This is a free course on Geometric dimensioning and tolerance. The course lessons are delivered with the help of interactive videos. Large attention is given to develop the content of this course in such a way that the participant would be taught each and every topic of the course with the help of pictures, animations and videos and not just with the help of textual content. All the concepts are explained with the help of simple exercises or examples. In future, we will be extending our course lessons to cover GD & T in CAD software as well.
The course is delivered using videos lessons. The length of video varies from 20 minutes to 40 minutes. Each video lesson introduces you to one single topic of GD & T. In all we will be covering five topics which are mentioned in the course syllabus. Considering the number of modules covered in all the video lessons and required practice that you need to do, it is expected to finish this course in 4 weeks.
The course is divided into five lessons. Each lesson has a specific objective and is designed to satisfy the needs of subsequent lesson. It is recommended that you do not move to the next lesson until all the concepts in the lesson are well understood.
Lesson 1: Engineering Drawing
This Lesson consists of the following topics
- Components of drawing sheets
- Orthographic projection
This lesson takes you through a virtual tour of the engineering subject of Mechanical drawing. It will refresh your prior concepts of engineering drawing like orthographic projection, sheet nomenclatures etc.
The second half of the lesson discusses about the various dimensioning symbols and their use as well as proper way to dimension a drawing in terms of spacing and readability. These concepts are taught with the help of exercises.
Lesson 2: Geometric Tolerance
This lesson gives you a proper idea of all the various aspects of tolerance. This lesson covers the following topics of tolerance
- Overview and definition
- Various functions of tolerance
- Ways of specifying tolerance
- Types of tolerances
- Tolerance of form and orientation
- Consideration of factors while choosing tolerance and its effect on costing
Lesson 3: Limits and Fits
In this lesson, you will be introduced to the concept of Limits and Fits. This concept comes into picture due to the fact that it is very difficult to produce any manufactured object exact to its dimensions mentioned in the drawing sheet.
Following are the topics covered in this lesson
- Introduction and terminology
- Understanding the difference between allowance and tolerance
- Various types of Fits
- Choosing and displaying system for Limits and Fits
Lesson 4: Surface Finish in GD & T
In this lesson, we will be first revising the theoretical explanation of surface finish and the factors affecting its roughness. You will also be learning the surface finish techniques and its measurement methods.
Later on in this course, we will study the various roughness parameters with their definitions, ways to indicate surface roughness in drawing sheets with examples.
Lesson 5: Welding Symbols in GD & T
Here we will be revising the basic concepts of welding, such as – processes, terminologies and joints. Later we will study the basic set of weld related symbols in GD & T and then focus on how they are represented on an industry level design/drawing sheet.