GDT Callout Question

#1
I am looking for some guidance on how to call out a note that requires some clamp load in order to measure the thickness at the bolt hole on an assembly print. One idea:
1589385816292.png


The OEM facility will completely compress the gasket joint upon installation to the mating interface in the vehicle. Does this callout make sense? Is there a better call out option for clarity? Any help would be appreciated! Thank you!
 
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Proud Liberal

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#2
Is datum A defined with separate datum targets with location and size or is the inspection requirement to clamp over the entire area opposite the datum?

Another option is for all parties to agree on a inspection fixture that meets the requirement and reference that approved fixture in the notes. This totally controls how much of each surface (part, fixture, and clamps) is contacted and under what pressures. But depending on how much the 9-12 Nm clamps effects results, this might be overkill.
 

Ron Rompen

Trusted Information Resource
#3
The note appears to be clear and I don't see any problem with it. The only codicil I would add is that the mounting surface (the 'flat surface' mentioned in the note) needs to be more clearly defined. How flat is flat? As Proud Liberal mentioned, an agreed-on fixture might be the most appropriate solution.
 
#4
I am looking for some guidance on how to call out a note that requires some clamp load in order to measure the thickness at the bolt hole on an assembly print. One idea: View attachment 26813

The OEM facility will completely compress the gasket joint upon installation to the mating interface in the vehicle. Does this callout make sense? Is there a better call out option for clarity? Any help would be appreciated! Thank you!
I think you've done well. GD&T doesn't have a facility to tell us how to apply gages other than datum order. You're instructional note serves the purpose well. Just like in doing a Gage R & R though, I would test the instruction with three different people - make sure your understanding of what you are telling them is what they get out of it. To the degree you can use a photo in the instruction set, all the better.
 

Jim Wynne

Staff member
Admin
#5
Who is design responsible? You shouldn't be adding notes to a drawing that belongs to a customer, and you also shouldn't be deciding on your own how the part is to be inspected. You should be inspecting the part the same way that the customer does.
 
#7
Jim Wynne is correct. When I read your note, I thought it was OK and you were the design responsible party. The instruction is fine if you prove it out, but certainly get agreement with the customer/designer. There are many times when agreement about how to measure goes far past launch and it is something that should be worked out in advance of start of production.

One great method to alleviate these sort of issues in a gage design meeting BEFORE the design of the gage is started. It should include design, production, quality and process engineering - but certainly, the gage company that is chosen to create the gage. You throw a print of the part on the table and discuss what the design intent is and how conformance will be measured. It takes about 4 hours and saves days of time.
 

Jim Wynne

Staff member
Admin
#8
I should point out that it's not unusual for job shops to create "shop" drawings that are derived from the customer print. These will usually show dimensions to be checked in-process, and might include notes that don't appear on the original. This can become a control problem, however, if it's not managed properly. In any event, using instructions that don't take into account the customer's methods for measuring a feature or features is not a good idea. A shop drawing should not include specifications or instructions that don't appear on the original.
 
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