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Chapter Summary

  • Sketching is a quick way of visualizing and solving a drawing problem. It is an effective way of communicating with all members of the design team.

  • Three-dimensional figures are bounded by surfaces that are either planar, single-curved, double-curved, or warped.

  • Prisms, pyramids, cylinders, cones, tori, and ellipsoids are common shapes in engineering drawings. There are also five regular polyhedra: the tetrahedron, hexahedron, octahedron, dodecahedron, and icosahedron.

  • There are special techniques for sketching lines, circles, and arcs. These techniques should be practiced so they become second nature.

  • Using a grid makes sketching in proportion an easy task.

  • Circles can be sketched by constructing a square and locating the four tangent points where the circle touches the square.

  • A sketched line does not need to look like a CAD or mechanical line. The main distinction between CAD and instrumental drawing and freehand sketching is the character or technique of the line work.

  • Freehand sketches are made to proportion, but not necessarily to a particular scale.

  • Sketching is one of the most important skills for accurately recording ideas.

  • Isometric, oblique, and perspective are three methods used to create pictorial sketches.

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