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Thread: How to convert Ra readings

  1. #1
    Associate Engineer
    Join Date
    Nov 2011
    Posts
    1

    How to convert Ra readings

    Hello,
    I have a machining surface finish requirement of 125 and my surface finish tester only reads in Ra or Rz.
    Is there a conversion from Ra? My tester states the finish is .225Ra is this equal to or better than 125?
    Is there a website or conversion formula? Can you show me how?

    Please help.

    You can contact me at --- removed email
    Last edited by Kelly Bramble; 11-10-2011 at 12:50 PM.

  2. #2
    Administrator Kelly Bramble's Avatar
    Join Date
    Feb 2011
    Location
    Bold Springs, GA
    Posts
    2,495
    Welcome to Engineers Edge!

    See:

    Surface finish review

    and

    Surface Roughness Conversion - towards the bottom.

  3. #3
    Technical Fellow
    Join Date
    Feb 2011
    Posts
    1,043
    Betcha he does not come back to see that assistance Kelly. If they leave an email the lazy sods expect us to follow up with them for their work. Good luck with that lazy-people.

    I worry about the quality of Engineering people the Colleges are turning out these days. Bad enough we have few to none of the artisan-type machinists that can actually use a manual lathe or mill.

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