How to change a disc saw on a manual circular. Repair of engine elements

How to remove a diskrlard saw disk

Consider the most important characteristics of the disks that will allow you to choose the necessary nozzle from a huge modern assortment.

The manufacturer. Manufacturers of such nozzles are often specialized tools for the production of tools

Therefore, the quality of components of companies can pay less attention, focusing on equipment. But this cannot be said about the promoted brands, such as Bosch or Makita, which not only value their reputation, but also have the opportunity to use better raw materials and modern processing technologies

Therefore, one of the main parameters of saw discs and milling plants is the brand. The next important parameter that determines the capabilities of the sawing nozzle is the size of the circle, or rather, its external and landing diameter. When evaluating this criterion, it is necessary to worry in advance about the calculations and clarify the necessary depth of the cut, which will become a measure of external diameter. But when choosing, it is also necessary to remember the size of the tool and its protective casing. These dimensions can make it impossible to install a large diameter disk, since removing protection is unsafe and not always possible.

This is possible if the inner diameter of the disk is greater than the covers of the shaft. After all, after fastening the disk, it will create an imbalance of the tool and, as a result, a high level of vibration. Depending on the model of the tool, the diameter may have values ​​in the range from 16 to 32 mm.

• When considering the saw discs, one can distinguish such criteria as the shape and angle of inclination of the tooth. The first is responsible for the possibility of cutting this or that material, and the second. for the type of saw. So, it is easier to perform longitudinal cuts with a positive inclination of 15 to 20 degrees, and the cut of dense materials is better to perform a nozzle with a negative inclination from 0 to.5 degrees. There is also a standard type of tilt that is considered universal.
• As for the disk cloves, they can be universal, flat, interchangeable, have the appearance of a trapezoid or an increased slope. It is good to perform the shared cuts of solid varieties of wood, with the interchangeable disk with a flat cutter. to make a cut of milder varieties of wood and wood.fiber slab. Tunts in the form of trapezoid purely saw soft materials, such as plastic.

All of the above technical characteristics of the saw disk are indicated on it. Typically, the marking is performed in the form of the corresponding pictures intuitively understandable to the user with the necessary numerical data.

Circular saw repairs of the upper protection

Remove the canvas and lower protection. For repair, access to the screws of the upper protective casing is necessary. In most models, first unscrew the gearbox and remove it from the upper protective casing.

Then unscrew the upper protection and carefully remove it from the engine body. If necessary, install your finger behind it and on the engine shaft to hold the engine inside its body

Disconnect the grounding wire from the upper protective casing, indicating its position for reverse assembly.

Connect the ground wire again, then carefully put the upper brush on the engine shaft. Score the upper brush in place on the engine housing

Install the gearbox assembly and turn the shaft manually.

If the shaft rotates unevenly, carry out repairs of the drive gear and spindle. Otherwise, screw the gearbox in place, install the lower protection element (step 3, above) and again.

What can I cut out

Use disk electric saws for longitudinal and transverse sawing of wood. as lumber (boards, boards, rods), as well as wood and logs. But with logs you can work not manually, but a stationary circular saw. Chain saw is most likely suitable for a hand tool.

Disk or round hand saws. one of the most universal tools

In addition, a manual disk saw can cut any sheet material. wood.fiber plate, wood.steering plate, OSB, plywood. By changing the disk, you can dissolve the sheet metal (profiled and smooth), you can see the reinforcement rods and other metal products. It is also possible, when choosing a disk, cut ceramic and some types of paving slabs, plastic products, slate, drywall profiles, non.ferrous metals. Truly a universal tool, beloved by many masters.

The only work that is undesirable to do with this tool. it is cutting metal tiles. Any manufacturer necessarily indicates that the use of circular saws is unacceptable, otherwise the material will be removed from the guarantee. The fact is that a lot of hot sparks fly at work that burn a layer of paint. As a result, a few months later on the surface, in those places where the paint layer was burned, there are several rusty spots. Then rust quickly spreads throughout the roofing material. Therefore, manual circular saws should be used. For this work, scissors for metal are more suitable. manual and electric.

The main malfunctions and their signs

Typical faults of manual circulars include the following situations.

