A new process that allows simultaneous turning and whirling was developed to reduce production time of screws and thread geometries by machining. The parallelization of turning and whirling and the subsequent increase in efficiency is not possible with conventional whirl-ing because of the slow rotational speed of the workpiece.
Adjusting the process kinematics through synchronization of tool and workpiece rotation allows increasing the workpiece speed significantly. Furthermore the already favorable condi-tions of tool engagement known for conventional whirling are further improved.
The production time of bone screws can be shortened considerably by parallelization and increased feed rate possible due to the improved cutting conditions.