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Method of optimizing the operation of a computer controlled machine tool

  • US 4,208,718 A
  • Filed: 06/05/1978
  • Issued: 06/17/1980
  • Est. Priority Date: 06/05/1978
  • Status: Expired due to Term
First Claim
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1. A method of optimizing the cutting operation of a machine tool, which includes a motor driven rotary cutter carrying spindle that is adapted to be fed relative to a workpiece at varying rates for performing a cutting operation on the workpiece,said method comprising the steps of:

  • (a) Selecting a programmed spindle speed for said spindle;

    (b) Selecting a target horsepower for said cutting tool;

    (c) Calculating a target excitation current for said spindle motor which will produce the selected horsepower at said cutting tool at the selected spindle speed;

    (d) Measuring the actual excitation current of the spindle motor while said cutting tool is cutting said workpiece at a programmed feed rate;

    (e) Calculating the feed rate change which is required to produce the target excitation current in the spindle motor;

    (f) Changing said first feed rate by the amount calculated in step (e); and

    (g) Periodically repeating steps (d) through (f) while said cutting tool is cutting said workpiece.

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