About Drafting Aids
In engineering, drafting aids refer to drafting tools or equipment that may be used to measure and layout drawings, as well as to increase the uniformity and speed with which standard drawing pieces are created, For example, pencil, t-squares, drafting boards, French curves, drafting paper, etc.
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The Use of Drafting Tools
Drafting tools may be used to increase the uniformity and efficiency of creating standard drawing elements, as well as to measure and arrange drawings. The drawing medium is marked by tools such as pens and pencils. Other tools, such as straight edges, let the operator make straight lines or draw complex designs repeatedly. The lengths of lines and angles are measured using various scales and the protractor, allowing for precise scale drawing. Arcs and circles are drawn with a compass. The drawing material was held in place by a drawing board; later boards contained drafting tools that sped up the arrangement of straight lines and angles. The drafting of repeating components like circles, ellipses, schematic symbols, and text was made easier with the use of templates and lettering guidelines.
Different Kinds of Drafting Tools
Pencils
Pencils and technical pens are the most common and traditional style for technical drawing. Mechanical pencils with a uniform lead thickness are commonly used. 0.35 mm, 0.5 mm, 0.7 mm, and 1.0 mm are the most common line widths. The hardness ranges from HB to 2H in most cases. The contrast is greater with softer lead, but the line is more accurate with harsher lead. When photocopying, a lack of contrast in the lead line is a concern, although modern scanning copy processes have enhanced the final output. Different lead kinds are required for different surfaces, such as paper or plastic.