What exactly is this implying? I've seen a profile composite to ABC and A, ABC and AB, but not A and A. PCDMIS seems to be calculating it but I can't make sense of it.
If I had to guess, .004 to A and .002 form only while still pinned to datum A.
The argument could be made that the secondary frame is establishing error from left side to right side (or vice versa) once the right side existed. I've never seen that on a position, but technically, it is allowed.
If this was holes, they have a position of .004 to datum A (generally akin to perpindicular) and all the holes must be within .002 of each other while still perpendicular to datum A.
So, sort of, if those two sides are 120° apart, one side must be 30° off of datum A within an angularity of .004, while the other side must match the first at 120° within an angularity of .002. Sort of, you can't substitute angularity for profile of a surface, but that's the concept.
I've never seen it done that way with profile (surface or line), and I don't like the look of it. I am used to the primary having more degrees of freedom controlled and then the secondary only to A.
I would personally ask what they (customer's receiving inspection and engineering) are wanting done, explain what I think they are asking for, and explain I've never actually seen it done outside of the standard itself so I want to try and match their inspection and give them what they want/need.
If I had to guess, .004 to A and .002 form only while still pinned to datum A.
The argument could be made that the secondary frame is establishing error from left side to right side (or vice versa) once the right side existed. I've never seen that on a position, but technically, it is allowed.
If this was holes, they have a position of .004 to datum A (generally akin to perpindicular) and all the holes must be within .002 of each other while still perpendicular to datum A.
So, sort of, if those two sides are 120° apart, one side must be 30° off of datum A within an angularity of .004, while the other side must match the first at 120° within an angularity of .002. Sort of, you can't substitute angularity for profile of a surface, but that's the concept.
I've never seen it done that way with profile (surface or line), and I don't like the look of it. I am used to the primary having more degrees of freedom controlled and then the secondary only to A.
I would personally ask what they (customer's receiving inspection and engineering) are wanting done, explain what I think they are asking for, and explain I've never actually seen it done outside of the standard itself so I want to try and match their inspection and give them what they want/need.
