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Thread: Calculate Ra

  1. #1
    Associate Engineer
    Join Date
    Mar 2018

    Calculate Ra

    Hi, I am trying to calculate the Ra in the correct way. At the moment I use an external software which calculates it, but I want to do it by own calculation. I have a pointcloud, what was taken bij a sensor 500 points/mm. Points can be found at the link underneath. The columns are x, y, z, i, j, k. The external software gives me a 0.90 Ra. The traditional Ra method Ra=1/L (abs Z) gets me an Ra of 1.3?
    Could someone help me with this topic?


  2. #2
    Technical Fellow Kelly_Bramble's Avatar
    Join Date
    Feb 2011
    Bold Springs, GA
    The equations or the data actually read by the two methods are different..
    Tell me and I forget. Teach me and I remember. Involve me and I learn.

  3. #3
    Associate Engineer
    Join Date
    Dec 2017
    Simplify the data to not more than ten data points and compare the results. I'll bet Kelly is right about the data or equations used.

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