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Method for machine tool and profilometer coordinate registration

  • US 6,970,766 B2
  • Filed: 04/23/2004
  • Issued: 11/29/2005
  • Est. Priority Date: 04/23/2004
  • Status: Expired due to Fees
First Claim
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1. A method for registering machine tool and profilometer coordinates, said machine tool defining a C-axis having a zero position, said method comprising the steps of:

  • loading a sacrificial workpiece into the machine tool;

    cutting several first features in a surface of the sacrificial workpiece and producing a linear machine tool motion across the workpiece;

    determining the centroid of each first cut feature;

    fitting a line to said centroids of said first cut features;

    measuring angle θ

    0 of said line relative to the C-axis zero position;

    moving the machine tool to a fixed radius;

    cutting several second features in a surface of the sacrificial workpiece and producing a circular machine tool motion across the workpiece;

    determining the centroid of each second cut feature;

    fitting a circle to said centroids of said second cut features; and

    determining a center of the circle, said center being the machine tool center in profilometer coordinates.

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