Incremental motion encoder: a sensor for the integrated condition monitoring of rolling element bearings in machine tools

Kayode A. Ayandokun; P. A. Orton; Nasser Sherkat; Peter D. Thomas; Janet F. Poliakoff

doi:10.1117/12.228857

22 December 1995 Incremental motion encoder: a sensor for the integrated condition monitoring of rolling element bearings in machine tools

Kayode A. Ayandokun, P. A. Orton, Nasser Sherkat, Peter D. Thomas, Janet F. Poliakoff

Author Affiliations +

Proceedings Volume 2595, Machine Tool, In-Line, and Robot Sensors and Controls; (1995) https://doi.org/10.1117/12.228857
Event: Photonics East '95, 1995, Philadelphia, PA, United States

Abstract

Modern industry increasingly demands that machine tools operate continuously as elements within computer integrated manufacturing cells. Accurate monitoring of machine condition is the key to predicting failures that would result in quality defects or costly unplanned production stoppages. This paper presents research into the use of a novel rotary motion sensor for the condition monitoring of rolling element bearings. This sensor, the incremental motion encoder (IME), is based upon a patented development of the optical encoder commonly used in machine tools for sensing angular position and rotational speed. The IME combines these measurements with that of shaft center position in two dimensions. This motion of the shaft center is directly related to the condition of the bearings supporting the shaft. To illustrate the IME principle experimental results showing the ability of the sensor to distinguish between bearing defects and external sources of vibration are presented. Measurement of shaft loading with the sensor is also described. Currently machine tool condition is most often measured by external sensors, such as accelerometers or acoustic emission transducers, which are not parts of the machine itself. The IME is ideally suited to being designed into a machine tool so as to integrate a condition monitoring facility into the computer control of the machine. The paper concludes by describing the current technology which allows sensors based on the IME principle to be integrated directly into rolling element bearings for this purpose.

Citation Download Citation

Kayode A. Ayandokun, P. A. Orton, Nasser Sherkat, Peter D. Thomas, and Janet F. Poliakoff "Incremental motion encoder: a sensor for the integrated condition monitoring of rolling element bearings in machine tools", Proc. SPIE 2595, Machine Tool, In-Line, and Robot Sensors and Controls, (22 December 1995); https://doi.org/10.1117/12.228857

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