Hey all, I've recently updated to PCDMIS 2020 R2, and the dialog for True Position is throwing me for a loop. The results I'm getting do not correlate to manual calculation based off measured basic dimensions, and I can't figure out where I'm going wrong. It may be in the definition of the Datums based on the part print, but here's where I'm at.

positionillustration.png

This is a really basic illustration of my part and the defined datums. I'm using an iterative alignment defined as follows: A plane of Z1-Z3, which are not coplanar. Rotation between hole X and a circle constructed to the width of slot Y, and an origin at the center of hole X.

My first thought is that based on these features, the callout should actually read: [0.6|Z|X|Y] instead of X,Y,Z, as in every other print I've used, the first letter is A and A is always the datum defined as a plane.

From there, I'm pretty lost as to what is going wrong.

I have attempted defining the datums as X being the circle constructed to define Datum X, Y as the slot, the circle constructed to the width of the slot, and a line between X and Y, and Z as a plane constructed from the points created at Z1, Z2, and Z3.

Any assistance is appreciated, and please let me know if you need more info.

Again, this is a rough illustration, the actual part is not perfectly flat and has a lot of organic bends in it making Z1 and Z3 almost coplanar, and Z2 nowhere near coplanar to Z1 and Z3.

positionillustration.png

This is a really basic illustration of my part and the defined datums. I'm using an iterative alignment defined as follows: A plane of Z1-Z3, which are not coplanar. Rotation between hole X and a circle constructed to the width of slot Y, and an origin at the center of hole X.

My first thought is that based on these features, the callout should actually read: [0.6|Z|X|Y] instead of X,Y,Z, as in every other print I've used, the first letter is A and A is always the datum defined as a plane.

From there, I'm pretty lost as to what is going wrong.

I have attempted defining the datums as X being the circle constructed to define Datum X, Y as the slot, the circle constructed to the width of the slot, and a line between X and Y, and Z as a plane constructed from the points created at Z1, Z2, and Z3.

Any assistance is appreciated, and please let me know if you need more info.

Again, this is a rough illustration, the actual part is not perfectly flat and has a lot of organic bends in it making Z1 and Z3 almost coplanar, and Z2 nowhere near coplanar to Z1 and Z3.

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