The Y14.5 standard tells us we can use a pattern of features to establish a datum or datums (section 4.5.8). Unfortunately, the explanation that follows in the Standard only covers a pattern of holes at MMC. There is no support for using a pattern of features of size RFS. Where two parallel holes are used as a pattern to help establish a datum …
Patterns of Features Used to Establish Datums Are Tricky (#162)
(In accordance with Y14.5M-1994 standard)
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