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Method for improving measurement accuracy of a protable coordinate measurement machine

  • US 20040111908A1
  • Filed: 08/15/2003
  • Published: 06/17/2004
  • Est. Priority Date: 02/14/2002
  • Status: Active Grant
First Claim
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1. A method for improving the measurement accuracy of a portable coordinate measurement machine (CMM) which measures the position of an object in a selected volume, the CMM including a manually positionable articulated arm having opposed first and second ends, said arm including a plurality of joints, a measurement probe attached to a first end of said articulated arm and an electronic circuit which receives the position signals from transducers in said arm and which provides a digital coordinate corresponding to the position of the probe in a selected volume comprising:

  • sensing deformation of a portion of said articulated arm when said arm is placed under a load, said deformation causing an error in the measurement made by the CMM; and

    correcting said error in response to said deformation.

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