How to change a circular saw blade

Reviews Makita 5008MG (Makita)

Good saw. Lightweight, quiet, reliable, no vibration. With her help he built and decorated the house.

Ideal for boards no thicker than 50 mm. Has been working for 2 years. Everything is fine, only the hole for the sawdust removal is clogged.

A good tool, lightweight, you can work with one hand, the assembly is good, the disc included is excellent, thin. But it burned out after a year of easy operation, that is, it is not for professional use.

How to replace a disk?

When repairing, as a rule, several types of materials are used, which require not only cutting, but also milling. And different products need different attachments.

This moment leads to the need to replace the wheel with a cutter.

  • In order to perform this operation, you must first make sure that the device is disconnected from the mains. This point is critical to avoid serious injury. When changing a circle, even an experienced craftsman can accidentally press the start button, and the health consequences will be dire. Therefore, when working with cutting electrical units, it is necessary to strictly observe all the rules of safe work.
  • Next, you need to prepare a hexagon. It unscrews almost all the bolts on circular saws, both foreign and domestic. Using this key, you need to unscrew the fastening bolt of the protective plastic casing, turn the guard up and tighten it again, but you can not tighten it tight.
  • Next, you need to insert the hexagon into the mounting bolt of the shaft on one side, and on the other, press the lock button of the same shaft. Then the bolt must be unscrewed, removed the washer-stopper and the disk behind it. It must be changed to a milling cutter and all the steps must be done again, only in the reverse order. First, a washer is placed on the nozzle, then the bolt in the center is manually screwed in and the structure is clamped with a hexagon while the shaft lock is pressed.

After fixing the cutter, you need to check the reliability of the fastening by small longitudinal staggering of the nozzle. If everything is securely fixed, then you can continue to work.

Thus, when choosing an attachment for a circular saw, it is necessary to start from the quality and properties of the material for cutting, as well as the technical characteristics of the saw and the saw blade itself. For low-power, mostly hand-held circular saws, you should not choose blades with too many teeth. This can lead to overheating of the engine and costly repairs.

In the next video, you will find an overview of discs. 24 and 60 teeth.

Monolithic

A distinctive feature of monolithic discs is the large number of teeth. With such a blade, it is much easier to get a clean cut. But it is worth noting the poor ability of these cutting wheels to keep sharpening and the need for periodic divorcing of the teeth.

Sharpening metal is not difficult, but a large number of blades slows down the process.

How to replace a circular saw blade?

Are you looking for information on an older SKIL model or you need an operating manual for a SKIL tool?

There are few tools more versatile than circular saws (also called circular saws). For what only they are not used: they cut wood, metal, plastic, slate, Fiberboard, Chipboard and other similar materials. Replacing the disc, polish or grind by attaching a brush, remove rust. So the tool will definitely come in handy when building a bathhouse or a house.

Circular saws are called so because of the shape of the cutting element, which is made in the form of a disk with a serrated edge. The dimensions of the disc, the material from which it is made, the shape and parameters of the teeth, the power of the electric motor. these are the main parameters by which the tool is chosen.

What can be cut

You can use circular electric saws for longitudinal and cross-cutting of wood. both sawn timber (boards, lining, bars), and beams and logs. But it is not a hand-held circular saw, but a stationary circular saw, that can work with logs. A chain saw is more suitable for a hand tool.

Circular or circular hand saws are one of the most versatile tools

In addition, a hand-held circular electric saw can cut any sheet material. fiberboard, chipboard, OSB, plywood. By changing the disc, you can dissolve sheet metal (profiled and smooth), you can saw rebar and other metal products. It is also possible, with the right choice of disc, to cut ceramic and some types of paving slabs, plastic products, slate, drywall profiles, non-ferrous metals. A truly versatile tool loved by many craftsmen.

