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Sharpening Your Chisels & Plane Blades

100-001_large Sharpening your chisels and plane blades

I've said it before and I will say it again, I like sharp pointy things.  This does not make me a psycho, it makes me a woodworker.  Woodworkers inherently are drawn to sharp things because we know it will make our jobs easier.  Try and cut some white oak with a dull blade and see how frustrated you become, but put a sharp blade in and the world is your oyster.  This goes doubly for hand tools which are powered by our own body strength.If you have a dull chisel or hand plane, you are going to be pushing twice as hard and getting twice as frustrated.  This is why learning to sharpen is so important.

Sharpening can be a frustrating task for a beginning woodworker or even an experienced one who has never used hand tools.  It seems mystical and mysterious, a task only to be attempted by masters of their craft.  Bull.  I said it.  Anyone can sharpen.  There are a ton of different ways to sharpen, from mechanical grinding wheels (both high and low speed) to free hand sharpening to using a honing guide.  The way you decide to sharpen is entirely up to you and how you have been taught.  There are probably a thousand different ways to sharpen hand tools and all of them are correct if they give you a sharp tool and are easy for you to do.  I am going to walk you through my way, which is a conglomeration of different techniques I have learned over the years.  It is what works easily for me and seems to work well for the students I have taught.

The first thing you need to understand about sharpening is what you are doing and why.  You are creating two distinct surfaces, one flat and the other beveled. Getting these two intersecting planes as sharp as possible is the name of the game because where they meet is the edge of your cutting tool.  This edge, if sharpened correctly, is then able to cut through wood with relative ease.  A very sharp plane blade should leave a surface on your work that you barely need to sand.  A sharp chisel should be able to pare the hardest cross grain wood with only minimal grunting effort on your part.

There are multiple sharpening substrates that we can use.  There are water stones, oil stones, diamond plates, sandpaper, and assorted grinding machines.  All will work effectively to create a sharp edge for you.  I personally prefer Norton water stones in the 1000, 4000, and 8000 grits.  This is mostly because they were what I was originally taught on and I have stuck with them.  They seem to give me a very sharp edge with my method of sharpening and I can re-flatten them very easily.  I also like to use the DMT DuoSharp Diamond Stones.  The coarse ones work well for me as a lapping plate to flatten my Norton water stones and for when I need to get my chisels and plane blades reground to a new bevel fast.

img_7629 Choose a set of sharpening stones that work best for you.

The honing guide you choose is again a matter of personal preference.  I typically have used two types in the past, but with the new improvements to the Kell No.2 honing guide, I have primarily switched to the Kell.  What I like about the Kell is its versatility.  It accepts the smallest chisels you have to the largest plane blades as well as Japanese chisels.  This is something most of the other guides on the market can't do.

img_7630 We love the Richard Kell Honing Guides. Beautiful to look at and holds your blade

Flattening The Back - Ok, first things first, we need to flatten the back of our hand tool blades.  On a chisel, you need to flatten a good portion of the back.  We want the back of the chisel to be flat for when we are paring or mortising so that we can maintain a straight line of cut.  With the plane blade, we only care about the front edge because the plane body is the flat surface that the wood will connect with.  To sharpen the plane blade we will use the ruler trick.

With my blades, I first try to get the backs flat on a 1000 grit Norton water stone.  If it looks like they will flatten easily with that, then I work my way through my 4000 and 8000 grit stones next.  If they don't look like they will flatten easily, then I'll step down to either 100 or 200 grit sandpaper or coarse / extra coarse diamond stones and flatten them quickly.

To flatten the chisels, I hold the blade at an angle on one side of the stone and using light pressure and letting the stones do most of the work, I start to move the chisel back and forth being very careful to maintain even pressure across the front of the chisel while trying to achieve an even scratch pattern across the chisel back.  I will then switch to the other side of the stone and place my chisel at the reverse angle from the first side.  The goal is to try and reverse the scratch pattern from the first side by erasing all of the first side scratch marks.  Once you have done this, you can move on to the next grit of stone.  On a brand new chisel, this may take a bit of time.

