Interactive Resource icon  Surface Quality: Roughness

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Description: Out of all the surface condition criteria, Ra and Rt (expressed in μm) are often used to characterise the roughness of machined surfaces. Rt is the total roughness (maximum depth or amplitude of the roughness), while Ra is the arithmetic roughness (mean arithmetic deviation from the mean line of the roughness). The mean line is defined as a condition when the area above the line is equal to the area below the line. The exercise illustrates all these definitions, drag the lien to measure the arithmetic roughness.
Keywords: roughness • surface condition
Categories: Materials > Metals & alloys > Aluminium & alloys
Processes > Shaping > Machining
Properties > Mechanical & thermal > Surface properties
Created by: Benoît Verquin, CETIM
Jean Saint-Chely, CETIM
Cheryl Anderson, The University of Liverpool
MATTER, The University of Liverpool
Contributions: Marc Ryckeboer, Sapa
Bernard Marandet, ALCAN Centre de Recherches de Voreppe
Published by: European Aluminium Association, Brussels
License: This resource is released under the Creative Commons Attribution Non-Commercial No Derivatives license (2.0 UK: England & Wales).
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Date created: 29 April 2004
Date added: 29 July 2010
Resource ID: 3149