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Knife Sharpening Tricksby TimAndersonon June 24, 2006

Table of Contents

Knife Sharpening Tricks .......................................................................................................

Intro: Knife Sharpening Tricks ...............................................................................................

Step 1: Look at the Edge ...................................................................................................

Step 2: Thumbnail test the edge .............................................................................................

Step 3: Flatten the Stone ...................................................................................................

Step 4: Flatten Away ......................................................................................................

Step 5: Thin the Edge .....................................................................................................

Step 6: The Sharpening Finally Begins ........................................................................................

Step 7: Gilding the Lily ....................................................................................................

Step 8: Cut Your Leg Off ...................................................................................................

Step 9: Don Montague Tests the Edge ........................................................................................

Step 10: Improvised Sharpening Stones .......................................................................................

Related Instructables ......................................................................................................

Comments ..............................................................................................................

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Author:TimAnderson author's website

Tim Anderson is the author of the "Heirloom Technology" column in Make Magazine. He is co-founder of www.zcorp.com, manufacturers of "3D Printeoutput devices. His detailed drawings of traditional Pacific Island sailing canoes are at http://www.mit.edu/people/robot.

Tim's philosophy involves building minimum-consumption personal infrastructure from recycled scavenged materials.Redirecting the waste stream. Doing much with little. A reverse peace-corps to learn from poor people all over the world.

Intro: Knife Sharpening TricksThere are many ways to sharpen a knife. This method produces a good general purpose edge.

Safety note: As my Granddad used to say: "Don't cut toward yourself, and you'll never get cut."Excellent photos by Christy Canidathe whale butcher.See what she does with these knives at Skinning and Filleting Catfish

People have always cared about sharp tools. Some "Bog Man" remains from thousands of years ago have been found with sharpening stones worn as a pendant

This first video shows how to make your own Bog Man stone from a regular sharpening stone, or any soft abrasive stone you happen to find.

First we will make a drill bit from a nail, drill a hole in the stone, saw the stone in half, and flatten it. Just like an ancient bog man would have if he had the battery dfixed last week.

This second video shows how to sharpen a knife for butchering and how to sharpen it for carving wood. I bought the knife in the video from a husband-and-wife teblacksmiths in China. Blacksmithing seems to be a job for couples in many parts of the world.

Links to the ipod formated videos are at the bottom of this page.

http://www.instructables.com/id/Knife-Sharpening-Tricks/http://www.instructables.com/id/Knife-Sharpening-Tricks/http://www.instructables.com/ex/i/D0A58B6855081029AC23001143E7E506/http://www.instructables.com/ex/u/canida/http://www.mit.edu/people/robothttp://member/TimAnderson/http://member/TimAnderson/

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Step 1:Look at the EdgeGet under a bright light such as the sun, and hold up the edge. You'll see reflections on flat spots and nicks.On this blade the inch near the tip is pretty bad.

Step 2:Thumbnail test the edgeTouch it to your thumbnail and see if it slides around or if it catches.If it slides that means it's dull, as in not sharp, at least in this area.Safety note: Don't chop your fricking thumb off.

Step 3:Flatten the StoneBuy yourself a sharpening stone for a dollar in Chinatown. If your city doesn't have a Chinatown, get one or move somewhere civilized.

This is a "water stone" which means you put water on it while using it to float the sharpening dust off it. Some prefer an "oil stone" which means you put oil on it. S

stones are born oily. Once the oil is in there water doesn't work well anymore.

This particular stone has had some use so it's dished out in the middle. That makes it hard to hold the knife at the right angle. So we'll need to flatten it.Actually it doesn't really matter for knives, but when you start sharpening plane blades you'll make a religion of flattening your stone.

Step 4:Flatten AwaySplash some water on the sidewalk and rub the stone on it til the stone is flat. Use plenty of pressure.Listen to "The Great War for Civilization" by Robert Fisk while you work to understand what went wrong in the Middle East.

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Step 5:Thin the EdgeRub the knife on the coarse side of the stone at a 5 degree angle as shown. It doesn't matter what stroke you use or what direction.You're just thinning the area around the edge a bit to save you some labor later on.In each of the following sharpening steps, you'll raise the angle just a bit.That way you're always shaving the stone with fresh metal.

Commentators to this howto are rightly pointing out the merits of a 20 degree knife edge, (knife held at a 10 degree angle to the sharpening stone) or a 17.5 degrewedge. I think my homemade plane blade sharpening fixture is set at 27.5 or something nerdy like that.

Use your own numbers, not mine, and by all means get carried away with your own refinements.The numbers I picked aren't too important, just that you raise them with each step.

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Step 6:The Sharpening Finally BeginsFlip the stone over and stroke the blade edge forward at a 6 degree angle. First one side of the knife, then the other. You are cutting toward the stone.

