05 Chptr - 61 5 Sketching Key Terms Arc Chord Destination...

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61 5 Sketching Key Terms Arc Chord Destination point Ellipse Major and minor axes Rhombus Key Concepts Effective sketching involves imagination, good observation skills, knowledge and use of drafting conventions, respect for the hierarchy of lines, a sense of proportion, and speed. Sketches are frequently approximations, and are used to convey ideas quickly; strict adherence to technical drawing standards is not required. Objectives Produce vertical, horizontal, inclined, and curved lines accurately and quickly using freehand drawing techniques. Find the center of a square or rectangle using diagonal lines. Draw circles, arcs, and ellipses using freehand drawing techniques. Divide lines into equal pieces using a simple lined instrument such as a ruler or scale. Draw perpendicular lines on long line segments. Convert pictorial drawings of objects into multiview drawings, and from multiview to pictorial drawings. Format and compose properly proportioned sketches of construction components and assemblies. 62 Introduction The key to formulating and presenting good questions for the design professional and to defining and communicating problems and solutions for oneself, subcontractors, and the skilled labor force that actually does the work is good sketching skill. Preliminary sketches— quickly produced and reproduced in a "thinking with a pencil" process—also help to organize one's thoughts and reduce errors on formal drawings, when such drawings are required. Effective sketching requires clear mental images developed through the eyes or the
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mind's eye. Thoughtful and active observation, imagination, and plenty of exercise using both are therefore essential to developing effective sketching ability. It also helps to remind oneself that the reasons for sketching vary—one may want simply to approximate reality, to suggest an idea, or to produce a preliminary drawing. Properly composed and executed, sketches are every bit as effective as drawings produced with drafting instruments or a computer. Drawing Instruments and Media Sketches can be (and frequently are) produced in the field on pieces of lumber, scrap gyp board, or cardboard using a carpenter's pencil or crayon. Rudimentary in nature, these sketches focus on very basic information and may consist of only a few simple lines. Books and articles featuring noteworthy building projects frequently include the architect's original conceptual sketch, drawn on a napkin or the back of an envelope. For more formal sketches, ordinary papers, such as copy paper or paper bound in tablets, are perfectly adequate. Tablets of grid paper in 4, 5, 8, and 10 squares per inch, corresponding to architect's and engineer's scales, and paper created specifically for isometric drawing, are widely available. Sketchbooks (hard bound blank paper) and daily diaries, which many project managers and
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05 Chptr - 61 5 Sketching Key Terms Arc Chord Destination...

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