Knife sharpening
All knives will need to be sharpened at some point in time. Yes, all knives dull. Even knives that are not used will dull with age – metals corrode from moisture in the air.
For safety you should keep your knives at their sharpest. A sharp knife does not roll off of the surface that it is cutting. A sharp knife does not need extreme force to slice, dice, or chop through an item. Rolling edges and forcing blades has been the cause of many a kitchen accident. Cut with ease and safety - always keep your knives sharp.
Using a Sharpening Steel
These directions are intended for use with a plain or straight edge blade.
You need a cutting board, a kitchen towel, sharpening steel and knife or knives to be sharpened.
Place folded towel on cutting surface.
Hold Sharpening Steel straight down. The tip will be in the towel and touching down to the cutting board. Like a pole with the handle at the top.
The movement is as simple as the swing of your arm. You start by placing the heel, or back end of the cutting surface against the steel it’s width plus ¼” down from the handle bottom. Make sure that the heel and blade are comfortably away from the hand holding the steel. Now simply pull the knife downward and toward you with the blade sliding down the sharpening steel. A knife may need only 4 to 10 of these strokes on each side of the blade.
To get the best edge on your knife you need to try to match the angle of the original edge. However, unless you are protractor happy it is not quite possible. Luckily for us kitchen knives are mainly cut with the same edge bevel. So, to match as closely the industry standard we’ll use a 22 ½ degree angle. Place the heel of the blade at the appropriate space on the steel – now hold the blade at a 90 degree angle from the steel. Okay, now eyeballing it bring the spine of the blade half way closer to the steel handle. You now have a 45 degree angle from the steel. Get that trusty eyeball ready – we are cutting the angle in half one more time. You now have a 22 ½ degree angle. Now go ahead and pull the blade from heel to tip down the sharpening steel.
After a few strokes a ‘burr’ will form. On very close inspection a burr looks like the crest of a small wave. The burr will curl away from the sharpening surface. If you stop sharpening before the burr is formed, your knife will not be as sharp as it could be. Sometimes you can’t see a burr, but you can always feel it. Check for the burr on the side opposite the edge you have been grinding. Hold the knife blade horizontally and place your fingers or thumb at a 45-degree angle to the edge and pull gently down and away.
NEVER PULL TOWARD THE TIP OR HILT; YOU MAY LOP OFF A FINGER. PULL AWAY FROM THE EDGE.
Remember, check the side opposite the one you've been sharpening. You're checking for a very light lip caused by the edge rolling over to the other side. Check at various points along the edge. The burr tends to form quickly at the base of the blade but takes a little longer at the tip. You must feel a burr running all the way from heel to tip to know that you have fully ground that side of the knife.
Kitchen perfectionist?
Here’s more blade angle information.
For the vast majority of kitchen knives, 15 to 20 degrees per side will provide a significant increase in performance without requiring undue maintenance. Meat cleavers should be a little thicker, say 20 to 25 degrees per side, while dedicated slicers can be taken down to 10 to 15 degrees per side. The best compromise in the kitchen has proven to be a 15/20 double bevel. That is a 15 degree back bevel with a 20 degree primary edge face.
You must be able to maintain a consistent angle while you are sharpening. This can be tough to do, which is why there are so many gimmicks and sharpening systems on the market. They don’t provide any magic. All they do is help you keep your edge at the same angle throughout the sharpening session. Maintaining consistency is a primary reason freehand sharpening is a little tricky. It takes a lot of experience and practice to keep the edge at a constant angle stroke after stroke using only your hands and eyes.
Handling Serrated Knives
Serrated knives and bread knives are a special case. Serrated knives will stay sharp longer than plain edged knives, mainly because the insides of the serrations generally don’t contact hard surfaces. That’s what the teeth are for. The teeth not only have a cutting function, but are also sacrificial lambs, offered up to steakhouse swordsman and children everywhere who feel that if they’re not grinding into the ceramic of the plate, they’re not cutting.
There are four ways to sharpen serrated knives:
1) Pretend the serrations don’t exist and sharpen on a stone, sharpening system or electric sharpener as you would a plain edged knife.
This will eventually remove the serrations.
2) Sharpen the flat, non-serrated back of the blade.
