INCLINED SURFACES
This is similar in format to the lesson on normal surfaces but because an inclined surface is a bit more than parallel or perpendicular to one another, I have included a few video clips via YouTube to help our understanding.Follow this link to Inclined Surfaces in Orthographic Projection
Very few mechanical components are consist of only normal surfaces (flat, parallel and perpendicular only). We will continue to develop the visualization process of 3 dimensional solids with an introduction to inclined surfaces. Recall our definition of the three principal projection planes: frontal, horizontal, and profile. Which we know as FRONT, TOP AND RIGHT. An inclined surface is a surface that is perpendicular (OR AT A 90 DEGREE ANGLE) to one of the principal planes, and is at some angle to the remaining two principal planes.
As such, an inclined surface will always appear as a line in one of the principal views and as a foreshortened area in the other two views.
An inclined surface will NOT appear true size in a principal view. Following are a few examples of simple inclined surfaces and edges and how they appear in isometric and orthographic views.
Now before we continue - I want us to be certain that we know the difference between ISOMETRIC and ORTHOGRAPHIC views.
The image below left is an isometric view while the image below right is an orthographic view.
Look at the following video clips to help with your understanding of this concept of inclined surfaces.
YouTube video Inclined surface example 1
YouTube video Inclined surface example 2
The following video clip is an explanation of the figure shown below. While listening to the explanation visualize each of the greyed out areas as sheets of paper - while visualizing the lines shown with each grey area as the EDGES of that sheet viewed from the two directions that are perpendicular to direction which shows you the grey area.
Orthographic Reading of normal and inclined plane surfaces
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