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Thread: Material Modifier GD&T

  1. #1
    Associate Engineer
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    Material Modifier GD&T

    I have an interview question which was asked to one of my colleague and I couldn't get it clearly. So posting it here. Hoping to get a clear idea of what it is.

    The Question was asked liked this " The tolerance value is 0 to 0.1 mm so what could be the material modifier value".

    I need help to understand this.

    Rajiv.
    Last edited by Kelly Bramble; 03-16-2016 at 08:00 AM.

  2. #2
    Administrator Kelly Bramble's Avatar
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    MMC or MMB, Maximum Material Condition or Maximum Material Boundary.

    or

    0 at MMC with a feature of size variable spread of 0.1

    Somebody needs to study or get GD&T training... GD&T = Geometric Dimensioning and Tolerancing
    Last edited by Kelly Bramble; 03-16-2016 at 07:22 AM.
    Tell me and I forget. Teach me and I remember. Involve me and I learn.

  3. #3
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    Hi Kelly,

    Thanks for your response..

    I understand that it's related to GD&T and I've been trained up to intermediate level.

    But I never came across this kind of a question. May be it was asked in a different way.

    You mean to say material modifier value will be 0 for his question. He has not mentioned about the feature whether it will be for a hole or a shaft anything like that. That's where I got confused.

  4. #4
    Administrator Kelly Bramble's Avatar
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    Quote Originally Posted by Rajiv View Post
    You mean to say material modifier value will be 0 for his question. He has not mentioned about the feature whether it will be for a hole or a shaft anything like that. That's where I got confused.
    Yes, that's what I'm suggesting..

    Of course the question is not totally clear without an example...
    Tell me and I forget. Teach me and I remember. Involve me and I learn.

  5. #5
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    It means that the given GD&T number on the print would be shown as a zero. But due to the modifier (most likely the circled M, called MMC, but it could also be the circled L, called LMC), the GD&T value may grow to be more than the given zero tolerance. The source of this growth is the size tolerance on that feature.

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