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The Datum Reference Frame
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The Geometric Tolerancing Fundamentals program is an in-depth study designed to develop a basic working knowledge in geometric dimensioning and tolerancing (GD&T). It is delivered per the ASME Y14.5M, 1994 standard. This program has been presented and refined over the past 25 years and covers what personnel need to know in order to work in an industrial environment on a daily basis. The course includes emphasis on all the basics, such as the rules, measurement theory, the datum reference frame, form, orientation, profile and positional tolerancing. The program materials contain a variety of computer color animated graphics, video clips and plastic models which allow the students to clearly understand the concepts.
There is extensive discussion on the use of the datum reference frame and the application of the feature and datum MMC, LMC and RFS modifiers. There are many workshop problems where the participants must complete position and profile verification exercises, datum selection exercises and solve virtual/resultant and IB/OB size calculations.
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Development of a Datum Reference Frame
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The program approaches the subject from the "practical world" with the use ofwood/plastic models that simulate parts, gages and inspection equipment. The basic philosophies of how, when, and where to apply geometrics along with common sense tips for producing quality parts are included. Discussion also covers the application of geometric tolerancing to design, manufacturing and quality control. Upon completing this program the students
will have a solid foundation in the fundamentals of
geometric tolerancing.
The Fundamentals program has been delivered and refined for the past 25 years and covers what you need to know on an every day basis.
Geometric Tolerancing Fundamentals
Program Outline
 The program is loaded with practical hands-on examples.
Color animations match the pictures in the programmed student workbook.
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The effect of feature modifiers, RFS, MMC and LMC.
 See example
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Introduction to Geometrics
- Orientation, History, and Theory
- ASME Y14.5M & Y14.5.1M, 1994 and International Standards
- Symbols, Terms, and Modifiers (MMC, LMC & RFS)
- Taylor Principle
- Features and Feature Control Frames
- Virtual/Resultant Size
- Measurement Principles and inspection techniques
- Fundamental Rules
Datums
- Datum Reference Frame
- Datum Precedence
- Functional Selection and Establishment
- Effect of Datum Feature Modifiers
- Datum Targets
- Interrelationship of Datums and DRF’s
- Simultaneous vs. Separate Requirement
Form, Orientation, Profile, Runout, Concentricity and Symmetry Tolerances
- Straightness, Flatness, Circularity, Cylindricity
- Parallelism, Perpendicularity, Angularity
- Runout (Total and Circular)
- Definitions and Explanations
- Coaxial Controls
Profile and Position Tolerances
- Profile for location
- Position Verification Exercises
- Position Tolerance
- Position Theory
- Position Verification Exercises
- Projected Tolerance Zone
- Zero Tolerancing
- Composite Tolerancing
- Fixed and Floating Fastener Calculations
- IB & OB calculations
- Inspection Techniques and Functional Gages
Geometric Tolerancing Fundamentals Program
Sample Graphics
Full page, color animated graphics make the concepts come alive and easy to understand.
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