Hello Forum,
i guess there must be an on/off switch for this in MACH4 but I don't know where.

This code should generate a rectangle:
(60.3, 65.3)
G90
G91.1
G00 X37.5 Y42.2
M3
G01 X37.5 Y44.7 F1500
G03 X35.0 Y47.2 I-2.5 J0.0
G01 X22.8 Y47.2
G01 X22.8 Y22.8
G01 X47.2 Y22.8
G01 X47.2 Y47.2
G01 X35.0 Y47.2
G03 X32.5 Y44.7 I0.0 J-2.5
M5
G00 X32.5 Y65.3
M3
G01 X32.5 Y62.8
G03 X35.0 Y60.3 I2.5 J0.0
G01 X60.3 Y60.3
G01 X60.3 Y9.7
G01 X9.7 Y9.7
G01 X9.7 Y60.3
G01 X35.0 Y60.3
G03 X37.5 Y62.8 I0.0 J2.5
M5
M30

MACH4 shows the correct preview, but when i start the programm in every one of the four corners the laser travels on an arc that is not in the NC-Code.

So I have a rectangle with rounded corners.