And so soon summer, the time of vacations, work in the country, a favorite time for the implementation of all kinds of home projects. The choice of modern stores in the choice of materials is huge, but nevertheless the most popular and demanded material among home craftsmen is wood and materials based on it. But we are not talking about them, but a tool that processes wood with success. Choose 12 table saw blade with our help.
The main operation in wood processing is, of course, sawing. And best of all, most
sawing cases with a circular saw. Perhaps some home craftsmen will object – that, they say, a jigsaw can be cut more universally for them as they wish, and a straight cut and a figured one. The jigsaw makes it easier to work with any workpiece that is more or less fixed. And what only home craftsmen did not do with a jigsaw, you cannot list everything. I admit that the jigsaw is a very versatile tool, and nevertheless, you have to object. The main cut in wood is a straight cut, the width and depth of cut may vary, but, as a rule, cutting involves straight lines. But the jigsaw is not an expert on straight lines, it was created for circular sawing. Of course, a jigsaw will master a straight line, every home craftsman relies on a firm hand and a faithful eye, who makes a guide.
But who guarantees you a perfectly straight cut when using a jigsaw? Let’s also take into account that the jigsaw is not a “sprinter”, for circular cutting speed is not the most important parameter. And why reinvent the wheel if the tool for fast and accurate straight cuts has long been created. This is a conventional circular saw. We will not consider stationary circular saws, they are heavy, bulky (weight in 10 kg). And consider hand-held circular saws, the choice of which is simply abundant today. But choice is good, but it raises a choice problem. Naturally, everyone should solve this problem for himself, based on the tasks that he would like to solve. The article is intended to facilitate the problem of choice. And so what is a circular saw.
Structurally, all saws are arranged approximately the same (we will not consider expensive professional models).
Base plate: the saw itself is attached to it. The base plate for its seemingly simplicity and prosaicity plays an important role. The whole saw is attached to it through a special mechanism.
Base plates are available in stamped steel and aluminum alloy.
Saws with a stamped base plate, as a rule, are cheaper than those with a cast sole in terms of power and performance. The stamped plate is almost impossible to break, but any strong mechanical impact, for example, if dropped, will deform the base plate. There is no need to explain that it will not be possible to get a high-quality cut from such a saw. It is often not possible to straighten the bent base plate. In addition, stamped base plates are inferior to cast ones in rigidity. Therefore, expensive professional circular saws are equipped with a cast base plate.
Their rigidity is beyond praise. The only downside is that if dropped, the aluminum alloy plate can crack. However, it is already clear that the instrument must be handled with care.
On the base plate, almost all saws have a stop attachment, which allows parallel cuts to be made relatively accurately. By the way, the parallel stop is included in the package with many models of circular saws. The fastening of the stop itself is made in front, although there are models in which the stop is attached in two places in front and behind. For cutting especially “delicate” materials, a special nozzle for the base plate is put on the sole. The attachment, if provided and produced by the manufacturer, is included in the delivery set. Professional saws on the base plate have a special groove that allows you to work with the guide rail. Using the guide rail it is possible to achieve very high precision. Guide rails are not included in the delivery set and must be purchased separately.
The mechanism responsible for tilting the saw to the side.
As noted above, the saw itself is attached to the base plate by means of a mechanism that tilts the saw to the side. The mechanism itself is quite simple, there are two protrusions on the plate, to which the eccentric mechanism is attached with the help of two pins. The pins themselves
do two things, hold the board and tilt the saw to the side. Adjustments are designed to hold the saw at the selected tilt angle. As a rule, the saw can be deflected at an angle of 45 degrees, although this is not the limit there are saws with an angle of 60 degrees, but these are expensive exclusive saws. The saw is tilted to the right, but here one important point needs to be clarified. The lion’s share of the saws are arranged with the saw on the left and the blade on the right. For saws with such a traditional layout, tilt is only possible to the right, tilt to the left is simply not possible, the engine interferes.
But there are saws whose disc, on the contrary, is to the left of the engine. For these saws, the opposite is possible only to the left. These are small saws, called “parquet” for a simple reason. The main purpose of these saws is to cut thin sheet material. According to the experts, this arrangement is more convenient for cutting work than saws with a traditional blade arrangement.
