Method for measuring accuracy of thread groove and system for the same
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United States of America Patent
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Oct 5, 1993
Grant Date -
N/A
app pub date -
Nov 9, 1990
filing date -
Nov 9, 1989
priority date (Note) -
Expired
status (Latency Note)
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Abstract
In measuring the accuracy of a thread groove of a ball thread formed in a nut by using an electric micrometer, a displacement of one point on each of a pair of flanks of the thread groove is measured along a longitudinal direction of the thread groove, and a pair of measured data sequences are obtained respectively for the pair of flanks. The data elements of the pair of measured data sequences are grouped into a plurality of groups so that each group includes a pair of data elements which are respectively contained in the pair of measured data sequences and which are corresponding to each other. The accuracy in the depth direction of the thread groove with respect to a reference thread groove is obtained on the basis of a sum of the data elements in each group, and the accuracy in the thread axis direction is obtained on the basis of a difference between the data elements in each pair.
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