What is the ideal number of datums for a part?
Understand the Problem
The question asks about the ideal number of datums for creating a part, possible related to manufacturing or CAD. We need to determine the best number of reference points/surfaces for accurate part creation and measurement.
Answer
The primary datum feature must have at least 3 points of contact with its datum plane.
The primary datum feature must have at least 3 points of contact with its datum plane.
Answer for screen readers
The primary datum feature must have at least 3 points of contact with its datum plane.
More Information
The 3-2-1 rule is a principle used in dimensional metrology to establish a datum reference frame (DRF) for a part. It dictates the minimum number of points of contact required between the part and the datum planes to constrain its movement and ensure accurate and repeatable measurements.
Tips
GD&T principles can be complex, and it is important to consult the ASME Y14.5 standard for detailed information and specific applications.
Sources
- Mastering GD&T: Building Datum Reference Frames - fiveflute.com
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