industrial processes ii industrial processes ii inden 3313 lecture 10 -- geometric tolerancing and...

Industrial Processes II

INDUSTRIAL PROCESSES IIINDUSTRIAL PROCESSES II

INDEN 3313INDEN 3313

Lecture 10 -- Geometric Lecture 10 -- Geometric Tolerancing and DimensioningTolerancing and Dimensioning

Precisely Defining Parts and Precisely Defining Parts and ToolingTooling


OVERVIEWOVERVIEW

• Geometric TolerancingGeometric Tolerancing– Datum– Features

• Size• Location• Tolerances


ANNOUNCEMENTSANNOUNCEMENTS

Region IX IIE ConferenceOSU -- ATRC 101, 102

Awesome Design Lectureand Competition 3/3/00Lecture -- 2:30 - 3:20Watkins Center for International TradeCompetition 8:15 - 9:30Watkins Center for International Trade


IIE Student Conference IIE Student Conference DetailsDetails

• ScheduleSchedule• 9:15 – 10:00

– Facility Location Design (OU)– Alternative Route Effect on Turnaround Time –

Campus Shuttle System (UH)

• 10:15 – 11:00– Receiving at a Hardware Store– Integration of Security Monitoring and

Switchboard Operations at Norman Regional Hospital (OU)

• 11:45 – 12:30– Elementary School crossing Speed and Time (UH)– Improvement in Wiring and Examination of

Outsourcing of Componenets (TT)


IIE Student Conference IIE Student Conference DetailsDetails

• ScheduleSchedule• 2:45 – 3:45

– Performance Improvement in a Service Environment (St.M)

– Design and Development of a Graduate Application System (OSU)

– Setup Reduction at CNC Machining Centers (WSU)

– Main Conference Rm. 102– Use 101 for Overflow, Short In/Out

• Minimize Disturbance to Conference– Note: Non-paying guest– On-time, quiet, etc. …


Observations Observations

HomeworkOne Copy Submissions

Case Studies --

An opportunity to Perform Self-AssessmentInitial ReactionDealing with AvailabilityTeamwork/Self RelianceScheduling and OrganizationResources


QUESTIONSQUESTIONSTO START ??TO START ??


Jig and Fixture Design – Jig and Fixture Design – Quick Review (1)Quick Review (1)

• Must Arrest 6 (12) Degrees of Must Arrest 6 (12) Degrees of FreedomFreedom– Provide “Fixed” Location and Orientation

of Part in Space

• Location Surfaces/DatumLocation Surfaces/Datum– Must Use Those Specified on Drawing– Each Feature is Located from 3 Datum– Each Jig/Fixture Can Only Locate 3 Datum

• Multiple Datum Sets (for Different Features) May Require Multiple Tooling to be Designed and Built


Jig and Fixture Design – Jig and Fixture Design – Quick Review (2)Quick Review (2)

• ConsiderationsConsiderations– Principles

• 3-2-1• Maximum Separation• Minimum Contact

– Features• Drain Holes• Legs/Attachment to Machine Tool• Clamps (Forces into Locators, Activation

Time)• Visibility/Operator Access • Bushings (Jigs) – Type, Use• Replacement of Worn Parts


DRAWING - Fundamental DRAWING - Fundamental RulesRules

• From From Madsen, Madsen, Geometric Dimensioning Geometric Dimensioning and Tolerancingand Tolerancing, p. 11-12, p. 11-12– Every Dimension Has a Tolerance (except

for Reference, Maximum, Minimum, or Stock). Tolerances May be Applied Directly to the Dimension or Via the Title Block

– Dimensioning and Tolerancing Must be Complete.

– All Needed Dimensions must be Shown, No Redundant Dimensions, Minimize Reference Dimensions

– Dimensions Set By Part Function, Mating



• From From Madsen, Madsen, Geometric Dimensioning and Geometric Dimensioning and TolerancingTolerancing, p. 11-12, p. 11-12– Specify Part, Not Process, Use

Specifications– Can Include NON-MANDATORY (e.g.,

Shrink)– Arrange Dimensions for Readability– Use Dimensions (Not Gages, Codes)– 90o Implied When Not Stated Within

General Title Block Tolerance (Surfaces, Centerlines)

– All Dimensions at 20o C (68o F), Free State Conditions



• From From Madsen, Madsen, Geometric Dimensioning Geometric Dimensioning and Tolerancingand Tolerancing, p. 11-12, p. 11-12– Unless Otherwise Stated, Geometric

Tolerances Apply to Full Length, Width, Depth of Feature

– Dimensions Apply Where Specified on Drawing


DRAWING - Basic DRAWING - Basic DimensioningDimensioning

• Location DimensionsLocation Dimensions– Where, In Relation to Datum (Range)