Step 7:Gilding the LilyYou've already endangered your friends by putting on an edge on a knife they're expecting to be dull.Now it's going to get even sharper. Get a piece of 600 grit emery paper and put it on a piece of glass.Any other really flat thing will do, but glass is most popular. I've seen Klingit and Mayan woodcarvers use this method.Stroke forward at a 7 degree angle, alternating sides. A couple of strokes is plenty, because you're taking off a miniscule amount of metal. If you're silly or special could get finer grits up to 1200 and repeat.

Hats off to the commentators for true facts about edge angles. Unless you're into artillery in a big way, most of us will overestimate small angles. Your 7 will be mo12 in reality. The important thing is to look at the edge, test it, and raise the angle til you're shaving just a little abrasive off with each step. Thick blades will naturasharpen at the higher angles they were intended for. You'll never really thin a thick blade out that much.

Some things like plane irons and chisels benefit from a straight bevel. For that make a jig to set the angle. Plane irons seem to inspire the greatest nerdiness in pe

Step 8:Cut Your Leg OffNot.This step is a totally unnecessary way to show off. You can impress people this way, especially if you rip your leg open, blood gushes everywhere, and they have you to the hospital.

Smear your leg with the abrasive paste you made by flattening your stone.Then stroke the knife over this paste, sharp edge trailing.This is called "Stropping". It takes the microscopic hairs off the edge to make it strong and extra sharp.This is how you sharpen a razor, except sane people use a piece of leather called a "strop" rubbed with red garnet abrasive dust.

My Granddad used to beat his kids with his strop when they misbehaved. His son, my uncle "Bird Dog" tried to shave without proper instruction and cut a big gashstrop. In the ensuing punishment the new sharp corner cut him, he started bleeding all over, and my Grandmother Nana came flying out of the house with strong ntheories about corporal punishment. She was half my Granddad's size and twice as powerful. The kids were able to eat dinner sitting down for a while after that.

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Step 9:Don Montague Tests the EdgeHis style of fingernail testing involves resting the edge on his nail to see if it slides off or catches.

Step 10:Improvised Sharpening StonesThere you are in your friend's kitchen trying to cut a tomato with a blunt knife.You're mashing it and smearing the skin around and not feeling sexy at all.You ransack the utensil drawer and find not an abrasive.You get the urge to criticize your pal for being the wrong kind of tool-using ape.

Halt.Use an improvised stone instead. Here's a short list of what can work:

The underside of the toilet tank l id.The rough unglazed ring on the bottom of a plate or other ceramic item.an emery board used for manicuresA brick.A flowerpot.Any aluminum item. It's covered with a layer of aluminum oxide, a good abrasive. This method is only good for final sharpening.

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Comments

50 comments Add Comment view all 182com

=SMART=says: Jun 22, 2009. 10:07 AMThanks for the info ! Entertaining as ever !

=SMART=says: Jun 22, 2009. 10:35 AMIt seems the sharpening grit has snuck into my knife's opening mechanism....

ilpugsays: Jul 5, 2011. 8:30 PMblast it with Canned Air or an air compressor.

knifesharpenersays: Oct 15, 2009. 3:19 PMthank you for teaching me one day i got home from school took a showerand as i was in the shower some onee broke in and good thing my knifewas rnext to me or maybe i wouldnt be here

ilpugsays: Jul 5, 2011. 8:30 PMtwo things: (1) what did you do to the person who broke in? and (2) you shower with a knife?

djscsays:Nov 10, 2010. 12:16 PM

I think ineed to practice. tried this for the first time today on a 3" folding knife (stainless), It was completely blunt before, it's a bit better now, but by no mtruly sharp. Do I need to grind more agressively, for longer?

maurice1993says: Jun 13, 2011. 12:31 PMwith my 2 years of knife-operator (I used to cut leather in a shoe factory) you'll possibly will achieve sharpening, but it'll take forever. just use a morabrasive stone, ou sandpaper. I often had to made knives with raw stell, I sand papered them in the sander, first with high profile sandpapers, afterlow profile, and finally, the stone, first the more abrasive, than the low abrasive side of the stone.

and by less than 15 minutes I had a well sharpen-as-hell precision knife ready to use.

with your folding knife I recomend you to use just a little more pressure, and sharp first the the 'heavy' side of the stone, and when it's barelly cuttinthings, you refine the work on the 'smoth' side of the stone.

sorry the poor english. I'm still learning ;-)

todbickssays: Sep 2, 2009. 6:04 AMA comment to the author from a British citizen with blunt knives. Your Step 8 begins as follows: "Cut your leg off. Not" Why add the "Not" afterwards ? UK we would never do that. Your joke consists in the fact that you make it seem you mean it which would constitute a kind of irony (although a weak foit)....and then you go ahead and spoil it with that "Not" thing? I'm gonna go away now and cut my wrists. NOT REALLY. I'M ONLY JOKING.

kikiorgsays: Jun 9, 2011. 2:19 PMI had remembered the "...NOT!" phrase from Wayne's World, circa early 90's, which made it very popular at the time (and likely lost on internationaas well as those under 25yo,) but when I geeked out on it a bit, I found this:

http://en.wikipedia.org/wiki/Not!

