Clough, David A, Fletcher, Simon, Longstaff, Andrew P. and Willoughby, Peter (2012) Practical in-situ calibration method for the non-linear output from a low cost eddy current sensor. In: 37th International Matador Conference, 25th - 27th July 2012, Manchester, England.
Abstract

Increasing demand on manufacturing industry to produce tighter tolerance parts at a consistent rate means it is necessary to gain a greater understanding of machine tool capabilities, error sources and factors affecting asset availability. The machine tool spindle can be a significant contributor to both machine tool errors and failures resulting in a requirement for spindle error measurement.
The use of eddy current non-contact displacement transducers is currently a popular method for measuring spindle error in a manufacturing environment. This is due to their resistance to harsh conditions where dust and coolant may be present. Unfortunately, many eddy current sensors have non-linear outputs that vary with target material and dimension. Typically, adjustments in the signal conditioning are provided to linearise the output, and calibrate the sensors for a specific target material.
It is the purpose of this paper to assess current sensor calibration methods and highlight the potential for error in practical situations. To solve the problem, a method of in-situ calibration is presented, which uses the short range positional accuracy of the machine as a reference and least squares best fit of a low order polynomial. Validation is provided through the use of calibration test results and a practical example.

Library
Documents
[img]
Preview
MianDavid_Clough_MATADOR_conference_paper.pdf - Accepted Version

Download (748kB) | Preview
[img]
David_Clough_MATADOR_conference_paper.docx - Accepted Version
Restricted to Repository staff only

Download (2MB)
Statistics

Downloads

Downloads per month over past year

Add to AnyAdd to TwitterAdd to FacebookAdd to LinkedinAdd to PinterestAdd to Email