Introduction: Crooked Knife

The northern Nomad's woodworking tool. All the northern tribes in North America and Asia have their own version of it. My farm relatives use them to trim their horse's hooves. Whatever wave of invaders brought horse culture to Europe must have brought this style of knife with them.

I made this particular knife years ago from plans in the book "Wildwood Wisdom" by Ellsworth Jaeger, C.1945
Continue on to see those plans...

Step 1: Ellsworth's Plans

His drawings are a bit vague about blade shape. When held as seen in the previous photo, the side of the tip is bent toward you. The side of the blade facing away from you is left flat. Don't grind on that side at all. All the grinding is done on the side of the blade toward you.

He says "He then tempers the blade, hard at first, and draws the temper by heating to a yellow color."
By "yellow color" he means a yellow oxide layer, not a yellow heat glow.
In 1945 everyone would have known exactly what he meant from watching blacksmiths at work. Today these words need further explanation. For more details read "The Making of Tools" or any other blacksmithing book from your local library.

Here's the full text of Ellsworth's book, starting on p. 168:
"Crooked Knife: A common wilderness knife found among the northern Indians and Eskimos is their famous "crooked knife", so called because of its shape. With this knnife the Woods Indian can make many things he needs, from noggins and ax handles to canoes and canoe paddles. It is really an aboriginal draw knife, for in using it, the indian draws it doward him.
The Indians trade for files at the Hudson's Bay posts and make these into knives (Plate 88). A flat file is used, cut down to 4 or 5 inches (A). The small end of the file, or "tang", is left on; for this fits into the wooden handle. The file itself is then ground down to a cutting edge (B). The Indian then heats it to a cherry red and bends the front of the blade as (C) shows. The tang is bent in the opposite direction (D).
He then tempers the blade, hard at first, and draws the temper by heating to a yellow color. The handle is made from a bent root or branch. The tang of the file is placed against the handle and its outline traced upon it. This part is cut out deeply (E) so that the file and a wooden plug (F) will rest flush with the handle. When the wooden handle has been smoothed and shaped to the Indian's satisfaction, he places the file in its notch (G), and the plug is hammered home. The handle is then bound with sinew which shrinks as it dries and binds the blade as with an iron band (H).
Eskimo Knives: The Eskimos make a knife of bone or ivory that roughly resembles a cutlass. This is used to cut the snow blocks in fashioning their snow houses or igloos. Plate 99 (bottom) shows its shape. Another knife used by the Eskimos is the strange crescent-shaped knife called the ullo. This is of steel and is used in numerous ways including the scraping of skins."

Step 2: Knife Details

I made this knife just that way, except I used an industrial hacksaw blade instead of a file for stock.
Some saw blades are made with hard teeth and a soft blade, but the back of this one is hard enough to hold an edge without any hardening/tempering.

I carved the handle from a chunk of an elm tree in our yard that was dying of Dutch Elm disease.
I wrapped the handle with a strip of elm bark to hold the side plug in place. The wood of the handle shrank and gripped the tang of the blade as it dried, so the whole thing is very secure.
The handle is a bit small, since my hand has grown a lot since I made it. It fit perfectly at the time.
Now that I've seen and used many crooked knives, I would make the handle much smaller where it meets the blade.

Elm is really nice wood. It's tough like oak but much lighter. Like oak it has transverse rays in the grain that prevent it from splitting. It's too bad all those trees died. The beetles were only in the inner bark.
The big trunks of those trees could have been sawed into boards to plank longships. But they mostly got burned or just rotted away in people's yards.

Step 3: Hoof Knife Modifications

The quickest way to make a crooked knife is to modify a hoof knife from a farm supply store.
Here's one I made in about half an hour.

Some pet shops carry them with the horse equipment.
The hoof knife tip is for cleaning a horse's hoof. The tip fits into the contours around the "frog", which is the living part of the underside of the hoof. For carving wood you don't need that much of a bent tip.

A Finnish friend gave me this sharpening stone in a leather sheath with Sami glyphs on it. It works perfectly as a sheath for the crooked knife with the blade next to the stone.


Step 4: Cut, Cut, and Straighten

Cut off the end of the handle so it feels better on your thumb.
Cut off the curled-over tip of the blade.
Straighten the blade to suit yourself.

Here's a finished knife next to a stock one for comparison.
Suit the bend to the work you're doing.
The knives used for finishing cedar canoe planks are mostly straight with a slight bend in the tip.
The Salmon People use a crooked knife with a very long handle and a very small bent blade. They use it for carving details on totem poles among other things.

I bought this unmodified hoof knife for $5.35 in a feed store.
It was made in Pakistan. It has a stainless steel blade. Non-stainless is usually better. A blade that can rust is usually much better steel.
Be aware that hoof knives come in right-handed and left-handed versions.
Get the right kind for your handed-ness.

to be continued with details of proper posture for crooked knifing...

