How to make a knife from a chainsaw bar

posted 5-1-2010 11:04

quote: Originally posted by boroda Kostroma:

Dude, by those standards the knife was really good

also tire was one of the available materials in the zones

We are not in those times and thank God we are not in the zone or in the logging area. Why should they suffer when in the current conditions there are quite a lot of good materials. It’s a pity, I don’t have the money for ready-made blade knives or I want to make something myself - yes please - how many different pieces of iron are on sale. Wrong again? Yes, take a plane blade - the polished, hardened strips are enough for a couple of knives and are better than any tires. and for money 300r.

A friend's meat cutting knife broke. After going shopping, my friend didn’t find anything suitable - either the price didn’t suit him, or the quality wasn’t very good. I suggested that he make a durable and reliable tool from an old Ural chainsaw blade, because it is a good, WEAR-RESISTANT material.

I drew the outline of the knife on the workpiece with chalk (see diagram)

, pressed it to the workbench with a clamp and cut the workpiece along the line with a grinder. Using sandpaper, I smoothed out the edges and smoothed out the sharp edges.

The lower part of the workpiece (blade) was sharpened into a wedge (photo 1)

, then cleaned all surfaces with sandpaper and polished with felt and GOI paste.

To avoid cutting myself when performing further work, I sealed the blade with masking tape in several layers. He heated the handle of the knife with a gas torch (to make the metal softer) and, when it cooled down, drilled three holes 6 mm in diameter (photo 2)

for attaching a wooden handle.

In a beech block of the required size, I cut a groove 4 mm wide and 22 mm deep on a circular saw. I drilled three holes in the wooden blank perpendicular to the groove so that they coincide with the holes on the metal shank.

I secured the block to the knife with rivets from a bronze tube d 6 mm. Using sandpaper, I gave the handle the desired shape, sanded the surface and soaked it in automobile oil (photo 3)

The friend was very pleased with this gift and after testing it at home, he said that this knife could handle anything.

The time comes, and the factory tire from an electric or chainsaw becomes unusable. But you can give it new life. For example, an old tire can become a good knife (cleaver) for household needs in a garage or country house.

To work you will need an old tire, a small wooden block, several metal pins, a band saw (or jigsaw), an angle grinder (grinder), a grinder, a drill, sandpaper, a rasp, drawing tools, impregnating oil, epoxy resin (or wood glue) and any varnish from a can.

We mark the future limit switch and the shape of the blade on the tire. Using an angle grinder, cut off all excess metal. After this, we mark the upper part of the blade according to the shape of a thin-toothed saw.

Main stages of work

On an emery wheel, the master sharpens the future product. For convenience, you can clamp the workpiece between two planks. Sharpening is done on one side of the blade. After rough sharpening, the master performs a more thorough sharpening on a stone.

Next we proceed to making the handle. Having previously drilled holes in the end piece, we attach it to the block and mark its shape. We complete the shape of the future handle. We saw through the block lengthwise to the depth of the end and to its thickness.

After this, we drill through holes. We insert the blade into the handle. We make holes in the workpiece and the handle. We insert the pins and rivet them on both sides on the anvil until the caps form.

The next step is to sand and shape the handle. Roughly define the shape of the butt of the handle, giving it the shape of a semicircle. We sand it with sandpaper and get the final shape.

Places where there are any holes left in the block can be filled with glue and covered with small shavings remaining after grinding. Cover with oil and varnish. The homemade knife is ready.

Source

Instructions for making a knife from a chain

In the package version of making a knife from a chain, the product is suitable for various mechanisms: a motorcycle, a car, a bicycle or a chainsaw.

Materials and tools

Having decided on the manufacturing method, you need to prepare the tools and materials:

an anvil, two hammers - large and small;
oven or forge;
vices, angle grinders with discs for various purposes;
Knife from a chain.
tetraboric acid (borax);
Hydraulic Press;
grinding machine;
welding machine, steel chain;
high carbon steel plate;
motor oil and a container of water;
drill, wooden block, epoxy glue;
masking tape, sandpaper of different grains;
Handle impregnation made from natural oils.

