Lecture 18 Fits and Tolerances

Lecture 18 Fits and Tolerances - Lecture 18 Fits and...

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Lecture 18 Fits and Tolerances (Chapter 13) tolerance – used to control variation on manufactured parts/ Tolerance : total amount a specific dimension can vary amount of variation (of a specific dimension): -depends on function of each part and of assembly -assigned so two mating parts fit together what happens if tolerances are not specified? squareness of nut face affects fatigue life critical applications require tighter squareness tolerances Allowance : the minimum clearance space (maximum interference) between mating parts Nominal size: used for general identification Basic size, basic dimension : the theoretically exact size to which plus and minus tolerances are applied. Actual size : the measured size of finished a part. There are three forms for indicating dimensional tolerances. 1. Unilateral: the basic dimension is permitted to vary in only one direction ( either + or -).
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