GD&T [per the ASME Y14.5-2009 and 1994 Standards and the Differences between them] 

December 06- 08, 2010   2 ½ days

This comprehensive ASME Y14.5 training is for all job categories (and is the suggested prerequisite course for all advanced GD&T course). This is an introductory, but comprehensive, applications-based training program for all technical personnel who must interpret and apply geometric dimensioning and tolerancing.  This course covers GD&T principles, rules and applications, as well as the new Y14.5-2009 symbology. 

The goal of this course is not only to give the participants a comprehensive knowledge of GD&T techniques but, through the use of lectures, discussion, case histories and application problems, the ability to apply these techniques to their product line.

This course shows how to interpret design drawings and CAD representation of product definitions that use the ASME Y14.5-2009 and 1994 standards.  It also explains step-by-step procedures to apply the Y14.5 practices and allow dimensioning and tolerancing professionals to express their design requirements more clearly.  The results are that product representations are able to be more specific in conveying tolerancing needs, products can be more easily manufactured, and appropriate inspection techniques are clarified.

This course allows the participants the opportunity to learn and apply techniques in datum selection and tolerancing optimization.  It introduces techniques in calculating more producible tolerances, choosing practical datum structures and then shows how to measure each requirement.  Do’s and don’ts of proper tolerancing are taught and reinforced in every segment of the course by showing how they apply to realistic assembly tolerancing conditions. 

The principles presented in this course will help you interpret and apply the ASME Y14.5-2009 and 1994 standards, reduce drawing changes, reduce interpretation errors, bid contracts with confidence, design for maximum producibility, increase part tolerances and assure mating parts will assemble.

Course Outline

·GD&T Basic Principles:  rules, datum selection criteria, fixed and floating fastener formulas and do’s and don’ts for Geometric Characteristic Symbols.  A lecture and discussion on the major principles of geometric dimensioning and tolerancing will be given by presenting a simple assembly of mating parts and applying geometric controls to each part in the assembly.  Discussed are:  the effects of Maximum Material Condition (MMC), Least Material Condition (LMC), Regardless of Feature Size (RFS implied), Maximum Material Boundary (MMB), Least Material Boundary (LMB) and Regardless of Material Boundary (RMB implied) concepts, Inner and Outer Boundaries, Virtual Condition and Resultant Condition of features of size, and gage design for position controls.

·Geometric Characteristics and their Inspection:  All 14 geometric characteristic symbols will be explained in a food chain of symbology to show how each symbol relates to the others for control of size, form, orientation, profile, runout and location.  Geometric characteristic symbols covered include: flatness, straightness, circularity, cylindricity, perpendicularity, angularity, parallelism, profile of a line, profile of a surface, circular runout, total runout, concentricity, symmetry and position.  This will give each participant a perspective of how to choose exactly the right characteristic for every step of the part definition.  Inspection of all characteristics will be discussed and several options shown for each.

·Datum selection, choosing the perfect geometric characteristic for parts and assemblies; fixed fastener assembly mating part tolerance formulas and the effects of modifiers (MMB, LMB and RMB after datum features) are also emphasized:   A more complex assembly will be used to explain the proper selection of datum features and a linear progression of geometric controls.  The fixed fastener and floating fasteners formulas will be thoroughly explained and used to calculate and distribute geometric tolerances for maximum manufacturability and functionality.  Process capability, producibility and functional product requirements are considered and shown to work in tandem to create the best tolerancing scheme possible. Threaded holes, positional tolerancing, projected tolerance zones and inspection techniques are discussed.

·Producibility and Measurement Considerations:  how manufacturing processing can influence datum selection without adversely affecting part functionality; how to correctly distribute tolerances in an assembly to reduce difficulties in part manufacture; how to imply a manufacturing procedure and create a measurement plan.

·Holding Direct vs. Indirect Functional Relationships in an Assembly:  The instructor will explain how important functional relationships can be held using different datum structures.  How to increase tolerances by proper datum selection is also discussed.

·Application of Common Tolerancing Methods and Datum Structures:  A series of application problems are used to build participants’ knowledge and confidence in applying common datum approaches and tolerancing methods, as well as applications problems for circular surfaces, planar surfaces, free form surfaces, datum targets, free state variation, concepts for tolerancing elongated holes and positioning other oddly configures features.

