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3D model showing how to design reliefs for sharp internal corners - Parametric Manufacturing

What A Relief – How to Manage Internal Sharp Corners

Posted On March 28, 2020 By PM Team In Learn DFM /  
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Internal sharp corners are to be avoided when designing for the CNC process. If you want to engineer like a boss, you will never produce a part design with sharp internal corners.

The way to accommodate corners in CNC machining is by adding reliefs. There are 4 methods of managing internal sharp corners. Follow the picture above, the callouts and the list below.

  1. Hole centered in each corner; cheapest solution.
  2. Half-Moon; slightly more expensive than the hole.
  3. Internal Radii; equivalent to half-moon in costs.
  4. Sharp Corner via broaching or Wire/Sinker EDM; most expensive.

Please ensure that you don’t have any internal sharp corners in your designs, as it allows us to provide the lowest prices and shortest lead times possible.

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Learn DFM

  • The 3 Tenets of DFM (Design for Manufacturability)
  • Engineer Like a Boss – Process & CNC Design Guideline
  • How to Design Low Price Machined Parts and Why?
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  • #2 Design Tactic to Lower CNC Production Costs
  • 85% of Costs Happen During Production
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