Name: Textbook of Engineering Drawing
Author: K Venkata Reddy
Publication: Textbook of Engineering Drawing
Category: Engineering Books
Size: 17.6 MB
Format: E-Book (PDF)
Total Pages: 379
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Summary : Textbook of Engineering Drawing
When a cone is cut by a section plane B-B at an angle, a more than half of the apex angle i.e., e and less than 90°, the curve of the section is an ellipse. Its size depends on the angle a and the distance of the section plane from the apex of the cone. If the angle a is equal to e i.e., when the section plane C-C is parallel to the slant side of the cone.
the curve at the section is a parobola. This is not a closed figure like circle or ellipse. The size of the parabola depends upon the distance of the section plane from the slant side of the cone.
2 Summary : Textbook of Engineering Drawing
A conic section may be defined as the locus of a point moving in a plane such that the ratio of its distance from a fixed point (Focus) and fixed straight line (Directrix) is always a constant. The ratio is called eccentricity. The line passing through the focus and perpendicular to the directrix is the axis of the curve. The point at which the conic section intersects the axis is called the vertex or apex of the curve.
3 Summary : Textbook of Engineering Drawing
As per the optical physics, an object is seen when the light rays called visual rays coming from the object strike the observer’s eye. The size of the image formed in the retina depends on the distance of the observer from the object.
If an imaginary transparent plane is introduced such that the object is in between the observer and the plane, the image obtained on the screen. This is called perspective view of the object. Here, straight lines (rays) are drawn from various points on the contour of the object to meet the transparent plane, thus the object is said to be projected on that plane.
4 Summary: Textbook of Engineering Drawing
Imagine an observer looking at the object from an infinite distance. The rays are parallel to each other and perpendicular to both the front surface of the object and the plane. When the observer is at a finite distance from the object, the rays converge to the eye as in the case of perspective projection. The observer looks from the front surface F or the block, its true shape and size is seen. When the rays or porjectors are extended further they meet the vertical plane(Y.P) located behind the object. By joining the projectors meeting the plane in correct sequence the Front view.
5 Summary: Textbook of Engineering Drawing
VP and H.P are called as Principal planes of projection or reference planes. They are always transparent and at right angles to each other. The projection on VP is designated as Front view and the projection on H.P as Top view. When the planes of projections are extended beyond their line of intersection, they form Four Quadrants. These quadrants are numbered as I, II, ill and IV in clockwise direction when rotated about reference line xy.
PUBLISH ID: LP343EB
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