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Method for improving measurement accuracy of a portable coordinate measurement machine

  • US 6,996,912 B2
  • Filed: 09/09/2004
  • Issued: 02/14/2006
  • Est. Priority Date: 02/14/2002
  • Status: Expired
First Claim
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1. 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 at least five rotary joints such that said articulated arm has at least five degrees of freedom, 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:

  • means for 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

    means for correcting said error in response to said deformation.

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