Scope 1.1 This test method covers measuring the surface finish of powder metallurgy (PM) products at all stages of manufacturing from green compact to fully hardened finished component. 1.2 This test method provides the definition and schematic of some common surface finish parameters (Ra, Rt, and Rz ISO) 1.3 The values stated in inch-pound units are to be…
This SAE Recommended Practice describes a method for measuring roughness average (R\da) and Peak count (PC) of the surface of cold-rolled steel sheet. The method includes a system for equipment configuration, calibration, and procedures for determining average surface roughness, R\da (\gm or \gmin), and average peak count, PC (peaks per cm or peaks per inch)…
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.
The ZEISS Academy Metrology supports technicians, quality lab leaders, and anyone responsible for precise measurement. Trainings include Geometry Inspection, 3D Digitalization, Freeform Measurement, etc.
Training focuses on how metrology can help you do your job. Classes include, “An Introduction to Surface Texture” and, “An Introduction to Roundness.” We also develop specialized training topics at the customers’ requests.
Come Together is aimed at metrologists, designers, manufacturing engineers, and anyone who wants to understand the topic of surface metrology. Come Together brings the professional knowledge of surface metrology within the company to a common, stable, and technically competent level.
Abstract Engineering surfaces are comprised of a range of spatial wavelengths. Filtering techniques are commonly adopted to separate the different wavelength components into well-defined bandwidths. Filtering is done prior to numerical characterization and it is also essential for extracting information needed to provide process feedback and establish functional correlation. This paper reviews commonly used filters…
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…
