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GD&T: modifiers on datums

uncharted
First off I just want to say that I am new to this forum and somewhat new to PCDmis. This is completely different from what I was use to.
I want to say up front please forgive me if I do not understand what you are talking about which may lead me to ask more questions with what answer you post.

I will make this short and sweet. I have 2 questions.

First question
Can a person place a modifier on a primary datum? I am using xactmeasure. It will allow me but I was told by my supervisor that it was not allowed. Is this correct?

Second question
A print calls out for a modifier on the secondary datum but that datum is a constructed line. Xactmeasure will not allow me to add a modifier, I'm assuming since it is not a feature of size. Does that mean I need to tell them they cannot use a modifier for that particular datum or is there some way I can manipulate from a line to something else to get the modifier added?

Thanks to all who reply.
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  • Modifiers can only be applied on features of size regardless if it is a datum or a feature measured. Points, lines and planes are not features of size and therefore modifiers cannot be applied on them. The rotation is not a factor in modifiers. If you have plane, circle, circle (primary, secondary, tertiary) for you datum set, you can apply the modifier on the secondary and tertiary datum even though the rotation goes to secondary and tertiary datum, but you cannot apply modifier to the primary datum because it is not a feature of size. If you have plane, line, point, no modifiers can be applied on datum because non of the features are of size.

    +1
Reply
  • Modifiers can only be applied on features of size regardless if it is a datum or a feature measured. Points, lines and planes are not features of size and therefore modifiers cannot be applied on them. The rotation is not a factor in modifiers. If you have plane, circle, circle (primary, secondary, tertiary) for you datum set, you can apply the modifier on the secondary and tertiary datum even though the rotation goes to secondary and tertiary datum, but you cannot apply modifier to the primary datum because it is not a feature of size. If you have plane, line, point, no modifiers can be applied on datum because non of the features are of size.

    +1
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