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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.
Parents
  • To answer the questions regarding the legality of the specific callouts on your print I think we would need to see the print, or at least a sketch showing the callout and the the types of features to which it is applied on the print.

    In general, as has been stated above:

    1) Modifier on a primary datum feature of size = No problem
    2) Modifier on something that is not a feature of size= problem both in legality and in application in PCDMIS

    Pre-2013 versions required that you do a workaround in some situations to create a FOS that was valid in the software. You would simply dimension the distance, assign this value to a variable, and then construct a circle using this variable as the diameter input. This method is described in detail in several previous posts on this forum. Here is one:

    http://www.pcdmisforum.com/showthread.php?23200-Calculate-MMC-for-any-feature

    This isn't addressing datum shift specifically but should give you some ideas about how you might attempt to work around things that seem to be roadblocks in the software.

    Version 2013 and later has a new feature called "Constructed Width" that was added to address this type of situation.
Reply
  • To answer the questions regarding the legality of the specific callouts on your print I think we would need to see the print, or at least a sketch showing the callout and the the types of features to which it is applied on the print.

    In general, as has been stated above:

    1) Modifier on a primary datum feature of size = No problem
    2) Modifier on something that is not a feature of size= problem both in legality and in application in PCDMIS

    Pre-2013 versions required that you do a workaround in some situations to create a FOS that was valid in the software. You would simply dimension the distance, assign this value to a variable, and then construct a circle using this variable as the diameter input. This method is described in detail in several previous posts on this forum. Here is one:

    http://www.pcdmisforum.com/showthread.php?23200-Calculate-MMC-for-any-feature

    This isn't addressing datum shift specifically but should give you some ideas about how you might attempt to work around things that seem to be roadblocks in the software.

    Version 2013 and later has a new feature called "Constructed Width" that was added to address this type of situation.
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