This example illustrates both secondary and tertiary datum features specified at MMC but simulated at virtual condition.Ĥ.5.4.3 Determining Size. Where secondary or tertiary datum features of size in the same datum reference frame are controlled by a specified tolerance of location or orientation with respect to each other, the size of the true geometric counterpart used to establish the simulated datum is the virtual condition of the datum feature. 6-2.Ĥ.5.4.2 Size of a Secondary or Tertiary Datum Feature. Where a straightness tolerance is applied on an RFS basis, the size of the true geometric counterpart is the applicable inner or outer boundary. Where a straightness tolerance is applied on an MMC basis, the size of the true geometric counterpart is the MMC virtual condition. Of size is controlled by a roundness or cylindricity tolerance, the size of the true geometric counterpart used to establish the simulated datum is the MMC limit of size. In each case, the size of the true geometric counterpart is determined by the specified MMC limit of size of the datum feature, or its MMC virtual condition, where applicable.Ĥ.5.4.1 Size of a Primary or Single Datum Feature. Where a datum feature of size is applied on an MMC basis, machine and gaging elements in the processing equipment that remain constant in size may be used to simulate a true geometric counterpart of the feature and to establish the datum.
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