The only work that is undesirable to do with this tool is to cut metal tiles. Any manufacturer must indicate that the use of circular saws is unacceptable, otherwise the material will be removed from the warranty. The fact is that during operation many hot sparks fly, which burn out the paint and varnish layer. As a result, after a few months on the surface, in those places where the paint layer has been burned out, multiple rusty spots appear. The rust then spreads rapidly throughout the roofing material. Therefore, it is better not to use circular saws for cutting metal tiles. For this job, metal scissors are more suitable. manual and electric.

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This is what this tool looks like

Reviews Interskol DP 190/1600 M

I have been using it for the second year. I have already installed a bathhouse, a barn, outbuildings and household items, but only one thing around the house. That is different. There are no problems yet. But the power is too small to work normally, you have to drive it slowly.

Good saw. I sawed the boards for the formwork with it, then I finished them to size, I also dismissed a bunch of sleepers for firewood (I cut them on both sides). Works good. I am glad.

Good quality for the price. For a summer cottage or at home, for seasonal work, even if it is a construction site. a great option. The case is robust and well protected from dust. Just one thing: the platform, although thick, is soft. Therefore, when working, make sure that when you leave the board, the knives do not pick up anything. It happened to me, so the platform bent. I will straighten it, as the accuracy of the cut has dropped dramatically. But she’s not bad at work. The disc included in the kit is not very good, I quickly replaced it, but the saw itself was normal.

How to Change the Blade in a Circular Saw

Saw not picking up power

If, while using the unit, you notice 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.

change, circular, blade

Also, a loss of power can be observed when the armature bearings or the gearbox bearing are worn out. In this case, extraneous noises will be heard that were not previously characteristic of this unit. By their localization, you can determine where the problem bearing is located. in the gearbox or engine. To replace the bearings, you will need to disassemble the saw blade. How to do this was described above.

If during the operation of the unit, extraneous noise is not heard, and the engine still develops speed and power poorly, then pay attention to its manifold. You can usually see a circular spark (ring of fire) on it. This can be due to the turn-to-turn closure of the armature coil or the accumulation of dirt between the collector lamellas.

Open the motor housing and carefully inspect the manifold (the place where the brush electrodes slide). It consists of parallel strips (lamellas). There is a small gap between them. When this gap is clogged with conductive graphite dust formed during brush wear, a short circuit occurs between the lamellas, and a burning ring appears around them.

change, circular, blade

The problem will be solved by replacing worn brushes and cleaning the gaps between the lamellas with a toothbrush, cotton wool and alcohol, followed by polishing the plates with fine sandpaper.

In some cases, a power drop can be caused by a faulty start button. If a tester check has confirmed its failure, then the part should be replaced with a new one, since it cannot be repaired.

The saw stops during operation

In most cases, engine shutdown is caused by worn-out electric brushes. When the contact between the brush electrode and the collector lamellae is broken, the unit turns off.

Often, when buying brushes for this device, you come across products with a short conductor connecting the electrode to the plate. This conductor is located inside the spring and does not allow it to fully unclench. When the electrode wears out to a certain length, then pressing it to the collector stops, since this is prevented by a short conductor. If, while inspecting the brush, you find that it is not yet worn out and the spring does not expand, then the part should be replaced.

The gear case is very hot

Rapid heating of the gearbox occurs if the shaft bearing has become 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 noise in this unit of the device. It is necessary to disassemble the gearbox and change the bearing. Also, the gearbox will warm up if there is not enough lubricant in it or it is completely absent.

Brushes are burning

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

Major malfunctions and their symptoms

Typical malfunctions of hand-held circulars include the following situations.

  • The saw does not start. The mains cable, electrical plug, start button or electric brushes may be defective.
  • The engine of the instrument is very hot. Such symptoms may be the result of an inter-turn short circuit (breakage) in the armature or stator coils, as well as an excessively intensive mode of operation of the unit.
  • The gearbox of the device is overheating. Overheating of this unit may occur due to bearing failure or lack of lubrication on the gears.
  • The brushes sparkle. This is usually due to excessive wear and tear.
  • A burning ring is visible around the engine manifold. If, during operation of the unit, a circular spark is observed around the engine manifold, then its appearance can cause a malfunction of the armature winding or clogging of the space between the lamellas of the collector with graphite dust.
  • The unit does not develop the required power. The drop in power may be due to a drop in voltage in the network, malfunction of the motor windings, wear of the electric brushes, malfunction of the start button.
  • During the operation of the unit, grinding and other extraneous sounds are heard. These symptoms can be caused by broken gear teeth or bearing malfunction.
  • The engine is humming but the unit is not running. A jam may have occurred in the gearbox.

