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Can a centerline be contructed and used as a tertiary datum?

Shane-o
Hello all I'm wondering if a centerline can be constructed from a basic dimension
and utilized to make a centerline to make as datum C. Datum A is the face of the part that will mate with another in assembly ( the most critical) Datum B is a plane perpendicular to datum A. Datum C however isn't properly callout and is a an imaginary Datum "floating" exactly in the center of this part as a centerline. I just want to know weather anyone has seen or even constructed a centerline for a datum from a BASIC dimension (which in this case the basic dimension is about the only possible feature to even construct this datum).
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  • I think that -C- should be the width of the slot (3.560). And with -C- being primary datum for position of Ø.227-.233 holes and Ø.1265 hole it should be a leveling feature like a plane.

    Datum C it's not created from basic dimensions but the center of the slot.

    This is an assumption. A datum has to be to a feature on the part (in the 1994 edition see section 4.2.2).

    Shane, that is an ambiguous drawing IMNSHFO. Given that 4x the Dia. .227 is called true to C primary those holes are not what makes up C. I think it is the center of the 3.560 square, but I would want real clarification of that.


    +1,000,000 always ask if you are unsure, the only way to CYA.
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  • I think that -C- should be the width of the slot (3.560). And with -C- being primary datum for position of Ø.227-.233 holes and Ø.1265 hole it should be a leveling feature like a plane.

    Datum C it's not created from basic dimensions but the center of the slot.

    This is an assumption. A datum has to be to a feature on the part (in the 1994 edition see section 4.2.2).

    Shane, that is an ambiguous drawing IMNSHFO. Given that 4x the Dia. .227 is called true to C primary those holes are not what makes up C. I think it is the center of the 3.560 square, but I would want real clarification of that.


    +1,000,000 always ask if you are unsure, the only way to CYA.
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