Where a virtual condition equal to MMC is the design requirement, a zero geometric tolerance at MMC is specified. Consideration must be given to the effects of the difference in size between the applicable virtual condition of a datum feature and its MMC limit of size. An analysis of tolerance controls applied to a datum feature is neces sary in determining the size for simulating its true geometric counterpart. coal mine are simulated based coal mining stratum datum, tunnel datum and images, which enable workers to interact naturally with hypothesized entities. 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. point(s) on point(s) on the How is a datum target area represented on a drawing? Describe how to properly display the symbols for a circular datum target area, a square datum target area, a rectangular datum target area, and a spherical datum target area.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. The tertiary datum plane must be established by at least tertiary datum surface. The secondary datum plane must be established by at least the secondary datum surface. point(s) on the The primary datum plane must be established by at least - primary datum surface. This is known as the datum Identify how many degrees of freedom are found on every part, and identify how many are translational and how many are rotational.ĭefine datum targets. A) 12.5+0.03 À ΑΙ Part 1 A) Part II When referring to the datum reference frame in the feature control frame, the - datum is given first followed by the and datums. Provide the actual dimensions as related to the drawing at Part II B, C, and D. Given the following drawing and related meaning, fill in the blanks at Part I A and B and at Part II A, B, C, and D. Identify at least three required conditions for datum feature simulators. Name at least four items that can be used as a datum feature simulator. Identify the datum feature, the part, the simulated datum plane, the physical datum feature simulator, and the datum plane on the following illustration.
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