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lwestlake1-Visitor
1-Visitor
June 17, 2015
Solved

How to make a hole pattern a datum reference for GD&T?

  • June 17, 2015
  • 3 replies
  • 9760 views

I want to make my hole pattern datum C and reference it in a feature control frame. How do I do that in Creo?


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Best answer by RonSt.Pierre

David,

In all due respect, it is the axis of the pattern, not an axis of one hole of the pattern, as I understand y14.5 1994

Ron

3 replies

L
lwestlake1-VisitorAuthor
1-Visitor
June 17, 2015

I should say, how do I attach a datum tag to a hole pattern...

D
dschenken1-Visitor
1-Visitor
June 17, 2015

A datum reference symbol is typically attached to the diameter dimension of the holes in a pattern. Create an axis through one of the holes (never use an axis that's part of a feature unless you want to make things more difficult) and then choose "IN DIMENSION" or whatever is right for the version of PTC software you are using.

    R
    RonSt.Pierre12-AmethystAnswer
    12-Amethyst
    June 17, 2015

    David,

    In all due respect, it is the axis of the pattern, not an axis of one hole of the pattern, as I understand y14.5 1994

    Ron

      L
      lwestlake1-VisitorAuthor
      1-Visitor
      June 17, 2015

      When you use a hole pattern as a datum it establishes 2 mutually perpendicular planes at the center of the pattern ...and since I'm locating the pattern to a datum plane that keeps it from rotating.  I just wanted to know how to create the datum tag in Creo and I figured it out by trying the suggestions given here.  Thank you!  I'll probably be visiting this forum more often!

      Thanks for all the quick responses.

      Lori

      Dale_Rosema
      23-Emerald III
      Dale_Rosema23-Emerald III
      23-Emerald III
      June 18, 2015

      Don't forget to mark an answer as correct, even if it is your own, so that those following behind will know that an answer has been found.

      L
      lwestlake1-VisitorAuthor
      1-Visitor
      June 18, 2015

      My pattern happened to have been 2 holes so I created a datum plane thru each holes' axis and named it "C".  Then as David said I chose "IN DIMENSION" and attached it to the 2X dia. dimension of the hole I am calling out on the drawing.  Because the datum tag is attached to a 2X dimension - this indicates the pattern is the datum.

      Cheers!

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