Tools and materials are professional in nature. From the very beginning it was stated that this was a job for experienced craftsmen. Beginners should not try this material. You need to start experimenting with simple preparations.

Forging blanks

A distinctive feature of the batch forging process is the work with several metal plates. Having everything you need, you need to start the initial forging of the blade:

Using a cutting wheel on an angle grinder, cut the chain into several pieces of equal length. Having folded them into a single form, using welding, we “grab” them to obtain a solid workpiece.
A rod is welded to the resulting rectangle for ease of holding. Having warmed up the oven, place the workpiece in it and heat it to 1100-1200 °C.
Once the metal has reached a bright red hue, remove it and sprinkle it generously with borax. This will allow you to more reliably fasten the pieces of the chain together and get rid of voids in the links. Place in the oven for further heating.
We take it out again, sprinkle it with borax and quickly move to the press. With its help, we gradually compress the workpiece from all sides. We monitor the temperature; when the part has cooled down, go back into the oven. The process performed by the press will help get rid of voids in the workpiece and forge weld it into a monolith.
After making sure that the welding is sufficient, use a large hammer to flatten the workpiece into one plate. Cool the product in air, cut off the rod using an angle grinder. And with the same tool we halve the plate.
Between the resulting halves we lay carbon steel, sprinkling the layers with brown. We carefully “grab” it with welding and return the rod to its place. Place in the oven and heat until bright red. Having taken out the plates, we forge them with a large hammer. The plates must be welded together using the forging method.

Knives from a chainsaw chain.
Then we forge the workpiece like ordinary knife steel. This method will provide excellent cutting properties of the blade.

Damascus steel uses a multi-layer forging method, thanks to which unique patterns are formed on the blade. In the described case, they will appear due to the structure of the chain.

Blade Shaping

Thanks to forge welding, the resulting package must be forged like ordinary knife steel. We heat the workpiece, forge the slopes and rise of the blade to the nose.

The inner plate will come out into the cutting edge, which is what was required. The final stages are:

After the workpiece has cooled, the rod should be cut off. Holding it in a vice, use a grinder to mark and cut out the shank. The part is ready for processing on the grinding machine. We bring bevels along the entire length of the blade to the finishing stage - the article will help: “how to make bevels on a knife.”
Using a grinding machine, you should go over the entire surface of the product - removing carbon deposits. It is necessary to make a cutting edge and pre-sharpen the knife.
The process of hardening the product is required. Professionals advise doing it in oil and water. Having heated the blade to 800-900 °C, it is completely immersed in oil for 2-3 seconds, removed and dipped in water for a couple of seconds. The product will acquire the necessary hardness and will be able to withstand heavy loads.
The blade requires tempering in an oven at a temperature of 200 °C for 2 hours. Let it cool naturally. At the end of the process, you need to go over the entire blade with fine sandpaper.
We draw the cutting edge depending on the further purpose of the blade. And we sharpen it, a useful article on the topic: “how to properly sharpen knives on a machine.” To develop a chain pattern, it is necessary to etch the knife in a 5% ferric chloride solution for 20 minutes.

If we make a wooden handle

All that remains is to mount the handle. The article: “how to make a handle for a knife” will come in handy. In this case, the choice fell on the mounted type:

A hole is drilled in a wooden block in accordance with the shank.
Wrap the blade with masking tape for safety.
You can easily do without a wooden handle.
Epoxy glue is mixed, poured into the hole made, and the blade is inserted with its tail.
We leave the product to dry for a day.
Then we process the handle on a grinding machine to the desired shape,
We saturate it with special oils.
Polishing the handle.

Finishing

We polish the blade until it shines. The knife from the chain is ready.

