
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 InfoWhy 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.