GD&T Quiz

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to Lesson

Podcast

Play an AI-generated podcast conversation about this lesson
Download our mobile app to listen on the go
Get App

Questions and Answers

What does GD & T stand for?

  • General Development & Technology
  • Geometric Dimensioning & Tolerancing (correct)
  • Global Design & Testing
  • Geometric Distancing and Tolerating

What are the five part geometry features controlled by GD & T?

Form, Orientation, Location, Position, Runout

GD & T ensures ________ of parts during assembly.

interchangeability

Flatness tolerance is used to control the shape of a surface.

<p>True (A)</p> Signup and view all the answers

Match the following form tolerances with their descriptions:

<p>Straightness = Control the form with reference to Ideal shape Flatness = Control the form of a surface to be flat Roundness = Control the form of a circle or cylindrical part Cylindricity = Control the overall form of a cylinder</p> Signup and view all the answers

Flashcards are hidden until you start studying

Study Notes

Geometric Dimensioning and Tolerancing (GD&T)

  • GD&T is an international standard to specify Form, Fit, and Function of parts, following ANSI Y 14.5 and ISO 1101.
  • It provides significant improvement over traditional tolerancing by focusing on 3D part geometry features in addition to 2D drawings.

Importance of GD&T

  • Ensures specification of design tolerance requirements.
  • Ensures interchangeability of parts during assembly.
  • Provides standardization and uniformity.
  • Adaptation to 3D CAD modeling leads to high productivity, less rework, and reduced cost.

Part Geometry Features to be Controlled

  • Form
  • Orientation
  • Location
  • Position
  • Runout

Geometric Tolerance Symbols

  • Tolerance feature frame is used to specify tolerances.

Form Tolerances

  • Control the form with reference to ideal shape.
  • Applies to Line, Arc, Circle, Profile, Surface.
  • Tolerance is a Peak-to-Valley measure.
  • Types of Form Tolerances:
    • Straightness
    • Flatness
    • Roundness (Circularity)
    • Cylindricity
    • Profile of Line
    • Profile of Surface

Orientation Tolerances

  • Specifies relative orientation (attitude) between entities, such as edges, axes, surfaces, and features.
  • Always need a Datum (Reference), such as a plane or feature.
  • Types of Orientation Tolerances:
    • Parallelism
    • Perpendicularity
    • Angularity

Location Tolerances

  • Specifies relative location (attitude) between entities, such as edges, axes, surfaces, and features.
  • Always need a Datum (Reference), such as a plane or feature.
  • Types of Location Tolerances:
    • Concentricity

Material Condition Modifiers

  • Maximum Material Condition (MMC): largest shaft size and smallest hole size.
  • Regardless of Feature Size (RFS): no size variation considered.
  • ANSI/ISO recommends assuming a feature is perfect (ideal) at MMC.

Position Tolerance

  • Controls position (centre or axis) of holes.
  • Needs Datums, including Primary, Secondary, and Tertiary.
  • Tolerance Zone: Circular or Rectangular.

Run Out Tolerance

  • Primarily for cylindrical rotating parts.
  • Types of Run Out:
    • Circular Run Out
    • Total Run Out

Functional Gaging

  • Tests the combined effect of all tolerances, including dimensional and geometric tolerances.
  • Gage: Extreme Virtual Size.

Studying That Suits You

Use AI to generate personalized quizzes and flashcards to suit your learning preferences.

Quiz Team

More Like This

Geometric Dimensioning and Tolerancing Rules
15 questions
GD&T Terminology Quiz
30 questions
Basic Geometric Terms Flashcards
25 questions
Use Quizgecko on...
Browser
Browser