Dimensioning a symmetric feature_Need of half dimensions 1

[Bux1986]

Hi,

This may be a very trivial question but do we have to always or at least a good idea to show the half dimension of a symmetric feature?
Is there any part of ASME standard that described this?
If it is then lot of half dimensions have to be added to drawing and what would be the tolerance of the half dimensions?

Please see attached picture.

My take is centerline should be enough and no need to show half dimensions.

Please help to clear my confusion. Thanks

Picture:

https://files.engineering.com/getfi...c6ba-4045-b1e0-8c4f4c92604a&file=halfDim1.PNG

 

[greenimi]

No attached picture.
Maybe 4-39/ ASME Y14.5-2009 or 7-4 could be used for reference

 

[Bux1986]

https://files.engineering.com/getfi...c6ba-4045-b1e0-8c4f4c92604a&file=halfDim1.PNG

Picture attached.

Thanks, Greenimi. Please let me know your thoughts.

 

[greenimi]

If a position control is to be added to .375 width wrt the appropriate DRF then I think you don't need .188 dimension.
About .101 versus .048 I am not sure what .048 dimensions means.
What feature .048 is trying to define?

Also not very sure where .724 is pointing to?

 

[Wuzhee]

Why would anyone clutter the drawings with half dimensions?
This is one main advantage of a symmetrical part. You can dimension from the center axis. No need to show a half dimension of a feature when there's a center axis. It is implied default that the part is symmetrical.

This looks like a shaft coupling or something. You definitely don't need the .188 and .362. The .048 is another story, because that feature is not in the direction of the symmetry so if there's like a step in the model, you should chose another view angle for better understanding.

 

[Burunduk]

No need for those half dimensions