Quick Answer: What Is 1st And 3rd Angle Projection?

Who uses 1st angle projection?

Orthographic Representation Third angle projection (figure 1.2) is used mainly in The United States and Canada whilst first angle projection (figure 1.1) is used mainly throughout Europe and the rest of the world..

What are the 3 main views of an orthographic drawing?

Typically, an orthographic projection drawing consists of three different views: a front view, a top view, and a side view. Occasionally, more views are used for clarity. The side view is usually the right side, but if the left side is used, it is noted in the drawing.

What’s a orthographic projection?

Orthographic projection, common method of representing three-dimensional objects, usually by three two-dimensional drawings in each of which the object is viewed along parallel lines that are perpendicular to the plane of the drawing. …

Why do we use 1st and 3rd angle projection?

Europe had used the method of first angle projection in creating orthographic views of three-dimensional parts for manufacturing for many decades, while in the U.S., engineers had settled on using third angle projection with its more logical placement of views.

Does the UK use first or third angle projection?

The Third Angle Projection or First Angle Projection, different countries and regions typically use one method or the other although this can depend on a company’s customer. Since World War 2 where the UK sent engineering drawing to the US for manufacture the UK has adopted 3rd Angle projection as the general standard.

How do you read 1st and 3rd angle drawings?

For the first angle projection, place the object in the first quadrant and in the third quadrant for the third angle projection. The object is placed between the plane of projection and observer for the first angle projection and between the object and observer for the third angle projection.

How is a third angle projection indicated on a drawing?

1.5 Third Angle Projection In third angle projection, each view of the object is projected opposite to the direction (sense) of sight of the object, onto the interior walls of the box. A two dimensional representation of the object is then created by “unfolding” the box, to view all the interior walls.

What are the 6 principal views of an object?

What are the six principal views of an object? Front, top, right side, left side, rear, and bottom.

What are the standard views used in a 3rd angle projection?

Third angle projection is one of the methods of orthographic projection used in technical drawing and normally comprises the three views (perspectives): front, top and side.

Why second and fourth angle projections are not used?

Overlapping projection views create confusion in the drawing. Therefore the 2nd angle projection system is not used to draw engineering drawings. Similarly when the object is placed in the 4th quadrant both top and front view will overlap. Therefore fourth angle projection is also not used.

When a point is above HP and behind VP it is in?

Projection of Points • There are basically nine type of projections of point is space : 1. In FIRST Quadrant (Above H.P. , In front of V.P.) 2. In SECOND Quadrant (Above H.P. , Behind V.P.) 3. In THIRD Quadrant (Below H.P. , Behind V.P.) 4.

What is 1st angle projection?

First angle projection is a method of creating a 2D drawing of a 3D object. It is mainly used in Europe and Asia and has not been officially used in Australia for many years. In Australia, third angle projection is the preferred method of orthographic projection. Note the symbol for first angle orthographic projection.

What is 3rd angle orthographic projection?

First and third angle projections The difference between first and third angle projection is in the position of the plan, front and side views. In third angle, what you see from the right would be drawn on the right. In first angle, the view from the right would be projected through and drawn on the left.

What is the third angle projection symbol?

In third-angle projection, the front view is pulled forward to the front wall, and the right side view is pulled to the right wall, so the third-angle symbol shows the trapezoid with its shortest side towards the circles.

What are the 3 planes of orthographic projection?

These include the Frontal Plane, Profile Plane, and Horizontal Plane: In addition to this, if a plane is placed at any other place, then it is called Auxiliary Plane. These are used to draw inclined surfaces of an object.

How do you make a third angle symbol in solidworks?

Open a drawing. Click Note (Annotation toolbar) or Insert > Annotations > Note. In the PropertyManager, under Text Format, click Add Symbol ….In the Symbol dialog box:Locate the category you used.Hover over the 3 rd angle projection symbol.Select the symbol and click OK.