Difference between first angle and third angle projection.

Question

Accepted Answer

First angle and third angle projection are two different methods used in technical drawing to represent 3D objects on a 2D surface.

First angle projection is commonly used in Europe and Asia, while third angle projection is commonly used in North America.
In first angle projection, the object is placed in the first quadrant and the views are projected onto the planes of projection from the object's opposite side.
In third angle projection, the object is placed in the third quadrant and the views are projected onto the planes of projection from the object's same side.
First angle projection is often considered more intuitive as it mimics the way we naturally view objects, while third angle projection requires mentally flipping the object.
Both methods have their advantages and disadvantages, and the choice between them depends on regional standards and personal preferences.

Accepted Answer

The object is placed in the first quadrant.

The object is placed in the third quadrant.

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