Engineering Drawing from First Principles. Using Auto: Cad by Dennis E. Maguire

By Dennis E. Maguire

Engineering Drawing From First ideas is a advisor to reliable draughting for college kids of engineering who have to methods to produce technically actual and distinctive designs to British and foreign criteria. Written via Dennis Maguire, an skilled writer and town and Guilds leader examiner, this article is designed to be used on additional schooling and collage classes the place a easy knowing of Read more...

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The command line changes to Select obj ects: Other corner: 35 found Base point Choose the centre of the circular boss and the command line reads / Reference:. 5 and press and the required reduction will appear. Take a second copy of the blade on another part of the drawing sheet and use the ARRAY feature as before to draw a twin propeller, then a three-bladed propeller (Fig. 13). Note that if you draw a component half size, then all aspects of the construction are reduced in 37 « o CO ,....

7 Plane handle The plane handle in Fig. 9 is another problem involving establishing the position of arc centres and tangency points. Start by inserting construction lines to locate the centres of the two R18 arcs. Clean up unwanted lines after positioning tangency points and modify the outline into polylines. Earthenware vase The dimensions of a vase are given in Fig. 10. Copy the profile and add the dimensions. Start by drawing the R50 radius and construct the intersecting arcs to locate the centres for the other two radii.

Enter 2. The command line replies Uni t cell or dis tance between rows (- - -) :. Enter 20. The command line replies Dis tance between col umns (111) :. Enter 30 and the arrangement is drawn. Ellipse One of the features of CAD which is valuable to the draughtsman is its ability to draw ellipses. An ellipse has two axes, known as the major and minor axes, and two focal points. 15 An ellipse can be drawn if you are given the dimensions of the two axes. The focal points are found by drawing an arc from one end of the minor axis which cuts the major axis at two points Fl and F2 (Fig.

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