A method for detecting alignment deviation on a thread-measuring instrument

Alignment deviation is an important factor affecting measurement accuracy in screw thread measurement. It needs to be detected and controlled to ensure the accuracy of relative thread parameters. The influence on pitch diameter caused by the alignment deviations of workpiece and probe is analyzed in...

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Bibliographic Details
Published in:Measurement science & technology 2013-08, Vol.24 (8), p.85002-1-9
Main Authors: Chen, Sheng, Zhao, Dongbiao, Lu, Yonghua, Liu, Kai
Format: Article
Language:English
Subjects:
Alignment
alignment deviation
Corners
Deviation
Mathematical analysis
measurement
Repeatability
Reproducibility
screw thread
Tracking
vision detection
Workpieces
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Summary:Alignment deviation is an important factor affecting measurement accuracy in screw thread measurement. It needs to be detected and controlled to ensure the accuracy of relative thread parameters. The influence on pitch diameter caused by the alignment deviations of workpiece and probe is analyzed in this paper. In order to detect and control the alignment deviation, a vision detection method for the probe tip points is proposed, which integrates the detection of corners and edges and the prediction of motion. Then the X-axial rotation deviation is calculated by tracking the tip points both up and down. The result of tests demonstrates that the detection accuracy of the X-axial rotation deviation is 0.0654° with the background changing during the probe movement. The repeatability of the test procedure is ±0.16%, which proves the detection method is adequately qualified for application.
ISSN:0957-0233
1361-6501
DOI:10.1088/0957-0233/24/8/085002