lines) and the location of the horizontalborderlines are marked off on the vertical trimlines. Dimensions may be scaled along theborderlines.After the drawing is completed, borderlinesare given the required weight. After the completeddrawing has been removed from the board, it iscut to its finished size along the trim line. Ifblueprints are to be made on paper that is notprecut to the standard drawing size, you may findit necessary to leave an extra margin outside thetrim lines. By leaving an extra margin, you candarken the trim lines. The darkened trim lines,when reproduced, will provide a visible line fortrimming the blueprints to size. The extra marginwill also help protect the drawing when it isrepeatedly handled or attached to the drawingboard later for revisions.BASIC FORMATThe following discussion deals with the basicdrafting format. By basic format, we mean thetitle block, revision block, list of materials,and other information that must be placed onapplicable size drafting sheets. Although youmay find slight variations on local-command-prepared drawings, the basic format specifiedin MIL-HDBK-1006/1 is required on all NAV-FACENGCOM drawings.Title BlockThe primary purpose of a drawing title blockis to identify a drawing. Title blocks must beuniform in size and easy to read. They may bemechanically lettered, neatly lettered freehand, orpreprinted commercially on standard size draftingsheets.Generally, the title block is placed in the lowerright-hand corner of the drawing sheet, regardlessof the size of the drawing (except for verticaltitle block). There are three sizes of title blocks:a block used for A-, B-, C-, and G-size drawings(fig. 3-15), a slightly larger block for D-, E-, F-,H-, J-, and K-size drawings (fig. 3-16), and aFigure 3-16.-Preparing title block for D-, E-, F-, H-, J-, and K-size drawings.3-13
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