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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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  • OK, I'll try again.

    Looking at part from -Z- plus plane.
    Measure the -A- Datum and level/origin it.
    Measure the 4 cones at 8.2 depth.
    Use the cones measurement to construct 4 lines along the perpendicular axis ( should make a square).
    Use the lines to construct 4 Mid-points .
    Use the 4 Mid-points to construct 2 more lines ( 1 X , 1 Y).
    These 2 lines should intersect at the center of the 4 cones.
    Align using 1 of the 2 Mid-point lines.
    Origin X&Y at intersect point of 2 Mid-point lines.

    HTH
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  • OK, I'll try again.

    Looking at part from -Z- plus plane.
    Measure the -A- Datum and level/origin it.
    Measure the 4 cones at 8.2 depth.
    Use the cones measurement to construct 4 lines along the perpendicular axis ( should make a square).
    Use the lines to construct 4 Mid-points .
    Use the 4 Mid-points to construct 2 more lines ( 1 X , 1 Y).
    These 2 lines should intersect at the center of the 4 cones.
    Align using 1 of the 2 Mid-point lines.
    Origin X&Y at intersect point of 2 Mid-point lines.

    HTH
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