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GD&T Essentials

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GD&T Essentials

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Geometric tolerancing basics

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Cristina Picado Salmerón
Cristina Picado Salmerón
Costa Rica

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GD&T Essentials
 

GD&T EssentialsOnline version

Geometric tolerancing basics

by Cristina Picado Salmerón
1

Slide 1: What is GD&T?

Geometric Dimensioning and Tolerancing (GD&T) is a symbolic language used on engineering drawings to describe allowable variation in form, orientation, and location of features.

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Slide 2: Why GD&T matters

GD&T communicates precise design intent, improves part interchangeability, reduces misinterpretation, and guides manufacturing and inspection for quality control.

3

Slide 3: Core Symbols

Key symbols include position, true position, concentricity, symmetry, and runout.

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Slide 4: Feature Control Frame

A Feature Control Frame specifies tolerances and datum references in a compact box attached to features.

5

Slide 5: Datums and Datum Planes

Datums establish a reference frame. They define X, Y, Z directions and establish the order of precedence for measurements.

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Slide 6: Tolerancing Concepts

Understand MMC (maximum material condition), LMC (least material condition), and RFS (regardless of feature size).

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Slide 7: True Position

True position defines the exact theoretically perfect location of a feature relative to datums.

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Slide 8: Tolerance Zones

Tolerance zones indicate where a feature must lie or how much it may vary from nominal size or location.

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Slide 9: Projected Tolerances

A projected tolerance zone accounts for part assembly height, preventing interference with mating parts.

10

Slide 10: Practical Tips

Keep datum selection logical, avoid over-tolerancing, use MMC/LMC, and verify inspection methods align with GD&T requirements.
 
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