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Planar Datum Features Constrain 3 Degrees of Freedom
(In accordance with the ASME Y14.5-2009 standard)

PDF of this Tip

There is a new chart in the ASME Y14.5-2009 standard that shows the degrees of freedom that are constrained when the feature is a primary datum feature and, where appropriate, applies RMB. The chart also shows the relationship between the feature type, simulator and theoretical datum(s) that are established. The next several monthly Tips illustrate the features shown in the chart. Although some of the simulators are illustrated as physical inspection equipment, these simulators may also be simulated by "soft gaging" optical or probing methods.

Back to Tips Tip added Nov 2009