Regardless of the tool used in the work, it is always subject to wear, but in some cases temporary restoration is possible. So sharpening a circular saw with your own hands is a natural process that anyone can perform.
Circular sharpening scheme.
The disk itself is made of very durable alloys 50HFA, 9HF and 65G, and foreign companies use their versions with similar properties. The material has a high reliability and rigidity, so that incidents occur very rarely.
But the working part (cutting plates) is usually made on the basis of tungsten, carbide and cobalt, due to which it turns out to achieve high strength properties. The characteristics of the alloys are formed at the initial stage, since they depend not only on the proportion, but also on the granularity of the carbide phase (as the granularity decreases, the strength increases).
The cutting plates are soldered to the disk by means of high temperatures, and silver (optimally) or copper-zinc (worse) is used as the solder. The copper-zinc variant is ideal for seasonal homework, while higher-quality silver counterparts are needed for power-saw benches and professional workshops.
Now we need to carefully consider 1 tooth of the circular saw (Fig. 1). Very unusual will be the fact that there are 4 work areas:
Figure 1. Diagram of the circular saw tooth device.
These zones intersect with each other, thus forming 3 cutting edges:
It is thanks to such a complex system that a high-quality cut occurs without errors and nuances. In addition, there are 4 more types of such teeth:
The main wear occurs at the upper cutting edge and the front face, therefore, the main sharpening activity is directed to them. But do not forget about the side faces, because when working with massive workpieces, they also get their considerable load.
When working, do not allow a bluntness of more than 0.2 mm, because otherwise the sharpening will take much more time and effort. This factor is determined visually by cutting or by the tooth itself.
Types of saw blade teeth.
The sharpening of the tooth should be done in 2 planes - front and rear, which will significantly prolong the life. Sharpening only the front end will shorten these periods at least 2 times. Before starting work, the metal is cleaned of all third-party materials, and then degreased.
Only 2 types of wheels are used for work:
When sharpening, the tooth is ideally butted to the working surface, otherwise you can lose the entire disk, or not achieve the desired result. Due to the fact that each disc takes a considerable amount of time, you need to mark the starting point with a marker.
Special machines are equipped with everything necessary to ensure comfortable operation, so it’s almost impossible to make a mistake on them, while in artisanal conditions you will have to show some ingenuity. The following tools and materials are required:
To begin with, you will need a small electric motor, which is qualitatively fixed to the surface at a height of 5 cm or higher. An adapter for grinding discs is put on the shaft, after which the basic design is ready.
But in the hands it is inconvenient to hold the objects being sharpened, therefore for them 3 cm below the shaft another 1 plane of sheet steel is formed at a distance of 2 cm. It makes 3 longitudinal cuts with a step of 1 cm and a diameter of 0.3 cm in which the fixing screws will be screwed.
As a panel for fixing, you can think of a lot of things, up to a frame made of reinforcement for each individual diameter. The result is important - strictly perpendicular position, which allows you to influence the entire edge operated.
The sharpening of the teeth on a chainsaw and on a hacksaw is done in a similar way, but in the latter case, you can use grinding stones, because the material is very malleable, and a small error as a result will give a very subtle effect. When sharpening such saws, another complication often arises - the teeth are unbent, which makes the operation much more difficult in the future.
Despite the many nuances, sharpening of circular saws is quite simple and fast. It is important to carry out this process with great precision, so that it will be possible to achieve the final result in the shortest possible time.
In the absence of a professional tool for sharpening a saw at hand, you can build it from scrap materials.
For complete assembly, it usually takes up to 3 hours, and the service life is limited only by the capabilities of the electric motor itself.
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