Abstract An instrument has been developed which can measure not only radius of curvature but also form deviation and surface texture at the same time. A computer is used to mathematically separate the form from the texture. The technique can be applied to the measurement of cross track curvature of bearing raceways and to other…
AbstractSome applications in the field of surface metrology are described for a new stylus instrument incorporating a transducer with a wide dynamic range.The transducer has a range of 2.0 mm and a resolution of 5 nm enabling the measurement of both the fine surface texture and the surface form of ahighly formed component to be…
AbstractIn stylus measurements of surface texture the measured results for roughness depend on the stylus radius. Therefore it is important to determine the stylus radius. Since stylus tips are not perfectly spherical, the local radius of curvature varies significantly over the surface which makes thedetermination of an effective radius difficult. Both the techniques used to…
Abstract An appraisal is given of the qualities of diamond styli which are used for surface texture measurement. Some of the difficulties encountered in normal optical and electron optical methods of assessment are discussed, and a possible solution which involves a two-stage replica process isdescribed.
Early developments of stylus instrument for surface profile measurements are documented in this paper. R.E reason is the father of M system/Mean line system for surface profile analysis
Surface-measuring instruments and the factors limiting their performance are studied. For comparison between instruments, the ability to measure sinusoidal perturbations of varying amplitude or wavelength can be used.
Random process analysis is now widely used for analysing surface profiles. This technique has certain limitations which are brought about by the loss of phase information. This loss, under certain circumstances, can cause difficulties in the interpretation of surface structure. This paper deals with a different method of examining the structure, namely, complex demodulation which…
A new approach to roughness filtering is described using digital filters designed and simulated in a general purpose computer. The filters were used to process the digitized surface profiles and the performance is compared with that of available analogue filters.
An essential preliminary to numerical assessment of roughness is the elimination of waviness. The waviness is usually filtered using analog filters of the capacitance-resistance type. This paper deals with a digital technique to remove the waviness. FFT, one of the important tools of digital signal processing was used to filter surface profiles. This technique was…
This paper deals with the application of finite Fourier series to analyse the surface profiles. A good approximation could be obtained using only a fraction of the maximum number of harmonics. The criteria to fix the fraction is dealt with in detail and this will enable us to find out the optimal degree to which…
Precise and accurate control of surface texture is increasingly important to product performance in advancing technology. Success depends upon personnel who have a thorough knowledge of the limitations of existing methodology as well as the broad perspective necessary to evaluate factors in terms of company goals. Credos for engineers, manufacturers and quality personnel are given…
Summary of research.
