10_0Tolerances - Tolerances Introduction tolerancing...

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Tolerances
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EML 2023 Computer Aided Design Introduction • tolerancing – technique of dimensioning parts within a required range of variation to ensure interchangeability • A tolerance should be as large as possible without interfering with the function of the part to minimize production costs. 2
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EML 2023 Computer Aided Design Tolerance Dimensions • unilateral tolerance • bilateral tolerance • limit tolerance 2.250 +.000 -.008 2.250 ± .004 2.255 2.245 3
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EML 2023 Computer Aided Design Mating Parts 4
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EML 2023 Computer Aided Design Cylindrical Fits 5
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EML 2023 Computer Aided Design Cylindrical Fits – English Units tolerance - difference between the limits of size for a single feature ; shaft .0025 ; hole .0040 limits of tolerance – the max and min sizes of a single feature allowance – the tightest fit between two mating parts ; .0050 nominal size – the general size of a shaft or hole ; 1.5 basic size – the size to which the plus-and minus is applied actual size – the measured size of the finished part fit - the degree of tightness or looseness between two assembled parts 6
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EML 2023 Computer Aided Design Cylindrical Fits – English Units clearance fit – gives a clearance between two assembled mated parts ; min clearance .005 ; max clearance .0115 transition fit interference fit line fit 7
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This note was uploaded on 11/03/2010 for the course ME 2303 taught by Professor Kumar during the Spring '10 term at University of Florida.

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10_0Tolerances - Tolerances Introduction tolerancing...

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