For each successive workpiece operation to be performed by a numerical control machine, the operator selects an available one of a family of full and undersized cutters and, by actuation of a corresponding console switch, causes a programmed tape to be scanned and appropriately positioned to provide a matching program for use with the selected cutter. Circuit logic set up in response to actuation of the switch prevents starting of the numerical control machining until the matching program is in the starting position on the program reader. For each operation there is a family of full sized cutter having a tool code identification T-01 and undersized cutters having tool code identifications T-02 to T-04, respectively. The programmed tape has recorded thereon for each operation, a sequence of programs, there being one program for each cutter size of the family of cutter sizes for that program. Each program includes the dimensional instructions for its cutter size together with the Tcode identification of the cutter size. The programs for each family of cutter sizes and the families of programs for the sequence of machine operations are all recorded on the single tape in uninterrupted sequence thereon. There is one console selector switch for each of the full and undersized cutters in the family of cutters, and actuation of any one permits the tape scanning operation to begin upon actuation of a ''''SCAN'''' switch. An ''''ON-OFF'''' console switch provides for bypass of the selector switch operation to permit scanning of uncoded tapes. The T-code identification of the selected cutter and the T-code identification of the corresponding program positioned at the program reader are visually indicated.

Numerical control machining apparatus programmed for families of cutter sizes

Supplied with driving energy, a digital servo system drives a controlled member with inevitable droop and produces an alarm signal representing whether or not the droop is within a predetermined range. A control pulse generator produces control pulses when the droop is within the range. A reversible counter accumulates an instantaneous number of command pulses supplied to the system in compliance with the sign indicated by a direction command signal also supplied to the system. The control pulses, when produced, reduce the number towards zero. In compliance with the absolute value of the number, the counter adjusts the energy.

Digital servo comprising means for controlling driving energy in response to droop

A numerical machine tool control system is provided wherein command information is given in the form of digital words representative of end point coordinates to which the machine tool is expected to move within predetermined identical increments of time, as opposed to the present system which provides command information together with a feedrate.

Kiyokazu Okamoto

Papers

Numerical machine tool with polyphase position detector with means selecting particular phase and means preventing excessive lag

Numerically controlled servomechanism including position offset