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Method of digitizing a profile locus

  • US 4,746,251 A
  • Filed: 01/23/1986
  • Issued: 05/24/1988
  • Est. Priority Date: 05/24/1985
  • Status: Expired due to Fees
First Claim
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1. In a profiling method for performing NC working on the basis of locus data obtained by profiling a shape of a model by a stylus in a profiling machine, a method of digitizing profile locus data comprising steps of:

  • rounding position data of a surface of the model, obtained by adding a position signal of the profiling machine and a displacement signal from a tracer head, at each sampling time upon profiling operation by means of a low-pass filter having a changeable time constant; and

    automatically changing the time constant of said filter in response to a rate of change of the shape of the model, wherein the time constant of said filter is decreased when the rate of change of the shape of the model increases.

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