Profil tolerance check (Unequally Disposed Tolerance)

[Engingeeer]

Does anyone have any suggestions for checking the profile below? Would it be possible to check this with a GO-NOGO gauge?
Thank you in advance for your advice!

 

[3DDave]

It is typical to attach the leader from a feature control frame to the feature(s) that are being controlled. The leader is not pointing to either F-G or H-I.

Since it is profile of line it does not seem reasonable to create a gauge; each line element is inspected separately.

Even with profile of surface, one can establish a one-sided boundary and then probe with a feeler gauge for departure from that gauge boundary. At least for this case it isn't possible to make a meaningful GO gauge as it cannot detect when too much material has been removed.

 

[mfgenggear]

Yep my choice for inspection would be optical comparitor

 

[Doug Hunter]

Without MMC allowance, I don't think you can use a GO-NOGO. The implication of the specification is that you need numerical data, so I think you'll need to use a CMM.

 

[Garland23]

Doug, profile is not permitted to be modified with MMC (it's not a feature-of-size thing, but merely a surface or line).
I think the terminology might be confusing. The go/no-go type of gauge that might work with profile isn't what we think of as a typical go/no-go; it's more of a template that allows one to visually see if the edge stays within its boundaries (red and green scribed lines).

 

[Doug Hunter]

Garland23, I agree. I was speaking in a more general gauging sense (GO-NOGO vs. numerical) and not to a specific tolerance type. I should have been clearer.

 

[greenimi]

What standard is this drawing ?
Looks like a company specific standard rather than a national standard (ASME, ISO GPS, )
Is this Automotive drawing, company specific?

 

[Engingeeer]

What standard is this drawing ?
Looks like a company specific standard rather than a national standard (ASME, ISO GPS, )
Is this Automotive drawing, company specific?

Yes it's Automotive drawing, company specific.

 

[greenimi]

Yes it's Automotive drawing, company specific.

Which company?

 

[greenimi]

It is typical to attach the leader from a feature control frame to the feature(s) that are being controlled. The leader is not pointing to either F-G or H-I.

I agree with you here, but only if they use a national standard such as ASME or ISO GPS (DIN etc).
Looks like this is an automotive specific standard hence the interpretation might be totally different.

Example: How do you know what circled U means? Are you going to interpret it per ASME or per ISO (UZ)?

 

[Engingeeer]

Which company?

Unfortunately, I can't share this. Sorry

 

[greenimi]

Unfortunately, I can't share this. Sorry

Then
1.) Look at the definition of the circled U in the company specific standard and let us know how we supposed to interpret U symbol.
2.) Look at the definition of the -allegedly- "in between" symbol and let us know how to interpret it.
3.) Tell V....vo engineers they have a low quality drawings where circled U and "F-G" and "H-I" cannot be legally interpreted, at least not per their released standard.
(if not V...vo scratch my point #3 and use the correct automotive company). Vast majority of the callouts are per ISO GPS and circled U is per ASME and no correct interpretation could be found.

If I am wrong I will sure stand corrected. So, please provide any pertient feedback. I am willing to learn.


Google for V...vo automotive standards.

Corporate Standards

Information and FAQ​

Whenever there is a reference to a standard, the standard is valid. Some of our standards have been labelled "Not for new design", but these standards are also valid if referred to. The text "Not for new design" is primarily an indication for our for our design engineering departments, stating that the standard is not intended for new designs.

Most of our more recent drawings contain a reference to a standard named "Symbols, designations and general drawing methods". This standard, STD 101-0005 establishes some general rules and makes reference to the valid standards for most of the symbols in our drawings.

A simple google search for STD 101-0005

https://www.scribd.com/doc/72915018/101-0005