Introduction: There are many passionate craftsmen, or fans of steel bars and wooden bars, who like to DIY some small tools. Of course, there is a lot of fun in this process, and at the same time, I feel full of pride after completing a DIY finished product. Xiaotu knows that there are many knife enthusiasts hidden here, and also knows that there are many beginners who don’t know how to get started or what to do. Therefore, we have specially compiled the tutorials and precautions for making knives with hacksaw blades!

The DIY process of making knives with hacksaw blades

1. Tool preparation

1. Electric tools

Grinder

The grinder is cheap and is the first choice for concave grinding. It can also be used to open false edges and small surfaces that are not too large. It is also mainly used for grinding and polishing.

Advantages: cheap price, small space occupation, many functions

Disadvantages: unsafe, no high-grit abrasive (actually there is, but it is expensive, it is an emery wheel)

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Purpose: Concave grinding/grinding/polishing

Belt sanding machine

Belt sanding machine is relatively expensive and is the machine of choice for surface grinding. It can also be used for simple concave grinding, generally not for shape grinding, but for polishing

Advantages: strong surface grinding ability, various mesh number abrasive belts, relatively high safety

Usage: surface grinding/V-shape grinding/polishing

　2. Electric drills

Drill

Advantages: Easy to drill

Disadvantages: Large size, heavy weight, high price

Hand drill

Advantages: Small size , light weight, low price

Disadvantages: high drilling skills required

Uses: drilling handle holes/blade holes/handguard holes/sheath holes, etc.

3. Non-electric tools

Diamond cutter

Uses: shaping, rough grinding, hand guard hole expansion, etc.

Whetstone

Uses: surface treatment, polishing, sharpening

Hand saw

Uses: sawing steel/handle material, etc.

Paint pen

Purpose: drawing shapes on the blank

2. Blade material

The back material of the blade is generally spring steel, and the tooth tip is generally M42 (W2Mo10Cr4Co8). You can perform a simple heat treatment yourself. Suitable for use as a pocket knife.

3. Handle material selection

Wood type

The wood is old wood, which is dense in quality, fine in fiber, not easy to deform, waterproof, feels good, and has good patterns. The ones are superior. Common ones include: mahogany, ash, ebony, ebony, rosewood, cherry wood, etc.

Solid wood flooring is not a good choice.

Horny type

Red deer antlers are high-quality materials with many advantages: non-deformation, waterproof, dense texture, beautiful, etc. The disadvantage is that it is expensive and difficult to buy.

The ram’s horn is also made of high-quality material, but the disadvantage is that it is not thick enough.

The horns are of medium quality. The horns are not thick enough to make a small straight knife handle.

IV. DIY Crafts

1. First, grind the shape

There are three ways to get out the knife blank

①Forging: If you can Once you've forged it, don't look at the other two methods.

②Wire cutting: Take the drawing or CAD drawing to the wire cutting processing place to cut out the knife blank

③Shape grinding: Use a paint pen to draw the knife shape on the blade, and then Use the grinding wheel of a grinding machine to grind the outer circle into a large shape, and then use an electric grinder to correct the fine corners.

It is recommended to use a grinder for grinding. If you insist on using a belt sander, I have no choice. Just do it slowly. It is best to use a 46# grinding wheel. You can quickly sharpen a knife to a large shape. If high-speed steel is used, the grinding wheel should be made of boron carbide or white corundum. Maximum grinding efficiency and minimum dust.

When using electric grinding to modify shapes, it is recommended to use a white corundum electric grinding head. The emery wheel head is not easy to use, it is easy to remove the abrasive, and it is very expensive!

　2. Feng Steel How to punch a hole with a saw blade

Wrap the part to be punched with transparent tape, and then use a knife to carefully dig out a round hole in the tape where you plan to punch the hole. Be careful to make it slightly smaller than the actual hole needed. Small. Both sides of the saw blade must be dug and must be symmetrical.

Then prepare a DC power supply (12V), connect the positive stage to the blade, and place it in a plastic container filled with salt water. The negative stage is also placed inside, but do not contact the blade. Do not allow any parts of the blade not protected by tape to come into contact with salt water. When the power is turned on, the blade will slowly be corroded and holes will appear (it will take about 3 or 4 hours).

　3. Surface treatment

Surface treatment includes the edge of the knife and the surface of the knife. The incision after wire cutting has an irregular rough surface and needs to be polished. There are also scratches on the surface of the steel, which also need to be polished off. The steps for surface treatment are:

If it is a sharp steel saw blade: first use a gold steel surface file to correct it, then use a 150-300 mesh whetstone to push and grind with both hands, and then use a 600-800 mesh whetstone to grind. The surface must be polished at each step before grinding in the next step.

Surface treatment can be carried out quickly using various methods. If diamond surface files are not used, the time will be doubled.

The knife base should be very bright after grinding it with a 600-grit whetstone. Other steel materials that have not been heat treated can also be ground using this method, but the process of diamond surface grinding is not required.

The next step is to apply a high-mesh abrasive belt on the belt sander or a cloth wheel on the grinder with about 400 mesh abrasive paste for fine polishing. This step needs to be done patiently and slowly. It can be very bright after polishing, remove the small convex surfaces on the surface, and reduce the conditions for water vapor deposition.

This step can also be carried out in the fine grinding stage after the blade is opened.

If you have the patience, I support grinding for 10 passes, but it is a waste of time.

