Table of contents:
- What are the 3 planes of projection?
- What is first angle projection?
- How many projections are there?
- What are the four standard types of projection?
- What are the two main types of projection?
- What is difference between first and third angle projection?
- Who uses third angle projection?
- Why second and fourth angle projections are not used?
- Why 3rd angle projection is used?
- Which projection is used in India?
- What is VP and HP?
- When a point is above HP and behind VP The point is resting in?
- When a point is above HP and behind VP?
- When the axis of solid is perpendicular to HP?
- When a point is above HP its front view is?
- What is projection line?
- What is another name for orthographic projection?
- What is the use of projection?
- Which line type is thick and black?
- What is the use of thick line?
- Which is the most common tool used for drawing circles?
- What type of sketch shows the front in true shape?
What are the 3 planes of projection?
[FIGURE 3-2] Projections of the point are made onto three of the surfaces that make up the box: the top or "H" (horizontal) plane, the front or "F" (frontal) plane, and the right side or "P" (profile) plane.
What is first 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.
How many projections are there?
This group of map projections can be classified into three types: Gnomonic projection, Stereographic projection and Orthographic projection.
What are the four standard types of projection?
Projection Methods Used In Mechanical Drawing
- Orthographic Projection. Orthographic projection shows a 3D object in two dimensions so that you can see three views: the front view, side view and top view. ...
- Axonometric Projection. Axonometric is another type of orthographic projection. ...
- Oblique Projection. ...
- Perspective Projection.
What are the two main types of projection?
There are two type of projection parallel and perspective.
- Parallel Projection : Parallel projections are used by architects and engineers for creating working drawing of the object, for complete representations require two or more views of an object using different planes. ...
- Perspective Projection :
What is difference between first and third angle projection?
To get the first angle projection, the object is placed in the first quadrant meaning it's placed between the plane of projection and the observer. For the third angle projection, the object is placed below and behind the viewing planes meaning the plane of projection is between the observer and the object.
Who uses third angle projection?
Third angle projection (figure 1.
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.
Why 3rd angle projection is used?
When using third angle projection to compile a diagram of the three views, we first draw the most prevalent side of the object as the front view. The top view is positioned directly above the front view and for the side view, we generally position the right side view on the right of the front view.
Which projection is used in India?
What is VP and HP?
VP: The plane in front of observer is the vertical plane. (VP) or it is also called a Frontal plane. ... HP: The plane which is Horizontal and perpendicular to VP is Horizontal Plane.
When a point is above HP and behind VP The point is resting in?
Answer. Explanation: The position of reference planes will be similar to quadrants in x, y plane co-ordinate system. As the 2nd quadrant lies above the x-axis and behind the y-axis here also the 2nd quadrant is above H.P, behind V.P.
When a point is above HP and behind VP?
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.
When the axis of solid is perpendicular to HP?
Explanation: When the axis of solid is perpendicular to H.P it is indirectly saying that the base is parallel to the horizontal plane so the projection on to it gives true shape of the base and then we can project and find the other dimensions. 4.
When a point is above HP its front view is?
To obtain the front view a', look from the front : Point A is 20 mm above H.P. Aa' is the projector perpendicular to V.P. Hence a' is the front view of the point A and it is 20 mm above the XY line.
What is 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 another name for orthographic projection?
Orthographic projection (sometimes referred to as orthogonal projection, used to be called analemma) is a means of representing three-dimensional objects in two dimensions.
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.
Which line type is thick and black?
Answer. Answer: Object lines and hidden lines.
What is the use of thick line?
Explanation: Thick-thin-thick are used for cutting planes, dashed thick (wide) is used for surface treatment, zigzag lines are used for long-break lines and continuous thin line is used for dimensions, extensions and projection lines.
Which is the most common tool used for drawing circles?
What type of sketch shows the front in true shape?
What is Oblique Sketch? Oblique sketch is an easy and efficient technique of representing an object in pictorial form. Generally, the circles and angles parallel to the plane of projection are considered to be the true size and shape of the object while constructing oblique sketches.
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