Tool disassembly

Almost all malfunctions of electric circular saws cannot be eliminated without disassembling the device partially or completely. Complete disassembly of an electric hand saw using the example of an Interskol unit is carried out in the following order.

  • Unscrew the angle and depth adjusting screws attached to the foot of the machine.
  • Press the gearbox shaft stop button and use the hex wrench to unscrew the bolt holding the saw blade.
  • Pulling the lower guard to the side, remove the circular disc.
  • To remove the support sole, first unscrew the fasteners on its underside.
  • Next, using two screwdrivers, remove the Sieger ring, which locks the rod on which the sole turns, to change the angle.
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Insert a screwdriver into the gap between the body of the shield and the sole, then push it aside and remove.

How To Change Circular Saw Blades

  • In the next step, unscrew all the fastening screws located on the upper casing of the unit.
  • Also remove the screws holding the movable saw guard.
  • Disconnect both protective covers from the saw.
  • Using an open-end wrench, unscrew the bolt holding the riving knife and remove it.
  • Unscrew the stem holding the movable casing mechanism and disconnect all its elements.
  • Next, disconnect the unit’s gearbox by unscrewing 2 screws.

  • When the mechanical part of the device is disassembled, you can start disassembling the electrical part of the device. Unscrew the fastener holding the engine cover and remove it.
  • Removing the cover reveals two electric brushes. If they need to be completely disconnected from the engine, it is recommended to use a marker to mark one of them, as well as the place from where it was taken.
  • Next, you should unscrew the screws with which the motor housing is attached to the gearbox housing.
  • After unscrewing the fasteners, disconnect both nodes.
  • In the detached part of the motor housing, you will see the stator coil.
  • Next, you should unscrew all the fasteners from the handle of the unit. But before disconnecting it, you need to remove the rubber pad by prying it with a screwdriver.
  • Removing one half of the handle, you will see the soft start module and the start button.

    change, circular, blade

    This concludes the complete disassembly of the circular saw.

    Shaft jammed during operation

    This malfunction can occur when, for any reason, the stopper is pressed while the tool is running. It is designed to secure the shaft when changing tooling and should be used after the motor has come to a complete stop. Otherwise, the stopper rod will break and debris will enter the engine, causing seizure. There are often cases when this leads to deformation of the armature shaft. Also, a consequence of pressing the stopper can be a split in the gearbox housing, the fragments of which can damage the gears and cause them to jam. To solve the problem, you will need to replace the armature, stopper, drive (large) gear of the gearbox and its housing.

    In some cases, the gearbox can jam when the bearing is completely destroyed.

    DIY circular saw repair

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

    design

    The design of the circular saw is simple and therefore, perhaps, so easy to use. It consists of:

    • electric motor;
    • saw blade;
    • a body that has one or two handles;
    • a protective cover that covers the disc from above and below (the lower part is movable and automatically removed during operation);
    • A platform that allows you to install and hold the drive in the right place;
    • wedge-shaped knife that prevents the disc from getting stuck in the forest.

    The saw blade is attached with one or more screws to the motor shaft. Thanks to this, replacing the disk takes a few minutes. You just need to unscrew one or more bolts, remove and place the disc, putting the fasteners in place.

    The structure may be slightly different: instead of a battery, there is usually an electric cable

    The electric motor is attached to the platform. On more expensive tools, this mount is movable, which allows you to change the cutting angle. This angle is usually between 0 ° and 45 °. It differs from different manufacturers. Most often there is a scale with fixing screws. The angle is set, the screws are tightened, which gives the cutting blade a certain tilt.

