EF101 Analysis & Skills Module 1.3 Engineering Graphics Terminology and Conventions.
-
Upload
abraham-quinn -
Category
Documents
-
view
218 -
download
2
Transcript of EF101 Analysis & Skills Module 1.3 Engineering Graphics Terminology and Conventions.
![Page 1: EF101 Analysis & Skills Module 1.3 Engineering Graphics Terminology and Conventions.](https://reader035.fdocuments.in/reader035/viewer/2022062519/5697bfee1a28abf838cb9a3d/html5/thumbnails/1.jpg)
EF101 Analysis & SkillsModule 1.3
Engineering GraphicsTerminology and Conventions
![Page 2: EF101 Analysis & Skills Module 1.3 Engineering Graphics Terminology and Conventions.](https://reader035.fdocuments.in/reader035/viewer/2022062519/5697bfee1a28abf838cb9a3d/html5/thumbnails/2.jpg)
Reading Review
• Why are multi-view orthographic projections used?
• What is a disadvantage of multi-view orthographic projections?
• Which type of multi-view projection is used in the United States?
• Name the components that are typically part of a set of working drawings?
![Page 3: EF101 Analysis & Skills Module 1.3 Engineering Graphics Terminology and Conventions.](https://reader035.fdocuments.in/reader035/viewer/2022062519/5697bfee1a28abf838cb9a3d/html5/thumbnails/3.jpg)
Reading Review
• What are construction lines?• What are two types of pictorial sketches
commonly used in freehand sketching?• Which type of 3D projection places the
principal face of an object parallel to the plane of the paper?
• What type of projection results in multiple views?
![Page 4: EF101 Analysis & Skills Module 1.3 Engineering Graphics Terminology and Conventions.](https://reader035.fdocuments.in/reader035/viewer/2022062519/5697bfee1a28abf838cb9a3d/html5/thumbnails/4.jpg)
Design Process / Working Drawings
![Page 5: EF101 Analysis & Skills Module 1.3 Engineering Graphics Terminology and Conventions.](https://reader035.fdocuments.in/reader035/viewer/2022062519/5697bfee1a28abf838cb9a3d/html5/thumbnails/5.jpg)
Sketch Types
![Page 6: EF101 Analysis & Skills Module 1.3 Engineering Graphics Terminology and Conventions.](https://reader035.fdocuments.in/reader035/viewer/2022062519/5697bfee1a28abf838cb9a3d/html5/thumbnails/6.jpg)
Glass Box
![Page 7: EF101 Analysis & Skills Module 1.3 Engineering Graphics Terminology and Conventions.](https://reader035.fdocuments.in/reader035/viewer/2022062519/5697bfee1a28abf838cb9a3d/html5/thumbnails/7.jpg)
Unfolding Glass Box
![Page 8: EF101 Analysis & Skills Module 1.3 Engineering Graphics Terminology and Conventions.](https://reader035.fdocuments.in/reader035/viewer/2022062519/5697bfee1a28abf838cb9a3d/html5/thumbnails/8.jpg)
View Relationships
![Page 9: EF101 Analysis & Skills Module 1.3 Engineering Graphics Terminology and Conventions.](https://reader035.fdocuments.in/reader035/viewer/2022062519/5697bfee1a28abf838cb9a3d/html5/thumbnails/9.jpg)
• Controls the placement of views• Depicted on drawings by the truncated cone symbol• Third Angle
• United States and Great Britain• Top view - above front view.• Right side - right of front view• Same as “Glass box” unfolding
• First Angle• Rest of world• Top view - below front view.• Right side - left of front view
• We will only use third-angle projections in EF101
Projection Types
![Page 10: EF101 Analysis & Skills Module 1.3 Engineering Graphics Terminology and Conventions.](https://reader035.fdocuments.in/reader035/viewer/2022062519/5697bfee1a28abf838cb9a3d/html5/thumbnails/10.jpg)
What can a Line Represent?
