A roundness measuring system is being developed at the NationalPhysical Laboratory (NPL) for assessing X-ray mirrors and other axisymmetricsurfaces to an accuracy approaching 1 nm. Spindle error contributesto measured radial displacement, and analyses in two and in three dimensionsshow that three and all six respectively of the kinematic componentsof error are involved. Experimental data obtained…
Abstract This paper presents a new error separation method for accurate roundness measurement called the orthogonal mixed method. This method uses the information of one displacement probe and one angle probe to separate roundness error from spindle error. This method was developed from the mixed method, which uses the information of two displacement probes and…
Abstract: A primary roundness measurement is independent of any standard due to the application of errorseparation techniques, and it is based on a complete characterization of all relevant influence quantities. Thedescribed roundness tester at METAS is based on a commercial instrument, but has undergone several modificationsin order to achieve highest roundness measurement accuracy. It is…
Abstract. An international comparison of roundness measurements at the highest level of accuracy has beencarried out between eight European laboratories. Three roundness standards with different designs and roundnessdeviations were measured. One standard was a commercially available type, two standards were developed for thepurpose of this comparison. The agreement between the laboratories was within +/-20nm for…
Abstract This paper presents a new multiprobe method for roundness measurementscalled the mixed method. In this method, displacements at two points on acylindrical workpiece and an angle at one of the two points are simultaneouslymonitored by two probes. The differential output of the probes cancelsthe effect of the spindle error, and deconvolving the differential datayields…
Abstract The main types of roundness measuring used in industrial countries are considered. A mountable roundness measuring gauge made by a precision machine-tool plant in St. Petersburg is compared with those types.
AbstractRoundness measurement is critical in manufacturing, as it ensures that products conform to precise designspecifications. However, traditional multistep measurements for roundness error separation are time-consuming andlimited in their ability to separate specific Fourier components. In this study, we propose a novel combined multistepmeasurement method with prime numbers that overcomes these limitations. We demonstrate this method…
Abstract Measurement plays a key role in human’s life. Without measurement there will be no human life environment. Engineering science and technologies with their applications based on measurement, allow for decision of the development of our civilization. The role of metrology is constantly increasing, especially in such fields as industry, energy, transportation, education, health, agriculture…
Abstract Some of the finer points to be taken into consideration when accurately calibrating surface texture and roundness measuring instruments are discussed. Consideration is given to such things as stylus condition, linearity, range switching accuracy, frequency response, and overall sensitivity. The paper concludes with a brief account of an experiment to determine roundness errors to…
Abstract The most popular methods applied to measure cylindricity are the radial methods. These methods are characterized by a high metrological level. The disadvantage, however, is that they can be used mainly for objects with small dimensions, and the measurement is carried out under laboratory conditions. Producers need methods that would enable in situ measurement…
A technical report on basics of roundess measurement
