method and device for measuring the thickness of round and elongated in the direction of its longitudinal axis and advanced workpieces with arbitrary and changing winkellage

摘要

The method involves measuring simultaneously the thickness of the workpiece. Three measurement system s (x,y,z), which are pivoted in common about the longitudinal axis of the workpiece (22b), measure its thickness (d1,d2,d3) along the measurement axes (principal and minor axes) over a specific pivoting angle range. The three measurement are offset from one another by a small angle. A computer determines maximum or minimum values for the values measured. The measurement system is then pivoted into a position (measurement zero position) in which on the measurement axis of the middle measurement system (principal axis) a minimum or a maximum value results. Using a computer algorithm the relationship between the three measurements of the three systems is determined. Then the amount by which the angular position of the maximum or minimum has changed and how great the maximum or minimum is in the changed angular position, is calculated and in which direction of rotation the change in the angular position has taken place