MEASUREMENT OF DIAMETER AND ROUNDNESS DEVIATION FOR CIRCLE WITH INCOMPLETE CONTOUR

Bartosz Gapinski, Andrzej Kolodziej

Abstract

Shafts and holes are the most common elements in the construction of machines. Their mating creates the sets for various purposes, but in most cases these elements create responsible couplings, e.g. mating surfaces with the bearing friction, surfaces of mounting bearings, positioning dowels of elements, pair of piston – cylinder, etc. Control of circle parameters - outside ones on a shaft or internal ones in a hole, is one of the most common tasks in metrology of geometrical quantities.<BR />Measurement of diameter and roundness deviation could be conducted using wide range of measuring devices in dependence on tolerances of particular characteristic. In most cases, the measurement is carried out on a complete contour. However, there are some cases when the measurement needs to be done for incomplete contour – it can be the value of 180° or 45°.<BR />The aim of this paper is to present the recommendations for proper definition and interpretation of the results for the parameters achieved from the measurement of incomplete contour. Presented results of measurement of diameter and roundness deviation on a specialized form tester were related to different angular lengths. Measurement objects had various form errors. The influence of position of the measuring sector in relation to extremum (minimum and maximum) of roundness was considered. Analysis of measuring accuracy and also the impact of verification of measuring sector length on a loss of information on the measured object was conducted.

Keywords

diameter measurement, form deviation, roundness, accuracy of measurement, uncertainty

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DOI

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IMEKO TC

TC14 - Measurement of Geometrical Quantities

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