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Level 2: Advanced Geometric

Dimensioning and Tolerancing  

[per ASME Y14.5M-1994]


A fail-safe system for applying Geometric Symbology targeted at everyone ever trained in GD&T and who has suffered the frustrating aftermath of trying to apply it ‘back on the job’.


Through this course, participants will . . .


·Engage in a unique step-by-step dimensioning and tolerancing process.  This process consists of specific questions to be asked that consider functional requirements, manufacturing options and quality procedures, and lead from the best possible beginning to the natural completion of a product’s geometric definition.


·Learn to visualize manufacturing and inspection procedures based on  Dimensioning and Tolerancing symbology used.


·Learn the logic and analytical reasoning required to step anyone through to their product’s optimal GD&T completion.


·Learn to preserve and improve part functionality while dramatically reducing manufacturing costs.


·Apply this systematic procedure of geometric definition to the participant company’s product line.


·Reinforce and refresh knowledge gained in prior basic GD&T training courses.


Who Should Attend?  This course is directed to design, drafting and engineering personnel or anyone wishing to gain an advanced knowledge of applying Geometric Symbology to products.  It is for those wishing to learn a unique systematic approach in applying geometric parameters within which a product must conform to function.


What Will This Course Cover?  This course will:


·Refresh and reinforce information gained in prior courses taken in GD&T and through on-the-job usage.


·Teach a unique systematic approach to product definition using Geometric Symbology to improve functionality and reduce cost.


·Show alternative methods that incorporate manufacturing and/or inspection concurrent engineering requirements.


·Encourage participants to engage in Mr. Meadows’ unique step-by-step dimensioning and tolerancing process.  This process consists of specific questions to be asked and answered that lead from the best possible beginning to the natural completion of a product’s geometric definition.


·Apply advanced techniques to optimize the participant’s products.


·Learn techniques that use basic principles existing in ASME Y14.5, but extend the principles…and far exceed the applications shown.


·Work on ‘real world’ and more complicated parts not found in examples shown in ASME Y14.5.


·Learn not only how to use Geometric Symbology, but when to use it and when NOT to use it.  Learn why use it and in what order.


·Learn why certain choices of symbology complicate manufacturing and inspection procedures while others simplify them.


Course Length:  We recommend a course length of 3-4 days.  Participants should have completed a basic 4-day course in the Dimensioning and Tolerancing of parts or have equivalent work experience.



Tailored Course Outline   The use of a sample packet of your product drawings is a key element of this course as a guide to the tailoring of information covered.  We wish to optimize time spent in this course; therefore, a sample packet representative of your products’ geometric shapes is requested prior to the workshop for the instructor to study/incorporate into his lesson plan.


The quality of the use of Geometric Symbology or even a total lack of use of Geometric Symbology on these drawings when provided to the instructor is of secondary importance to the instructor.  He is most interested in the potential use of geometric controls to improve product function, reduce part cost, increase completeness of definition and the improvement of your product drawings into legally-defensible documents representative of your functional requirements.  


This course deals specifically with the application of optimal geometric controls on your products and ‘real world’ parts and products.  This workshop focuses on design applications of Geometric Symbology.  It uses the concepts and step-by-step procedures for product definition developed specially by Mr. Meadows while working as a consultant on thousands of product lines in every conceivable industry.  


General Course Outline by James D. Meadows for:

Advanced Practical Design Techniques for Rigid Parts

per ASME Y14.5M-1994


1)    Advanced GD&T [Design Techniques]  The focus of this portion of the course deals specifically with the application of      

     optimal geometric controls on ‘real world’ parts and products


GD&T Review (See Item 2 on the next page)


Applications-Based Training (Problem Solving and Assemblies)

  ·The Fail-Safe Approach – how it’s done

  ·The philosophy and logic behind the step-by-step procedure for applying Geometric Symbology

  ·Traversing the maze – key to the locked doors

  ·Function/Quality/Production/Inspection;  One team – One Job – One Goal

  ·How to visualize part production based on Geometric Symbology

  ·Considering options through the process of elimination

  ·Weighing production vs. inspection costs created by different approaches

  ·Reducing the need for Material Review Boards


Starting Over

  ·Redesigning of original mating parts

  ·Converting from plus and minus to geometric tolerancing in assemblies

  ·Datum selection based on physical contact and alignment in the assembly

  ·Tolerancing based on manufacturing capability and cost reduction


Rotating Assembly Tolerancing

  ·Datum selection based on balance, alignment and load

  ·Sequencing of geometric characteristics in the assembly


Reading Feature Control Frames as Sentences

  ·Functionality conveyed through symbology


Producibility Considerations

  ·How manufacturing processes effects datum selection

  ·Implying a manufacturing sequence


Direct vs. Indirect Tolerancing in an Assembly


Preserving Functionality through Linear Segmented Tolerancing


Clear, Concise Tolerancing Methodology


Complex and Varied Geometries Toleranced for FIT


Logic-Based Tolerancing in Assemblies


Weighing Advantages and Disadvantages of Geometric Controls


Achieving Functionality through Datum Selection


Analytical Reasoning in Geometric Characteristic Selection


Applications-Based Geometric Tolerancing


Inspection-Based Tolerancing Methods to Assure Functionality


Great Yields through Multiple Controls


Optimizing Feature Control Frames


Gaging and Fixturing


Multiple Controls and Optimized Tolerances

  ·Composite positional tolerancing vs. multiple single segment position controls

  ·Composite profile tolerancing vs. two single segment profile controls

  ·Zero tolerancing at MMC (when TO and NOT TO use it); Allowing inspection to pass everything that functions


Complex Datums – Part Stabilization & Where to Measure From

  ·Datum features of size (tolerance zone growth vs. tolerance zone movement)

  ·Simultaneous and separate functional requirements

  ·Datum targets on irregular surfaces


Sheet Metal & Flexible Parts/3-D Surfaces

  ·Profile for controlling Size, Form, Orientation & Location of irregular shapes

  ·Partial datums; Step datums; Equalizing datums

  ·Sheet metal and plastic parts ( Free state variation; Part definition; Datum selection; Hole pattern location)

  ·Mating part design

  ·Restrained state controls

  ·Unusual and complex parts (datum selection)


Material Preservation – Castings, Wall Breakout and Binding

  ·LMC principle (unique effects on controlled features)

  ·Resultant condition

  ·Minimum wall thickness calculations


The Boundary Concept for Tolerance Analysis and Verification


        Applying ‘The System’ to your Parts

  ·Actual part prints with assembly drawings; Work on client company product drawings; Application of concepts to ‘real world’




    2) GD&T Basic Principles [Review]   Review of essential principles and topics selected by course participants at the beginning of the first day’s session from the following Basic GD&T topics:

  ·Principles of Geometric Definition


  ·Form Tolerance

  ·Orientation Controls

  ·Profile Characteristics

  ·Runout Tolerance


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