Because we are checking the part in respect to the way it will be assembled, this ensures that only a functional part will pass inspection.Īs mentioned above, there is no tolerance associated with basic dimensions – they relate back to the datum reference frame. During inspection, the part will be fully constrained to this datum reference frame. The datums created by the datum features referenced in the feature control frame are highlighted in yellow in Figure 2. (The datum reference frame is usually set up to mimic the way that part is assembled.) Datum Feature A is the back surface of the part, Datum Feature B is the bore, and Datum Feature C is the keyway. The feature control frame for the bolt holes also references Datum Features A, B, and C, which sets up the Datum Reference Frame for inspecting the part. This feature control frame includes the position symbol, indicating that it is controlling the tolerance of the position of the bolt holes. The tolerance is a diametric tolerance zone centered on the established true position. The tolerance of the bolt hole location comes into the drawing through the feature control frame for the bolt holes, highlighted in green in Figure 2. These dimensions set up the true position of the bolt holes, and there is no tolerance associated with them. In this drawing, the dimensions for the bolt circle diameter and the bolt hole pattern angle are now shown as basic dimensions, highlighted in red in Figure 2.
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