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Sharp Internal Corners

Sharp inside corners cannot be achieved with traditional milling and require nontraditional machining processes such as electrical discharge machining (EDM).

Recommendations:
  • When designing a three-edge inside corner, one of the inside edges must have the radius of the end mill. A generous corner radius can accommodate a larger milling cutter, which is preferred. Use the radii recommended by fabrication personnel to ensure that tools are easily obtained and maintained.
  • If sharp corners cannot be avoided, drill a separate relief hole to allow a male ninety-degree corner to fit. Drill the hole first because drills cannot withstand significant side loading.



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