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Tec-Ease, Inc. provides the most comprehensive GD&T training and coaching in the industry. Our GD&T courses are designed to keep the participant interested and engaged, while having fun.

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Tec-Ease, Inc. software packages are designed to help train and offer continued support to companies and employees in the industrial manufacturing field.

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Stop Messing with Old School Tolerancing (#172)

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

PDF is Available with GD&T Reference Center Subscription.

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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