How A Circular Saw Works
Circular saws by type of work performed and used materials
Various wooden elements can be cut into pieces using a conventional circular saw. A conventional circular saw is able to cut various wood pieces at different angles into pieces. However, there are circular saws for special purposes. Some of them are capable of sinking into wood, others are adapted to work with metal.
1. Metal circular saw. A saw that is supposed to work with metals should be more powerful and adapted to work with different cutting blades of standard abrasive and high strength. In fact, it is the most versatile tool that allows you to cut any materials: sheets, pipes and profiles made of metal, wooden blanks, plywood, plastic and the like.
2. Plunge-cut circular saw. This class includes hand-held circular saws and stationary, with a movable saw blade. The cutting edge of such tools can go down to the center of the part and start sawing from this point, which allows you to cut through holes in the workpieces. Such devices are most often used for working with plywood, OSB and similar sheet materials.
A visually noticeable feature of submersible circulars is the absence of an automatic lower protective cover and a special design of the base plate, which allows you to adjust the cutting depth with millimeter accuracy. This allows you not only to make through cuts, but also to make straight and curly (if the saw design allows you to make cuts at an angle) grooves, grooves and slots.
Before choosing a circular saw for wood for your home, it is imperative to consider such devices, since they have maximum versatility.
Overload protection system
Practice shows that most often overheating of the motor of an electric tool is not allowed by beginners, but by masters with extensive experience, who, due to haste or for some other reason, stop listening to the state of the engine. In this case, the safety of the windings and their protection from overheating is taken over by the motor overload protection system, which monitors the level of energy consumption and turns off the power when there is a sharp jump in the load on the network.
To prevent the wire from twisting at least near the saw itself, the cable is led out of its body through a long and rigid input sleeve.
Soft start system
The importance and usefulness of this function does not have to be proven, especially considering the average speed of rotation of the electric motor shaft:
- The service life of the electric motor is increased, since when it starts up, excessive inrush currents do not occur in the winding.
- If, for some reason, the saw is started already in a partially cut groove, then the possibility of cutting the saw teeth into the material and the accompanying sharp jerks of the tool is excluded.
- When used in the design of a gearbox, the soft start system significantly brightens up his life, which otherwise would surely be spoiled by sharp jerks at the start.
Sometimes this characteristic is confused with the diameter of the bore, but the latter is usually not so important and only shows whether a particular blade will fit the saw seat. The full diameter of the disc is fundamental for the circular saw as a whole, because it is for it that all other characteristics are selected.
The relationship here is very simple, the larger the diameter of the saw blade, the more powerful and with a large torque value the engine should be, this affects the starting speed, smooth operation and a decrease in the likelihood of jamming. The more powerful the engine, the more difficult the protective and stabilizing work of the saw should be, the filling, in turn, all this leads to an increase in the weight, size and cost of the circular as a whole.
All these difficulties are necessary and important, since the larger the diameter of the disc, the thicker the part it can cut in one pass.
The weight of the steel blade creates a fairly high inertia of rotation, which is fully manifested after a power outage at idle. When the trigger is released, the disc can spin for a minute or two with enough force to cause injury. To eliminate this possibility, an electrodynamic brake system is applied after releasing the start button, the motor rotor is decelerated by countering the movement of the stator field, making only a few revolutions.
Such a system protects the operator from injury, the workpiece from accidental damage, and the circular itself from kickback if the disc teeth catch on a hard surface.
Recommendations for choosing a model depending on engine power
Quite often, in the process of carrying out repairs or construction work, a hand circular saw is needed. After reading this article, you will decide which one to choose. The consumer should also take into account the fact that the tool can have a motor of different power. With higher motor parameters, the equipment will be able to cut material and high density products in a short time. The operator will have no difficulty in cutting. A powerful engine is not afraid of even knots in the wood. But low-power circulars have a significant advantage, which is expressed in low weight. This allows the tool to be carried from place to place. Thus, models with a capacity of 2,000 watts or less will weigh about 7 kilograms. If the saw is characterized by a power of 1200 watts, then the weight will be reduced to 4 kilograms. Do you need a hand circular saw for household tasks? Which one to choose? Price. An important factor when buying. For private use, models with a power of 1000 to 1200 watts are excellent. If the tool is not used professionally, then the power reserve will remain unclaimed. The cost of the product will also depend on this parameter, the difference in price can reach 100 percent or more.
Tips on choosing a professional saw or a household saw. Battery Saw Performance Overview
If you prefer autonomy, then the battery model is best, but you should be prepared for less performance. Among other things, the rotational speed will also be significantly lower than in electric circulars. Such models perfectly cope with wood of small thickness and low density. As practice shows, the battery charge may be enough for 30-50 minutes of operation, after which the battery will need to be charged. This can cause some inconvenience, since charging sometimes takes up to 4 hours.
Select model by price: Skil 5740 LA
This equipment, which has a power of 700 watts, is characterized by 4300 rpm. The cost of the tool is 3,700 rubles, the landing diameter is 16 millimeters, the cutting depth is 40 millimeters. If you need to make a straight, accurate cut in a tree of any species, then you can use this model. Despite its modest characteristics, this equipment has other impressive advantages, including. Ergonomic design, comfortable grip, compactness and low weight of 2.4 kilograms. The instrument uses a power button lock to prevent accidental starting. Increased stability is guaranteed by a large metal wide support. There is a special compartment for storing the key.
Choosing a household saw: Einhell RT-CS 190/1
The main features are the ergonomic handle, due to which even a beginner can handle the tool. This is also why the saw is most convenient to use when solving household tasks. The master can easily change the saw blade thanks to the key and the spindle lock. There is no need to purchase a key additionally, as it is included in the kit. It will be possible to work with the equipment at home, as it has a low noise and vibration level.
This reliable and inexpensive circular saw has a dust extractor with a special adapter that connects to the vacuum cleaner. With this functionality, you can keep your workplace clean. The gears of the reducer are made of a material of increased hardness and strength, which is distinguished by wear resistance and a long service life.
The manufacturer has made sure that the work is made easy, this is also possible thanks to the practical cable clamp. Among other things, it prevents damage and cable coiling. The size of the disc is 190×30 millimeters, the number of teeth is 24. At an angle of 90 degrees, the operator can go 66 millimeters into the material, and 45 degrees, the cutting depth will be equivalent to 48 millimeters.
One of the most important parameters is the power, which in this case is 2100 W. The cutting depth is 100 millimeters, and the rotation speed is equivalent to 3800 rpm. The size of the circle used is 270×30 millimeters, the weight of the device is 9.4 kilograms. For more convenient work, there is a soft start function, which ensures accurate cutting. Safety is guaranteed by instant engine stop due to electronic brake.
The equipment is equipped with a sturdy and reliable die-cast aluminum support base. The operator will not be faced with the problem of a jammed disc, as there is a riving knife in the device. Safety in the operation of such tools is above all, in this case it is ensured by protection against accidental starting, which became possible thanks to a fuse switch.