Patent ID: 6925850
Filing Date: 2005-08-09
Classification: B23Q,G01B,G05B

Abstract:
1. A method for calibrating movement of a machine member about a rotary axis, comprising the steps of: (a) mounting a calibration device to said member for rotation relative thereto; (b) detecting a reference orientation of said calibration device when said member is in a first position, said calibration device forming a first position angle relative to said member when said member is in said first position and said calibration device is in said reference orientation; (c) selecting a commanded position of said member; (d) detecting a difference between said commanded position and said first position to obtain a commanded angle; (e) moving said member towards said commanded position until said member reaches a second position; (f) moving said calibration device until said calibration device is near said reference orientation, said calibration device forming a second position angle relative to said member when said member is in said second position and said calibration device is near said reference orientation; (g) detecting a difference between said first and second position angles to obtain a displacement angle; and, (h) comparing said commanded angle to said displacement angle to obtain an offset angle; characterized in that movement of said calibration device is a function of said orientation thereof.