This will sharpen the knife, but also will eventually remove the serrations, though not as quickly as the first method.
3) Sharpen the serrations individually with a tapered diamond or ceramic file.
4) Sharpen on a crock stick setup, going very slowly so the ceramic rod glides in and out of the serrations.
Serrations do two things. First, they increase the cutting or slicing angle of the portion of the cutting edge in contact with the cutting target as the blade is drawn across a surface. Second, fewer cutting edges is in contact with the cutting target for the pressure applied. Combined these two physical changes in the cutting motion are similar to creating lots of "stabbing" cuts applied uniformly across a cutting target. Serrated edges should be sharpened with a fine to extra fine grit (600 to 1200) abrasive file.
Maintaining the desired angle may seem tough … BUT is no different than any other blade. I have found the easiest technique to place your thumb on the backside of the blade and rest the edge of your thumb on the file. Next evaluate the section of the file that fits the serration to be sharpened. Rest your thumb and the blade on the file so that the deepest part of the serration touches the file. Pulling the blade back up the file toward the handle will produce a consistent convex edge on the individual scalloped cutting surface. This technique is repeated on each major scallop. Many serrated edges have "V" shaped serrations between the major scalloped serrations … I generally ignore these or reshape them into rounded scallops. A second, less desired technique for sharpening a serrated edge is to hone the single sharpened edge on a flat abrasive just like the hard coated blades described above. Only a small part of the cutting edge will contact the abrasive … changes will occur rapidly so check the edge often. This technique will cause the loss of the two physical advantages of serrations. The loss will be slight at first, but you will eventually lose the serrations … if you are like me and don't like serrated edges, it is no big deal. But if you like your serrated edge buy a fine grit file made for sharpening them … use it or lose it. By the way, the biggest reason I dislike a serrated edge is they take too much time to keep sharp
Steeling your Knife
Steeling regularly is the most critical maintenance you can perform on your knife. Whenever you use your knife, especially soft kitchen knives, the edge can turn out a bit. Turn the knife with the edge pointing to the ceiling under strong light. You shouldn’t be able to see it. The edge itself should be invisible. If, however, you see glints of light, those are spots where the edge has rolled. The edge is still reasonably sharp, it’s just not pointing straight down anymore. The steel realigns the edge of the knife, forcing the rolled spots back into line, making it useable again.
We will get into the various types of steels in just a moment, but be aware that the grooved steels that come with knife sets do in fact remove metal. A grooved steel acts as a file when used with a heavy hand, knocking microscopic chips out of your edge. At the very least, it is much coarser than the fine abrasive you used to achieve your edge. Steeling heavily with a grooved steel is taking several steps backward. A grooved steel should be used with caution and a very light touch. The standard image we all have of steeling a knife involves a chef with his knife in one hand and steel in the other, blade flashing and ringing. If you’re particularly adept at this type of swordsmanship, have at it. It impresses the tourists.
A more effective method is to stand the steel straight up and down with the handle up and the tip resting on a folded towel to keep it from slipping. Why? Geometry. Place the knife edge against the steel with the blade perpendicular to the steel – 90 degrees, right? Rotate your wrist so that you reduce the angle by half – 45 degrees. Reduce that by half – 22.5 degrees, and you are exactly where you need to be to steel your knife (if you have a 20 degree edge). You generally want to steel at a very slightly steeper angle than the edge bevel itself. You can also use the Paper Airplane Trick to make a guide to prop against your steel so you know you are hitting the proper angle. When you’re steeling, lock your wrist and stroke the knife from heel to tip by unhinging at the shoulder – it’s your pivot point – and slowly dropping your forearm.
The key is to maintain a consistent angle all the way through the stroke. By locking your wrist and elbow, you will keep your angle stable from top to bottom. Go slowly and follow all the way through the tip. You don’t have to press very hard to realign the edge. Steeling requires barely more pressure than the weight of the knife itself. Alternate from side to side, keeping the same alignment and angle on both sides. It really only takes four or five strokes per side to get your knife ready for more work.
When should you steel?