You will basically repeat this process through your different higher grits.  As you start on your highest grits, you will start to notice that the back of your blade becomes more polished and mirrored.  This is what we are looking for.  Now, you may also see that some spots are still a little duller looking.  This is OK the duller portion is located in the interior portion of the back but not OK if you see dullness out on the edges.  You want the sides and front edge to be super flat and polished since this is what the chisel back will ride on.  The interior surface can be a little concave and that won't hurt anything, in fact, there are some chisel manufacturers (and Japanese style chisels) which produce a hollow backed chisel, making flattening of the back easier.  Flattening the back of your chisel for the first time may take a little bit of time.  Don't take shortcuts, spend the time.  It's worth it and hardly ever needs to be redone. In the photos below, you can see the progression from a dull finish to a mirror polish.  Technique is more important than speed in these steps.

img_7650 Flatten the back of your chisel to a mirror polish by going through all of the grits on your sharpening stones..

img_7633 You are looking for an even scratch pattern across the back of your chisel

img_7634 Reverse the direction you are sharpening to make sure your scratch pattern is even

img_7637 As you go through your grits and get to finer stones, you will start to see a reflective surface on the back of your chisel

img_7639 And we have a mirror image

Once you have a nice flat back on your chisel, you are done.  With the plane blade, it's a little bit easier.  All we are trying to flatten is the front edge of the back.  To do this back bevel, you simply lay a ruler on one side of your stone and lay the back part of your blade over basically making your blade lay at an angle.  Then with either a side-to-side motion or a small front-to-back motion, flatten that edge using progressively finer grit stones.  This should go fairly quickly.

img_7653 On a plane blade, you will want to use the ruler trick

Sharpen The Beveled Edge - Once our backs are flattened we need to sharpen the bevel edge of the blades.  You may also need to re-flatten your stones at this stage if you have done a lot of work on the backs of your blades.  This is done the same on both chisels and plane blades.   Determine the bevel angle that you want for your chisels or planes (most come from the factory ground to a set degree, feel free to change this to whatever works best for you).  You can use a bevel gauge to determine your angle if you don't already know it.  We use the lovely 12 point brass bevel gauge from Kell for this.  Set the honing guide and blade to your angle of choice (I show how to set the Kell honing guide in this blog) and proceed again to your 1000 grit water stone.  You will go in a back-and-forth motion on the 1000 grit stone until you see an even scratch pattern across the entire face of the bevel.  You should also at this stage notice a burr developing on the flattened back of your blade.  If you can feel this burr, you know that your front edge has been hit (this is a very good thing).  You want to feel that burr across the entire front edge. Once you have achieved that consistent scratch pattern across the entire bevel, you can step up to your next grit.  Whenever you move to a finer grit stone, make sure that you are rinsing off the wheels on your honing guide.  You want to be careful about bringing grits from one surface to the next.  Again, you will go in a back-and-forth motion across the stones, looking at the bevel periodically to see if that consistent scratch pattern has been achieved and all of the previous stones scratch marks are erased.  When you come to your final grit stone, you can either continue to sharpen at your current bevel angle, in which case just simply keep going until your scratch pattern has been achieved, or you can switch to a secondary higher bevel.  I prefer a secondary bevel angle on my tools because it allows me to resharpen quickly.  To set the secondary bevel, simply set your guide up to its next highest angle and proceed to sharpen on your highest grit stone.  I do this only on the pull stroke for about 20 pulls.  I then look at my front edge to see if there is a consistent fairly even line across the front edge of my chisel.  It should look like a nicely polished mirror on your front edge. Let me just say that it is very hard to photograph shiny reflective surfaces.

img_7645 Using the honing guide, you can start working the bevel upwards through your sharpening stones grits.

img_7641 Work the bevel until the scratch pattern is across the whole face of the chisel


img_7642 Once you have worked your way through all of your grits, you can add a secondary bevel to help make future sharpening easier

img_7644 Work the secondary bevel to a mirror polish on the 8000 or comparable stone

Remove The Wire Burr - Wait, there's one last step before we are done.  I know you have these two beautiful polished edges that you want to cut something with but we still need to remove the burr from the back of the blade.  It's OK, this will be quick.  Pull the blade or chisel out of your honing guide and simply rub the back across the stone 4-6 times to remove the burr (with the plane blade lay out the ruler again).  This next step is critical, slide the back off the edge so that the front edge of the blade tilts up away from the stone.  We don't want to gouge the stone and ruin our blade's edge at this point.

Now, let's check sharpness.  There are many ways to do this, the safest being to slice a piece of paper. I typically shave the back of my hand, resulting in woodworker's pattern baldness (thanks Tom).

Having a secondary bevel comes in handy when it comes time to resharpen your chisel or plane blades. You can simply set your guide to its higher bevel angle and resharpen, making your secondary bevel line a little wider.  You can do this all the way up until you need to resharpen your bevel.  Its a great time saver.

Also, please make sure to keep your stones flattened using a lapping plate, flattening stone, or coarse grit diamond stone.  If your stone is not flat, your blades will not be either.

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