·Commonalities in Tolerancing Approaches for Dissimilar Part Geometries:  Profile of a surface all-around and all-over, composite vs. two single segment position controls, perpendicularity of center planes; simultaneous gaging vs. separate gaging requirements, analyzing geometric tolerances, angular orientation datums, analyzing tolerances for minimum and maximum axial separation, wall thickness calculations, and housing requirements.

·Design, Dimensioning and Tolerancing of Functional Gages and Fixtures.  Quality Assurance Strategies and Measurement Planning

·Converting from Plus and Minus Tolerancing to Positional Tolerancing

·Composite Position vs. Two Single Segment Positional Tolerancing

·Composite Profile vs. Two Single Segment Profile Tolerancing

·Applying Position Tolerances to a Complex Assembly with Multiple Datum Structures for Floating and Fixed Fastener Assembly Conditions

·New Concepts in Y14.5-2009:  New symbology and rule changes; Moveable datum target symbol; Datum translation symbol; Specifying degrees of freedom symbology; Calculating the correct Material Condition Boundaries (Maximum Material Boundary-MMB, Least Material Boundary--LMB and Regardless of Material Boundary--RMB); Datum feature BASIC symbology; Specifying the desired material boundary; Datum feature patterns referenced at MMB, LMB, RMB; Oddly configured datum features; Datum feature simulators(Theoretical and Physical); Irregular datum features of size; Repetitive patterns; Two- and three-level composite position and profile controls.

Tolerance Stack-Up Analysis

December 8 – 10, 2010  2 ½ days

This course is directed to anyone with the professional responsibility of analyzing or applying tolerances to assemblies, or anyone seeking a more thorough understanding of tolerance analysis. Attendees should have a basic working knowledge of ASME Y14.5. [Each course participant needs to bring a hand-held calculator.]

Course participants will be trained to apply tolerance stack-up analysis techniques to a wide variety of assemblies, from the very simple to the more complex situations commonly faced in industry today. Both plus and minus and geometrically toleranced assemblies will be examined and stack-up analysis taught and practiced on each. Many different datum structures will be discussed and analyzed. The concepts taught in this course are: loop analysis (also known as circuit diagrams), number charting, virtual condition, resultant condition, inner and outer boundaries minimum airspace, maximum wall thickness, maximum interference, minimum and maximum overall dimensions, fixed and floating fastener assembly conditions, projected tolerance zones, the logic of stack-up analysis, statistical tolerancing, and much more.

Through this course, participants will be able to:  Calculate minimum and maximum wall thickness, airspaces and interferences for assemblies; Create loop analysis/circuit diagrams for tolerance stack-up analysis for both plus and minus toleranced dimensions and geometric tolerances; Create both simple and complex number charts for stack-up analysis using a variety of geometric tolerances, basic dimensions, resultant conditions, virtual conditions and plus and minus toleranced dimensions; Do tolerance stack-up analysis for floating fastener situations for clearance holes, screws and shafts; Do tolerance stack-up analysis for fixed fastener situations using screws, clearance holes, slots, tabs, overall dimensions and projected tolerance zones for threaded holes; Calculate minimum and maximum gaps for assemblies that use a variety of datum structures; Learn a system of logic and mathematics to analyze tolerances; Calculate the effects of angular stack-up using trigonometry and proportions;  Calculate statistical tolerance using a variety of methods and learn how to re-integrate these tolerances back into the assembly’s details.

COURSE OUTLINE:

THE BASICS    Where to begin a stack; Designating positive and negative routes; What are you calculating? What dimensions are factors; How to push the parts to create the worst case; Which geometric tolerances are and are not factors; Finding the mean; Calculating boundaries for GD&T, MMC, LMC and RFS Material Condition modifiers; Mean boundaries with equal bilateral tolerances

STACK-UP ANALYSIS OF AN ELEVEN-PART ASSEMBLY USING PLUS AND MINUS TOLERANCING  The calculations; The loop analysis chart; The numbers analysis chart; Finding MIN and MAX gaps

VERTICAL vs. HORIZONTAL LOOP ANALYSES FOR FEATURES OF SIZE  Where to start and end; Graphing the loop; Minimum and maximum gap analysis

ASSEMBLIES WITH PLUS AND MINUS TOLERANCES  Multiple dimension loops; Positive and negative values; Airspace vs. interferences

