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Essential Knowledge of Circular Saw Blades (Part 2)

Aug. 22 , 2020

■Number of teeth

Except for grinding saws used for cutting ferrous metals, glass, and ceramic tiles, all circular saw blades have many teeth scattered on the circumference. The number of teeth on the saw blade is one of the most obvious characteristics of the intended use of the saw blade, and it is also one of the biggest issues to consider when choosing a saw blade. It is usually the first parameter that should be considered when buying a saw blade. This quantity will describe whether it is designed for longitudinal or transverse cutting, wood or masonry, thick or thin materials. There are two extreme types: saw blades with fewer but larger teeth, with larger spacing between each tooth, used for longitudinal cutting; and saw blades with many small teeth, used for cross-cutting.

Saw blades designed for slitting generally have fewer teeth. They are designed to take a larger piece of sawdust from the wood or "bite" it, cutting faster. Since slitting is easier than cross-cutting, having a saw blade that can cut larger chips can improve efficiency without sacrificing cutting quality. In order to adapt to this rapid cutting, according to the size and quality of the saw blade, the number of saw teeth of the longitudinal cutting saw blade will be less than 40, more than 18 teeth, and there are large tooth grooves between. On the other hand, when saw blades are used for cross-cutting, they need to cut the grain of the wood so that they are smaller bites and produce smaller chips.. This requires more serrations instead of large cogging. The cross-cut saw blade has 60 to 150 teeth. The more teeth the saw blade has, the smoother the cut. Hollow ground or plywood saw blades have roughly the same number of teeth, but please note that the performance of these saw blades is significantly different from what is considered a combination/multipurpose saw blade. Combination saw blades are between these two numbers, ranging from 40 to 80 teeth. These saw blades are a compromise solution designed to allow the same blade to be used for longitudinal and cross-cutting.

For most woodworkers, the number of teeth of the saw blade is the most important part when choosing a saw blade. Generally speaking, a higher number of teeth indicates a higher quality of the saw blade, because each tooth added to the saw blade increases the cost of the saw blade. This is especially true for carbide saw blades. However, just the number of sawteeth is not enough. The best way to find a saw blade that suits your needs is to cut 25.4mm thick wood at any height.

Circular Saw Blades

Circular Saw Blades


The tooth groove is the circular space in the saw blade base plate between the saw teeth. This space is designed to take away debris such as sawdust and wood chips. Prevent the saw blade from clogging. The size of the tooth groove on the saw blade is closely related to the feed speed factor. The cross-cut saw blade has more teeth, so the tooth groove is smaller, and the heavy-duty saw blade and the longitudinal saw blade have a larger tooth space between each tooth, which can quickly remove wood chips. The tooth groove must be used to prevent the saw blade from overheating and the material being cut from burning. If there is not a large enough gullet, the sawdust will be trapped, stick to the saw blade, and increase friction, thereby generating excess heat. Since wood chips burn more easily than solid wood, it is actually possible (though not common) to catch fire in this way. If there is enough overheating, the saw blade will begin to warp, which increases the thickness of the saw path and eventually damages the saw blade. Therefore, it is not recommended to try to use a cross-cut saw blade for longitudinal cutting. The tooth grooves on the cross-cutting saw blade are small, and the more frequent saw teeth are accompanied by smaller teeth, and the ability of the saw teeth is not enough to transport a large number of chips and wood chips. The cutting speed of the cross-cut saw blade is slow, and there is enough time to discharge the waste, so there is no need for large tooth grooves. But forcing the wood to pass through the saw blade can also block up due to the accumulation of sawdust and sawdust.

Combination saw blades can be used for longitudinal and transverse cutting. When used for slitting, the saw blade will accumulate too much sawdust in the saw gap. Some combined saw blades solve the problem of chip accumulation by skipping teeth and adding an extra deep tooth groove after every five teeth. The deep tooth grooves between the sawtooth profile groups can provide a place for excess sawdust to be removed from the saw grooves, thereby eliminating overheating problems.

Compared with hardwoods, softwoods tend to produce larger, looser piles of wood chips. Therefore, for cork, the problem of wood chips accumulating in the tooth grooves will be more serious. If you are cutting damp wood, the problem will increase because the dampness of the wood will cause the wood chips to clump together instead of falling off the teeth. As the saw blade becomes more and more clogged, the temperature will rise, which can only be noticed when the table saw begins to deform or the saw blade begins to bend. The reason for the opposite situation is the obvious error, which is less likely to occur: when the slitting saw blade is incorrectly used for cross-cutting, the serrations caused by the slitting saw blade are not neatly handled, a lot of waste, and a lot of waste and large Block of sawdust, which prevents people from using it. Although the grade of the saw blade is not determined by the size of its tooth groove, it is easy to see when inspecting the saw blade. Saw blade designers consider the intended use of the saw blade and ensure that they provide sufficient tooth spaces for the intended use. When the saw blade is used outside of its intended purpose, especially when the cross-cutting blade is used for slitting, the tooth space may be insufficient.

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