PREDETERMINED PROCESSING LENGTH IN A NUMERICALLY CONTROLLED MACHINE TOOL

• US 3,766,368 A
• Filed: 10/21/1971
• Issued: 10/16/1973
• Est. Priority Date: 10/21/1971
• Status: Expired due to Term

• Current Assignee: Dieter Kremper, Fritz Weber, Peter Schiewek
• Original Assignee: Dieter Kremper, Fritz Weber, Peter Schiewek
• Inventors: Weber, Fritz, Schiewek, Peter, Kremper, Dieter
• Primary Examiner(s): Botz, Eugene G.
• Application Number:
  US05/191,161
• Time in Patent Office: 726 Days
• Field of Search: 235/151.11,151.11I,152,92MP,92CT,92CC,92CP 90/24R 318/696,685
• US Class Current: 318/601
• CPC Class Codes: G05B 19/182 characterised by the machine tool function, e.g. thread cutting, cam making, tool direction control G05B19/21 - G05B19/40 take precedence

Abstract

A device for nibble and planing machines for the automatic division of a predetermined processing length in a numerically controlled machine tool wherein the standard step is predetermined from the outside and is not permitted to fall short of a specific value determined by technical requirements comprises a comparison device. A difference circuit supplies a signal representing the remaining processing length (s - x) to the comparison device. A step length counter supplies a signal representing the step length to the comparison device. The comparison device produces an output signal for reducing the step length to divide the remaining processing length into p steps of substantially equal length when the comparison result indicates that the remaining processing length is shorter than p times a longer standard step ( Delta s).

Claims

1. A device for nibble and planing machines for the automatic division of a predetermined processing length in a numerically controlled machine tool wherein the standard step is predetermined from the outside and is not permitted to fall short of a specific value determined by technical requirements, said device comprising comparison means;

difference means for supplying a signal representing the remaining processing length (s - x) to the comparison means;

step length means for supplying a signal representing the step length to the comparison means, said comparison means producing an output signal for reducing the step length to divide the remaining processing length (s - x) into p steps of substantially equal length when said comparison means provides a comparison result which indicates that the remaining processing length (s - x) is shorter than p times a longer standard step ( Delta s).

2. A device as claimed in claim 1, wherein the comparison means produces an output signal when the comparison result indicates that the remaining processing length (s - x) is shorter than four standard steps.

3. A device as claimed in claim 1, wherein the difference means comprises a processing length datum-pilot difference counter producing a zero signal at the end of the processing length and a register connected to the comparison means, said difference counter transferring a signal indicating the remaining processing length to the register after each step, and the step length means comprises a step length counter connected to the comparison means.

4. A device as claimed in claim 3, wherein the difference counter comprises a reverse counter.

5. A device as claimed in claim 3, wherein the dividing means includes means for preventing the transfer of a signal from the difference counter to the register of the difference means when the step length is shortened.