Let’s learn how to choose the right saw blade.

Sawing, planing, and drilling are things that I believe all readers come into contact with every day. When everyone buys a saw blade, they usually tell the seller what machine it is used for and what kind of wood board it is cutting! Then the merchant will select or recommend saw blades for us! Have you ever thought about why a certain product must use a certain specification of saw? . Now Eurocut will have a chat with you.

The saw blade is composed of a base body and saw teeth. In order to connect the saw teeth and the base body, high-frequency brazing is usually used. The base materials of saw blades mainly include 75Cr1, SKS51, 65Mn, 50Mn, etc. The tooth shapes of saw blades include left and right teeth, flat teeth, alternating teeth, trapezoidal teeth, high and low teeth, trapezoidal teeth, etc. Saw blades with different tooth shapes are suitable for different cutting objects and have different effects.

When selecting a saw blade, you need to consider factors such as the machine spindle speed, the thickness and material of the workpiece to be processed, the outer diameter of the saw blade and the hole diameter (shaft diameter). The cutting speed is calculated from the spindle rotation speed and the outer diameter of the quasi-matching saw blade, and is generally between 60-90 meters/second. The cutting speed of different materials is also different, such as 60-90 m/s for softwood, 50-70 m/s for hardwood, and 60-80 m/s for particleboard and plywood. If the cutting speed is too high or too low, it will affect the stability of the saw blade and the processing quality.

Let’s learn how to choose the right saw blade.

1. Saw blade diameter

The diameter of the saw blade is related to the equipment used and the thickness of the workpiece. If the diameter of the saw blade is small, the cutting speed will be relatively low; the larger the diameter of the saw blade, the higher the requirements for the saw blade and equipment, and the cutting efficiency will become higher.

2. Number of saw blade teeth

Generally speaking, the more teeth a saw blade has, the better its cutting performance will be. However, the more teeth it has, the longer the processing time will be, and the price of the saw blade will be relatively higher. If the saw teeth are too dense, the chip tolerance between the teeth will become smaller, and the saw blade will It is easy to heat up; if the feed rate is not matched properly, the cutting amount of each saw tooth will be small, which will intensify the friction between the cutting edge and the workpiece, resulting in a shorter service life of the saw blade; therefore, the appropriate number of teeth should be selected according to the thickness and material of the material. .

3. Saw blade thickness

Choose the appropriate saw blade thickness according to the cutting range. Some special-purpose materials also require specific thicknesses, such as grooved saw blades, scribing saw blades, etc.

4. Types of alloys Commonly used types of cemented carbide include tungsten-cobalt (code YG) and tungsten-titanium (code YT). Because tungsten-cobalt carbide has better impact resistance, it is widely used in the wood processing industry.

In addition, you also need to choose a suitable tooth shape. You can carefully observe the saw tooth shape. The main tooth shapes are: left and right teeth, flat teeth, alternating teeth, trapezoidal teeth, high and low teeth, trapezoidal teeth, etc. There are various other saw blades with different tooth shapes, and the objects suitable for the saw blade and the sawing effect are often different.

It is mostly used for trapezoidal teeth or tapered teeth. The plate is scored and grooved, and the shape of the teeth is conducive to weight loss. That is impossible, haha! The main trapezoidal teeth are used to avoid edge chipping when veneering panels!

The left and right teeth are more commonly used on multi-blade saws or cutting saws, but the number of teeth is not too dense. The dense teeth affect chip removal. With fewer teeth and larger teeth, the left and right teeth are also more conducive to longitudinal cutting of boards!

Like electric saws, sliding table saws, or reciprocating saw blades! The auxiliary saws mostly have trapezoidal teeth, and the main saws mostly have trapezoidal teeth! The trapezoidal teeth not only ensure processing quality, but also improve the efficiency of the saw to a certain extent! However, saw blade grinding is more complicated!

The denser the teeth, the smoother the cut surface of the sawn board will be, but the denser teeth are not conducive to cutting thicker boards! When sawing thick plates with dense teeth, it is easy to damage the saw blade because the chip removal volume is too small!

The teeth are sparse and large, which is more conducive to the processing of raw materials. The teeth are large and sparse, and the sawn boards will have saw marks. However, not many people use flat teeth nowadays. Most of them are helical teeth or left and right teeth, which can be avoided to a certain extent! Also good for saw blade grinding! Of course, there is one more thing to note! If you are cutting wood grain at an angle, it is recommended to use a multi-tooth saw blade. Using a saw blade with fewer teeth may be a safety hazard!

