Woodworking is a labor-intensive process, but the appearance of a circular saw made it easier to cut wood and increase labor productivity. However, if you decide to purchase wood cutting equipment, you need to know how to choose a circular saw. A modern circular saw is a device that has a number of additional options. There are circular saws that are designed to work with metal. Unlike traditional angle grinders or “grinders”, where an abrasive wheel is used, the saw for metal is supplied with a gear disk, which is based on tool steel.
At present, the circular saw has acquired additional functions, it can cut not only wood, but also metal, the speed and quality of your work depends on its correct choice.
You may prefer one of the types of circular saws, for example, an immersion circular saw is a type of saw designed to make grooves, crevices, all kinds of grooves and other similar work. For example, it allows you to equip an opening in the worktop that will be used to mount the sink.
Circular saws classification
Choosing a saw, you should know that all circulars, depending on the technical features, can be divided into 3 types. The first type is small saws, which have a capacity of 800 watts. With their help, you can get a cut, the depth of which does not exceed 45 mm, for this reason, the area of their use - finishing materials, wood of appropriate thickness, OSB, plywood cloth and chipboard.
A table showing the cutting speed depending on the diameter of the saw and the speed of its rotation.
Circulars that belong to the middle class, have electric motors whose power is in the range of 1.4 kW. The units can be used in tandem with cutting discs of a larger diameter, which allows to get cut in the range of 60 mm. Such an installation can be used to process boards that are thicker. In addition, a similar saw to cope with soft metals, but for this it will have to provide a special disk. The saw is recommended to be used in the household purposes.
Features of small saws and middle class tools:
- suitable for private use;
- have low cost;
- convenient to use.
Features of industrial saws:
- have high power;
- have a high price;
- can be used without time limit.
Another type of circular is a large manual installation, the power of which is much higher and reaches 2.2 kW, they can cut materials with greater thickness - up to 130 mm.
Classification saws on the design of the saw blade, cutting teeth, by purpose: 1 - from a single saw blade; 2 - with inserted teeth; 3 - with carbide plates; 4 - from steel sheet bent into a cylinder.
This type of saw is a tool designed for special tasks. It can be used in the conditions of large construction objects, it copes with the implementation of complex production processes.
Such a saw is most likely not suitable for a home craftsman, since it has a lot of weight, and the price is much higher than the cost of a tool that belongs to the middle class.
If you want to have a tool that will work without power supply, then you should prefer the battery circular. However, its cost is very high. You should not count on significant power, as well as for a long time of work, which on a charged battery will not exceed more than an hour.Back to table of contents
Choosing a tool for technical features
Choosing a circular saw for private use, you need to pay attention to some specifications.
Circular saw characteristics.
It is preferable to purchase that saw, which has an engine with a power in the range of 1.4 kW. With the help of this tool you can ensure a comfortable work without the application of a large amount of effort. The saw has an electric motor, the power of which will be enough to work with disks Ø200 mm, which allows you to get a cut with dimensions greater than 55 mm.
Saws should not be acquired if you do not know how much disk rotation it can provide. Some of them demonstrate the limit, limited to 1,8-5,5 thousand revolutions per minute. If you cannot make a choice in the direction of one tool of two with equivalent power, then it is worthwhile to incline the choice in the direction of an aggregate that is able to function with greater frequency. A good quality circular can develop approximately 3.5-4.5 thousand revolutions. Such features guarantee the most even cutting, whatever materials are used.Back to table of contents
Management System Features
In order for the unit to function in the most optimal mode, the saw receives different control systems, among them the soft start system of the engine, it helps to reduce the starting current, which increases the working life of the device.
General principles of adjustment of the circular saw.
Circular saw can have a smooth adjustment of the number of revolutions of the disk, which allows the master to choose the appropriate mode of use of the unit when processing different materials. However, if such an addition is not included in the design, then this cannot be called critical, because the overwhelming majority of craftsmen are used to using as many revolutions of the disk as possible.
But if there is a device in the saw that is responsible for maintaining a constant rotational speed at the moment of varying the intensity of the load, then this can be called a clear advantage. Circular, devoid of such a system, can stall if its working surface collides with knots or other parts of the element being cut, which have great hardness. Automation guarantees the same speed of rotation of the disk, which makes cutting easier, while the engine remains intact. If we neglect the observance of the mode of operation, this can cause excessive engine overheating, for this reason a good saw should have a self-shutdown system with a sudden increase in current and maximum heating of individual parts of the electrical system of the structure.Back to table of contents
You can choose a circular saw, but it is important to consider that it acts as a dangerous power tool, this explains the fact that in the production of such units, great importance is attached to ensuring safe operating conditions.
The main types of teeth are circular saws.
Thus, whatever circular saw you choose, it must have a specific set of devices. Among them, the blocking of unintentional activation, which is done by installing the button, preventing inadvertently pressing the starting handle. The design should also have a protective cover that covers the cutting surface. The upper part of the unit is stationary, while the lower one has a pendulum device, which exposes the working part of the cutting surface in contact with the material being cut.
A number of models have a system that allows you to bare the pendulum protection with your own hands, this is required if you need to start cutting not from the end of the element, but from the central part of the canvas.
Since the saw involves the formation of a large number of sawdust, the unit must have a system designed to protect the respiratory organs, as such an addition can make an industrial vacuum cleaner that removes the resulting debris from the work area.Back to table of contents
All main components of the saw blade are fixed on the surface of the cast platform, and for more comfortable use of the tool, right- and left-hand placement of the motor can be used.
Circuit device circular saw.
The described feature will be appreciated by those people who mostly use the left hand. If you decide to buy a quality tool, then you should pay attention to the fact that there should be a spindle lock device in it. This system helps in the process of changing the disk.
Some models provide the ability to carry out cutting at an angle of up to 45 °, the tool can only deviate to one side. There are saws, the design of which guarantees the change of the angle of inclination positionally, but professional models allow you to smoothly change the required value, while guaranteeing accuracy up to several degrees.
You can choose a unit that allows you to change the parameters of the cut, it can be useful for sampling quarters.
If it is necessary to cut along long boards, a clamping of the disc may occur, to avoid such an effect, some saws are supplemented with a spacer knife, which prevents the cut of the cutout from closing.
Buying a saw, you should not assume that the tools of such a purpose of domestic production are inferior to imported models. Two criteria by which they are in the second position are ergonomics and design, however, reliability and level of efficiency in some cases may be better, while the cost of foreign analogues is, of course, higher.