Homemade knives from an ordinary saw

The stores feature a large number of knives. They have a different design, purpose, performed using modern technologies. In addition, materials for the production can be not only metal, but also the special rigidity of ceramics. These knives are very sharp, do not need sharpening for a long time, but they are quite fragile. When a split is formed, it is not possible to restore the old look to the knife, especially at home.

Knife made from saw

The blades of the knife must be made of hardened steel to make it convenient to use.

In order to work with a knife and at the same time comfortably cut, it should sit securely and comfortably in your hand. With a comfortable grip it can be used for a long time. But it is not always possible to find such a knife in the finished form. Then you can do it yourself. This takes into account the features of the palm, the length and shape of the cutting blade. Knives should be made of hardened steel. Therefore, homemade knives from the saw will fully meet the requirements.

Knife making options

Self-made knives can be made from a variety of metal parts, which cannot be used for their intended purpose, since they have become unusable.

Knife Handles

Forms of knife handles.

Among the parts from which you can make homemade knives, there are several:

  • worn motorcycle connecting rods, from which you can make a set of knives of various lengths;
  • wheel wrenches with 1 broken end;
  • crutches that are used when laying rails;
  • disks of a circular saw of various diameter and thickness;
  • damaged hacksaw blade of the pendulum saw.

With certain skills in forging, you can make a knife from a metal thick cable, a chain from a household unit. To do this, the chainsaw is best suited. Her chain is strong enough, and a homemade knife will turn out like Damascus knives.

If the circular saw has a large disc diameter, and its damage is minimal, then it can turn out two improvised knives. The discs have significant strength metal manufacturing, as the saw is used for various purposes for a long time.

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Materials and tools

To make a homemade knife, you need the following equipment:

Graph of knife thickness versus steel hardness

Graph of knife thickness versus steel hardness.

  1. Woodworking Machine. If not, then you can use an electric jigsaw to pre-saw out the handle. For the final grinding apply sandpaper of different grit.
  2. Nails or better copper wire for rivets.
  3. Wood.
  4. Grinding and sharpening machine. In his absence, you can use the grinder, perforator, high power drill. In addition, nozzles or circles are needed with which these operations can be performed. One of these tools should be firmly fixed, and then perform the work.
  5. Files with different types of notches.
  6. Marker.
  7. Brass plate and rod, if the handle is not mounted on the rivets.
  8. Epoxy adhesive.

Knives should have a comfortable grip. For her, the most suitable material is wood. Most often used birch, oak bars. These rocks are the hardest, less susceptible to moisture with prolonged use. They are pleasant to the touch and have a beautiful texture. Since for the manufacture of the handle of the knife does not require a large amount of the source material, for this purpose you can use 1 floorboard, scrap board or bar. It is important that the wooden blank is not damaged, cracked and does not contain chips and other defects.

Hardening knife

After the blade is sufficiently calcined, you need to cool it.

In order to make a knife, you must use certain steel grades. It should be remembered that how its metal was technologically carried out depends on its characteristics. For example, with increasing hardness, the brittleness of metal products increases. Suitable for steel knife grades R6M5 or R3M3F2. In this case, the thickness of the metal in 2 mm will be enough.

The strength of the homemade knife does not depend on the thickness of the metal. It is influenced by its geometrical dimensions: length, width, shape of the blade and descent. With the right choice of these components and accurate metal processing, an excellent knife is guaranteed. Such steels are used in the manufacture of discs, canvases, tools such as, for example, a circular saw.

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Knife from a hacksaw blade

If it is decided to use a blade from a hacksaw as a metal blank, then it is necessary to take a blade from a pendulum saw. This saw performs heavy metal work (for example, rails) and meets the requirements of rigidity and strength. The size of such canvases varies within the length / width / thickness, 400-500: 30-40: 2 mm. The color is determined by the type of production treatment the saw has been subjected to, and may be black or gray.

Before starting the manufacture of a knife blade, you must check the integrity of the metal. This can be done by ear, but this requires a certain experience and skill. The whole canvas makes a ringing sound, the damaged - deaf. If it is difficult to do it by ear, then it is imperative to inspect the metal blank thoroughly.

On the whole piece of the canvas, the contour of the future knife is applied with a marker.

Diagram of the correct angle of sharpening the knife

The angle of the blade should be equal to 20 degrees.

At the same time it should be not only a blade, but also an allowance, which will then be hidden in the handle. After that, on a metalworking machine (or a carefully fixed grinder with a circle), it is necessary to gradually and carefully remove the excess.

This should be done slowly, as the metal can heat up. To cool it and continue to work, take a bucket of water. This container should be enough for the workpiece to be placed completely in the water. The same machine performs the contours of the blade. It should be borne in mind that the feature of this steel is that with a sharp change in the temperature of the metal in it can form the smallest cracks. This can lead to the fact that even with a small effort the knife breaks. Therefore, it is impossible to prevent overheating of the metal during its processing. Especially carefully it is necessary to carry out the tip, because with a decrease in thickness the metal heats up faster.

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Completion of the process: recommendations

After the main part of the metal is removed, it is necessary to align straight sections. This is done on the side of the circle. Especially in alignment needs a butt and cutting edge. The angle where the blade of the knife passes into its tail should not be 90 degrees. This will significantly weaken the entire structure.

A copper or brass rod of 4-6 mm is suitable as a rivet. The diameter of the rivet should be smaller than the holes in the shank.

The descents of the blade must have the same width and angle, and also converge at one point. This will make the knife sharp and easy to further sharpen. When performing descents, you must constantly cool the metal, stop and check the symmetry and accuracy. After that the blade is ground and polished.

On a wooden blank with a jigsaw perform cut and cut the contour of the handle. With the shank attached, mark the holes and drill them. The shank is coated with epoxy glue, inserted into the slot. Thread the rod through the holes, cut off the excess and rivet. The exposed glue must be removed before freezing. Grind the handle with sandpaper until the handle is smooth.

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