![]() Datum targets are symbols that describe the shape, size, and location of gage elements that are used to establish datum planes, axes, and points.Coplanar datum features are two or more datum features that are on the same plane.Coplanar surfaces are two or more surfaces that are on the same plane.The 3-2-1 Rule defines the minimum points of contact, with the primary datum as 3, the secondary datum as 2, and the tertiary datum as 1.A part may have as many datum reference frames as needed to define its functional relationships.A Datum reference frame is a set of three mutually perpendicular datum planes, which provide direction and origin of measurements.Datum Features are often the features that orient (stabilize) and locate the part in its assembly.Datum Features are selected on the basis of part function and assembly requirements.A true geometric counterpart is the theoretical perfect boundary or best fit tangent plane of a specified datum feature.A datum feature is a part feature that contacts a datum.A datum is a theoretically exact plane, point, or axis from which a dimensional measurement is made.One-of-a-kind part specify your tolerances RFS. MMC is very useful when designing a part destined for mass production (reduce rejection rates). ![]() RFS means that the geometric tolerance applies regardless of the actual produced size of the feature. Otherwise MMC or LMC must be specified on the Feature Control Frame.
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