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  1. RyanD1978

    Datum Order - Am I correct?

    Thanks pmarc, That is a great example. I kept looking for one in my ETI 14.5-2009 hand book, but had a hard time finding anything similar.
  2. RyanD1978

    Datum Order - Am I correct?

    I tried to simplify the problem and drew the previous image. I didn't think about the datums C and B actually being planar. That was my mistake. This image reflects the actual drawing in question more accurately. Does the order of datums referenced, still not make a difference?
  3. RyanD1978

    Datum Order - Am I correct?

    I'm just going to keep whining now [glasses] This site mentions primary datum having 3 points (ie a plane). Link to original site Link
  4. RyanD1978

    Datum Order - Am I correct?

    I started working with a new group, and they use a different GD&T datum order than I feel is correct. I am used to the primary datum being listed as the flat plane (example 1), and the secondary datums placing the object/feature in said plane. They use the planar datum as the tertiary datum...

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