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By implication, all other characteristics are Minor. Reasonably anticipated variation of these characteristics should not affect principal fit, function, durability or customer satisfaction of the component or its assembly.Ī Design team consisting of a Designer, Product Engineer of Record, Design Checker, and a Manufacturing Engineer to examine the characteristic on each part and assembly drawing and identify the Critical Characteristics. Minor Characteristic - Product features, dimensions, or notes that establish a secondary requirement within the part or assembly. RE: CRITICAL on drawings swertel (Mechanical) 19 Sep 06 09:58 What I found that was with judicious use of this symbol, I got 100% inspection.ĬAD-Documentation-GD&T-Product Development The symbol I've used in the past was a split oval shape where one half indicates 100% and the other half lists the dimension refeence letter for the inspection report. If that's an acceptable risk, then live with it if it's not, then you need to specify an inspection requirement. If parts are qualified on statistical processing, then you're accepting that some bad parts may get through. The reality, of course, is that processes and equipment change over time and validation is needed frequently. If your shop is like so many others, they figure that their best efforts are good enough providing that they met the spec at some time in the past, so they don't inspect every piece anymore. "CRITICAL" is like saying "RUSH" in the 's overused and usually ignored. RE: CRITICAL on drawings MintJulep (Mechanical) 18 Sep 06 21:21 We use a diamond symbol which is explained by a note that references the company policy rather than writing critical next to the dim. Personally I think of it more as being an indication of a dimension that should be 100% inspected rather than just sampling/statistical but someone more familiar with the concept may be able to shed more light.
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In practice though maybe this is an over simplification. I would also expect all parts to meet said tolerances. To me in essence if the drawing is correctly toleranced then I would expect that any values outside of the tolerance of any dimension may cause problems while any value withing the range is OK. Now I can't say my heart is really in what's there. Variation to these identified elements could directly affect the integrity of the design and its application. Critical Characteristic - Product features, dimensions or notes that stand out as being primary to fit, function or application of a given part or assembly.