Exam 37: Sketching Fillets, Radii, Rounded Corners, Edges, and Shading

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Wherever practical, sharp corners are rounded and sharp edges are eliminated. This is true of fabricated and hardened parts where a sharp corner reduces the strength of the object. It is also true of castings where sharp edges and corners may be difficult to produce.

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STEP 1 Sketch the lines that represent the edge or corner.
STEP 2 Draw the arc to the required radius.
STEP 3 Draw two lines parallel to the edge line from the two points where the arc touches the straight lines.
STEP 4 Sketch a series of curved lines across the work with the same arc as the object line. These curved lines start at one of the parallel lines and terminate at the other end.