When using a saw blade, you will find that the saw blade not only has different sizes, but also the saw blades of the same size have more or less teeth. Why is it designed like this? Is more or fewer teeth better?

In fact, the number of saw teeth is related to whether the wood you want to cut is cross-cut or longitudinal. So-called longitudinal cutting is cutting along the direction of the wood grain, and cross-cutting is cutting at 90 degrees to the direction of the wood grain.

We can do an experiment and use a knife to cut wood. You will find that most of the cross-cut materials are particles, while longitudinal cuts are strips. Wood is essentially a fibrous tissue. It is reasonable to have such a result.

As for multi-tooth saw blades, at the same time, you can imagine the situation of cutting with multiple knives. The cutting is smooth. After cutting, observe the dense tooth marks on the cut surface. The saw edge is highly flat, and the speed is fast and it is easy to jam the saw (that is, the teeth are hairy). Black), sawdust excretion is slower than those with fewer teeth. Suitable for scenes with high cutting requirements. The cutting speed is appropriately slowed down and suitable for cross-cutting.

It has fewer saw teeth, but the cut surface is rougher, the distance between teeth marks is larger, and wood chips are removed quickly. It is suitable for rough processing of softwood and has a fast sawing speed. There are advantages to cutting longitudinally.

If you use a multi-tooth cross-cutting saw blade for longitudinal cutting, the large number of teeth will easily cause poor chip removal. If the saw is fast, it may jam the saw and clamp the saw. When clamping occurs, it is easy to cause danger.

For artificial boards such as plywood and MDF, the direction of the wood grain has been artificially changed after processing, and the characteristics of forward and reverse cutting are lost. Use a multi-tooth saw blade for cutting. Slow down and move smoothly. Use a saw blade with a small number of teeth, and the effect will be much worse.

If the wood grain is beveled, it is recommended to use a saw blade with more teeth. Using a saw blade with fewer teeth may cause safety hazards.

In summary, if you encounter the problem of how to choose a saw blade again in the future, you can make more oblique cuts and cross-cuts. Choose your sawing direction to decide what kind of saw blade to use. The saw blade has more teeth and fewer teeth. Choose according to the direction of the wood fiber. , choose more teeth for oblique cuts and cross cuts, choose fewer teeth for longitudinal cuts, and choose cross cuts for mixed wood grain structures.

For example, the pull-bar saw I bought online was cheap, but it came with a 40T saw blade, so I replaced it with a 120T saw blade. Because pull bar saws and miter saws are mostly used for cross cutting and bevel cutting, and some merchants provide saw blades with 40 teeth. Although the pull bar saw has good protection, its cutting habits are not ideal. After replacement, the sawing effect is comparable to that of big brands. Manufacturer.

Regardless of the tooth type of the saw blade, its quality still depends on the material of the base body, the arrangement of the alloy, the processing technology, the heat treatment of the base body, dynamic balancing treatment, stress treatment, welding technology, angle design, and sharpening accuracy.

Controlling the feed speed and saw blade feed speed can also extend the service life of the saw blade, which is very important. During the installation and disassembly process, you must pay attention to protecting the alloy head from damage. Some saws with precision requirements must be repaired in time when they cannot meet processing requirements.

How to choose a saw blade for cutting different materials? Carbide saw blades are used to cut aluminum, high-speed steel saw blades and cold saw blades are used to cut steel, carpentry alloy saw blades are used to cut wood, and acrylic special alloy saw blades are used to cut acrylic. So what kind of saw blade is used to cut composite color steel plates?

The materials we cut are different, and manufacturers often recommend different saw blade specifications, because of the steel plate material, alloy material, saw tooth shape, angle, processing technology, etc. The saw blade must comply with the material characteristics to be suitable. . Just like we put on shoes. Different feet match different shoes to achieve the desired effect.

For example, cutting composite color steel plate material, which is an insulation composite maintenance plate made of color-coated steel plates or other panels and bottom plates and insulation core materials through adhesive (or foaming). Because of its diverse composition, it cannot be cut with ordinary wood alloy sheets or steel cutting saw blades, and the result is often unsatisfactory cutting results. Therefore, it is necessary to use a special carbide saw blade for composite color steel plates. This kind of blade needs to be specific, so as to achieve twice the result with half the effort.