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4x cone diameters as datum

pcdmisstudent
question for the pros out there
i have this casted part that has a datum target of 4x diameters.
these diameters are in a conical hole, and they re boxed 8.2mm down in the cone hole.

to get this datum
do i measure 4x circles 8.2mm down in the hole, and bestfit to them
or do i measure 4x cones, construct 4x circles using cone feature and 8.2mm down, and bestfit to them

ty all
love u
boy hol
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  • The 4 cones establish the -B- Datum. What sets -A- & -C- ? using the diameters at the required depth, measure all the cones then construct lines and mid-points between them. Then construct lines from the mid-points. Use these lines for alignment and set origin at intersection. this will split any error evenly.

    HTH
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  • The 4 cones establish the -B- Datum. What sets -A- & -C- ? using the diameters at the required depth, measure all the cones then construct lines and mid-points between them. Then construct lines from the mid-points. Use these lines for alignment and set origin at intersection. this will split any error evenly.

    HTH
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