Definition

• Corner Radius.  A juncture of two plains, ideally at 90°, but with a quarter circular radius instead of a sharp angular corner. Corner radaii are either inside or outside. A principle of metalworking where the tool points – particularly a tracing point or a cutting point in diecutting – cannot reach and form such inside corners. Thus the sides of relief has this slope near the point where it reaches the background (see bevel). This condition does not necessarily exist for hand engraved dies nor for dies made with punches; these have a sharper juncture.

  excerpted with permission from

  An Encyclopedia of Coin and Medal Technology

  For Artists, Makers, Collectors and Curators

  COMPILED AND WRITTEN BY D. WAYNE JOHNSON

  Roger W. Burdette, Editor

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