• Step 9: Once your tolerances have been applied press “Finish”. You will now see the results of the tolerance application. A graphical representation of where the upper and lower limits are set will be displayed as dashed circles. The actual circle will be displayed as a solid line circle. The rectangular tolerance zone will be indicated by a square at the circle center, with a dot showing the center location of the toleranced feature. The numerical deviation of the X, Y, and D dimensions will also be displayed. Tolerance failures will be displayed in red. There is also a “deviation fence” graphic showing how much of the tolerance band the actual dimension consumed.
Other feature types use similar conventions for set up tolerancing
IMPORTANT: Most tolerances types are applied in a similar method as described above. In some cases however tolerances can make use of a reference feature, other than the datum. The two most common examples of this are for Concentricity and Angularity tolerances. An example has been provided below.
Use the following steps to apply a concentricity tolerance to a circle:
IMPORTANT: In all cases where a reference feature will be used for a tolerance, the feature being referenced must be measured prior to the feature being tolerance.
• Step 1: Measure all features required to establish your part datum, as well as the circle features to be used for the concentricity tolerance. Select the circle that you would like to apply the concentricity tolerance and apply the tolerance per the procedure described in the section above.
Note: It may be that the reference for the concentricity tolerance is the same as the part datum. In this case no tolerance reference is required, as the datum will be “assumed”.
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