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Determining when a tool has reached the point when it’s time to re-sharpen takes a visual examination of the cutting edge. Inspecting the cutting edge will determine if the running parameters are adequate for optimal results.

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This drawing is an example of when it’s time to re-grind a tool. Pay close attention to the margin, smearing, or a need to be cleaned-up during the re-grind process to ensure the tools’ repeatability.

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If the outside corner is rounded, it usually means that the SFM is too high and the RPM should be lowered in 10% increments until the wear is along the cutting edge and the corner remains pristine.

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If there is evidence of chipping or cratering along the cutting edge point, the feed rate should be lowered.

 

 

 

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If there is build-up on the OD, it is usually a result of too much heat and the concentration levels should be checked to maintain 10% – 12%.

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