Forged surface is the best surface treatment. What comes out after this process is satin. If you add finer oilstone and abrasive paste, you can get a mirrored surface. But the mirror has too many shortcomings.

4. Kai Feng

This is the most important technology. The experience and skills cannot be expressed in words. If possible, I will open a special thread to discuss it and talk about some principles here. Of course, if you're diligent enough, you can try it out yourself.

The techniques used for concave grinding, V-shaped grinding and flat grinding are the same and there is no difference. Take concave grinding as an example:

The concave surface is ground on the outer circle of the grinding wheel.

First grind out a slope of about 45 degrees at the blade edge

Grind continuously to connect the segmented small slopes

Even the slopes You need to grind it carefully and carefully. The feel is "press the small plane on the outer circle of the grinding wheel and drag the blade smoothly with both hands", and you can get a flat and straight edge. Please understand this carefully, it is the most important thing. .

For the other front side, use the grinding wheel on the other side of the grinder, swapping the left and right hands.

When encountering an arc at the tip of the tool, grind along the arc so that the arc is perpendicular to the cut surface of the grinding wheel circle. The technique is consistent and complete in one go.

If the front line is not straight, you can repeatedly correct it until there is no problem.

The last pass must be repeated continuously so that the front style is unified.

After the last few times of cutting, after the front line is basically completed, grind it gently after it is basically straight, so that even the 46# grinding wheel will grind out a bright front surface. You must know that brightness is not only beautiful, but also a prerequisite for rust prevention.

　5. False edge

The false edge on the belt sander is no different from the general flat surface technique. Just pay attention to the contact surface.

It is necessary to use the surface grinding of the grinding wheel on the grinder. Generally, the false edge part of the blade is placed close to the plane of the grinding wheel. The blade and the grinding wheel are at a 45-degree angle (generally speaking, the angle can be trimmed). Connect the contact surface and slowly put it up. Keep your hand steady, and it will come out soon.

　6. Tooth blade

Use a grinder to open the tooth edge. Use a grinding wheel with a thickness of 5. Use a diamond grinding pen to trim the outer circle into a semicircle to open the tooth edge. But I strongly disapprove of these methods, because a 5MM thick grinding wheel is very dangerous. So don’t try it, just do a technical discussion.

Another effective method is to use an electric grinder. Use two cutting blades, one thick and one thin, to open the toothed edge. The method is to fix the knife in a vise and use a hand-held electric grinder to cut the teeth.

7. Blade cutting

When cutting the blade, you can cut it directly on the belt sander or directly on the grinder, but the technique is difficult to master and it is easy to overdo it. Therefore, I recommend two methods:

① Manually open with a diamond file: Fix the knife vertically on a vise, hold the gold file with both hands and press it on the blade at an angle of 30-40 degrees, and follow the By pushing the blade back and forth, you can create a very beautiful blade. Same on both sides.

② Use an electric grinder with a white corundum grinding head: Fix the knife as above, hold the electric grinder with both hands at an angle of 30-40 degrees, and gently push the knife edge along the direction. Because the electric grinder rotates at 30,000 rpm, it is best to touch the blade lightly to avoid overdoing it.

There are also methods such as using a fixed-angle knife sharpener, so I won’t go into details.

8. Fine grinding

The so-called fine grinding is to polish the newly opened front. Because in the Kaifeng section, I have asked for light grinding for the last few times, and the result is already bright enough. In this step, I need to use a step wheel and abrasive paste or a high-grit abrasive belt for polishing to remove the small contact surfaces and reduce the friction. Small water vapor absorption area.

Apply abrasive paste (white or green) on the step wheel and polish it in the same way as sharpening until it is polished. Polish all parts of the knife except the handle to prevent rust.

This method will not damage the edge line and striker line.

9. Handle making

Generally, knife handles include full-cover type, patch type, through-handle keel, and through-heart handle. Based on the actual object, you can guess the approximate connection method.

Mainly talk about some of the main easily overlooked techniques in the wooden handle processing process.

After the wooden handle is finished, it is best to soak it in wax, fry it, dip it in ammonia solution, wax it, etc. It can be waterproof, insect-proof and deformation-proof. For old wood, you can just use a step wheel dipped in oil and throw it. It can be brightened or oiled at high temperatures.

Precautions

I think the most important thing is safety. Everyone is here to have fun. If it is not safe, it will be bad.

A grinder is an extremely dangerous power tool. Please note when using:

1. People cannot stand on the circular radiating surface of the grinding wheel.

2. The grinding wheel must not be used if it has cracks.

3. When the machine is newly turned on, people must stay away from it for a period of time and wait until the operation is stable before using the grinder.

4. When loading materials, be sure not to contact the grinding wheel violently, and load materials slowly.

5. The protective cover of the grinder must be installed and installed.

6. If you hear any abnormal noise, you must stop the machine immediately.

7. The grinding wheel must be shut down for half an hour after using it for half an hour to one hour.

8. If possible, all use emery wheels. Although it is very expensive, it improves the safety factor.

After reading such a detailed tutorial and precautions for making a knife with a hacksaw blade, are you eager to make a majestic knife yourself? To all you knife enthusiasts and all you macho men who like DIY, don’t hesitate any longer. After reading the tutorial, why not hurry up and prepare the tools, understand the tutorial, and follow the step-by-step instructions above to polish a knife of your own.

Let’s enjoy the fun of DIY together!

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