• The saw does not turn on. A network cable, electric fork, start button or electric brushes may be faulty.
• The engine engine is very hot. Such symptoms can be the result of an inter.seal circuit (cliff) in the coils of the anchor or stator, as well as an too intense mode of operation of the unit.
• The gearbox of the apparatus is overheated. Overheating of this node can occur due to the failure of the bearing or lack of lubrication on the gears.
• The brushes sparkle. This usually happens due to their excessive wear.
• A burning ring is visible around the engine collector. If during the operation of the unit there is a circular spark around the engine collector, then its appearance can cause a malfunction of the anchor winding or clogging of the space between the lamelons of the collector of graphite dust.
• The unit does not develop the required power. Power drop can be due to the drop in voltage in the network, a malfunction of the engine windings, wear of electrical brushes, and the trigger malfunction.
• During operation of the unit, the rattle and other extraneous sounds are heard. These symptoms can be caused by a breakdown of the gears of the gear or a malfunction of the bearings.
• The engine is buzzing, but the unit does not work. Perhaps jamming in the gearbox occurred.

Technical specifications

The main parameters of the manual disk circular saw Interskol DP 190 1600 m for 1600 watts:

• The operating voltage in the network, suitable for the saw. 220 volts;
• operating frequency 50 Hz;
• The number of engine speed is 4800;
• engine power 1600 watts;
• disk. 190 mm in diameter;
• the maximum depth to which the tool can make a cut is 63 mm (angle of 90 degrees);
• Circular weight. 5.5 kg.

External disk size

For a small, portable tool, the size of the disks is from 13 to 25 cm. The speed of cutting the material does not depend on this size.

This parameter determines only the possible depth of the saw. To increase it, a tool with a higher engine power is required.

Circular puck for circular saw?

Flange or clamping washer securely fixes the disk. On various models, saws are used both by a separate flange from the bolt and soldered with it.

The main function of the clamping washer is to evenly press the sawing canvas to the pulley. A properly installed clamping washer should sit symmetrically on a circle.

The main and main rule when replacing the disk with a circular saw is the complete disconnection of the tool from the power supply. In order not to accidentally injure the saw with a saw, it is better to use gloves.

Replacement of the Skil disk. We change the saw disk.

Today we will change the saw disk on our circular Skil. Why am I going to write about the replacement of the disk, because suddenly there was a problem that we encountered when we dismantled this disk, and if we encountered, then perhaps someone also encountered, so this page is for them.

The first thing that is always not by the way is the lack of appropriate tools when we need to remove the saw disk and install a new!

Unless, of course, you have tools in the kit, then you need to use them. T.e. You should have one tool with two protrusions and the second. this is an ordinary unfortunate or simple key. We insert the first, about unscrew the second.

But as we have already said above, we lack these tools in principle, because the circular is old, I don’t even remember that these tools were at all.

An interesting feature is that when I started changing the disk. It turned out that the Skil circular instead of an ordinary hexagonal bolt, internally a hole for a hexagonal key n at a pancake, I think it’s generally fun.

And I run between the cottage and the house and is natural that rare tools in duplicate.

And he almost fell in the mood when he found that there was a key, it was worth lifting the supporting plate, and there was our desired hexagon. Well, further, as they say. business in the hat.

We clamp somehow, in this case, we say. That we do not have tools, therefore, we take some kind of wood and insert in this way:

Well, then we just need to unscrew the bolt, twist counterclockwise.

Next, pull out the disk and insert a new one, and repeat the actions in the reverse order!

INTERSKOL took the INTERSKOL disc to experiment (unfortunately, at the time of writing the article there are no such disks, but there are many others, for every taste and color), I do not think that it will be high.quality, but also for this size, internal and outer, there was nothing I had to take it.

And since I constantly buy in one place, I don’t want to go for “cunning” discs at all, I also buy it in the same place. In fact, I looked after professional discs, but it is painfully biting prices.

As for the circular itself. Then we already wrote about her for a long time, I only want to add. that a great circular and the disk was a native gorgeous. I worked for sure for 10 years and for dirty work I will use it. He did not throw it out, but put a new one to try clean saws, I need to make a rack and generally a lot, because they bought a garden instead of the village, and apparently people lived without “hands” there

And by the way, on a large circular (but we have not yet written about it, on the day of the release of this article, but we made a portable circular machine from it, of course it was so.so, but it was done not for beauty, but rather to finish a fucking repair!), I also bought Interskol, it is for the same reason.

And in general you need to try to sharpen saw wheels from both circulars.

