Rob Cosman's Sharpening Rule

Rob Cosman's Sharpening Rule
  • Rob Cosman's Sharpening Rule
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  • Rob Cosman's Sharpening Rule
  • Rob Cosman's Sharpening Rule
  • Rob Cosman's Sharpening Rule
  • Rob Cosman's Sharpening Rule

Rob Cosman's Sharpening Rule

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Customer Reviews

The most innovative technique in plane sharpening over the last 30 years is the "ruler trick" by my good friend, David Charlesworth.

Traditionally, a sharp cutting edge is achieved by honing the back of your plane blade until it is dead flat (this takes a while), then you hone the primary bevel to achieve a razor sharp edge. 

David Charlesworth introduced his ruler trick to save significant time while still achieving a razor sharp edge.  Instead of flattening the whole blade back, he places a thin ruler on the stone raising up the blade about 1 degree so he just hones the leading edge, not the whole back.  David's "ruler trick" works great and I always use it.

You only need one thing - a small thin ruler.  We have our 8 inch sharpening rules custom made without ruler etchings to allow plane blades to glide smoothly across the rule when executing the "ruler trick". 

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