Improving the accuracy of roundness measurement – D. G. Chetwynd and G. J. Siddall

Abstract The application of error separation techniques to roundness measuring instruments is investigated
experimentally, using digital computers. The accuracy of such techniques is substantiated by comparative
measurements with two independent multi-orientation systems. Results obtained with these and other systems
confirm that the errors of conventional roundness measuring instruments can be reduced by a factor of ten or more and
meaningful polar graphs obtained at radial magnifications of up to one million. These advances in accuracy can be
achieved in relatively poor working environments and with little extra skill on the part of the instrument operator.