This paper describes the design and implementation of a gage for measuring the wall thickness of hot rolled steel tubing at an actual production facility. The design is based upon a statistical analysis of the tube samples, and upon the economic realities of mill operating conditions. Issues relating to time constraints, uneven sample preparation, a mill operating environment, and differences between gage operators are addressed. The gage records more data from the tubes than could be taken manually, and therefore allows the accompanying software to apply unique algorithms for the calculation of hexing and eccentricity in each sample. All results are recorded and stored in a database for continuous use in statistical process control.

J. B.
The Abbe Principle Revisited-An Updated Interpretation
Precision Engineering
, Vol.
, No.
, pp.
, 1989.
Devor, R. E., Chang, T., and Sutherland, J. W., Statistical Quality Design and Control, Macmillan Publishing Company, New York, NY, 1992.
Dorf, R. C, Modern Control Engineering, Addison-Wesley Publishing Company, Inc., Reading, MA, 6th. Ed., 1992.
Hoffman, J. D., Numerical Methods for Engineers and Scientists, McGraw-Hill Publishing Company, Inc., New York, NY, 1992.
Jayaraman, V., and Raja, J., “A Simple and Effective Method to Account for Tilt and Eccentricity in Roundness Measurements,” Proceedings of American Society for Precision Engineering 1994 Annual Meeting, pp. 141–4, 1994.
Slocum, A. H., Precision Machine Design, Prentice Hall, Englewood Cliffs, NJ, 1992.
Smith, R. J., and Dorf, R. C., Circuits, Devices, and Systems, John Wiley and Sons, Inc., New York, NY, 5th. Ed., 1992.
You do not currently have access to this content.