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Do.it.yourself disk saw repair

When starting to repair the unit with your own hands, it is not necessary to disassemble it completely to clarify the reasons for the breakdown. Some malfunctions are characterized by specific symptoms by which you can determine the problem and already purposefully disassemble this or that part of the device.

The saw does not turn on

If when you press the start button, the engine of the unit “is silent”, then the first thing to focus on is the network cable, provided that there is electricity in the outlet (connect the device to another outlet for verification).

Advice! Before checking the cable, you need to disassemble the electric fork and make sure that the cord conductors are connected to its pins.

To check the electric cable, you need to disconnect the handle. This will help to get to the contacts to which the wires of the network cord are soldered. Further, with the help of a tester, call each wire, pressing one probe to the soldered contact, and the second. to the pin of the fork.

If the network cable is intact, then in search of a malfunction do the following.

• Blind the entire chain by the tester, starting from the cable entrance to the unit to the launch button. You should also check the contacts of the button at its input and output with the key pressed. In normal condition, the torn chain should be closed. Call all the wires after the button going to the engine brushes.
• If everything is in order with the conductors, check how much the electrodes of the brushes have worn out. After wear of the electrode 2/3 of the initial size, it should be replaced. Brushes, regardless of how much each of them has worn out, change in pairs.
• If the brushes are in good condition, then, most likely, the engine has failed. In his windings, a cliff or inter.flip.circuit could occur. In this case, it is better to entrust the engine repair to specialists who will rewind the stator coils or anchor.

The engine heats up

The unit can heat up excessively, for example, with its intensive use, as well as when sawing hard wood or the use of a saw disk with a large number of teeth, when the load on the engine increases significantly. Also caused by overheating of the malfunctioning motor associated with the windows of the stator and anchor, which are eliminated only in the service center.

Brushes are burning

Strong sparking from under the brushes is caused by excessive wear, when the spring can no longer press the electrodes to the collector with the required force. To replace the brushes, you need to disconnect the engine cover or remove them through special holes in the engine housing (depending on the power plant model).

Jammed the shaft during operation

This malfunction may happen when for any reason, a stopper is pressed during the tool. It is designed to fix the shaft when replacing equipment and should be used after a complete stop of the engine. Otherwise, the Stop Stop rod breaks down, and its debris fall into the engine, causing jamming. There are frequent cases when this leads to deformation of the anchor shaft. Also, the consequence of pressing on the stopper can be the split of the gearbox body, the fragments of which can damage the gears and provoke their jamming. To solve the problem, you will need to replace the anchor, a stopper leading (large) gear of the gearbox and its body.

In some cases, the gearbox can jam with the complete destruction of the bearing.

The saw stops in the process

The engine stops in most cases cause a cavity worn electrical brushes. Когда контакт между электродом щетки и ламелями коллектора нарушается, происходит выключение агрегата.

Often, when buying brushes for a given apparatus, products with a short conductor connecting the electrode to the plate come across. This conductor is located inside the spring and does not allow it to be completely imprisoned. Когда электрод изнашивается до определенной длины, то прижим его к коллектору прекращается, поскольку этому препятствует короткий проводник. If you, examining the brush, find that it is not yet worn out and the spring is not unclenched, then the part should be replaced.

The gearbox body is very hot

The rapid heating of the gearbox occurs if the shaft bearing is unusable, on which the gear is fixed and the equipment is attached. In this case, in addition to heating, you can replace the appearance of extraneous noises in this unit node. It is necessary to disassemble the gearbox and change the bearing. The gearbox will also heat up if it is not enough lubricant or it is completely absent.

Advice! Periodically, you should disassemble the gearbox and check the presence of lubrication. If necessary, refill with lubrication the internal space of the node. For these purposes, you can use a special lubricant for gearboxes of corner grinder.

The saw does not gain power

If during the use of the unit you noticed a drop in its power, then it is first recommended to check the voltage level in the network. Sometimes even a slight drop can negatively affect the power of the power tool.

Also, loss of power can be observed with wear of the bearings of the anchor or gearbox bearing. In this case, extraneous noises will be heard, previously not characteristic of this unit. By their localization, you can determine where the problem bearing is located. in the gearbox or engine. To replace bearings, you will need to disassemble the disk saw. How to do this was described above.

