Laser scanning method and apparatus for rapid precision measurem

Details Laser scanning method and apparatus for rapid precision measurem Laser scanning method and apparatus for rapid precision measurem

1996-02-05

1998-01-27

Pham, Hoa Q.

Optics: measuring and testing

By configuration comparison

With comparison to master, desired shape, or reference voltage

356376, G01B 1124

Patent

active

057127069

ABSTRACT:
A non-contact laser-based sensor guided by a precision mechanical system scans a thread form producing a set of digitized images of the thread form. The digitized images are analyzed to derive quantitative information about thread characteristics such as pitch, lead, root radius, flank angle, surface roughness, helix variation, and pitch diameter. Thread form data may be stored and later retrieved in order to provide traceability and verification of thread form measurements to a predetermined thread form specification. The apparatus and method of the invention can measure characteristics for shapes similar to threads, such as gears and dies used for cold forming processes. The thread measurement system can be mounted on thread making machines and used for on-line monitoring and control of the thread forming process.

REFERENCES:
patent: 3918816 (1975-11-01), Foster et al.
patent: 4315688 (1982-02-01), Pryor
patent: 4544268 (1985-10-01), Yamada et al.
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patent: 4598998 (1986-07-01), Kamei et al.
patent: 4644394 (1987-02-01), Reeves
patent: 4717240 (1988-01-01), Gilby
patent: 4721388 (1988-01-01), Takagi et al.
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patent: 4746792 (1988-05-01), Dil
Chapter 12 of the Handbook of Dimensional Measurement by Francis T. Farago, entitled "Screw Threads And Screw-Thread Measuring", Fifth Printing 1982, pp. 311-340.
Article entitled "Analysis and Solution of the Nongeneric Total Least Squares Problem" by S. Hussel and J. Vandewalle in SIAM of Anal. Appl. vol. 9 No. 3, Jul. 1988, p. 360.

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