Form Error Characterisation by an Optical Profiler |
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Authors: | Ganesha Udupa BKA Ngoi |
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Affiliation: | (1) Precision Engineering Laboratory, School of Mechanical and Production Engineering, Nanyang Technological University, Nanyang, Singapore, SG |
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Abstract: | Form errors are deviations of the machined surface from the geometrical surface excluding position errors, waviness and roughness.
From a functional point of view, as for surface roughness, form error characterisation is also important. In the present work,
an optical profiler is used to measure and numerically characterise form errors such as roundness and cylindricity of cylindrical
surfaces. A double orientation method using mean value analysis has been applied to separate the workpiece error from the
spindle error during roundness measurement. Software is developed for data generation, fitting the reference data for assessing
form errors in terms of statistical and functional parameters including new parameters. An optical profiler measures all the
surface irregularities and hence can be used to study both micro and macro errors of the profile measured. A study of both
roughness and roundness parameters along the circumferential direction is made for the unfiltered signal using different filter
cut-off values. It is known that filtering greatly affects the value of the form error parameters measured. The form measurements
obtained by the optical profiler are compared with the stylus profiler and the results are presented. |
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Keywords: | :Filtering effects Numerial characterisation Optical profiler Roundness and cylindricity measurement |
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