GD&T Basics

GD&T Basics Online Training

Course Outline
Course Objectives

Intended Audience

Front-line operators and quality professionals who use engineering drawings and blueprints.

Time To Complete

2 hours (0.2 CEUs)

Print Course Info

Why is GD&T Training Needed?

Precision parts require precision measurements and that starts with knowing how to read blueprints and engineering drawings so that the proper measurements can be taken.

GD&T Basics Online Training

In this course, learners will be introduced to key terms used in metrology and GD&T and how to read and interpret basic engineering drawing and GD&T symbols.

This Training Enables Learners To…

  • Define key metrology terms.
  • Read and interpret basic engineering drawing symbols.
  • Understand GD&T terminology and symbols.

Recommended Prerequisites

  • Basic math skills.

You May Also Be Interested In…

  • Measurement Systems Analysis – Comprehensive training in how to statistically measure the accuracy and reliability of measurement systems.
  • Gage Training – Focused on how to use precision hand gages to measure parts against blueprint specifications.

Gage Training Course Outline

Unit 1 – Gage Primer

Lesson 1 – Why Measure?

  • Understand the three main reasons why parts are measured.
  • Explain the five critical aspects of measuring.

Lesson 2 – Language of Measurement

  • Use the language of dimensional measurement.
  • Convert English to SI (metric) units of measure and SI to English units.
  • Understand basic terminology used on drawings and blueprint.

Lesson 3 – Measurement Standards

  • Explain the role of standards in the dimensional measurement field.
  • Follow the traceability trail of calibration standards.

Lesson 4 – Precision and Accuracy

  • Explain common sources of measurement error.
  • Understand the impact of the five categories of measurement error: accuracy, repeatability, reproducibility, stability, and linearity.

Lesson 5 – Datums

  • Use a datum to locate the position of part features.
  • Identify datum planes, datum points, and datum axis.

Lesson 6 – Introduction to GD&T

  • Explain the differences between coordinate tolerancing and geometric dimensioning and tolerancing.
  • Interpret feature control frames.
  • Use the 14 geometric characteristic controls.
  • Identify GD&T modifying symbols.

Lesson 7 – Surface Finishes

  • Characterize the finish of a surface.
  • Identify the five most common types of surface deviations.
  • Use surface symbols to communicate machining instructions.

Lesson 8 – Math for Measuring

  • Add and subtract fractions.
  • Convert fractions to decimals.
  • Calculate the perimeter and area of rectangular shapes and the circumference and area of circular shapes.

Unit Test Challenge

  • An assessment of the learner’s progress in this unit.

Unit 2 – Using Gages

Lesson 1 – Types of Gages

  • Explain the differences between direct and transfer measurement gages.
  • Identify the line of measurement.
  • Apply the 10-times rule of measurement.

Lesson 2 – Calipers

  • Use a vernier scale.
  • Use a caliper to take measurements.
  • Explain the pros and cons of vernier, dial, and digital calipers.

Lesson 3 – Micrometers

  • Use a micrometer to take measurements.
  • Read precision micrometer scales.
  • Identify applications for inside and outside micrometers.

Lesson 4 – Height and Depth Gages

  • Use height gages with a surface plate to take direct or comparative measurements.
  • Identify height gage accessories used for specialty measuring applications.
  • Use depth gages to measure the depth of features.

Lesson 5 – Fixed Gages

  • Explain the pros and cons of fixed and variable gages.
  • Identify measurement applications for fixed gages.

Lesson 6 – Test Indicators and Dial Indicators

  • Use both test indicators and dial/digital indicator for comparative length measurements.
  • Select indicator contact points types and test stands to specific measurement applications.

Lesson 7 – Gage Blocks and Surface Plates

  • Wring and stack gage blocks.
  • Use gage blocks to calibrate variable gages, check the validity of fixed limit ages, and to set comparative-length indicators.
  • Use gage blocks with surface plates to make comparative measurements.

Unit Test Challenge

  • An assessment of the learner’s progress in this unit.

Unit 3 – Gaging Applications

Lesson 1 – Application Overview

  • Understand that some dimensional instruments are appropriate and some are not for a specific measuring application.
  • Realize that there are common errors and misapplications in measuring and that they can be avoided.

Lesson 2 – Linear Measurements

  • Select the appropriate type of gages for common linear measurement applications.
  • Measure the position of a hole.
  • Measure the differential height between two lands.

Lesson 3 – Roundness and Circularity

  • Use two-point contact gages to measure out-of-roundness.
  • Recognize limitations of two-point contact gages for shapes that are oval, egg-shaped, irregular or lobed.
  • Be exposed to three-point contact gages and sophisticated gages to measure out-of-roundness.

Lesson 4 – Common Misapplications

  • 12 common measuring mistakes and misapplications.
  • What to look out for and how to prevent these mistakes from happening.

Lesson 5 – Measuring Complications

  • 10 systemic problems that can lead to measuring complications.
  • An exploration of why each complication may occur with suggested remedies to combat the complication and make the system more robust.

Lesson 6 – Care of Gages

  • Apply universal practices to take care of gages.
  • Review tips for cleaning and caring for specific instruments.

Unit Test Challenge

  • An assessment of the learner’s progress in this unit.

Gage Training Course Objectives

Unit 1 | Gage Primer

The purpose of this unit is to develop a fundamental understanding of basic gaging concepts. The rest of the training program builds on these concepts. Upon completion of this unit you will be able to:

  • Describe the purpose of measuring and the importance of precise and accurate measurements.
  • Define key metrology terms.
  • Explain the source of measurement standards and why they are so important.
  • Read and interpret basic engineering drawing symbols.
  • Understand GD&T terminology and symbols.
  • Identify and classify flaws in the finish of a surface.
  • Use basic geometry to describe part dimensions.

Unit 2 | Using Gages

In this unit you will learn the proper way to use a variety of dimensional measurement instruments. Upon completion of this unit you will be able to:

  • Use calipers, vernier calipers, micrometers, and vernier micrometers and interpret readings taken with those instruments.
  • Measure parts with both height and depth gages.
  • Use fixed limit gages and describe the advantages and disadvantages of them.
  • Perform measurements with comparative length devices such as test indicators and dial indicators.
  • Use gage blocks for establishing dimensional standards as well as describe their qualities and grades.
  • Explain the purpose and qualities of surface plates.

Unit 3 | Gaging Applications

In this unit you will learn how to select the best gage to use for particular measuring situations. Upon completion of this unit you will be able to:

  • Specify the best gage to use for a variety of different measuring applications.
  • Identify the best way to measure linearity, roundness, and circularity.
  • Make sure you don’t make any of the most common measuring mistakes.
  • Design a measurement process that eliminates or reduces potential measuring complications.
  • Properly care for and maintain gages and measuring instruments.

GD&T Basics Online Training Course Outline

Lesson 1 – Language of Measurement

  • Use the language of dimensional measurement.
  • Convert English to SI (metric) units of measure and SI to English units.
  • Understand basic terminology used on drawings and blueprints.

Lesson 2 – Datums

  • Use a datum to locate the position of part features.
  • Identify datum planes, datum points, and datum axis.

Lesson 3 – Introduction to GD&T

  • Explain the differences between coordinate tolerancing and geometric dimensioning and tolerancing.
  • Interpret feature control frames.
  • Use the 14 geometric characteristic controls.
  • Identify GD&T modifying symbols

Unit Test Challenge

  • An assessment of the learner’s progress in this unit.

GD&T Basics Training Course Objectives

  • Define key metrology terms.
  • Read and interpret basic engineering drawing symbols.
  • Understand GD&T terminology and symbols.
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