Comments

author
earl tb (author)2016-12-22

Indigenous folks across Turtle Island, renamed North America by the invaders, have used the knife for 1000's of years. The Saami people also make crooked knives, just different material. My father often looked for a branch that had some animal characteristic that emerged as he worked the wood. He like poplar root because it doesn't check and is tough as steel after it dries. All prep work needs to be done while green. The plug can be rock maple or ash.

author
vandumas (author)2015-04-08

Impressive

author
toddadams (author)2015-04-06

Very good Work ..

author
undanganpernikahan (author)2015-03-22

That Crooked Knife = Awesome <3

author
abadfart (author)2013-01-10

it looks like an old fashion gutting knife

author
benny8025 (author)2011-06-20

The Inuits does not like to be called eskimoes! It means: those who eat meat

author
BobMarleyFan (author)benny80252011-09-01

Actually directly translated, it means "eaters of raw meat", but, still offensive none the less

author
Underminer (author)2010-08-08

Dude that is an awesome knife! Althou it kinda look's Ghetto.

author
carpe_noctem (author)Underminer2011-02-11

lol capitalize "ghetto"
i like it, it implies a pause

author
Hmff (author)2011-02-11

lol it looks like he wraped bacon around it. but still its a very cool lookn knife good job on the instructable.

author
rownhunt (author)2009-10-16

Fancy I bump into this my dad is into making knifes and he said he might
get working on a crook knife good instructable!

author
awoodcarver (author)2009-06-10

Very nice work ,I bought one of these for a spoon I was making years ago and the cost was very steep for something I used once .........Harder then a gouge to use but it did the job better then a dremel or gouge ........

author
5m17h (author)2009-05-28

What is in the background for your photos? It looks very professional.

author
TimAnderson (author)5m17h2009-05-28

Thanks! It's a big sheet of white paper. I shot the pictures on an overcast day.

author
Jester (author)2009-01-11

sorry in advance for my naiveity, but how exactly do you get the file from being ridged to smooth so I can sharpen it? is there some sort of tool I need? This summer I am supposed to work on a homestead camp a a blacksmith, but im trying to get a little more experience than I already have (mainly j hooks,and campfire sets) do you know of any thing I could do to help with this?

author
Pwag (author)Jester2009-03-16

Toss it in a camp fire and let her get good and hot and let nature take it's course. When you retrieve it form the ashes, it should be hot enough to work with. But then you have to re-temper it again.

author
scafool (author)Jester2009-02-02

They used to heat the files up to bright cherry red and let them cool slowly. That gave them a soft file that could be filed with a good file. Files are not usually good for hot forging with a hammer though. The file manufacturers add a a bit of sulfur to their steel to let it machine easier when cutting the teeth, but the sulfur makes steel crack if you hammer it when it is red hot.

author
chuckr44 (author)Jester2009-01-29

Making a knife involves several steps and certain tools are required. You would need a grinder (bench mounted is best for stability) to grind the rough shape and edge. As a period-accurate blacksmith I don't know what tools you would have access to to remove material. But that's the idea, remove some material. And it is not necessary to remove all the file "ridges" in order to make a good knife. Just remove the file's ridges near the cutting edge using a grinder or sandpaper or dremel perhaps.

author
scafool (author)2008-12-06

Back in the 1970s the Hudson's Bay store in Fort McMurray (northern Alberta)still sold the blades for them. You could buy right or left hand blades. The blade had all of the bevel on the top side of the edge and you only sharpened it from the bevel side, kind of like a chisel that way. They were meant to be used with the tip pointing up and pulled toward you like a draw knife. I never did like the idea of cutting toward myself. It seems like a dangerous move, but they limited the pull by keeping their elbows in front of their body as they pulled. That way if the blade slipped you just hit yourself in the belly (or thigh)with your elbow instead of slashing yourself open like a gutted fish. That was only for the cuts that had to be straight towards you. I found a lot of the cutting could be at right angles in front off you, with the knife held what most people would thik of as upside down. This means the tip pointing down, working on the underside of the piece and with the blade pointed out and your thumb pointing at your chest, working sideways away from you instead of pulling towards yourself. They were meant to take thin shavings off the work piece on each pass, like a plane does. They were also a much more flexible and springy knife than the hoof knives and were not designed to take as heavy of a cut.

author
chuckr44 (author)scafool2009-01-29

You are correct. But beginners, especially, should never draw a knife towards themselves. Even experienced wood carvers who use knives on smaller pieces, always wear leather gloves on both hands.

author
ewilhelm (author)2008-12-16

This project was mentioned in Popular Mechanics's 10 DIY Gifts for Friends and Family.

author
999592 (author)2008-12-16

THANK YOU! I love these knifes and have been wondering how to make one for quite some time now. Merci!

author
Bisquick the ninja (author)2008-12-16

Pretty sweet!!

author
dakellymon (author)2008-12-06

Nice crook knives. I found that small "Knife" files were the easiest to work with when making your own. "Warren Tool" has nice high carbon steel crook knives, they call them "Bent knives" as they already had a "crook knife" I guess. It's nice to have both right and left bent blades when carving as they both attack the grain of the wood differently. I found that a longer 12 to 14" handle worked well affording some leverage when using it as a gouge, which is where these knives really come in handy. Warren tool also carries the "Tormek" sharpening machines, considered to be the best by many carvers, " A dull tool is the wrong tool" as well as lots of other great carving tools.

author
Hoopajoo (author)2008-12-05

Cool! I've been wanting one of these for quite some time. The ones I've made haven't been all that great.

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Bio: Tim Anderson is the author of the "Heirloom Technology" column in Make Magazine. He is co-founder of www.zcorp.com, manufacturers of "3D Printer" output ... More »
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