Drafting Techniques, ContinuedDrawing aidsSome of the most common drawing aids are protractors, triangles, templates,and french curves.PapersMost drawings today are made directly on tracing papers, cloth, films, orvellum. Drawings on tracing papers are not actually tracings but originaldrawings. Should drawings require extensive revision, you may place thedrawing under a sheet of tracing paper and make the revisions on this second-sheet.When using translucent drawing or drafting mediums, place a sheet of whitepaper or illustration board underneath the drafting paper. The white color ofthe board improves visibility of your lines and the additional support underthe drawing allows you to exert more pressure on the pencil lead to producedense, black lines without excessive scoring of the paper.Ink drawingDrawing or tracing pencil drawings with ink takes precision and caution.You must distinguish between fine variations in line thickness and alsoacquire skill in drawing lines of desired widths. Controlling the thickness ofthe various lines you use for inked drawings requires a trained eye. Youmust also control the pressure of your hand on the pen as you press againstthe paper to prevent undesirable scoring of the paper surface.Most Navy shops use technical reservoir pens. Technical pens come in avariety of line thicknesses. The pens are color coded on the cap or barrel toindicate the thickness of the line the nib produces. Before drawing a line onthe drawing, test the line width on a scrap sheet of paper. Keep a soft clothor tissue nearby to keep clean the pen nib of fiber and debris as you work.In inking technical drawings, you will usually use three line thicknesses. Ingeneral, thick lines define the outline of the object, medium weight linesdetail the object, and fine lines indicate leader lines, dimension lines, andcenterlines.Continued on next page3-8
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