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GD&T Question

How do I use the basic [4.39] with total run-out or do I somehow add it with the concentricity? I am lost with how to measure the 4.39". I can do it with a true position but that is not an option here.


Parents
  • I have been informed today that "Basic dimensions can be used with profile, position, and runout too." I was asked to review some books.
  • Your 4.39 BASIC is tied back to the right hand side, where there is no datum. As already stated here, unless there is something stated in a note or on the print elsewhere, that basic dim should be connected to a datum feature with a corresponding geometric control somewhere on the print. The statement that you were given "Basic dimensions can be used..." is an attempt to circumvent the issue that this print is incomplete as we have been presented it here.

    As kingsld says, there is also nothing wrong with enhancing your GD&T knowledge on company time.
Reply
  • Your 4.39 BASIC is tied back to the right hand side, where there is no datum. As already stated here, unless there is something stated in a note or on the print elsewhere, that basic dim should be connected to a datum feature with a corresponding geometric control somewhere on the print. The statement that you were given "Basic dimensions can be used..." is an attempt to circumvent the issue that this print is incomplete as we have been presented it here.

    As kingsld says, there is also nothing wrong with enhancing your GD&T knowledge on company time.
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