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Thread: Calculate Ra

  1. #1
    Associate Engineer
    Join Date
    Mar 2018
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    1

    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?

    R_a.txt

  2. #2
    Administrator Kelly Bramble's Avatar
    Join Date
    Feb 2011
    Location
    Bold Springs, GA
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    2,237
    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
    Posts
    4
    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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