As a part of my research work. i have obtained some machined surface using vertical milling and turning process. I want to check whether the predicted roughness and obtained roughness(Ra) are same. For Ra measurement in periodic surface the sampling and evaluation length need to set in stylus profilometer. According to iso-4288:1996 estimated Rsm value is required to select sampling and evaluation length for periodic profile. i didn't know to estimate RSm.
ISO definition of RSm is, to put it mildly, misleading. See:
- Leach, R. K. and Harris, P. M., Ambiguities in the definition of spacing parameters, Meas. Sci. Technol. 13, (2002)
- Scott, P. J., The case of surface texture parameter RSm, Meas. Sci. Technol. 17 (2006)
Attached file shows how important surface features are ignored by such definition. If you want to follow the standard just adopt your best estimation of the period of your surface as a starting point.
Thank you very much for suggestion sir@ Luiz Alberto Pereira das Neves Franco
You can read this paper
Scott, P. J., The case of surface texture parameter RSm, Meas. Sci. Technol. 17 (2006)
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