When to Regrind

Determining how long to use an end mill can sometimes be a difficult question. The following pictures are a guide to help you decide when to pull a tool and send it to Special Tools for reconditioning!

Light Wear on an End Mill

  • Tool still has life left, but can be sharpened if a desired surface finish is needed or tool life was met
  • Minimal amount needed to be taken off of tool to recondition
  • Typical Regrind Loss:
    • .010-.014″ off the diameter of the tool
    • .020″ off the end of the tool

Typical/Desired Wear on an End Mill

  • Tool has used up most of it’s cutting life
  • Can be sharpened without excessive loss of size, flutes are still intact with medium edge wear
  • Typical Regrind Loss:
    • .012-.020″ off the diameter of the tool
    • .020″ off the end of the tool

Excessive/Extreme Wear on an End Mill

  • Tool was used past it’s intended life, causing chipping and breakdown of the carbide
  • Large amount needed to be taken off of tool to recondition
  • Increased cost due to the extreme wear
  • May result in return of a tool, if it is beyond reconditioning
  • Typical Regrind Loss:
    • .020-.050″+ off the diameter of the tool
    • .050+” off the end of the tool, some may even require cutting off extreme wear before sharpening the end

 

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