B

Dimension. Projection, Sections and Leader Lines 0.3mm

C ---Hidden Detail 0.3mm

Centre Lines and Locus of Moving Parts

(j — V . . - / Short Break Lines or Inepilar Boundaries

Fig.5 Types of lines for use on engineering drawings with it in more detail later in the book. Current practice here is to use a thin line with thick ends for this purpose (Fig.6) but the full thick line should be used if there is risk of any confusion. (F) seldom arises in

Fig.6 Alternative method for indicating cutting planes. See text.

run-of-the-mill drawing, but when used it is important that the length of the dashes should be markedly less than those used for centrelines, (D), (G) and (H) are used to indicate that the whole of the object has not been drawn. In the case of long, round shafts the convention shown in Fig. 7 is used when details of the two ends are drawn but the centre part is not drawn. Fig. 8 is a drawing of a 'something' showing the application of the various types of line.

An important rule. Where centrelines cross they should always intersect on part

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