Explain the 3-2-1 Rule.
What will be an ideal response?
ANS:
The 3-2-1 Rule defines the minimum number of points of contact for a part with its primary, secondary, and tertiary datum planes. The 3-2-1 Rule: A part will have a minimum of three points of contact with its primary datum plane, two points minimum contact with its secondary datum plane, and a minimum of one point of contact with its tertiary datum plane. The 3-2-1 Rule only applies to a part with all planar datums.
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