Geometric Dimensioning & Tolerancing

(GD&T) 23-24th Aug 2017

For: Virtue Technology Sdn BhdAddress: PLOT 202, Lorong Per. Bukit Minyak 11, Kaw Per. Bkt Minyak, 14100 Bukit Tengah, Penang

Presented by: Timothy WooiFor: JMC Group of Companies

Geometric Dimensioning & Tolerancing (GD&T)

Day-2, MorningSimultaneous Requirements for Combined parts Profile Controls

Profile tolerancing- Computation of holes in relation to leading hole in various materials condition.

Composite Position Tolerance

- Application of the condition to achieve better machine settings.

Exercise

Computation and interpretation

Geometric Dimensioning & Tolerancing (GD&T)

Two Single Segment Feature Control Frame- Interpretation and understanding- Exercises and examples - Assessment test: -Using GD&T on various component, interpret fabrication of parts successfully considering business factors.

Day-2, Noon

Geometric Dimensioning & Tolerancing (GD&T)

Inspection for proper Tolerances & Dimensioning- Appropriate and correct approach of during inspection. - Correct position and method of measurement of parts based on the technical drawings. - Datum & relevant Selection - Definition of datum reference frame –

Definition of datum reference points -Decision Diagrams Study of Sample Drawings -Exercise and Workshop: Interpretation of sample mechanical drawings. -Convert from +/- to true position tolerancingConclusion and Q & A session

End of day 2

Why GD&T?

(Based on ASME Y14.5M-1994)

Geometric Dimensioning & Tolerancing (GD&T)

To allow Participants to master techniques of GD&T in the ASME standard to;

integrate smoothly into engineering design applications and modern inspection systems at work.

Provide Participants with Fundamental concepts of GD&T to express, understand and interpret drawing requirements using GD&T to ANSI / ASME Y14.5M Standards.

In-depth knowledge of GD&T application allows optimum form, fit & function between the various complex pieces of parts assembly.

Starting with basic principles in coordinate dimensioning & tolerancing and progressing on these principles to understand & apply GD&T requirements to ad concepts to real work applications.

Application & Advantages of GD&T

Geometric Dimensioning & Tolerancing (GD&T)

Review of Day 1GD&T Rules Based System

The Definitions

Geometric Dimensioning & Tolerancing (GD&T)

Fundamental Rules. -application examples on sizes

and dimensions. Dimensioning and tolerancing

philosophy.

There are some Fundamental Rules that need to be applied.These can be found on the GD&T Rule Based System.

Fundamental Rules

Exercises

Geometric Dimensioning & Tolerancing (GD&T)

Rules for Drawing and DesignsEnvelope Principle.

• Rules for Gear and Splines.

• Regardless of feature size.(RFS) settings

• Maximum Material Condition (MMC)

• Least Material Condition (LMC).

• Virtual Condition and Resultant Condition.

Geometric Dimensioning & Tolerancing (GD&T)

Rules

Review of Day 1GD&T Rules Based System

Common Symbols in GD&T.

List of symbols and their interpretation Assessment

Common Symbols in GD&T

Exercise

Study of tolerancing condition

Maximum Material Condition (MMC),

Least Material Condition (LMC) and

Regardless of Feature Size (RFS)

application and interpretation

GD&T Symbols

Standards for GD & T. – ASME, - ISO, - Din

ASME StandardsASME Y14.5 – Dimensioning and TolerancingASME Y14.5M-1994 Dimensioning and TolerancingASME Y14.5.1M-1994 Mathematical Definition of Dimensioning and Tolerancing Principles

Many multi-national corporations use ASME Y14.5 (ASME Y14.5M-1994 or ASME Y14.5-2009) as their GD&T standard worldwide for all of their international operations.

The ASME Y14.5 standard is considered the authoritative guideline for the design language of GD&T.

ASME Y14.5-2009 is a replacement of ASME Y14.5M-1994.

ISO 1101:2004 Geometrical Tolerancing.

Standards for GD & T. – ASME, - ISO, - Din

The International Organization for Standardization (ISO) also has a version of GD&T, which they call ISO 1101 Geometrical Dimensioning and Tolerancing (GD&T).

At present the ISO standards do not recognize the interpretation of concentricity and symmetryas defined in the ASME Y14.5M 1994 standard.

The concentricity and symmetry characteristics in ISO have the same interpretations as the position characteristic in the ASME Y14.5M 1994 standard.

Simultaneous Requirements for Combined parts

Profile tolerancing- Computation of holes in relation to leading hole in various materials condition.

Geometric Dimensioning & Tolerancing (GD&T)

Day-2, Morning

Profile Control

Simultaneous Requirements for Combined parts

Composite Position Tolerance

- Application of the condition to achieve better machine settings.

Geometric Dimensioning & Tolerancing (GD&T)

Day-2, Morning

Position Control

Simultaneous Requirements for Combined parts Exercise

Computation and interpretation Envelope Principle.

• Rules for Gear and Splines.

• Regardless of feature size.(RFS) settings

• Maximum Material Condition (MMC)

• Least Material Condition (LMC).

• Virtual Condition and Resultant Condition.

Geometric Dimensioning & Tolerancing (GD&T)

Exercise, Rules

Day-2, Morning

Day-Two Noon

Geometric Dimensioning & Tolerancing (GD&T)

Inspection for proper Tolerances & Dimensioning- Appropriate and correct approach

of during inspection. -Correct position and method of measurement of parts based on the technical drawings. -Datum & relevant Selection -- Definition of datum reference frame –

Dimension

Day-Two Noon

Geometric Dimensioning & Tolerancing (GD&T)

Definition of datum reference points -Decision Diagrams Study of Sample Drawings

Datum new

Day-Two Noon

Geometric Dimensioning & Tolerancing (GD&T)

Exercise and Workshop: Interpretation of sample mechanical drawings. -Convert from +/- to true position tolerancingConclusion and Q & A session End of day 2

Datum new

Thank You!

End of Day 2

Geometric Dimensioning & Tolerancing (GD&T)