Make Certain You Have Controlled Your Datum Features! (#163)
(In accordance with Y14.5M-1994 standard)
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In most cases, datums are established from the extremities or high points of datum features. Measurements are then made from the true geometric counterpart of the datum feature. Consequently, datum features often do not get checked unless there is a tolerance that affects the datum feature. On the first drawing, the form (flatness) of datum …