If during the operation of the unit is not heard, the engine still poorly develops momentum and power, then pay attention to its collector. Usually on it you can see a circular spark (fire ring). This can happen due to the inter-flip closing of the anchor coil or the accumulation of dirt between the collector lamps.

Expand the engine housing and carefully inspect the collector (the place where the electrodes of the brushes glide). It consists of parallel stripes (lamellas). There is a small gap between them. When this gap is clogged with conductive graphite dust formed during the wear of the brushes, a short circuit occurs between the lamels, and a burning ring around them appears.

Expert advice

Experts recommend adhering to the following tips:

• Before disassembly, carry out a preventive inspection of the technique for proper diagnosis. The complexity of subsequent work will depend entirely on the severity of the breakdown.
• After processing all the elements, the “polishing” of the fixing cut begins. There are cases that the latch is strongly protruding. The chain in this case does not reach the surface that must be cut. Another situation may happen when the latches are too deepened, and the canvas stuck in a tree.
• Dismantling of electric saws is an important phase during repair, which should be carried out strictly according to the rules and in compliance with safety precautions. It is necessary to de.energize all the unreliable elements, avoid garbage entering the teeth during the preventive inclusions of the tool.

With your own hands, saws of any kind can be repaired. To do this, you need to know the disassembly scheme and the rules for installing new parts in the box, observe safety precautions during the reconstruction of the tool, and regulate the supply of the mains.

The choice of a disc saw

The circular should meet the requirements of safety precautions, be clear to use. The profile of the teeth and their number on the saws must correspond to the type of work performed. The disk must be flat, without surface distortion. Before work, the disc plane is inspected by a ruler. For a flat mowing fishing line cutting, sharpening saws plays a decisive role. The sharpened teeth of the saw should not gleam at the corners. The presence of shine reads the missing amount of the polished metal. Burrs, breaks and spinners should not be on the cutting edges of the saw, the presence of these iron formations pulls the spoilage of wood.

We will see in more detail the aspects of which you need to direct attention before buying equipment

The most important aspect when choosing a saw is its power. A large power indicator is required for wood files, the powerful tool will serve longer when performing its own work. When buying a saw, calculate for what work it is needed for you. Saws with high power have a lot of weight, making inconvenience during work. When performing light, short.term cuts, a saw with small power is suitable. It is light and small, with its help you will work rapidly and effortlessly. The power of the disc saw varies between 1200 watts and 2000 watts. The subsequent aspect when choosing. this depth drank a disk saw. Modern circuses are able to make cuts at an angle of 45 degrees, when buying, you need to consider that in a straight drain there will be even more than at an angle. A large selection of disk saws are another criterion. When choosing a circular, purchase a saw with a limiter for even removal of the edge of the boards

With this function you can cross the boards, making it trimmed. It is necessary to pay attention to the number of teeth on the saw disk, the cleanliness of the cut of the board depends on their number. The more teeth, the cleaner the slice

If you need to cut a laminate or wood.fiber slab, choose a saw with 48 teeth.

Read how to saw with an electrician without chips

How to cut boards with a hand saw

For joiners, the board and timber are the most common blanks, of which in the future the production of crafts and wood products is carried out. And the first thing the material is subjected to is the sawing on the segments of the required length. At the same time, you should know how to spill the board evenly, because the incorrect performing this operation can ruin the workpiece or significantly affect the appearance, and not for the better.

For joiners, the board and timber are the most common blanks, of which in the future the production of crafts and wood products is carried out. And the first thing the material is subjected to is the sawing on the segments of the required length. At the same time, you should know how to spill the board evenly, because the incorrect performing this operation can ruin the workpiece or significantly affect the appearance, and not for the better.

In large enterprises, the problem of how to flatten a beam or a board smoothly does not arise. Any serious production has high.precision equipment that performs this type of work. At home, you have to do what is at hand. At the same time, the tool or equipment still needs to be able to correctly use to saw off the board correctly, and the cut turned out without flaws.

Note that many enterprises selling boards and timber provide services for their cutting. And for this they use all the same specialized equipment, so the purchased material will be cut qualitatively. But to use such a service is not always possible, and it often happens that you need to cut only one blank.

Characteristics

During the selection of parts, a number of fundamental parameters of products should be taken into account.