Apparently it goes back to 1893!

_Scratch_says: Jun 5, 2011. 5:36 PMI approve of this message.

danlabsays: Nov 22, 2009. 10:12 PMYou sound like someone that needs to watch Borat.

thestyrofoampeanutsays: Feb 14, 2010. 9:10 PMmy name-a boratgive me your tears gypsy or i shall take them.......

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valhallas_endsays: Nov 13, 2009. 8:23 PMAmericans love a lawsuit. Fine print alleviates that danger. Ergo, not.

frogmeetcogsays: Feb 16, 2011. 11:12 AMJust a thought: with the many, many shoes that step on sidewalks every day, grinding little divots out of them with grit and pebbles... how flat is a givensidewalk going to be?

tightsweatersays: May 26, 2007. 9:40 PMhttp://www.furitechnics.com.au/Ozitech/ozitech_main.html

stones and steels will be needed no more...

masterochickensays: Feb 7, 2011. 2:42 AMseeing as that page 404d, your statement way be less than accurate.

masterochickensays: Feb 7, 2011. 2:40 AMDo you suggest any specific angle for cutting hard rubber?

binky82says: Jan 17, 2011. 8:10 AMdon't slide to cut, just see if it catches, just touch your nail and don't move it, sharp it should stop sliding and just catch 'on' the nail, not'in' the nail.

Lighthousesays: Jun 27, 2006. 7:06 AMMy house is over a 100 years old. Most of the electric system of the house was old fashioned "knob and tube." The knobs are ceramic insulators wherwire wrapped around to change direction and the tubes are hollow ceramic rods that insulate the wood when wires pass through joists and studs. Thostubes make great touch-up rods. I have a couple laying around wherever I have sharp edges in the house or shop. I usually mount 'em on the end of ato keep my fingers clear of the business end of things.

jack8559says: Nov 12, 2010. 9:04 PMThe ceramic tubes in high pressure sodium light bulbs (industrial) work great too! Get one from a really big bulb (say, 1000 Watt) and set in a woodhandle with epoxy, but remember that if you drop it, it will break and be totally useless. Go to a place where they use them and ask for a burned ousince the bulbs are about 45 dollars each new....

MisterHankiesays: Aug 6, 2010. 7:54 PMYou can also sharpen a knife with the top of a car window rolled about two thirds of the way down.

cool2000says: Mar 19, 2010. 7:15 AMDoes tile work?

bombmaker2says: Jun 7, 2010. 3:10 PMif it is unglazed, than yes it will work.

danlabsays: Aug 20, 2009. 9:14 PMSo I am wondering where I could find emry cloth with a grit finer than 600. I checked both Lowes and Homedepot and they only carry up to 600. WouldMichaels carry this?

Vulcanatorsays: Jan 7, 2010. 2:44 PMpaint store (like Sherwin Williams) or a tool shop

moosetoothsays: Jan 1, 2010. 12:29 PMTry NAPA or anyplace that sells automotive body repair and painting supplies.

ehmbeesays: Sep 20, 2009. 8:05 PMGo to Micromarkand browse their sanding papers-they are for the scale modeler primarily, but their grits go up to 12000 in the case of the plexiglapolishing kits. You should be able to get a sampler assortmentof their papers that will pick up where 600 leaves off. The other nice thing is, IMHO,are the perfect size for sharpening. Best of luck.

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danlabsays: Nov 22, 2009. 10:14 PMThanks for the info, I found that auto part stores usually carry up to 2000 grit in the "finishing department" and that is way more than fine enougsharpening etc.

weaponscollector94says: Jan 1, 2010. 1:04 AMmy dad used to beat me with a strop

gitmsays: Oct 12, 2009. 8:35 AMI use the pad of my finger. I run my finger over the edge perpendicular to the length of the blade and without pressure. I also polish the blade, which I'vfound can make a fresh razor even sharper. There is a dramatic difference in the performance of gouges once they've been polished.

weaponscollector94says: Jan 1, 2010. 1:02 AMhow do you polish the edge?

revcdubsays: Dec 30, 2009. 9:01 PMOld ceramic-cased ICs are hard and abrasive enough to cut steel, and finely grained enough to leave a smooth edge. Hone dry. I'd rate them somewbetween hard white and hard black Arkansas.

rockhoppermediasays: Dec 30, 2009. 2:43 AMReally good instructable, I lost my stone whilst camping and improvised by winding down the window on my car and using the rolled edge. Got a gooresult from it.

wupmesays:Dec 29, 2009. 4:39 PM

I'm actually about to get a wet grinder to make that work far more easy.2 really big really slow rotating (30rpm) stones.One is a mesh 2000 thats always wet with a water bath at its bottom..The other one is actually a leather belt for the final touch.Oh my knives and i will love it. And the scissors too yep.

