We’re covering the topic of “projection planes,” one of the subjects in technical drawing and descriptive geometry. In this article, we’ll take a look at projection planes. What is the epure (unfolded view)? What are the fold line and the axis? What are the steps of view extraction?
Projection Planes
The basic projection planes are considered perpendicular to each other in space. There are 3 planes:
- Horizontal plane (top view): The plane parallel to the ground.
- Frontal plane (front view): The plane perpendicular to the horizontal plane.
- Profile plane (side view): The plane perpendicular to both the frontal and horizontal planes.
Dihedral Angle and the Epure
The closed (3D, glass-box) form of the projection planes is called the dihedral (or trihedral) angle.
Epure: The unfolded, flattened form of the projection planes is called the epure. We’ll use the epure layout in our drawings.
Showing the Three Views on the Epure Plane
The figure shows the 3 views of a matchbox shown on the epure plane.
Pay attention to the thin lines between the views.
In this article, we covered “projection planes,” one of the topics in technical drawing and descriptive geometry. We looked at projection planes, what the epure is, and what the fold line and axis are, and gave various projection examples. See you in new articles.
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