FLOATING FASTENER FIVE-PART ASSEMBLY ANALSYIS  Resultant conditions; Virtual conditions; Inner and Outer boundaries; Mean boundaries; Converting to radii; Mixing widths and diameters; Complex loop analyses with geometric dimensioning and tolerancing

FIXED FASTENER ASSEMBLIES  Calculating overall minimum and maximum assembly dimensions; Mixing slots, tabs, holes and shafts; Calculating minimum and maximum gaps within the assembly; Projected tolerance zones for total runout as a factor; Determining if geometric tolerances are a factor; Ruling out features and patterns as factors

A RAIL ASSEMBLY  Threaded features; Multiple geometric controls; Projected tolerance zones; Gaps with and without perpendicularity as a factor; Calculating interference; Theoretically vs. physically worst case possibilities; When logic becomes an integral step; Factoring in assembly conditions

SINGLE-PART DESIGN  Two-single segment positional controls; Switching datum reference frames and accumulating geometric tolerances; Datum features at MMC (pattern shift); Profile tolerances; Flatness; Envelopes of perfect form at MMC; Creating envelopes of perfect orientation at MMC; MIN and MAX axial separation; Datum planes vs. datum features; Separate requirements and accumulating tolerance; Tolerances in degrees; Trigonometric function introduction; Composite positional tolerancing

FIVE-PART ROTATION ASSEMBLY ANALYSIS  Position; Perpendicularity; Parallelism; Profile; Flatness; Threaded holes with projected tolerance zones; Mounted screws; Part-to-part analysis (from two parts to an infinite number of parts); Runout; Total runout; Concentricity; Positional coaxiality; Simplifying a complex assembly; Determining assembly housing requirements; Radial clearance MIN and MAX calculations; Interference calculations

TRIGONOMETRY AND PROPORTIONS IN TOLERANCE STACK-UP ANALYSIS  Rocking datum features; Constructing a valid datum; Consideration of differing orientations from measurement to assembly; An in-depth assembly analysis using trigonometric functions; Computer programs vs. a personal analysis; Vertical stacking as it effects horizontal housing requirements; When stacked parts are not flat or parallel; Formulae to calculate worst case fit conditions when trigonometry is a factor; Using proportions and trigonometry to calculate fit conditions beyond the GD&T formulae

THE THEORY OF STATISTICAL PROBABILITY   Gaussian frequency curve; Standard deviations; Plus or minus 3 Sigma; Root sum square formula; Steps to calculate and apply statistical tolerances; Statistical tolerancing applied to plus and minus toleranced assemblies; Statistical tolerancing applied to geometrically toleranced assemblies; When best to allow statistical tolerances and when it should not be allowed; The logic of statistical tolerancing; Modifying the root sum square formula with a safety/correction factor;  . . . and probably the most critical topic, re-integrating the statistical tolerance into the assembly

TO REGISTER:  Print out and complete the Registration Form and mail or fax to (615) 824-5262 or call (615) 824-8644 to register.  PREPAYMENT required. We accept Visa/MasterCard/AMEX, company Purchase Order, check or money order. 

To inquire about scheduling an on-site workshop for any of our courses, contact our Marketing Director at (615) 824-8644 or JWinchell@geotolmeadows.com. ]

Disclaimer: In some instances, due to circumstances beyond our control we may need to cancel or postpone a class. James D. Meadows & Associates, Inc., cannot be held responsible for cancelled airfares, cancelled hotels or any other expenses incurred by the student due to cancellation of a class.  We reserve the right to cancel or reschedule any event.  However, if James D. Meadows & Associates, Inc. cancels the course, you will be notified immediately and full refunds will be issued.  In most instances, we will know 2 to 3 weeks prior to the scheduled class date whether a given class is a go or is cancelled.

Cancellation Policy: SUBSTITUTIONS: Attendee substitutions can be made at any time prior to start date of the course. CANCELLATIONS: 100% of the course fee will be refunded if Cancellation notice is received within 15 calendar days before the start date of the course. If the cancellation is made fewer than 15 days prior to the first day of the class, the registration fee is due and payable in full to James D. Meadows & Associates, Inc. It is then advisable to send a substitute to the course. Registrants who fail to attend on the date of the course are responsible for the entire course fee.

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