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You Can Use a Slot as a Primary Datum Feature - If it Is Large Enough (#170)

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

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A recent question I received asked how to identify a slot width as a primary datum feature. I drew the illustration below to indicate the proper method. Keep in mind that a slot may be thought of as containing two features of size-a length and a width. Rarely though is a slot large enough to serve as a "good" primary datum feature. We use datum …

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Back to Tips Tip added Mar 2004