Abstract: Machining techniques and machining apparatus are provided for treating workpieces in an efficient and reliable manner. The machining techniques and machining apparatus employ multiple thread whirling heads associated with a single machining assembly, such that each of the thread whirling heads is able to act on a workpiece during a single, uninterrupted machining process. Screw threads may be formed that include first and second thread profiles and an intermediate transition region. The machining apparatus generally includes a processor that is programmed to control operation of the multiple thread whirling heads in a sequential manner.

Abstract: A hole forming apparatus comprises a workpiece transfer mechanism that transfers one unformed workpiece at a time into a workpiece gripper and drives completed workpieces out of the workpiece gripper and onto an exit path. A compound hydro-pneumatic cylinder moves the gripper and one workpiece at a time downward into contact with a rotating forming tool. The forming tool includes a tool adapter head that holds various forming implements such as cutting blades or drill bits. The head also accommodates broachers and reamers, in which case a precision logic control detects and rejects defective workpieces that have no holes to broach or ream. The apparatus may also include a positive stop that prevents workpieces from overshooting the end of a forming stroke.