2.0 G0 Z1 M5 X0 Y0 M30 %