Sorry just had to say that, i'm so looking forward for this buy since months ^

mikstr2says: Dec 29, 2009. 10:52 AMi sharpen my knives with scissors. its actually pretty effective

cowscankillsays: Aug 24, 2009. 5:48 AMIf I get a brick wet, willl it work the same as a wet stone? I have sharpened stuff with a brick before, just not wet...

TimAndersonsays: Aug 24, 2009. 7:00 AMsome bricks make great sharpening stones. Wet is good, and it's good to rub it on another brick or pavement to flatten it. Often they have harder cceramic embedded in them, if you don't flatten it first these can nick your blade.

cowscankillsays: Aug 25, 2009. 7:02 PMHere is a dagger I just made http://www.instructables.com/id/Making-a-Dagger-from-Found-Materials/The sword will use some of the same techniques, but I will sharpen the sword better.

cowscankillsays: Aug 25, 2009. 1:39 PMWow really? Thanks! I plan to make a sword and post it, so sharpening it with a brick is very helpful news :D

TheBackyardInventersays: Jul 31, 2009. 1:47 AMI sharpened my swiss army knife till its like really sharp and it doesnt slide accross my nail or catch on my nail it doesnt really slide but it makes some powder

jrsh92says: Aug 19, 2008. 3:21 PMI use a pretty average angle for my Opinel no. 8 knife, somewhere a touch over 17 degrees. I've seen a few people with these knives using a far shalloangle, using the entire bevel of the blade to come to an edge, the only angle coming from the thickness of the blade-- about 5 degrees! With the kind owe do with them, these knives need resharpening very regularly no matter what angle is used, as we do things like scale fish, which destroys the edgematter what angle it's at. Having an edge that would normally only last 2 or 3 days is irrelevant if you're just going to do something like that and resharpafter a day at maximum. Certainly I like a 20 degree angle because it's a good compromise, but people should consider that if you're going to be sharpit pretty often as part of your routine, using a shallower angle will allow a sharper edge quicker when sharpening, and in that case you can live with thethat it doesn't last as long as a steeper angle. Overall I'd suggest that people experiment, especially if you have an inexpensive knife like an Opinel, towhat works for them doing what they do with the knife.

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5/26/2018 Knife Sharpening Tricks

10/10http://www.instructables.com/id/Knife-Sharpening-Tricks/

AustralLordsays: Jun 3, 2009. 3:06 PMif your knife dulls like that, get a better one. If they fail you again, look for steel (not stainless!!!) knives, they're the real deal and almost indestructa(but of course it takes a bit longer to sharpen).

baneatsays: Aug 24, 2008. 3:08 PMI don't know why but whenever I buy one I lose it pretty quickly :(

xsamusaranxsays: Dec 31, 2008. 9:13 PMThanks, never tried it this way I bought one of those three stone kits but I'll see if this works better. I test mine by cutting my arm hairs, I'd hate to destrfingernails.

AustralLordsays: Jun 3, 2009. 3:03 PMit doesn't do any damage to your nails, if it sticks, it's sharp, if it slides, it's dull or faulty.

AustralLordsays: Jul 10, 2008. 5:41 PMI do it prependiculr to my thumbnail, is that ok?

jkehrtzllsays: Mar 18, 2009. 2:09 PMstupid....dont do that, take a piece a paper, hold it vertically and see i f it cuts or rips the paper.......if it rips its dull. my buddy used his thumb nail anwent rite thru

AustralLordsays: Mar 18, 2009. 7:06 PMyour friend must be malnutritioned

jkehrtzllsays: Jun 1, 2009. 7:38 PMokay....you just suck at sharpening knives. if it does NOT go through, then it isnt sharp enough lol

AustralLordsays: Jun 3, 2009. 3:01 PMReally, if you slice into your freaking nail you must be mental. I've got it now, the nail method requires you to put the edge perpendiculathumnail and then slide it off the nail- not along the edge (like -------), but parallel to it (|||||). If it doesn't stick to the nail, try sharpening it because there's most likely a fault. Also the paper way is another good method, just to see how easily and cleanly it slices through, but always do at least both.

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