Cutter setting calculation for CNC hobbing non-circular gear

Non-circular gears meshing with the characteristics of checkmark, it requires non-circular gears should meshing at the zero line accurately at the beginning of processing. So, there should be a starting point when setting cutter in the processing of non-circular gears. This point can ensure strict position relation between cutter and workpiece. To strictly ensure strict position relation, how to accurately determine the coordinates of the cutter center position is the key problem. How to determine the coordinates of the cutter center position were analyzed when hobbing non-circular gear with CNC gear hobbing machine, and some related formulas was derived. Formulas be derived are not only valid for non-circular gear, but also are applicable to cylindrical gears. It is easy to calculate and determine the coordinates of the cutterl center, and provides theoretical basis for the establishment of library operations in automatic programming system.