In a system which interrupts the infeed signal generated by a CNC (1) machine drive signals are applied to at least an RPM Control Electronics Module (3) to drive the rotation of a cutting tool (10) and the infeed drive motor electronics (7). The frequency is user selectable and the frequency used to eliminate or minimize chip formation is dependent upon the material being drilled, the infeed rate, the RPM of the tool (10), and the diameter and point geometry of the tool (10) so adjustment by the machine operator is required. The interrupted or chopped signal causes the downward motion of the RPM motor (5) to be interrupted in conformance with the frequency generated to cut forming spiral chips.