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Just like John said. Three basic dimensions give the location for the axial feature, the first datum in the FCF is the feature to which the axis is to be normal. Then look at the pic I posted demonstrating this (it does not include the FCF sorry). As far as TP to a point it is illegal. It doesn't matter if GM does it or Ford or Boeing or whoever. You can't TP a point, per the standard it needs to be a FOS. Does this mean you can not make PCDMIS do it? No. Does it mean you are misinterpreting it and design intent is not being met? No. Is it a bad callout? Per the standard it is.
There are no exceptions that I know of in regards to the shape of the tolerance zone. The shape of the tolerance zone is dictated either by the shape of the feature or by basic dimensions (i.e. profile).
Just like John said. Three basic dimensions give the location for the axial feature, the first datum in the FCF is the feature to which the axis is to be normal. Then look at the pic I posted demonstrating this (it does not include the FCF sorry). As far as TP to a point it is illegal. It doesn't matter if GM does it or Ford or Boeing or whoever. You can't TP a point, per the standard it needs to be a FOS. Does this mean you can not make PCDMIS do it? No. Does it mean you are misinterpreting it and design intent is not being met? No. Is it a bad callout? Per the standard it is.
There are no exceptions that I know of in regards to the shape of the tolerance zone. The shape of the tolerance zone is dictated either by the shape of the feature or by basic dimensions (i.e. profile).
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