The picture to the left is an example of an isometric drawing, is a cube and has a top view, a right front view and a left front view. What is an Orthographic drawing? An orthographic drawing show all the sides to an object as an individual, whereas the isometric shows the sides still connected to the shape the orthographic raring shows it off the object so you can see the full views Engineering Drawing Short Questions Essay Words 17 Pages Engineering drawing has its own grammar in the theory of projections, its idioms in conventional practices, punctuations in the types Of lines, its abbreviations, symbols and its descriptions in the constructions. SQ - Name different types of drawing instruments. SQ - Why pencil is rotated in finger while drawing a long line?
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Sections and sectional views Last Updated on Tue, 21 Apr Engineering Drawing A section is used to show the detail of a component, or an assembly, on a particular plane which is known as the cutting plane.
A simple bracket is shown in Fig. Assume that you had a bracket and cut it with a hacksaw along the line marked B-B. If you looked in the direction of the arrows then the end view B-B in the solution Fig.
Alternatively had we cut along the line C-C then the plan in the solution would be the result. A rather special case exists along the plane A-A where in fact the thin web at this point has been sliced.
Now if we were to cross hatch all the surface we had cut through on this plane we would give a false impression of solidity. To provide a more realistic drawing the web is defined by a full line and the base and perpendicular parts only have been cross hatched. Note, that cross hatching is never undertaken between dotted lines, hence the full line between the web and the remainder of the detail.
However, the boundary at this point is theoretically a dotted line since the casting is formed in one piece and no join exists here.
This standard drawing convention is frequently tested on examination papers. Cutting planes are indicated on the drawing by a long chain line 0. The cutting plane is lettered and the arrows indicate the direction of viewing. The sectional view or plan must then be stated to be A-A, or other letters appropriate to the cutting plane.
If the original drawing is to be microfilmed successive lines should not be closer than 4 mm as hatching lines tend to merge with much reduced scales. When hatching very small areas the minimum distance between lines should not be less than 1 mm. In the case of very large areas, cross hatching may be limited to a zone which follows the contour of the hatched area. On some component detail drawings it may be necessary to add dimensions to a sectional drawing and the practice is to interrupt the cross hatching so that the letters and numbers are clearly visible.
Sections and Section views on Engineering Drawings
Sectioning or crosshatching lines Last Updated on Thu, 16 Apr Engineering Drawing When you go to a museum, you often see artefacts that have been cut up. For example, to illustrate how a petrol engine works, the cylinder block can be cut in half and the cut faces are invariably painted red. In engineering drawing , cross-hatching is the equivalent of painting something red. It is used to show the internal details of parts which otherwise would become too complex to show or dimension. An example of staggered cross-hatching is shown in the inverted plan drawing of the movable jaw in Figure 3. If large areas are to be sectioned, there is no particular need to have the cross-hatching lines covering the whole of the component but rather the outside regions and those regions which contain details. When sections are taken of long parts such as ribs, webs, spokes of wheels and the like, it is normally the convention to leave them unsectioned and therefore no cross-hatch lines are used.
Engineering Drawing – Dimensioning and Sectioning Essay
A Section or cross section is a view generated from a part or assembly on a cutting plane or multiple cutting planes that reveals the outlines on the inside or assembly fits. Sections normally comprise of two parts, firstly the Section Cut indicator with identification. This indicator will then generate a Section view. Section Cut indicators Section cut indicators identifies the plane where, how and on which planes the section cut is made.