When referencing a planar surface as a primary datum and a diameter as a secondary datum feature MMB, what six conditions apply?
What will be an ideal response?
ANS:
The six conditions that apply when referencing a planar surface as a primary datum and a diameter as a secondary datum feature MMB are:
1. The part will have a minimum of three-point contact with its primary datum feature simulator.
2. The secondary datum feature simulator is fixed at the MMB size.
3. The secondary datum feature simulator is perpendicular to the primary datum plane.
4. The datum reference frame consists of a primary plane and two planes passing through the secondary datum axis 90 degrees to the primary plane.
5. Five degrees of freedom are constrained (three translational and two rotational).
6. Datum shift may be available.
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