Machine drawing; a practical guide to the standard methods of graphical representation of machines, including complete detail drawings of a duplex pump and of a direct-current generator . ute uniformity in the making ofthe lines, but in choosing certain characteristic lines to convey differ-ent ideas. The most common kinds of lines used are shown in Fig. 1and described below, and the purposes of their use are stated. Full Lines. Full lines represent the portions of the objectwhich are visible; they should be bold and clear, heavy on detaildrawings, say ^ wide, and lighter on an assembled drawi
Machine drawing; a practical guide to the standard methods of graphical representation of machines, including complete detail drawings of a duplex pump and of a direct-current generator . ute uniformity in the making ofthe lines, but in choosing certain characteristic lines to convey differ-ent ideas. The most common kinds of lines used are shown in Fig. 1and described below, and the purposes of their use are stated. Full Lines. Full lines represent the portions of the objectwhich are visible; they should be bold and clear, heavy on detaildrawings, say ^ wide, and lighter on an assembled drawing. Invisible Lines. Invisible lines represent the hidden parts ofthe object; they consist of short dashes regularly spaced, the spaces MACHINE DRAWING 3 being about J the length of the dash; the dashes should never havea greater width than that of the full line, and usually should beslightly less. A drawing is much easier to read if the full lines forcethemselves on the eye, while the dotted lines, by their lighter char-acter, are left in the background. Center or Axis Lines. Center or axis lines consist of alternatelong and short dashes, finer than the main lines of the Fig. 2. Flanged Coupling Giving Practical Application of Fig. 1 Some draftsmen prefer not to use dash and dot center lines, butmake them continuous fine lines. Either style is good. Dimension and Extension Lines. Dimension and extensionlines are made fine, like center lines, and may be either full or dotted,according to the preference of the draftsman; the full line is prefer-able on account of its bolder character and the shorter time it takesto make it. Extension lines start a short distance away from the edges ofthe object, so as to break up the continuity of the lines of the objectand the extension line. Dimension lines are run between the extension lines, terminatingat the extension lines in arrows. The extension lines should alwaysrun a short distance beyond the point at which the dimension lin
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Keywords: ., bookcentury1900, bookdecade1910, bookpublis, booksubjectmachinery
