TAILIEUCHUNG - Manual of Engineering Drawing Manual of Engineering Drawing Second edition P2

Manual of Engineering Drawing Sweeps where a 2D outline is defined graphically and then lofted or swept, by the modeller to give the outline a uniform thickness, as the third dimension. This produces objects of any shape in terms of the x and y | 20 Manual of Engineering Drawing Sweeps where a 2D outline is defined graphically and then lofted or swept by the modeller to give the outline a uniform thickness as the third dimension. This produces objects of any shape in terms of the x and y dimensions but a constant value for the z dimension. Sweeps can model all of those components that look like they are extruded or have been cut from steel plate. For a model of a pipe a circular cross-section is swept or moved along a centreline of any shape. Volumes of revolution for objects the shape of which is symmetrical about a central axis. The wheel is a simple example of this type of 3D object. The input is a half outline or a cross-section through the object which is rotated about the axis by the modeller to produce a 3D illustration. Ruled surfaces is a simple form of modelling where any two sections or profiles can be joined at all points by straight lines. An airfoil or a turbine blade is a typical example where this method can be applied. Examples of various methods of CAD modelling are shown in Fig. . Fig. Pipework systems There are many aspects of pipework draughtsmanship where the computer can considerably improve productivity. In many cases by using 3D modelling software the design can be partly automated. In a typical application a consulting engineer would be appointed to devise an outline solution to a given problem and prepare a specification defining in general terms the scope of the job to be built. The plant system needs to be designed and tenders are invited from organizations with experience in plant construction that would be prepared to erect the project and commission the plant for the client in full working order according to an agreed timetable. On large projects several competitive quotes may be sought from rival construction groups to be delivered by a given date. The client will then make a choice and all responsible parties sign legal contracts. Having received an order to .

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