lecture 9- symmetry & concentricity, expanded position tolerancing

8/9/2019 Lecture 9- Symmetry & Concentricity, Expanded Position Tolerancing

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9Position Tolerancing—

Expanded Principles,Symmetry, and Concentricity

8/9/2019 Lecture 9- Symmetry & Concentricity, Expanded Position Tolerancing

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• Explain functional ain !ethod" for chec#inhole po"ition tolerance" "pecified at $$C.

• %pecif and explain co!po"ite po"ition tolerance

"pecification".

• Explain the effect of u"in identical datu! feature

reference" in !ultiple po"ition tolerance

"pecification".

8/9/2019 Lecture 9- Symmetry & Concentricity, Expanded Position Tolerancing

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8/9/2019 Lecture 9- Symmetry & Concentricity, Expanded Position Tolerancing

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8/9/2019 Lecture 9- Symmetry & Concentricity, Expanded Position Tolerancing

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Position for Symmetryof Hole Patterns

8/9/2019 Lecture 9- Symmetry & Concentricity, Expanded Position Tolerancing

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Symmetry for Features of Size

8/9/2019 Lecture 9- Symmetry & Concentricity, Expanded Position Tolerancing

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Concentricity

• 2e'uire" deri)ed !edian line located relati)e todatu! axi"

•  Al(a" ha" dia!eter "!ol

•  Al(a" applied 23%• $u"t ha)e datu! feature reference

• Datu! reference i" al(a" 2$4

• 2arel u"ed

8/9/2019 Lecture 9- Symmetry & Concentricity, Expanded Position Tolerancing

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Concentricity FeatureControl Frame

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Concentricity Median ine

8/9/2019 Lecture 9- Symmetry & Concentricity, Expanded Position Tolerancing

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Concentricity !ero Error 

© Goodheart-Willcox Co., Inc.

• E)en thouh a feature ha" "urface and "i5e)ariation, it !a ha)e no concentricit )ariation

8/9/2019 Lecture 9- Symmetry & Concentricity, Expanded Position Tolerancing

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Composite Position Tolerance

• 6ne po"ition "!ol

• T(o or !ore "e!ent"

• %a!e datu!", "a!e order, "a!e !odifier"

8/9/2019 Lecture 9- Symmetry & Concentricity, Expanded Position Tolerancing

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8/9/2019 Lecture 9- Symmetry & Concentricity, Expanded Position Tolerancing

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F"T!F

• 3eature-relatin tolerance 5one fra!e(or#

• *ronounced fritz 

• 7o(er "e!ent8"9

• ot located relati)e to datu! reference fra!e• Con"trained in rotation relati)e to referenced

datu!"

• $u"t, at a !ini!u!, o)erlap *7T;3

8/9/2019 Lecture 9- Symmetry & Concentricity, Expanded Position Tolerancing

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Composite Position #pplication

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$o "epeated %atum "eferences

• 3ree to float relati)e to datu! reference fra!e

• 3eature" !u"t e ale to !eet tolerance

re'uire!ent" in fir"t and "econd "e!ent"

8/9/2019 Lecture 9- Symmetry & Concentricity, Expanded Position Tolerancing

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"epeated Primary%atum "eference

• 2otational deree" of freedo! con"trainedrelati)e to pri!ar datu!

• 3eature" !u"t e ale to !eet tolerance

re'uire!ent" in fir"t and "econd "e!ent"

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"epeated Primary andSecondary %atum "eference

• 2otational deree" of freedo! con"trainedrelati)e to pri!ar and "econdar datu!

• 3eature" !u"t e ale to !eet tolerance

re'uire!ent" in fir"t and "econd "e!ent"

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Functional &aging forPosition Tolerances at MMC

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&aging a CompositePosition Tolerance

• %i!ilar to "inle "e!ent po"ition tolerance

• T(o ae" tpicall re'uired to chec# co!po"ite

tolerance"