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Method and device for robot tool frame calibration

  • US 6,044,308 A
  • Filed: 06/13/1997
  • Issued: 03/28/2000
  • Est. Priority Date: 06/13/1997
  • Status: Expired due to Fees
First Claim
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1. A method for calibration of pose of a tool center point (TCP) of a robot controlled tool with respect to a tool sensor means, the robot controlled tool being attached at an end-point of said robot, and the tool sensor means being affixed to the end-point of the robot and spaced from the robot controlled tool, comprising:

  • a) providing a reference fixture with at least four topographically defined features, said reference fixture having a preselected first pose with respect to a robot frame of reference, providing a TCP sensor means in a preselected second pose with respect to said reference fixture for sensing position of said tool center point;

    b(i) positioning said tool sensor means so that said reference fixture is in a field of view of said tool sensor means,b(ii) calculating a pose of said robot end point with respect to said robot frame of reference,b(iii) calculating a pose of said reference fixture with respect to said tool sensor means from a sensed position of said four topographically defined features of said reference fixture,b(iv) calculating a position of said tool center point with respect to said reference fixture from a sensed position of said tool center point with respect to said TCP sensor means; and

    c) calculating a position of said tool center point with respect to said tool sensor means and said robot end-point from said first and second poses and said poses calculated in steps b(ii) and b(iii) and the calculated tool center point position in step b(iv).

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