Can I omit Basic dimensions?

[bc23]

My drawings are created (& read) in 3D format (MBD). I read an article that basic dimensions can be omitted in MBD; the main advantage being shorter dimensioning time. I only know 2 situations where basic dimensions are required:
(a) for designer's information (to track changes or apply in calculations etc),
(b) for CMM application

Does anyone know of other conditions which would utilize basic dimensions?
Does ASME have any rules regarding omission of basic dimensions?
Note that since I have provided the drawing in MBD, any unknown dimension can be checked from the 3D.
Hope to understand what I'm missing.

 

[greenimi]

Note that since I have provided the drawing in MBD

So, if it is MBD then why you need a drawing for? What exactly you are showing on your "drawing" ?

 

[greenimi]

And Y14.5-2018 states

5.1.1.2 Basic Dimensions. Basic dimensions shall beindicated on the orthographic views or in the model in one of the following ways:
(a) applying the basic dimension symbol to each basic dimension. See Figure 10-1, illustrations (a) and (b).

(b) specifying on the drawing (or in a document referenced on the drawing) a general note such as “UNTOLERANCED DIMENSIONS ARE BASIC.”
See Figure 10-1, illustration (c). NOTE: When using this method, a plus/minus tolerance is not allowed via a general tolerance block or notes.

(c) implied basic dimensions of 0° and 90°. See paras. 4.1(k) and 4.1(l).

(d) specifying and querying basic dimensions on models. See ASME Y14.41.

 

[ctopher]

I agree, look up ASME Y14.41.
MBD still uses basic dims.
You can create 3D PDF showing the MBD views and notes for vendors/customers.

 

[3DDave]

This is really a question for the recipient and user of the drawing/model.

Can they use what you are producing or not?

It is a little confusing to refer to a model as a drawing.

 

[ctopher]

3DDave It is a little confusing to refer to a model as a drawing.

Haha. I hear this all the time! It is confusing.

 

[ewh]

In MBD there is often a default profile tolerance applied to un-dimensioned features, simplifying the model by only dimensioning items that have a non-default tolerance. These datums/features do need to be defined with basic dimensions (or a note as mentioned above) and applicable FCFs. This applies in the absence of actual drawings or if the drawing only consists of non-orthogonal model views. YMMV