introduction to orthographic projections
TRANSCRIPT
![Page 1: Introduction to orthographic projections](https://reader030.vdocuments.us/reader030/viewer/2022012313/55cf09b5bb61eb1b628b45ae/html5/thumbnails/1.jpg)
Engineering Drawing
Yash ParikhM.Tech (Computer Integrated Manufacturing)
Assistant Professor
Department of Mechanical Engineering
![Page 2: Introduction to orthographic projections](https://reader030.vdocuments.us/reader030/viewer/2022012313/55cf09b5bb61eb1b628b45ae/html5/thumbnails/2.jpg)
Unit - 02
Orthographic Projections
![Page 3: Introduction to orthographic projections](https://reader030.vdocuments.us/reader030/viewer/2022012313/55cf09b5bb61eb1b628b45ae/html5/thumbnails/3.jpg)
Prof. Yash Parikh SIT Pune
Multiview Drawing
![Page 4: Introduction to orthographic projections](https://reader030.vdocuments.us/reader030/viewer/2022012313/55cf09b5bb61eb1b628b45ae/html5/thumbnails/4.jpg)
4/33
Introduction The purpose of a “Multiview Drawing” is to
represent a three dimensional object on a two dimensional sheet of paper or in a two dimensional drawing space.
Multiview Drawings are used by Engineers, Architects and Contractors to Design and build tiny objects such as microchips or large objects such as buildings, shopping centers, bridges etc.
![Page 5: Introduction to orthographic projections](https://reader030.vdocuments.us/reader030/viewer/2022012313/55cf09b5bb61eb1b628b45ae/html5/thumbnails/5.jpg)
5/33
Example..!!!
![Page 6: Introduction to orthographic projections](https://reader030.vdocuments.us/reader030/viewer/2022012313/55cf09b5bb61eb1b628b45ae/html5/thumbnails/6.jpg)
6/33
Bus is represented by six views, the front, top, sides, back and bottom.
![Page 7: Introduction to orthographic projections](https://reader030.vdocuments.us/reader030/viewer/2022012313/55cf09b5bb61eb1b628b45ae/html5/thumbnails/7.jpg)
7/33
Orthographic Projections Ortho is a Greek word, which means “Perpendicular”.
Orthographic Projections – here the line of sight is perpendicular to the viewer.
By definition, for each element of a orthographic projection drawing you required three dimensions.
Height (H)
Width (W) / Length (L)
Depth (D)
But while drawing, only two of the three dimensions can be shown.
![Page 8: Introduction to orthographic projections](https://reader030.vdocuments.us/reader030/viewer/2022012313/55cf09b5bb61eb1b628b45ae/html5/thumbnails/8.jpg)
8/33
6 Principle Views The 6 principle views are created by looking at the object,
straight on, in the directions indicated.
![Page 9: Introduction to orthographic projections](https://reader030.vdocuments.us/reader030/viewer/2022012313/55cf09b5bb61eb1b628b45ae/html5/thumbnails/9.jpg)
9/33
Orthographic Projection Views
When constructing an orthographic projection, we need to include enough views to completely describe the true shape of the part. Complex part = more views Simple part = less views
The standard views used in an orthographic projection are;
Front view
Top view
Side view (Right or Left Side View)
The remaining 3 views usually don’t add any new information.
Always pick the view which will help in describing the object with highest clarity.
![Page 10: Introduction to orthographic projections](https://reader030.vdocuments.us/reader030/viewer/2022012313/55cf09b5bb61eb1b628b45ae/html5/thumbnails/10.jpg)
10/33
Projection Method Third angle projection is normally used in the US while Europe uses the
First Angle projection. Note the symbols at the bottom of each one will tell you which projection
that you are viewing.
Third-angle Projection
First-angle Projection
![Page 11: Introduction to orthographic projections](https://reader030.vdocuments.us/reader030/viewer/2022012313/55cf09b5bb61eb1b628b45ae/html5/thumbnails/11.jpg)
11/33
Different Views for this????
![Page 12: Introduction to orthographic projections](https://reader030.vdocuments.us/reader030/viewer/2022012313/55cf09b5bb61eb1b628b45ae/html5/thumbnails/12.jpg)
12/33
Each of the view show only 2 out of 3 dimensions (Height, Length, Depth)
![Page 13: Introduction to orthographic projections](https://reader030.vdocuments.us/reader030/viewer/2022012313/55cf09b5bb61eb1b628b45ae/html5/thumbnails/13.jpg)
13/33
Glass Box Approach..!!! Most powerful technique to understand orthographic
projections is a method known as Glass Box Approach.
Here the object is suspended inside the transparent glass box with the help of strings.
After this the views are freeze from each direction,
(each of the six sides of the box).
At the end the box is unfold to get the views.
![Page 14: Introduction to orthographic projections](https://reader030.vdocuments.us/reader030/viewer/2022012313/55cf09b5bb61eb1b628b45ae/html5/thumbnails/14.jpg)
14/33
The object is placed & image is projected on the sides of a box.
![Page 15: Introduction to orthographic projections](https://reader030.vdocuments.us/reader030/viewer/2022012313/55cf09b5bb61eb1b628b45ae/html5/thumbnails/15.jpg)
15/33
The box is unfolded & three views are visible on plane of paper.
![Page 16: Introduction to orthographic projections](https://reader030.vdocuments.us/reader030/viewer/2022012313/55cf09b5bb61eb1b628b45ae/html5/thumbnails/16.jpg)
16/33
![Page 17: Introduction to orthographic projections](https://reader030.vdocuments.us/reader030/viewer/2022012313/55cf09b5bb61eb1b628b45ae/html5/thumbnails/17.jpg)
17/33
View Alignment
The front and top views are aligned vertically and share the same width dimension.
The front and side views are aligned horizontally and share the same height dimension.
![Page 18: Introduction to orthographic projections](https://reader030.vdocuments.us/reader030/viewer/2022012313/55cf09b5bb61eb1b628b45ae/html5/thumbnails/18.jpg)
THANK YOU