Jointing (sharpening)

For the process of creating a true edge on a piece of wood, see Edge jointing.

Jointing refers to the process of filing or grinding the teeth or knives of cutting tools prior to sharpening.[1] The purpose of jointing is to ensure that all surfaces to be sharpened are of a consistent size and all imperfections have been removed.

Jointing is usually the first step in the process of sharpening:

  • When sharpening a hand saw blade, the teeth are jointed by running a flat file over the tips of the teeth so that they are all of the same height.
  • Circular saw blades are jointed prior to sharpening so that all teeth protrude from the blade the same distance from the centre.
  • Jointer knives are ground until they are all the same length prior to sharpening.
  • The edges of a card scraper are jointed by running the edge over a file or a sharpening stone prior to using a burnisher to turn the burr.

Jointing is usually carried out infrequently as it removes a lot of material from the edge of the blade.

References

  1. ^ Popular Mechanics. Hearst Magazines. June 1977. p. 116. ISSN 0032-4558. Retrieved 2025-10-06.
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