L-4 Dimensioning and Tolerancing-1

L-4 Dimensioning and Tolerancing-1 - Dimensioning and...

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Dimensioning and Tolerancing ME 1800 L-4
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Objectives Introduce what dimensioning and tolerancing are Appreciate correct dimensioning and standards Introduce how to determine the correct tolerance
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Information Flow Concept Design description Domains and hierarchies CNs→FRs→DPs Drawings (CAD) (dimensions, tolerances) CNC Machine control (tools, PVs, tool path) CAM Machine tool Machined part
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Rationale Dimensioning and tolerancing communicate how to make and check the part Dimensioning and tolerancing are important because they communicates the intent of the designer Poor dimensioning and tolerancing cost money – rejecting good parts, accepting poor ones.
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Standards USA (Am. Soc. Mech. Eng./ Am. Nat. Stds. Inst.) ASME/ANSI Y14 Geometric Geometric Dimensioning and Tolerancing Dimensioning and Tolerancing International Standards Organization ISO 213 Dimensional and geometrical Dimensional and geometrical product specifications (GPS) and product specifications (GPS) and verification verification
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ISO 213 Dimensional and geometrical product specifications and verification examples of working groups … TC 213/WG 2 Datums and datum systems TC 213/WG 4 Uncertainty of measurement and decision rules TC 213/WG 6 General requirements for geometrical product specification (GPS) measuring TC 213/WG 10 Coordinate measuring machines TC 213/WG 16 Areal and profile surface texture TC 213/WG 18Geometrical tolerancing
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How do you check this part? Which surfaces would you make first? Tolerance stack up? Max: 1.352 + 4.109 = 5.461 + 0.01 =5.471 Min: 5.451
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Rectangular (or linear) tolerance on hole location
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Rectangular v Round (geometric) tolerance
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GD&T Geometric dimensioning and tolerancing is an international language used on drawings to accurately describe a part . The language consists of a well-defined set of symbols, rules, definitions, and conventions that can be used to describe the size, form, orientation, and location tolerances of part features. is a web site of one of the many companies that teaches GD&T. WPI also teches GD&T as part of Corporate and Professional Education http://cpe.wpi.edu/Individual/Workshops/sixsigma.html
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GD&T
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L-4 Dimensioning and Tolerancing-1 - Dimensioning and...

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