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Rob Cosman's Sharpening Rule

Sharpening Rule
  • Sharpening Rule
  • <iframe width="640" height="360" src="https://www.youtube.com/embed/f6n281l9ZnM" frameborder="0" allow="accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe>
  • Sharpening Rule
  • Sharpening Rule
  • Sharpening Rule
  • Sharpening Rule

Rob Cosman's Sharpening Rule

91 reviews

Regular price $9.95 USD Sale

86 left in stock.
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Customer Reviews
KITs

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 long, .018 inch thick sharpening rules custom made without ruler etchings to allow plane blades to glide smoothly across the rule when executing the "ruler trick". 

Customer Reviews

Based on 67 reviews Write a review
Customer Reviews
4.9 Based on 91 Reviews
5 ★
97% 
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SL
03/20/2023
Steven L.
United States United States

Sharpening Rule

This is the second rule that I got from you since I lost the first one so I bought a second one, Of course as soon as soon as the second one arrived I found the first one :-) I love your products and your show. I'm a Navy Vet and can't tell you how much I appreciate your work wth disabled Vets. Keep up the good work.

DO
03/18/2023
Denny O.
United States United States

Old dog, never too late to learn

Rob suggestions on what products that are available to get the sharpening tasks accomplished are spot on, by taking the advice from his sharpening video, has opened this seventy five year old eyes. Good work Rob. Denny O’Neil, Cape Cod

DA
03/17/2023
David A.
United States United States

Sharpening Rule

On the one bench plane I have, the blade from the manufacturer was not square, so that has taken a lot of work. I haven't given up on it yet, but it is a blade issue, not the rule or the sharpening stones. I have enjoyed working with all of my RC products. They perform as advertised. Thank you.

MM
03/07/2023
Mark M.
Canada Canada

Moxon vice hardware, sharpening bits

Outstanding. Exactly as advertised. Great service with a real personal touch

BR
03/02/2023
Brandon R.
United States United States

Sharpening Rule

My experience using the sharpening rule was great! It’s the only way to go for fast plane blade sharpening!