Proper composite callout for this?

[ronj100]

Is this the correct way to GD&T this?
The dowel hole must have a tight positional tolerance to the center locating ring, and that it is in this orientation to the indicating edge (-B-) of the fixture. The indicating edge has to be orientated tightly horizontally to the pattern, but can have a larger positional tolerance in the Y axis.
Thanks

 

[weavedreamer]

And inserting this before the next two comments, what is the pertainent standard. Now, presuming an ASME framework:

The perpendicularity callout is missing a diameter symbol, or a reference to datum B if it is orientation sensitive.

Is the XY indicator at the lower left supposed to be related to the view calling out the locating ring?

 

[powerhound]

This is probably better expressed with two different FCFs. All you are effectively doing with this is tightening up perpendicularity to A to .002. Location is still within .030. Is this the entire drawing because nothing is controlling where the center is from the edge. I see a basic 1.625 from the edge and a perpendicularity to control the orientation but there's no locational tolerance that I can see. Since teh edge is secondary, you should control the holes to it rather than vice-versa. I see no control over the holes either.

John Acosta, GDTP Senior Level
Manufacturing Engineering Tech
SSG, U.S. Army
Taji, Iraq OIF II

 

[ronj100]

yes, diameter symbol is missing. Thanks
Ignor the cad interface axis. It is part of the cad system, not part of the drawing.
Any suggestions on my actual question?

 

[ronj100]

I removed all dimensions from the drawing that I thought were not essential to my question.
The indicating edge needs to be controlled because the machine operator uses a dial indicator to square up the fixture on the cnc machine.
The critical part of this fixture is the center locating ring and the dowel hole location, and that the indicating edge is orientated to that pattern as shown.
So I want to control the "orientation" of the indicating edge to the pattern, but have a large freedom of location of that edge in the y axis.

 

[powerhound]

Well, as I said. The location of your dowel hole is only controlled to within .030. I don't know if that's what you're after or not.

John Acosta, GDTP Senior Level
Manufacturing Engineering Tech
SSG, U.S. Army
Taji, Iraq OIF II

 

[ronj100]

Let me start over.
How can I tolerance the orientation of the edge to the dowel hole and datum c without having to use a note like this?

Hope this helps

 

[powerhound]

If you make that flat datum feature B again and reference B in the feature control frame that controls the dowel hole location, that will control the location of the dowel hole to within .002.

John Acosta, GDTP Senior Level
Manufacturing Engineering Tech
SSG, U.S. Army
Taji, Iraq OIF II