In this case, you must first familiarize yourself with the instructions for the tool. Pil manufacturers indicate this information in the characteristics that have a particular device. As for the external diameter, its choice is based on the dimensions of the protective casing in the circular saw, so the cut.out circle with a large external diameter on the device with smaller dimensions in the mechanism will not be possible to put. The most common disk sizes are the parameters in the range from 120–250 mm. This criterion is not responsible for the intensity of the cut, but is of great importance for the depth of the saw.

And the inner diameter affects the power shaft of the tool. It can be the following sizes. 16 mm, 20 mm, 22 mm, 30 mm, 32 mm. The size of the disk must correspond to the size of the shaft in the saw. In modern models of equipment for fixing circles there are special holes that allow you to fix the part with pins.

The number of teeth

Too many teeth will cause additional load in the motor, in addition, the speed of the saw can decrease. If you use consumables with a smaller number of teeth on the surface, it will be easier to remove chips from the working material, but the cleanliness of the cut will be imperfect. Based on this parameter, the discs can be the following types:

• discs with incisors, the number of which will be in the range of 80–90 pieces;
• products with average indicators where the number of teeth will be in the range from 40 to 80 units;
• cutting circles with a minimum number of incisors, which are from 1 to 40 pieces.

Products with medium values ​​refers to the universal class, therefore it can be operated for processing different wood and wood.containing materials.

Tilt of teeth

For the most part, the wheels for circular saws on wood are made with a positive inclination, due to which the quality of the longitudinal cut increases. With a negative angle of inclination, the radius of the tooth will be directed to the back of the disk. However, longitudinal types of sections are most often performed with a positive deviation of the tooth from the radius, since such a configuration provides a more reliable capture of raw materials. The classification of inclination occurs according to this principle as:

• The angle from 5 to 15 degrees is considered a standard option for the location of the incisors;
• A positive inclination is in the range of 15–20 degrees;
• negative. from 0 to 5 degrees.

Based on these values, it will be easier to choose a consumable part for work.

Disk thickness and options for attacks

The thickness of the cut itself directly depends on this parameter. However, too large products can cause overheating. The most common size is 3.2 mm.

Design features of disk cutters

In this matter, a clear gradation of the circles is a clear assignment. So, flat teeth are used to work on soft or solid wood of longitudinal cut. The element is marked by the manufacturer FT abbreviation. The second type of incisors is called interchangeable, it involves the location of the components in alternating form, where the teeth in turn are inclined in opposite directions. The transverse and longitudinal cuts of wood and wood.containing raw materials perform this disk. In this case, the cut.out circle has an ATB marking.

Combined type discs contain incigans that repeat the configuration of the two previous types. A manual or electric type tool with a Combi disk can be considered a multifunctional device of a universal type, with which almost all types of cuts can be performed. Trapezoid cutters are flat teeth, such products are indicated by the abbreviation TCG.

Circular saw labeling

To determine the parameters of the proposed products, the manufacturer applies certain values ​​to his products, which determine the external diameter of the circle, the thickness of the soldering and circle. Among the most popular disks for wood, you can distinguish products with a marking of 190×30 mm or 190×20 mm.

As a rule, high.speed steel is used to make circles for circular saws. Vanadium, chrome and molybdenum are also used to increase its strength.

Classification of saw wheels for cutting wood involves their division into two main groups.

Monolithic

Products related to this group are recommended for working with all types of wood, and they can also be used for a saw of soft raw materials, such as polymer alloys. High.carbon steel is used for the production of circles. Among the positive features of the products, it is worth noting the affordable cost of disks, they are quite quickly and simply dragged, so the consumables in most cases even after prolonged operation can be restored. Among the minuses of the products, the low strength of the material is highlighted, which leads to the rapid wear of the elements.

Disk mills

Such a working detail belongs to varieties of cutting elements that are used to work with circular saws.

The main functions of the milling plant are as follows:

In addition, the part can be operated both on straightforward and on curved planes.

The work of the cutter is based on the simultaneous functioning of a large number of blades on the teeth. During milling, layers of different thicknesses are removed on raw materials. Hard metal alloys, ceramics and others are chosen as a material for the manufacture of mills. As well as in the assortment of construction stores, you can find mills with diamond spraying on the teeth, due to which the quality of the work performed and its effectiveness increases significantly.

For circular wood on wood, the following varieties of the cutting canvas are used:

Each type of part has its own purpose, on which its configuration depends.

The main malfunctions and their signs

Typical faults of manual circulars include the following situations.

