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3-2-1 Datum Sequence Planner
Draft the datum discussion before sending a drawing for review. The planner follows the 3-2-1 contact concept, but the product designer remains responsible for functional datum selection and the released drawing.
Datum features
Generated drawing-review brief
Before release
- Define basic dimensions and feature control frames from the same datum reference frame.
- State which file controls if the 3D model and 2D drawing disagree.
- Agree how each critical feature will be measured and reported.
Reference: GD&T technical guide for the datum reference frame and 3-2-1 contact sequence.
