Hilfe bei der korrekten Definition der Ausrichtung von Bezug C

[[St...]]

Hallo zusammen,

ich befinde mich derzeit in einer Diskussion mit der Fertigung bezüglich der Definition meines Bezugs C.
Der Außendurchmesser dient als Bezug A.
Ich habe Bezug C als 3D-Gerade über die außenliegenden Bohrungen definiert und diesen als Verdrehungsbezug verwendet.
Der Fertigungsleiter ist jedoch der Meinung, dass dies nicht korrekt ist und die Ausrichtung über eine einzelne Bohrung erfolgen muss – also die 3D-Gerade zwischen einer Bohrung und Bezug A herzustellen ist.

Wer hat in diesem Fall recht?

Anbei ein Ausschnitt aus der Zeichnung.

 

 

Hello everyone,

I am currently in a discussion with the manufacturing department regarding the definition of my datum C.
The outer diameter serves as datum A.
I have defined datum C as a 3D line based on the outer holes and used it as a rotational reference.
However, the production manager believes that this is incorrect and that the alignment must be established using a single hole – meaning the 3D line should be created between one hole and datum A.

Who is correct in this case?

Attached is an excerpt from the drawing.

[[Ma...]]

I believe this drawing is wrong. You can not place datums on axis. You can not tell which axis it is. Center of 1 hole, center of outer diameter ( part ).

If they want to have C as one of the holes for screws, then they should place it there, or define it as C1 and C2.

[[Jo...]]

As Martin allready mentioned, the drawing is not distinct on how the datum ist meant to be build.

Maybe the section view A-A gives more information on this.

 

The datum should be in aligment with how the part is fixed during production and of course how it is used in the assembly. Sometimes you can make sense of non distinct drawings with those considerations.

Or you ask your customer ...

Edited yesterday at 01:21 PM

[[St...]]

Okay, thanks for the helpful answers. In section A-A, nothing is defined for my datum C, so I created an axis through the two holes.