GD&T interpretation

Hi Folks,

I am trying to understand the highlighted callout on the drawing attached. Does it mean that there is a requirement for the Positional Verification of the clip and the profile check on the inner edge if the clip. If that is the case then the profile check (+/-0.25 which is half of 0.5) would have the bonus form the positional check (2) ? so that the total profile check would be for 2.5 (+/-1.25). Your opinions are highly appreciated.

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kbotta over 1 year ago

I cannot see your whole drawing, but the FCF in question does not allow "bonus" on the feature size. You do have datum "shift" or displacement allowable for the primary and secondary datum portions of the FCF. In this case, the profile of 0.5mm goes "all around" the feature controlling the clips "size and form"- and the position requirement defines the location requirements (bi-directional). Many years ago they used to use the "boundary" term when dimensioning like this...
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vpt.se over 1 year ago

The positional callout for the grille attach "T" - which is defined as position in one axis (not diametrical) - is lacking in what direction the requirement applies. You will need to get clarification from the designer regarding this. Otherwise you will not know how to evaluate them.
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VinniUSMC over 1 year ago in reply to vpt.se

Why do you say it is one axis because it is not diametrical? That just means it isn't a circular tolerance zone. It can still be square and two-axis.
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Matthew D. Hoedeman over 1 year ago

way too much wrong with that. (M) for a surface? It isn't a feature of size, not allowed.
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asif_inayath_ai over 1 year ago in reply to kbotta

Please let me know in any of the GDT standards if the profile check in above mentioned case would get an additional tolerance from positional Tolerance, so that the profile check tolerance would increase.
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vpt.se over 1 year ago in reply to vpt.se

But there is no indication of neither, so...
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MattR over 1 year ago

Profile requirement in this case checks form only not location. That is what T.P callout aims for. My suggestion take one point on one side of clip & another on its other side get mid point & check its location to the datum scheme. For profile take a bunch of points or scan around its contour & establish a scan set & then check its form. But to be sure discuss this with engineering like the other commenter had said. Let them sign off anything they decide.
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