Profile of a line with datum reference

[VitorSantiago]

Hello Guys,

In a drawing I took to use with reference, I have a profile of a line with a datum reference to two planes, one of them are several planes with a Common Zone (CZ), well, another is a reference in a diameter dimension. I don't understand how the line will behave with these parameters, how will a reference in a diameter create a plane?

Follow the example;

[pre][/pre]

 

[3DDave]

Is this to ISO requirements? Can't know the game without knowing while rules are used.

 

[cr7]

Because of CZ combined zone (formerly common zone) modifier used, look like ISO GPS.

 

[Belanger]

I'm not sure why you are asking about a plane at the end of your question. Datum B is actually an axis, which can be thought of as two intersecting planes.
The primary datum A creates a plane and the secondary datum B creates an axis (aside -- that 2.4 mm dimension for datum feature B should have a Ø symbol). I would think a tertiary datum is needed here, to support the profile tolerance but also to help locate the datum targets that make up datum A.

Once the datums are established, though, then the profile tolerance simply serves to control the shape and location of that curve (the profile tolerance also needs to be clarified as "between" two points, I suspect).

John-Paul Belanger
Certified Sr. GD&T Professional
Geometric Learning Systems

 

[Woosang]

If I add one more, datum feature B symbol should be associated to 2,4 dimension.

By the way, what does the elongate circle that encircles the 2,4 dimension mean?

 

[Belanger]

I suspect it's what they sometimes call a functional dimension or critical dimension.

John-Paul Belanger
Certified Sr. GD&T Professional
Geometric Learning Systems