Three dimensional objects more effectively communicate concepts. When sketching these objects, there are three fundamental steps: foundation, frame, and finish.
Three Dimensional Objects
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The foundation is a representation of the space that the object occupies. Remember that parallel lines remain parallel, even in space.
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The frame is the outline of the object.
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The finish consists of small details to define texture, depth, and curvature.
The basic principles of line sketching can also be applied to curves. First, establish boundary lines. Next, identify crossing and tangent points. Third, approximate the curve using light strokes before finally darkening the shape.S
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Even as objects become more complex, the same principles are used. Substeps are introduced to reduce the complexity of the individual steps. Here, we demonstrate the construction of a sketch of a milling machine.
While engineering drawings formally represent a finished design, sketches are rough drawings created with simple tools, usually only pencil, which are meant only to communicate concepts.
Sketchinghing
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When drawing a line, begin by choosing endpoints.
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Use light, brisk strokes to approximate the line. Use the inertia of the arm to assist - rotate the page if necessary - and do not over-emphasize finger control.
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Darken the shape.
Click on the forward arrow key to begin instruction.