Shunmugam, “Fitting of robust reference surface based on least absolute deviations
- J.M.S. Kumar
- Precision Engineering,
− Accurate measurement of irregularities of the geometrical surface structure requires mathematical definition of relevant reference surface, which is called according to the newest terminology, an associated surface. Such surface is the reference feature in relation to which appropriate surface parameters are calculated. When measuring cylindricity deviations, the least squares or minimum zone cylinders have been mostly used as associated features. However, an ideal cylinder cannot be employed as an associated feature when measured elements are not nominally cylindrical but for example barrelor saddle-shaped. The paper presents mathematical model of calculation of the associated feature for elements whose generatrix is the fragment of a circle and results of the experimental verification of developed concept.