• The saw does not turn on. A network cable, electric fork, start button or electric brushes may be faulty.
• The engine engine is very hot. Such symptoms can be the result of an inter.seal circuit (cliff) in the coils of the anchor or stator, as well as an too intense mode of operation of the unit.
• The gearbox of the apparatus is overheated. Overheating of this node can occur due to the failure of the bearing or lack of lubrication on the gears.
• The brushes sparkle. This usually happens due to their excessive wear.
• A burning ring is visible around the engine collector. If during the operation of the unit there is a circular spark around the engine collector, then its appearance can cause a malfunction of the anchor winding or clogging of the space between the lamelons of the collector of graphite dust.
• The unit does not develop the required power. Power drop can be due to the drop in voltage in the network, a malfunction of the engine windings, wear of electrical brushes, and the trigger malfunction.
• During operation of the unit, the rattle and other extraneous sounds are heard. These symptoms can be caused by a breakdown of the gears of the gear or a malfunction of the bearings.
• The engine is buzzing, but the unit does not work. Perhaps jamming in the gearbox occurred.

To come in

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Cruel designer, with a very shitty engine. Exoal Sparky does not smell here.

Even if we assume that the saw will survive until the brushes are replaced, it will not be easy to change them. It will be necessary to completely disassemble the saw and pull out the engine to unscrew the second self.tapping screw on the bunker.

I recently came to me such a machine, pretty well made. But that’s not the point. They brought it with an interesting problem, when starting, a strange “moo” is held literally a second, then everything works fine. During disassembly, no malfunctions were found, the bearings are ideally, moreover, if you run the saw without a disk, there is no moo. With the disk, when starting, second moo occurs. Who has come across a similar problem? I found such a video on another Makitov saw on YouTube.

Read also: Square vibrator EV 98 Technical characteristics

I found another video as a person under warranty repaired the brake at this saw. Well, everything is there as always in the spirit of warranty. Changed the floor of the saw, in the end it turned out that the problem is in the rotor. he burned there windings. Met and earned everything.

It seems to have a good drink. everything is convenient and neatly. But the Chinese made a shit engine.

In principle, a saw can be said to be a clone of Makitovskaya 2414NB

The story really already shook someone, but the jamb was not eliminated during the assembly, as a result, everything has died almost without working. The stator chatter, as always, climbs out “side”. For some reason, many collectors do not pay attention to this.

Due to active use, the technique often needs to be repaired. But the repair of circular saws may be required even with moderate workload. During the operation and maintenance of disk saws, in the abdomen of the circular, one should take into account some aspects of their functioning, be able to diagnose the ability to eliminate problems.

If the saw lost power, began to seize and stop, these are specific symptoms of its failure. Additional signs indicating a malfunction of the device include overheating of the motor, difficulties in starting, the appearance of smoke in other words of the aroma of Gary, sparking of snuts. In these many cases, the tool can be immediately disabled and sent to diagnostics. Town as a goal of repairing a circular saw, they usually turn to the services of masters, but there are methods to cope with a breakdown without the help of others.

How will you see it?

A saw disc for a circular saw should be selected depending on the type of cut. it can be transverse or longitudinal. In addition, the materials that you plan to see play an important role. wood, plastic, wood.steering plate, non.ferrous metals, pipes, we note one thing: each series of discs is designed specifically for certain types of work ,

The quality of the disk blade directly affects the efficiency of sawing. A good blade is created by a laser harsh, with a balancing performed on a computer. Each disc is luggage separately. High.quality fabric in the light will reflect the marks from the grinding tool. If the canvas is rude and looks roughly processed, such a saw disk for circular

the saw will not provide effective work and will dull faster.

How to cut a board / lining through a circular saw

Firstly, a fishing line for a trimmer cutting is marked on the board. If high accuracy does not need anything, you can mark with a pencil and cut off directly along the line. If you need to combine up to a millimeter, then draw a fishing line for a trimmer with a knife blade, and the cutter is allowed along this line.

Then the board is fixed on the goats pressed by the knee. The saw disc is fed to the place of sawing, the distance to it is at least 10 mm. The saw moves to the drawn line. Combining the chisels with a dash, turn on the electric saw and direct it to the edge, smoothly advanced forward. Closer to the end of sawing, just slow down, then finish the remaining distance into one smooth breakthrough. Thus, you can avoid a chip that sometimes occurs with a cross section.