The CNC whirling machine processing the thread is completed by using multiple forming blades installed on the cutter head to complete the progressive high-speed milling by means of the eccentricity between the rotation center of the cutter head and the center of the workpiece. The axis of rotation of the cutter head needs to be inclined at a helix angle a with respect to the axis of the workpiece.

During processing, the workpiece rotates at a low speed of spindle b, and the cutter head c rotates in the same direction as the workpiece at high speed. The blade cut a lead (feeding motion) for each revolution of the workpiece to cutting the thread.What is the CNC whirling machine working?