Often two holes are used as datum features. There are several ways to accomplish this. The two holes may be used as a pattern (linear extruded feature) or one may serve as a datum feature that establishes an axis (origin of measurement) and the other orients the two perpendicular datum planes that intersect at this axis and, of course, the …
Two Holes as Datum Features - Horizontal (#246)
(In accordance with the ASME Y14.5-2009 standard)
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