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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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GD&T: Application and Interpretation © Goodheart-Willcox Co., Inc.
• 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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Position for Symmetryof Hole Patterns
8/9/2019 Lecture 9- Symmetry & Concentricity, Expanded Position Tolerancing
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Symmetry for Features of Size
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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
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GD&T: Application and Interpretation
Concentricity !ero Error
© Goodheart-Willcox Co., Inc.
• E)en thouh a feature ha" "urface and "i5e)ariation, it !a ha)e no concentricit )ariation
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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"
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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"
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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"
8/9/2019 Lecture 9- Symmetry & Concentricity, Expanded Position Tolerancing
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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"
