Abstract: A compact mechanism for producing simultaneous rotary and linear motion for a machine tool includes a drive shaft having a spline race and helical race coextensive over at least a portion of its length. The compact mechanism includes a first motor coupled to a screw engaging the helical race for imparting linear motion on the drive shaft. The compact mechanism also includes a second motor coupled to a spline engaging the spline race for imparting rotary motion on the drive shaft. By operating the motors simultaneously but independently, a wide range of linear movement is obtained.

Abstract: A tapping attachment for a machine having at least one rotating workpiece spindle and associated coaxial tool drive shaft. The tapping attachment couples a tapping tool to the drive shaft in a manner selectively controlling the tool to rotate with respect to a workpiece attached at one of two predetermined velocities in the same direction as the spindle. The attachment is selectively adapted so that one of the two velocities is above and the other below that of the spindle.