Does anyone has or know where to find the solution to FIG.4-7 drawing from ASME-Y14.5M-2009. 2

[JGarcas]

I am dealing with a part that is using an inclined datum feature, and I will like to use as a reference the solution of FIG.4-7 sample from ASME-Y14.5M-2009, does anyone know where could I get this?

 

[JGarcas]

Here is how it should look in close position for reference

 

[pmarc]

Based on the provided pictures, it almost looks like the dia. 8.5 hole should be used as secondary (B) and the dia. 14 as tertiary (C) datum features. The other features could be controlled with profile relative to A, B and C.

 

[JGarcas]

Pmar, based on your proposed datum structure, then you would use Datum A the flat surface where those 2 holes are (6.5 & 14)?

 

[pmarc]

Yes. This looks to be the face that plays the most important role in orienting the bracket in the assembly.

 

[JGarcas]

I agree, but then how would you control the location of the radius where the tubes go in the assembly, would you add a true positions to those two radiuses where the tubes go when they close it in the assembly, or what would be the best approach in your opinion?

 

[pmarc]

I would use profile for that.

 

[JGarcas]

With the open angle of 51 degrees +20/ - 0, would make it very difficult to check that profile in a fixture with that angle range.

 

[JGarcas]

The real challenge I see is make sense of the drawing to make a fixture that allows to check the radiuses position (Where the tubes go)to the surface where the bracket is mounted Datums A,B,C that you are proposing @pmar

 

[greenimi]

You already have indentified some basic dimensions such 40.9, 25.8, 17.9, how are you planning to check the features applicable to those dimensions? What callouts are you going to use?
Since those features are less than 180 degress driving an actual mating envelope from them it is not very repeatable so maybe, as pmarc stated, profile is the way to go.

What are YOU proposing?

 

[JGarcas]

@greenimi I thought the same when customer shared the drawing, as I mentioned this drawing is not well defined. I also agree with @pmar but I still find difficult to transfer that idea into a fixture to check the profile.

The shape of the part plus the variations from angles make things difficult to check in a fixture.

 

[3DDave]

Make a fixture that looks like the installation in the car. Decide how misaligned the tubes can be and how much force that is acceptable to use and from those determine what the alignment and location variation is acceptable.