![Page 11: EF101 Analysis & Skills Module 1.3 Engineering Graphics Terminology and Conventions.](https://reader035.fdocuments.in/reader035/viewer/2022062519/5697bfee1a28abf838cb9a3d/html5/thumbnails/11.jpg)
• Parallel – appear true size in one view,and as an edge (line) in other views
• Inclined – appear distorted in two views, and as an edge in the view perpendicular to the surface
• Oblique – appear distorted in all three views
Orthographic ProjectionSurface Types
![Page 12: EF101 Analysis & Skills Module 1.3 Engineering Graphics Terminology and Conventions.](https://reader035.fdocuments.in/reader035/viewer/2022062519/5697bfee1a28abf838cb9a3d/html5/thumbnails/12.jpg)
Hidden Lines
• Dashed lines, lighter (thinner) than object lines.
• Used in orthographic projection views to represent edges that are “hidden” from the line of sight for a view.
• Not used in isometric or oblique views.
![Page 13: EF101 Analysis & Skills Module 1.3 Engineering Graphics Terminology and Conventions.](https://reader035.fdocuments.in/reader035/viewer/2022062519/5697bfee1a28abf838cb9a3d/html5/thumbnails/13.jpg)
Hidden Lines Example
![Page 14: EF101 Analysis & Skills Module 1.3 Engineering Graphics Terminology and Conventions.](https://reader035.fdocuments.in/reader035/viewer/2022062519/5697bfee1a28abf838cb9a3d/html5/thumbnails/14.jpg)
CenterlinesLocate the center of circles and the axis of cylindrical features.
![Page 15: EF101 Analysis & Skills Module 1.3 Engineering Graphics Terminology and Conventions.](https://reader035.fdocuments.in/reader035/viewer/2022062519/5697bfee1a28abf838cb9a3d/html5/thumbnails/15.jpg)
1. Object linesdark and thick
2. Hidden linesdark, dashed and thin
3. Centerlinesdark, “long–short–long”, thin
4. Construction linesvery thin and light
Line Types and Precedence
![Page 16: EF101 Analysis & Skills Module 1.3 Engineering Graphics Terminology and Conventions.](https://reader035.fdocuments.in/reader035/viewer/2022062519/5697bfee1a28abf838cb9a3d/html5/thumbnails/16.jpg)
Coordinate System Placement
• Placement of a coordinate system is arbitrary, but once placed you must be consistent in its use.
• AutoCAD’s convention is that the XY plane of the coordinate system represents the view it calls the top view.
• We place a coordinate system on sketches to help us to get used to working with a consistent coordinate system.
![Page 17: EF101 Analysis & Skills Module 1.3 Engineering Graphics Terminology and Conventions.](https://reader035.fdocuments.in/reader035/viewer/2022062519/5697bfee1a28abf838cb9a3d/html5/thumbnails/17.jpg)
Multi-view sketching
• Determine necessary views
• Plan layout, spacing, scale to fit paper
• Develop drawing: block in views, make sure width, height, depth are correct in all views
• Add features in each view.
• Check work
![Page 18: EF101 Analysis & Skills Module 1.3 Engineering Graphics Terminology and Conventions.](https://reader035.fdocuments.in/reader035/viewer/2022062519/5697bfee1a28abf838cb9a3d/html5/thumbnails/18.jpg)
Sketch as an Orthographic
Projection
![Page 19: EF101 Analysis & Skills Module 1.3 Engineering Graphics Terminology and Conventions.](https://reader035.fdocuments.in/reader035/viewer/2022062519/5697bfee1a28abf838cb9a3d/html5/thumbnails/19.jpg)
Isometric sketching
• Use paper in landscape mode• Determine orientation• Determine scale and location to fit object in the
center of the page• Sketch the bounding box• Work from faces and corners• Parallel lines are parallel.• “Connect the dots” i.e. connect known locations.
![Page 20: EF101 Analysis & Skills Module 1.3 Engineering Graphics Terminology and Conventions.](https://reader035.fdocuments.in/reader035/viewer/2022062519/5697bfee1a28abf838cb9a3d/html5/thumbnails/20.jpg)
Sketch as an Isometric Projection