What is projection line in engineering graphics?
Projecting the image of an object to the plane of projection is known as projection. The object may be a point, line, plane, solid, machine component or a building. In engineering drawing practice, two principal planes are used to get the projection of object as shown in figure.
Which projection is used in engineering graphics?
orthographic projection
The standard means of multiview projection in engineering graphics is what we have referred to earlier as the orthographic projection. Although 3-D projections provide a readily identifiable visual image of an object, multiview projections are ideal for showing the details of an object.
What are the possible projection of a line?
Projection Of Lines There are cases of projections of line :- 1. Line Parallel to two Planes and Perpendicular to the third plane. 2. Line Inclined to one Plane and Parallel to another 3.
What is the projection line?
Projection lines are extensions of lines that assist in 2D drawing. For example, in a drawing, you can use projection lines on an auxiliary view to enable creation of additional views with proper alignment and size.
What is projection types of projection?
Projection are defined as mapping of three-dimensional points to a two-dimensional plane. There are two type of projection parallel and perspective. 1. Parallel Projection use to display picture in its true shape and size. When projectors are perpendicular to view plane then is called orthographic projection.
What is Line in engineering drawing?
Lines in technical drawings are part of a specialized graphic language that is standardized throughout industry. Each type of line has a very precise symbolic meaning. Correct usage of this “alphabet of lines” is essential whether you use traditional drafting methods or CAD. Line weight is the thickness of the line.
What is HT and VT in engineering drawing?
HT is always located in the TV. the VP is called vertical trace of the plane. VT is always located in the FV.
What is line in engineering drawing?
What is the use of projection?
What Is the Purpose of Projection? Sigmund Freud believed projection to be a defense mechanism often used as a way to avoid uncomfortable repressed feelings. Feelings that are projected may be controlling, jealous, angry, or sexual in nature.
How to draw a projection of a line?
Point P is 20 mm above H.P. and 30 mm in front of V.P. Point K is behind V.P. Draw to projection of line KP. k k’ p’ X Y p 20 70 60 21. 25 15 Problem 4 : A Line AB, 90 mm long, is inclined to H.P. by 30° and inclined to V.P. by 45º.
What are the different types of projection of points?
1. 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.
How to calculate the projection of line PQ?
An 80mm long line PQ has its end P on the HP and 15mm in front of the VP. The line is inclined at 300 to the HP and its top view is inclined at 600 to the reference line. Draw the projections of line PQ and determine true angle of inclination with the VP.
When to use the first angle of projection?
As per ISO convention the first angle of projection is used. To Define straight line. To Draw the projections of a straight line located at different positions with respect to the VP and the HP.
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