This mechanism is designed to adjust the cutting depth. In circular saws
at the moment, an eccentric mechanism is used. Its essence is that the saw is fixed in front of the support on a fixed axis, and has freedom of movement, in the vertical plane. Tilting the saw up and down adjusts the cutting depth. The adjustment itself is carried out using a screw and a guide at the rear of the support. The eccentric immersion mechanism is currently the most common. And comfortable enough. But nevertheless, we note another submersible method. This mechanism is usually used on expensive saws, but it is also used in more affordable models. The bottom line is that the saw moves in a vertical plane along two guides (rods). It is believed that this arrangement is more reliable due to the better positioning of the riving knife.
It is not necessary to write about the purpose of the additional handle.
The only thing I would like to note is that the additional handle is of two types. The most comfortable handle, in our opinion, is located on the saw platform – it gives a better weight distribution. The more common additional handle in the form of a “mushroom” on the body itself saws.
Protective casing: Actually, it consists of two parts, an upper non-movable casing and a lower movable one. Their purpose is clear from the name. On the upper protective casing, there is a technological hole for removing sawdust during operation. It should be noted that the shape of the hole is different. If during operation the saw will not be connected to the vacuum cleaner, then the shape of the hole does not matter. If not, then you need to pay attention to what shape the hole is: if the round – full order, if the hole is far from the circle in shape, then you need to inquire about the availability of a special adapter for the saw.
Riving knife: Its purpose is to prevent the workpiece from jamming the blade during sawing. The riving knife is attached with one or two bolts. For ease of mounting and dismounting, many saws are equipped with special holes in the upper casing. If these holes are absent,
then access to the knife mounts is carried out by setting the saw to the position corresponding to the zero cut. Dismantling the riving knife, in fact, is a very infrequent operation, and is used when you need to start sawing the workpiece not from the edge, but from the middle.
Start button: The start button on the saw is not quite ordinary, it is associated with a protection mechanism against accidental activation. You cannot press the button without pressing the unlock button. This ensures increased safety in the use of the circular saw. The start button itself may differ in size. The most convenient buttons are large, on which two fingers fit freely.
Spindle lock: A mechanism that makes it easier to install the blade, as a rule, is found only in expensive imported saws.
Power cord: It would seem so much easier than a power cord. Nevertheless, if it is supposed to work outdoors, under the influence of low temperatures, a rubber-insulated cord is preferable, which, unlike plastic, is more flexible and does not lose flexibility under the influence of low temperatures.
Motor: The main motor used in circular saw blades is a single-phase, synchronous collector motor. This means that there is a collector-brush assembly in its design.
Brushes are one of the most worn out parts, and here it is important not to miss the moment when the brushes will wear off and can damage the manifold. In many advanced imported saws, self-disconnecting brushes are installed, many saws in the body have special technological holes
for replacing brushes. Saws are equipped with motors of different power. The higher it is, the better the engine copes with the loads, naturally, the weight of a larger motor is higher.
Electronics: Not present on all saws. The main purpose is soft start, speed control, overload protection, keeping the speed at a constant level.
Saw blades: The saw blade is the most important component of a circular saw. We must remember that each saw is designed for a certain size of the disc, namely the diameter of the disc and the bore. I would like to note right away that the use of discs of a larger or smaller diameter is
not recommended and even prohibited. In the case of a mismatch in the diameters of the bore, the position can be corrected by using special adapters (adapters).
There are 6 main types of blades:
Type-A – the blade is characterized by a large number of variable teeth. Designed for sawing chipboard, aluminum alloys, plastic
Type-B – a universal-purpose blade for various types of wood and wood-based materials. It is characterized by high cutting quality.
Type-C is a blade with fewer teeth than previous discs. The purpose of the blade is sawing hard and softwood as well as chipboard.
Type -D- This disc has a small number of flat teeth. The blade is used for fast cutting and has a rough cut quality.
Type -E- disc with a large number of teeth. Designed for thin cutting of softwood
Type -P- disc with a few teeth. Designed for rough cutting of softwood.
In conclusion, it will not be superfluous to emphasize that a circular saw is that tool, working with which
it is necessary to comply with all safety requirements.