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Thread: True position and concentricity composite tolerance

  1. #1
    Associate Engineer
    Join Date
    Apr 2016
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    2

    True position and concentricity composite tolerance

    This is a requirement on a drawing sent by one of my customers. What I don't understand is the concentricity part of it. Any help would be appreciated. Thanks.
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  2. #2
    Technical Fellow Kelly_Bramble's Avatar
    Join Date
    Feb 2011
    Location
    Bold Springs, GA
    Posts
    2,615
    It's undefined - Concentricity requires a datum.

    If the specification was Position - it would control the coaxiality of the 2 hole features to one another.
    Tell me and I forget. Teach me and I remember. Involve me and I learn.

  3. #3
    Associate Engineer
    Join Date
    Apr 2016
    Posts
    2
    Thanks Kelly. I'll request a print revision to eliminate or change the concentricity requirement from my customer.

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