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Machine capability verification and diagnostics (CAP/DIA) system, method and computer program product

  • US 6,721,675 B1
  • Filed: 03/10/2003
  • Issued: 04/13/2004
  • Est. Priority Date: 01/31/2003
  • Status: Expired due to Fees
First Claim
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1. A method for calibrating a machine having a base, a movable element, which is movable relative to the base in reference to an axis, and a control system for numerically controlling movement of the movable element in reference to the axis along a predetermined distance, the method comprising:

  • identifying a plurality (N+1) of predetermined spaced-apart positions (i) along the predetermined distance, each of the positions (i) being associated with a desired position (DPr,i) and spaced apart by a distance of L, the desired position (DPr,i) being representative of a desired location of the movable element in the predetermined distance;

    moving the movable element to each of the predetermined positions (i) in a first direction and calculating an error (Er,i) between the desired position (DPr,i) and an actual position (APr,i) of the movable element relative to the base and in reference to the axis at each of the predetermined positions (i);

    translating the structure to each of the predetermined positions (i) in a second direction opposite the first direction and calculating error (Er+1,i) between the desired position (DPr+1,i) and an actual position (APr+1,i) of the movable element relative to the base and in reference to the axis at each of the predetermined positions (i);

    repeating the above two steps a predetermined number (R/2) of times; and

    determining an average cumulative positioning error per unit length (m) based upon an average of the differentials (Er,i) and (Er+1,i) at each of the predetermined positions (i) and an amount by which the movable element is moved relative to the base.

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