“Mythbusters” or whether it’s worth making a knife from a chainsaw bar.

display of information is limited

I have repeatedly come across references to knives made from chainsaw tires on the Hansa and here on the forum. But there is not a single picture or details of the process itself. So I decided to try it myself, like this mini “mythbusters” in Vinnytsia.

“There is no harp - take a tambourine!” (With)

I mean, I didn’t have a calm in my bins, nor this saw with the letter “X...”. And I found an old tire from a “Partner 370” saw, seemingly made in Sweden, bought about 10 years ago. After so many years of diligent use, the edge along which the chain runs has worn off. Moreover, it was ground asymmetrically, which is why the chain fell off every 10-15 minutes. I was somehow too lazy to edit, so I bought a new tire and “took this one to the clinic for experiments” (c)

It looks something like this:

“Mythbusters” or whether it’s worth making a knife from a chainsaw bar.

Sorry for the quality of the photo - I took it on my phone...

There are some letters and numbers on the side surface - presumably the model number, they have nothing to do with the metal. But suddenly?

“Mythbusters” or whether it’s worth making a knife from a chainsaw bar.

After a test cleaning of the surface with a brush, the following traces were found:

“Mythbusters” or whether it’s worth making a knife from a chainsaw bar.

From which the conclusion was drawn - it was riveted “tightly” on the core.

In about 10 minutes, using a screwdriver and some kind of mother, the tire was opened. The autopsy showed that the patient died from the autopsy and that the tire was indeed composite and riveted, it looks like this:

“Mythbusters” or whether it’s worth making a knife from a chainsaw bar.

notices that the holes are punched almost right through.

“Mythbusters” or whether it’s worth making a knife from a chainsaw bar.

I don’t know what kind of “liver” is in the tires of a calm or saw with the letter “x”, but I suspect that in essence it’s about the same.

When measured with a caliper, the thickness of the middle insert is 1.5 mm, the side pads are 1.3-1.4 mm.

The first thought was “SO THIN, WHAT, WHAT.”

Then the voice of common sense advised not to get excited and compare it with the knives available. I came across a simple non-name kitchen appliance, bought 2 years ago for 12 UAH, of surprisingly decent quality stainless steel. It holds an edge for a long time, I adjust it about once every six months. Once I even cut myself so badly that I had to stitch my finger.

Well, it doesn’t matter, I got distracted... So - its thickness is 1.2 mm at the butt. That is, not everything is so hopeless.

I compared the hardness of steel with the same knife. The middle insert is very soft; a knife with the butt of it easily removed shavings from it. And the side pads turned out to be approximately equal in hardness to it, maybe even 1-2 units harder. Good too

“Mythbusters” or whether it’s worth making a knife from a chainsaw bar.

Using a file, the middle pad was just like butter, and the side ones rubbed at about the level of kitchen stainless steel (I once smoothed a knife at home, the sensations were about the same).

In general, I put aside the middle tab, and cut off such a piece from the side

“Mythbusters” or whether it’s worth making a knife from a chainsaw bar.

and took it home to think and draw. You probably need to make something thin to fit between the holes. I’ve been wanting a small filet for a long time – I’ll probably make it...

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Selecting material for forging a knife

In machines and devices for various purposes, chains are used to transmit mechanical forces to related units. She bears a lot of physical stress. which a chain made of durable alloys can withstand.

A blade made of this metal will amaze not only with the beauty of its design, but also with its practicality.

The manufacturing process is not easy, you need to be patient. Metal forging experience is also required. Bicycle or car chains have different metal compositions. Depends on the load experienced by the “donor” used.

Professional knife makers advise using a high-alloy plate between two chain plates. A kind of “sandwich” is welded by forge welding, and a package of metals will result in excellent cutting qualities and the aesthetic appeal of the product.

Trick: welding a cutting edge made of knife steel to a chain blank will upset the blacksmith in the final form and reliability of the blade. The package option is definitely preferable. This will be discussed in this article.