I bought a Millers Falls No 7 Jointer Plane a few weeks ago that had a pitted blade in it. While most people would look at a blade like this and immediately think that it belongs in the trash, I decided to see if I could get it to work well enough to slice thin shavings off a piece of cherry.
The first thing I do when I sharpen any of my blades is to whip out my Tormek sharpening wheel. I’ve owned the Tormek for several years now and have never regretted the coin I paid for it. I set the machine up to grind a 25 degree angle on the blade and go to town.
A few minutes on the Tormek puts a real nice edge on the blade. The problem is the back of the blade is still pitted causing the blade to cut ridges in the work piece while using it in the plane.
I used the side of the wheel of the Tormek to try to flatten the back of the blade, but after a few minutes I wasn’t really getting anywhere. It did help, but it would have taken hours to remove all the pits.
I decided to give the old ruler trick a try made famous by David Charlesworth and remove only the metal at the front of the blade. I stick a thin ruler at the back of the blade and sharpen the backside of the front of the blade by moving it back and forth on a piece of 320 grit sandpaper. This in theory changes the cutting angle of the blade by a few degrees, but honestly, who cares? There is very little difference between a blade with a 25 degree angle and one with 24 or 23 degrees. It may make a difference with hard exotics, but I normally use poplar, cherry, maple and southern yellow pine. I’m too cheap to buy hard exotic wood.
As you can see if you look closely, the ruler trick worked. The very front edge of the back of the blade is clean of any pitting and will hold an edge better.
I then switched to my water stones and hone the edge created on my Tormek. I use a combination stone of 800/4000 grit and a final 12000 grit stone. I use water stones as opposed to oil stones simply because the Tormek is a water stone. Oil and water don’t mix.
Here is my final sharpening of the blade. Pretty good if you ask me.
Here’s the blade in action cutting cherry. After a few adjustments with my plane, I was able to produce nice clean shavings. The cherry underneath was glass smooth after it was planed with the blade.
How thin were my shavings? About .003″ thin. Not too shabby for a piece of crap blade that most people would have never even given a second chance and would have just thrown in the garbage.