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Absolute diameter measurement arm

  • US 9,157,723 B2
  • Filed: 11/18/2013
  • Issued: 10/13/2015
  • Est. Priority Date: 01/30/2009
  • Status: Expired due to Fees
First Claim
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1. A method of determining absolute diameter of an object on a rotary table, comprising:

  • having an assembly formed of (i) a rotary table on a base, and (ii) a support tower on the base and carrying a horizontal measurement arm with a measurement probe end, tracking the measurement probe end of the horizontal measurement arm to obtain a position in three-dimensional space of the measurement probe end of the horizontal measurement arm;

    using the horizontal measurement arm, measuring a plurality of points around a circumference of a subject object on the rotary table;

    for each measured point, determining a respective corrected point by applying a measurement arm correction to the measured point, the measurement arm correction being based on the tracked and obtained position of the measurement probe end of the measurement arm; and

    applying the determined corrected points in a multi-point polygon model and determining absolute diameter of the subject object.

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