Every time you use your knife. Oddly enough, steeling before you use the knife is much more effective than steeling afterward. A steeled edge can be very sharp, but it is not as durable as a freshly honed edge. If you don’t use a steeled edge right away it can actually relax back into its blunted state. The same is true of a blunted edge. If you really degrade the edge of your knife in a heavy cutting session, let it sit overnight before sharpening. It will be in much better shape than it was the day before. You should also steel before sharpening so any rolled or impacted edges are pushed back into alignment. That way you don’t cut off the rolled edge and lose more metal than you really need to. You also can steel after sharpening to add a final bit of polish (especially on a medium to medium fine edge) and tooth alignment. A steel actually “smears” the edge, teasing out a little more thinness. You’ll have a keener edge, but it will be weaker than the freshly sharpened edge.
Types of Steels:
Knife steels come in a variety of sizes, shapes and flavors.
There are round steels, oval steels, grooved steels, smooth steels, diamond steels and ceramic “steels.”
If you purchased a set of knives, it probably came with a round, grooved steel.
Be very careful with this beast. Kitchen knives are reasonably tough and resist chipping fairly well, but a grooved steel can really put that to the test. The grooves in the steel create tiny points of contact with the edge.
A smaller contact area makes for greater pressure on the edge.
Used lightly, a grooved steel can realign the edge of your knife, though it does it fairly aggressively.
Used with too heavy a hand, however, a grooved steel will act as a file and take microscopic chips out of your edge. Your edge will feel sharp because it is now, in effect, serrated, but it won’t last very long.
Coarse diamond steels fall into the same category, though they’ll generally leave a finer edge than grooved steels. They should still be used with caution and a very light hand.
Smooth steels are several steps above either grooved or diamond steels. A smooth steel will gently push the metal of the edge back into alignment. It will take longer than with a grooved or diamond steel, but you don’t run the risk of damaging your edge. A smooth steel is very easy to use and fairly forgiving of sloppy angles.
A step above even smooth steels are fine grit ceramic and very fine diamond steels. According to Cliff Stamp, “A smooth steel just pushes the edge back into alignment, leaving the weakened metal there, which will actually relax back into being deformed in its own time without any use. The ceramic will remove some of the weakened steel while also aligning the edge. The edge will be more stable and stay sharp for much longer.
There is more metal removed with the ceramic and diamond rods, but you are looking at between 100 to 1000 sharpenings to remove one millimeter of metal from the edge of the knife depending on the edge angle and the grit of the ceramic or diamond hone – this is years of constant use.
In general, the lifetime of most knives tends to be dominated by the occasional accidental damage that forces heavy honing.”
Using a grinding stone:
Once a year, twice a year, once every two years-depending on the kind of beating your knives get-you will need to grind them down to form a new cutting edge. You can send your knives out and have them ground by a professional or you can do it yourself.
It is very difficult to achieve the proper angles on blades longer than 4 inches without using an angle guide.
For blades shorter than 4 inches, your finger and thumb can serve as angle guides.
Depending on the side of the blade you are working, place the finger or thumb on the back of the blade and KEEP IT THERE.
Let the finger or thumb rest on the abrasive.
This will form the “Angle Guide”.
Just replace the knife in the imprint formed on the finger print side of your finger or thumb.
It works better if you count strokes or motions and use the same stroke count on each side of the blade.
You will have to adjust the direction of your motion to work the entire length of the blade.
I usually will work each side 100 strokes before turning the blade over.
I assure you if you keep your finger or thumb in a knife blade back for 100 strokes you will be able to see and feel where the blade back was located.
Sharpening Steel
An abrasive rod, usually pointed to allow the steel to rest firmly on the surface, which allows accurate edge control.
Honing Steel
Contrary to what many believe, the honing steel is not a sharpener. A honing steel straightens the blade while a sharpener sharpens the blade. A honing steel is a rod made of steel, ceramic, or diamond, generally about a foot long (although can be longer) and a quarter of an inch thick ( and can be up to 1/2 an inch in diameter). It is used to hone a knife blade after sharpening in order to restore the edge and improve cutting ability. All a steel does, is correct the V angle on the cutting edges of the knife blade, which should be anywhere from 10 to 15 degrees, depending on the type of knife you have. Correct steel technique will ensure a better edge on your knife.