Parts Do Not Have Centerlines - Features Have Axes (#212)
(In accordance with Y14.5M-1994 standard)
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I continue to see datum feature symbols placed on center lines. The Standard allows this only if datum targets are used to indicate the datum feature. That was not the case for a company designing lens systems for use in space. Here is a simplified drawing of one of their lens barrels. They did not associate the datum feature A symbol with the …
