Geometrical instruments – Gauge – Screw thread
Patent
1995-03-24
1996-11-05
Fulton, Christopher W.
Geometrical instruments
Gauge
Screw thread
33503, 73162, G01B 5008
Patent
active
055712223
ABSTRACT:
A process for measuring characteristic values and fundamental quantities of tapered thread using the one-ball or two-ball measuring method is disclosed. The process is used, in particular, on coordinate measurement devices with a device table which is movable in at least two coordinate axes and with a measurable relative movement between the device table and a measuring feeler. After calibrating the measuring feeler by means of a calibrating ring, the test piece is clamped on a table which is adjusted in such a way that a first flank diameter line 11 of the tapered thread is aligned vertically to the surface of the device table. The thread of the test piece is then sensed in a plurality of Z coordinates. The measurement data recorded in so doing are fed to an evaluating device. In an additional process step, the table is adjusted in such a way that a second flank diameter line located diametrically opposite the first flank diameter line extends vertically to the surface of the device table and the thread is contacted. The measurement data determined in this way are also fed to the evaluating device and stored therein. The characteristic values and fundamental quantities to be determined are calculated from the sum of measurement data collected.
REFERENCES:
patent: 2321903 (1943-06-01), Fox
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patent: 4389785 (1983-06-01), Goldsmith et al.
patent: 4986003 (1991-01-01), DoCarmo
patent: 5207097 (1993-05-01), Gutman
patent: 5396712 (1995-03-01), Herzog
H. Zill, "Messen und Lehren", B. G. Teubner Verlagsgesellschaft, Leipzig, 1956, pp. 183-184 (No Month).
W. Langsdorff, "Messen von Gewinden" Springs-Verlag, Berlin, 1974, pp. 69-74 (No Month).
"Witworth-Rohrgewinde fur Gerwinderohre und Fittings", Jul. 1983.
"Metrisches kegeliges Auss engewinde", Apr. 1971.
Carl Zeiss Jena GmbH
Fulton Christopher W.
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