Advanced Geometric Dimensioning & Tolerancing (GD&T)

Advanced GD&T Course Summary Description
  • Build your understanding of how the geometric language is applied to real parts
  • Dive into an explanation of key topics through applications, exercise and calculations
  • Explore advanced concepts not covered in the Basic course
  • Apply geometric tolerancing to control features and ensure functionality
  • Perform tolerance stack-up analysis to assign critical tolerances
Advanced GD&T Course Description

Like any language, this deeper understanding is built off the fundamentals. The Advanced course goes into greater depth of many concepts to promote understanding, build awareness of additional tools not covered in the Basic course, and helps students understand how the geometric language is applied to real parts, and its ramifications on design and documentation. Advanced concepts, deeper explanation of key topics, applications exercises and calculations are performed individually and in teams.  The Advanced course reinforces fundamentals, discusses pros and cons of various strategies and their effects on downstream processes, and provides applications-based exercises where students apply what they have learned.  This course addresses the consequences of various product definition strategies on part function. Application and implications of functional dimensioning and tolerancing schemes on mating parts in assemblies are emphasized throughout the course.

The emphasis of the Advanced course is on helping students learn how to apply GD&T to achieve the mating and functional requirements of parts, to understand the pros and cons of various approaches, and to gain experience working with more advanced applications. Students will expand their understanding of the implications of their specifications on function, manufacturing, inspection, and quality. The Advanced course introduces the topic of tolerance stack-ups. Anyone looking for a deeper understanding of how to apply geometric tolerancing and perform tolerance analysis will greatly benefit from this course. Even with an understanding of the fundamentals of GD&T such as datums, position with MMC and RFS modifiers, parallelism, profile etc. users typically still lack the intimate knowledge of how to expertly and confidently apply geometric tolerancing and perform tolerance stack-up analyses to clearly define and optimize their product designs.

Pre-Requisite for Advanced GD&T: At least one Basic GD&T workshop/course is highly recommended as a prerequisite. It’s essential that individuals understand the underlying principles that the Basic course is focused on teaching.

Course Outline:
  • Position
    • Applications for MMC, RFS & LMC material modifiers
    • Composite tolerancing – one datum feature reference, two datum feature references
    • Dual segment position tolerancing
    • Cylindrical tolerance zone, rectangular tolerance zone, spherical tolerance zone, conical tolerance zone
    • Position for irregular features of size
    • Virtual condition & resultant condition
    • Position verification at MMC, LMC
  • Datum review
    • Datum reference frames and degrees of freedom, datum feature simulators
    • Establishing DRFs:  planar surfaces; plane, axis, plane; axis, plane, center plane
    • Datum feature precedence
    • Customized datum reference frame
  • Datum feature modifiers
    • Datum feature modifiers – MMB, LMB, and RMB
    • Development of DRF at MMB, MMB; comparison between modifiers
    • Simultaneous requirements
    • Secondary datum feature at MMB; tertiary datum feature at MMB; calculating allowable datum feature shift
    • Applications for datum feature modifiers
  • Advanced Datum reference frame concepts
    • Moveable datum targets
    • Rotational control
    • Translation modifier
    • Applications and establishment of the DRF
  • Advanced profile control concepts
    • Free state variation, non-rigid parts
    • Non-uniform profile
    • Composite profile – one datum feature, two datum features, irregular features
    • Profile for coplanarity & multiple profile controls
  • Coaxial tolerances
    • Comparison among circular runout, total runout, position, profile, concentricity, and symmetry
    • Applications of various coaxial tolerances
  • Boundaries
    • Boundaries RFS, MMC, LMC
    • Inner & Outer boundary stack-up calculations
  • Introduction to Tolerance Stack-Ups
    • Design practice
    • The tolerance stack-up chain
    • Preliminary tolerance assignment
    • Analysis and assignment methods
    • Geometric controls in tolerance analysis
Modes of Teaching and Learning:
  • Lecture/discussion
  • Individual work sessions
  • Group work sessions
  • Large print review
  • GeoTol Pro Fundamentals Workbook; Technical Consultants Incorporated
Who Should Attend:
  • CAD draftspersons, tool designers, technical inspectors, mechanical engineering technicians, machine shop and tool room supervisors. Design, manufacturing and project engineers, quality control personnel, engineering managers and supervisors will also find this workshop beneficial.

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