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.

Numerically controlled servomechanism including position offset

Numerically controlled servomechanism including position offset

Citations

Numerical control machining apparatus programmed for families of cutter sizes

References

Automatic control apparatus

Numerically controlled positioning system

Discrete signal electrical positioning control system

Selective zero electrical control system

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