• Size, Shape AllowedSize, Shape Allowed– Shape and Allowed Size Range

• Shape of Tolerance ZoneShape of Tolerance Zone• ApplicabilityApplicability

– Maximum Material Condition– Minimum Material Condition– Regardless of Feature Size

• Captured in Feature Control FrameCaptured in Feature Control Frame


DIMENSIONING TO CONVEY DIMENSIONING TO CONVEY FUNCTIONAL REQUIREMENTSFUNCTIONAL REQUIREMENTS• Dimensioning Must Reflect Part Dimensioning Must Reflect Part

Function, Mating PartsFunction, Mating Parts

Wilson, Figure 3-22, p. 44


DIMENSIONING PRACTICEDIMENSIONING PRACTICE• Avoid Double Dimensioning - Stack-upAvoid Double Dimensioning - Stack-up

Wilson, Figure 3-32a, p. 49


DIMENSIONING PRACTICEDIMENSIONING PRACTICE• Avoid Double Dimensioning - Stack-upAvoid Double Dimensioning - Stack-up

Wilson, Figure 3-32b, p. 49


DIMENSIONING PRACTICEDIMENSIONING PRACTICE• Reference DimensioningReference Dimensioning



DIMENSIONING PRACTICEDIMENSIONING PRACTICE• Tolerance InterpretationTolerance Interpretation

Wilson, Figure 34-50a, p. 89


DIMENSIONING PRACTICEDIMENSIONING PRACTICE• Tolerance InterpretationTolerance Interpretation

Wilson, Figure 34-50b, p. 89


DIMENSIONING PRACTICEDIMENSIONING PRACTICE• Tolerance InterpretationTolerance Interpretation• Conventional Dimensioning Sets Conventional Dimensioning Sets

“Square” Tolerance Zones - May “Square” Tolerance Zones - May Not Be Functionally CorrectNot Be Functionally Correct

SIZE, SHAPE OF TOLERANCE ZONEFOR POSITION OF CENTER OF MATINGPIN (BLUE,BLACK,PINK,AND ORANGE) IN HOLE (GREEN)


DIMENSIONING PRACTICEDIMENSIONING PRACTICE• Tolerance InterpretationTolerance Interpretation• Conventional Dimensioning Sets Conventional Dimensioning Sets

“Square” Tolerance Zones - May “Square” Tolerance Zones - May Not Be Functionally CorrectNot Be Functionally Correct

SIZE, SHAPE OF TOLERANCE ZONEFOR POSITION OF CENTER OF MATINGPIN (BLUE,,PINK,AND ORANGE) IN SLOT (GREEN)


GD&T DIMENSIONING GD&T DIMENSIONING • ConceptsConcepts

– Least Material Condition– Maximum Material Condition

– Represent the Acceptable Extremes of Part Surfaces/Material


GD&T DIMENSIONINGGD&T DIMENSIONING• External ( MMC and LMC)External ( MMC and LMC)



GD&T DIMENSIONINGGD&T DIMENSIONING• Internal (MMC and LMC)Internal (MMC and LMC)



GD&T DIMENSIONINGGD&T DIMENSIONING• Form Variation Within Perfect Form Form Variation Within Perfect Form

BoundariesBoundaries



GD&T DIMENSIONINGGD&T DIMENSIONING• Surface Elements - StraightnessSurface Elements - Straightness



GD&T DIMENSIONINGGD&T DIMENSIONING• Surface Elements - Axis StraightnessSurface Elements - Axis Straightness



GD&T DIMENSIONINGGD&T DIMENSIONING• Surface Elements - Hole StraightnessSurface Elements - Hole Straightness



GD&T DIMENSIONINGGD&T DIMENSIONING• Measuring StraightnessMeasuring Straightness



GD&T DIMENSIONINGGD&T DIMENSIONING• Virtual ConditionVirtual Condition



GD&T DIMENSIONINGGD&T DIMENSIONING• PerpendicularityPerpendicularity



GD&T DIMENSIONINGGD&T DIMENSIONING• AngularityAngularity



GD&T DIMENSIONINGGD&T DIMENSIONING• Feature Control FrameFeature Control Frame

Madsen, p. 320


GD&T DIMENSIONINGGD&T DIMENSIONING• SymbolsSymbols

Kalpakjian, Figure 35.27a, p. 1060


GD&T DIMENSIONINGGD&T DIMENSIONING• SymbolsSymbols

Kalpakjian, Figure 35.27b, p. 1060


GD&T DIMENSIONINGGD&T DIMENSIONING• SamplesSamples




Madsen, p. 297


QUESTIONSQUESTIONSOR OR

CLARIFICATIONS CLARIFICATIONS ??????

industrial processes ii industrial processes ii inden 3313 lecture 10 -- geometric tolerancing and...

Documents

geometric dimensioning

geometric tolerances

centerlinesall dimensions

shrinkarrange dimensions

readabilityuse dimensions

redundant dimensions

needed dimensions

time uhimprovement