The use of disk elements has found distribution in many areas of industry, therefore, a machine for sharpening circular saws has become very widespread. The main requirement for such an instrument is high quality cutting of materials. Sharpening is not such an easy task as it might seem at first glance. In this case, you can not do without special equipment. The following indicators influence how complex the operation will be:
- what material the element is made of;
- the size of the diameter of the saw;
- the angle of inclination and the shape of the tooth.
Machine
A machine for sharpening circular saws is not just one device. So you can call a large group of equipment and tools for special purposes.
According to the method of production, they are divided into two groups:
- Automatic. The whole process of sharpening is fully mechanized and there is no need for human involvement. Such devices are used for production purposes.
- Tame. It can be any devices and tools for sharpening by manual method. The performance of such equipment is much lower than automatic machines. This type has found application in handicraft workshops for domestic needs.
Equipment of this kind in a wide assortment is on sale, devices can differ in functions, power and price. A manual machine for sharpening circular saws, the price of which will be significantly lower (about 20 thousand rubles), can be made independently. The equipment consists of a dense and hard alloy plates that serve as cutters.
Plates for them are made of alloys of various compositions.
They have different tooth configurations. Strength will depend on which alloy is used. Not the last role is played by the grain size of the alloy. It should be less to give strength and hardness to the product. Typically, such hard alloys are obtained from
tungsten carbide cemented with cobalt. Therefore, it is so important that the equipment was precisely the machine for sharpening carbide saw blades.
Differences in the teeth of the plates
The hard alloy tooth has four main planes for work: front, back and side (auxiliary). When the planes intersect with each other, cutting edges are formed: the main and the pair of auxiliary.
The shape of the teeth is as follows:
- Direct. The use of this form will be justified when a longitudinal cut is required fast in time and not required in quality.
- Slanting or beveled. The angle of inclination of the rear form in this case can be right or left, they alternate with each other. This configuration is most common. Sharpeners of various sizes are used to work with different materials in any direction.
By changing the size of the bevel angle in the direction of increase, you can strengthen the cutting and reduce the likelihood of chipping, but this will lead to a decrease in the strength and resistance of the tooth itself. Possible tilt and front of the plane of the element.
- Trapezoid. This tooth has a slower blunting edge than a beveled tooth. Alternate it with direct. At the same time, the rough cut occurred with a longer trapezoidal, and the final cut with a short straight one.
- Conical. This form of teeth performs a rough cut of the lower edge of the boards, while the upper is protected from chips. Basically, the front face of such an element is flat. But if you make it concave, then it is possible to use this unit for cross cutting in the final version.
Sharpening angles
The main angles are those determined by the shape of the teeth. This is the front and rear, as well as a bevel along the front and rear planes.
For the longitudinal cut of the front corner, it is recommended to set the degree in the range from 15 to 25. For the transverse - 5-10 degrees. For universal saws of both sections, it is more correct to choose an average value equal to 15 degrees.
The angle size is also determined by the hardness of the cut material.
With high hardness, it is made smaller. Front cutting angle is possible in negative execution. This is used in non-ferrous metals and plastics.
Prices
You can buy a machine for sharpening carbide saw blades at a cost of 15,000 rubles. You can fork out for more expensive devices. For example, PP-480Z will cost its owner 280,000 rubles. Prices vary and depend on the purpose of the device, its functions, power and performance. For a small workshop or home use, you can purchase a JMY8-70 circular saw sharpener. Its cost is in the range of 18,000 rubles.
Sharpening rules
The main wear of the teeth of the saw occurs on the upper edge, which is directly involved in cutting. Its rounding may be 0.3 mm. The central face changes earlier than the others.
- Do not allow saw wear to be significant. The edge can be rounded no higher than 0.2 mm. Sharpening a saw blunted more than this value is harder. This will take longer than for a tool with normal wear. The degree of wear is determined either by the type of cut, or by the teeth.
- We must not forget about how much sharpening is possible. This value is between 30-35 times. To achieve this result, both surfaces are treated at once.
The machine for sharpening circular saws allows you to perform work in only one plane. And then it will decrease by about 2 times.
- Before starting work, clean the working disk from dirt and measure the inclination angles. Sharpening is done from the front of the tooth. The metal layer that can be removed is 0.20 mm.
- If abrasive diamond wheels are used for sharpening , then they need to be cooled with a liquid of a special composition (coolant). For the best quality and reduction in specific gravity, it is better to choose a circle of high grit.
- Notches and bumps should not be allowed even if it is a home-made machine for sharpening circular saws. They can lead to untimely exit from work and crumbling of metal.
Handicraft
Sharpening yourself is not a big deal. Especially if you need equipment. And if not, then you can make it yourself. You can make a machine for sharpening circular saws, the price of which will only please you, from simple parts. To do this, you need the following basic elements:
- engine;
- support;
- tilt mechanism;
- stop screws.
The circle is fixed on the engine, the disk blade on the support, the screws will ensure the movement of the workpiece along the axis of the circle, which will provide the desired angle.
The main task for such an element as a machine for sharpening circular saws is to fix them in the required position relative to the circle. This is necessary for accurate observance of angles, this can be achieved by a stand mounted on the frame of the machine in the same plane with the circle.
When placing the disc on the stand, the teeth should be perpendicular to the plane of the saw machine.
It is not necessary to make the stand stationary, if necessary it can be made floating, to do this, screw the hinge on one side and hook the second part to the frame with bolts. On a design of this kind, it is possible to easily turn the apparatus disk to the desired angle and carry out work in a given plane.
Work difficulties
Using a sharpening machine for sharpening circular saws, one may encounter the difficulty associated with the formation of incorrect angles. To eliminate such a defect, it is necessary to fix the center of the saw in the necessary position relative to the circle. A groove made on a stand can solve this problem. It will help level the saw. There is a simpler solution - to make stops in the work surface, which can fix the device in the correct position.
Exploitation
Before starting the independent manufacture of this unit, you need to think over the drawings of the machine for sharpening circular saws. They can be calculated on their own, or you can contact a professional. In any case, to understand all the intricacies of the future device, you can not do without a preliminary paper version. If you have the necessary knowledge, then you can cope without resorting to the master.
After the embodiment of the future machine tool on paper, it will become clear what tools and materials will be needed in the process, what is already there and what needs to be acquired.
The do-it-yourself machine for sharpening circular saws, has a great advantage in terms of price over the factory unit. Also, it does not require the possession of special skills for work.
Sharpening without a machine
You can grind the saw at home without the help of a machine. But do not keep it at the same time by sharpening it on the grinding wheel. For proper operation, the efforts of the hands will not be enough, and the eye will not be able to adjust the desired angle. To simplify the task, you can use some kind of fixing device, for this purpose a regular flat delivery is useful. The axis of the grinding wheel should coincide with the surface of the stand. And the circle, in turn, should be placed perpendicular to the saw. If it is necessary to make corners, the structure is made movable by means of hinges. But here there is a difficulty in maintaining the same angle of the front and rear sharpening. Rigid fixing of a saw wheel concerning an abrasive disk will help to avoid this. This can be done with the help of a mandrel groove or by fixing the stops in the stand, which will allow you to fix the corner.
Conclusion
Like any tool, a circular saw needs proper operation and maintenance. Compliance with the technology will increase the life of the product.
So, we figured out how to make a machine for sharpening carbide saw blades. To do this, you will need very few materials, as well as some skills and a desire to make a useful thing with your own hands.