A CNC program module based on polar coordinate system

Polar coordinate system is more effective for rotational axes than Cartesian coordinate one. But most commercial motion control cards do not support the polar coordinate, so this paper presents a program module based on polar coordinate system, which can be integrated into computer numeric control (CNC) controller based on motion control cards. To access the module, a special G code is developed. The module is implemented on a custom-made CNC controller and used to machine a class of watch parts. The experimental results show that the module is effective and easy to use.