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Coordinate measuring machine and method of measuring therein

  • US 5,434,803 A
  • Filed: 03/23/1993
  • Issued: 07/18/1995
  • Est. Priority Date: 03/26/1992
  • Status: Expired due to Term
First Claim
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1. A coordinate measuring machine wherein a measuring element is brought into contact with a workpiece which is placed on a table to measure the shape of the workpiece, comprising:

  • a data receiving device recording at least one measured value and a measuring direction of the measuring element when the measuring element is brought into contact with a workpiece;

    a shape error calculating device receiving the at least one measured value from the data receiving device and having stored therein a plurality of formulae representing a corresponding plurality of geometric shapes, the shape error calculating device calculating shape errors based on the plurality of formulae and the at least one measured value from the data receiving device;

    a geometric shape determining device for determining a geometric shape of the workpiece based on the number of measured values and amount of shape errors from the plurality of formulae, the geometric shape determining device determining the geometric shape to be a point when the number of measured values is one, the geometric shape determining device comparing the shape errors calculated by said shape error calculating device for at least two geometric shapes when the number of measured values is more than one to determine a temporary geometric shape having the least shape error and determining an optimal geometric shape based on the temporary geometric shape and the measuring direction of the measuring element recorded by the data receiving device when the number of measured values is more than one; and

    a data display device displaying one of the temporary and optimal geometric shapes.

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