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Stop Messing with Old School Tolerancing (#172)

(In accordance with Y14.5M-1994 standard)

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A recurring question I receive is: Do all toleranced dimensions relate to the datums stated on the drawing? And the answer is a resounding NO. Datums only apply when referenced. This drawing has multiple interpretations. Adding the note: DIMENSIONS RELATE TO DATUM A PRIMARY, DATUM B SECONDARY AND DATUM C TERTIARY (para 4.4 of ASME Y14.5M-1994) …

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