Tolerances

Tolerances - clearance. Interference fit: internal member...

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Tolerances
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Tolerance The total amount a specific dimension can vary. (ANSI Y14.5M-1994) Tolerances are assigned so that any two mating parts will fit together. Highly accurate parts are extremely expensive, so tolerances should be as generous as possible while still maintaining proper function for the part.
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Limit Dimensions Limit dimensions specify the upper and lower value. An acceptable part may be at the upper limit, lower limit, or any value in between.
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The minimum clearance space or maximum interference is the allowance . Fit is the range of tightness or looseness between parts for their function.
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Types of fit Clearance fit: internal member always has space or
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Unformatted text preview: clearance. Interference fit: internal member is always larger and has to be forced inside external member. Plus/minus dimensioning Basic size of dimension is given with tolerances expressed as a plus/minus range. Equal Bi-lateral Tolerances Baseline vs. Continued Baseline tolerances dont stack-up Continued (chained) tolerances stack-up Summary There are several methods you can use to specify tolerances in a drawing. Limit tolerances give the upper and lower range for a dimension Plus/minus tolerances give the nominal or basic size and a plus and/or minus range for the tolerance....
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Tolerances - clearance. Interference fit: internal member...

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