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GD&T modifiers |F and |F/C

GD&T modifiers |F and |F/C

GD&T modifiers |F and |F/C

(OP)
I have a drawing for a casting made from spheroidal graphite iron (also known as ductile or nodular). Some of the dimensions have modifiers like |F and |F/C. See image below.




What do these represent?

RE: GD&T modifiers |F and |F/C

Do you have datums F & C?

Did someone not know how to generate F-C in the FCF their CAD package or something?

In fact, a number of the call outs look odd in various ways so I'm wondering if someone that didn't know GD&T &/or the relevant CAD system did the drawing.

Posting guidelines FAQ731-376: Eng-Tips.com Forum Policies http://eng-tips.com/market.cfm? (probably not aimed specifically at you)
What is Engineering anyway: FAQ1088-1484: In layman terms, what is "engineering"?

RE: GD&T modifiers |F and |F/C

(OP)
Yes to datum C but no to datum F. It is drawn to ISO standards by a German-language company. I believe the rounded rectangles surrounding the dimensions are related to key characteristics that require statistical verification.

RE: GD&T modifiers |F and |F/C

The obround frames appear as infamous SolidWorks "critical dimension" symbols.

The numbers on the very right (4, 6) are probably references to QC sheet / inspection report.

Given the difference in accuracy between DIA 85 and DIA 80.5 (M6 vs. H6) one may speculate F and F/C means something like "Forged" / "Forged/Cut" but that just my imagination.

The appropriate ISO standard for castings is ISO 8062 (old 1994 or new 2008 parts 1, 2, 3). Something tells me you won't find F / F/C in there.

"For every expert there is an equal and opposite expert"
Arthur C. Clarke Profiles of the future

RE: GD&T modifiers |F and |F/C

Found something: letters B thru K are used to indicate required machining allowance grade, BUT they should be used in general note and not the individual dimensions.

"For every expert there is an equal and opposite expert"
Arthur C. Clarke Profiles of the future

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