Int. J. Metrol. Qual. Eng.
Volume 7, Number 2, 2016
|Number of page(s)||10|
|Published online||06 June 2016|
Uncertainty evaluation method for axi-symmetric measurement machines
University of Bath, North East Somerset,
Accepted: 11 April 2016
This paper describes a method of uncertainty evaluation for axi-symmetric measurement machines. Specialized measuring machines for the inspection of axisymmetric components enable the measurement of properties such as roundness (radial runout), axial runout and coning. These machines typically consist of a rotary table and a number of contact measurement probes located on slideways. Sources of uncertainty include the probe calibration process, probe repeatability, probe alignment, geometric errors in the rotary table, the dimensional stability of the structure holding the probes and form errors in the reference hemisphere which is used to calibrate the system. The generic method is described and an evaluation of an industrial machine is described as a worked example. Expanded uncertainties, at 95% confidence, were then calculated for the measurement of; radial runout (1.2 μm with a plunger probe or 1.7 μm with a lever probe); axial runout (1.2 μm with a plunger probe or 1.5 μm with a lever probe); and coning/swash (0.44 arcseconds with a plunger probe or 0.60 arcseconds with a lever probe).
Key words: Axi-symmetric measurement / runout / axial runout / radial runout
© EDP Sciences 2016
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