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Thread: Physical height calculation of RA surface finishes.

  1. #1
    Associate Engineer
    Join Date
    Sep 2017

    Physical height calculation of RA surface finishes.

    Ra or RMS surface finishes are computed by the profilometer as root mean square results.
    Does anyone know a source for the physical height of the " peak to valley " that is being represented as Ra?
    I am sure there is a math formula for this but my search has not discovered it. Just the formulae would be good, but a calculator would be awsome :-)... TIA

  2. #2
    Technical Fellow Kelly_Bramble's Avatar
    Join Date
    Feb 2011
    Bold Springs, GA
    Tell me and I forget. Teach me and I remember. Involve me and I learn.

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