Abstract The paper is a critical review of existing methods that permit in situ measurement of large externalcylindrical surfaces. Large size cylindrical elements are used in many industries, e.g. papermaking, metallurgyor shipbuilding. Their diameter can sometimes reach even a few meters and they can be severalmeters long. Such elements should be characterized by high dimensional…
Abstract This study focuses on developing a new error separation technique for the in situ measurement and reconstruction of cylindrical profile. Based on a five-point system proposed, the center vectors of the least squares circle in the cross-sectional profile of the cylinder can are accurately extracted by the error separation model. The vectors are based…
Abstract Preferred commercial methods of measuring the out-of-roundness of aworkpiece are based upon radial methods. These incorporate a very accuratespindle either to carry the transducer or via a table to the workpiece.Consequently they are best operated in a controlled environment such as in aninspection room. However, there is a requirement for measuring the workpiecenear to…
Abstract This paper presents a new multiprobe method for roundness measurements called the mixed method. In this method, displacements at two points on a cylindrical workpiece and an angle at one of the two points are simultaneously monitored by two probes. The differential output of the probes cancels the effect of the spindle error, and…
Abstract A multi-point method for spindle error motion measurement is proposed in the paper. The radial error motion of the spindle is measured by 4 probes, where as the axial and tilt ones by 5 probes. Roundness error and flatness error of the specimens used for measuring the spindle error motions are separated and have…
Abstract A new apparatus for measurement of accuracy of spindle rotation based on three points method has been developed. Making use of the new method, it became possible to detect radial error motion of machine tool spindle even during cutting condition precisely.
Abstract A new method of roundness and spindle error motion measurement is presented in thispaper. Roundness error of the workpiece and radial error motion of the spindle aremeasured simultaneously by using 4 probes mounted with certain angle arrangement. Thismethod gives high accuracy for all harmonics which is difficult for three point method. Basedon error analysis…
Abstract This paper presents an uncertainty analysis for roundness measurements on a glass hemisphere. The measurements were carried out with the spindle measuring instrument Talyrond 73. For the correction of spindle errors, a multi-step error separation technique with ten steps was used. Various input quantities were investigated such as the form deviations of the hemisphere,…
Abstract Results of an intercomparison measurement of sensitivity standards are presented. The standards circulated were a flick and two multi-wave standards (MWS). The measurands were form deviation and, for the MWS only, the height of the dominant spectral components. For the flick, influences from mechanical filtering and calibration are discussed. For the MWS several influencing…
Abstract The calibration of form measurement instruments generally is performed by calibration standards. Current available standards are only restrictedly suited for this purpose. Therefore novel standards have been developed which embody several superimposed sinusoidal waves on a cylindrical surface. It is shown that by their application the calibration of form measurement instruments can be significantly…
Abstract The multistep error separation technique is a high precision measuring technique. It is widely used to measure the radial, axial and composite errors of rotating pick-up roundness measuring instruments, turntable roundness measuring instruments or precision axis systems. The author deals with the problems of measuring accuracy of the multistep method and the determination of…
