Letter 25112

Do cutting tools require recoating after sharpening?  

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Should a cutting tool that has been coated, be recoated after resharpening.

David Martin
Machine shop - Hartland , Wisconsin, USA

If the remaining coating is intact, it normally does not need recoating. Chrome or TiN are very hard coats that reduce wear. The tool steel portion will actually wear a little faster, so tend to keep a sharp cutting surface longer by constantly keeping a sharp edge of tough chrome. On the rest of the tool, the coating just facilitates the chip removal.

James Watts
- Navarre, Florida

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