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A cone can restrict 5 degrees of freedom. I have seen some drawings with a note that the cone is not to control the axial origin and to use another surface for this purpose.
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Thanks Andreas. I just see an exaggerated deviation of a cone that doesn't represent most cases of this type of situation. If design was correct, there would be controls in regard to orientation to the -A- cone, like perpendicularity of a lower precedented face. If I saw a part like what you've graciously drawn up for us and there weren't any controls for features back to -A-, I would be sending that back for drawing review or revision change.
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Andreas,

You can't use a cone as a datum simulator for a cylinder. The simulator must be the "true geometric counterpart" of the datum feature. In this case, it must be a cylinder.

What questions do you have about Y14.5.1? For obvious copyright reasons, I can't just post the document.
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1132_3dc1c72324ddde33494566cb07d5fbfc.png
This looks like a cone, acting as a datum feature simulator. If I misinterpreted your image, it was a mistake made in good faith.

I am happy to post snips of the standard, but I don't know what snips to post unless you have specific questions
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