    What can i cut

    Use circular saws for ripping and cross-cutting wood. as lumber (boards, boards, rods), as well as wood and logs. But you can work with logs not by hand, but with a stationary circular saw. Chainsaw is most likely suitable for hand tools.

    Circular or circular hand saws. one of the most versatile tools

    In addition, the hand-held circular saw can cut any sheet material. fibreboard, chipboard, OSB, plywood. By changing the disc, you can dissolve the sheet metal (profiled and smooth), you can see the rebar and other metal products. It is also possible, with the right choice of disc, to cut ceramic and some types of paving slabs, plastic products, slate, drywall profiles, non-ferrous metals. A truly versatile tool loved by many craftsmen.

    The only work that is not advisable to do with this tool. is to cut the metal tile. Any manufacturer must point out that the use of circular saws is unacceptable, otherwise the material will be removed from the warranty. The fact is that many hot sparks fly at work, which burn out the layer of paint. As a result, after a few months on the surface, in those places where the layer of paint was burnt, there are several rusty spots. The rust then spreads rapidly throughout the roofing material. Therefore, hand-held circular saws must be used. For this job, metal scissors are more suitable. manual and electric.

    The gear case is very hot

    Rapid heating of the gearbox occurs if the shaft bearing has become 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 noise in this unit of the device. It is necessary to disassemble the gearbox and change the bearing. Also, the gearbox will warm up if there is not enough lubricant in it or it is completely absent.

    READ  How to Change Brushes In a Bosch Screwdriver

    Shaft jammed during operation

    This malfunction can occur when, for any reason, the stopper is pressed while the tool is running. It is designed to secure the shaft when changing tooling and should be used after the motor has come to a complete stop. Otherwise, the stopper rod will break and debris will enter the engine, causing seizure. There are often cases when this leads to deformation of the armature shaft. Also, a consequence of pressing the stopper can be a split in the gearbox housing, the fragments of which can damage the gears and cause them to jam. To solve the problem, you will need to replace the armature, stopper, drive (large) gear of the gearbox and its housing.

    In some cases, the gearbox can jam when the bearing is completely destroyed.

    The saw stops during operation

    In most cases, engine shutdown is caused by worn-out electric brushes. When the contact between the brush electrode and the collector lamellae is broken, the unit turns off.

    Often, when buying brushes for this device, you come across products with a short conductor connecting the electrode to the plate. This conductor is located inside the spring and does not allow it to fully unclench. When the electrode wears out to a certain length, then pressing it to the collector stops, since this is prevented by a short conductor. If, while inspecting the brush, you find that it is not yet worn out and the spring does not expand, then the part should be replaced.

    Extraneous sounds appeared during operation

    Grinding and other abnormal sounds can cause faulty bearings or gear and shaft gears with worn or broken teeth. In the following figure, the arrow shows where the armature gear is.

    The gear located on the motor shaft can come off when the saw gets stuck in hard or loose wood. Usually, the gear wheel does not suffer in this case. To eliminate this damage, you will have to completely change the engine anchor. In the event of bearing breakdowns, they can be easily removed with a puller and replaced with new ones.

    Disc types

    The size of the discs mounted on the tool depends on the thrust power of the electric motor. A slightly smaller size can be set, but more undesirable: working with overload quickly disables any tool.

    But size isn’t everything. Each disc has teeth. These teeth have different shapes, heights, and are located at different distances. Here, according to these parameters, the cutting element is selected for each type of material.

    Discs supplied with different number of teeth

    How to replace a circular saw blade?

    Are you looking for information on an older SKIL model or you need an operating manual for a SKIL tool?

    Electric circular saw: how to choose and work

    There is a small tool that is more versatile than circular saws (also called hand-held circular saws). For what they don’t use: cutting wood, metal, plastic, slate, Fiberboard, Particleboard and other similar materials. Replace disc, polish or polish, put on brush, remove rust. Therefore, the tool is always useful when building a bath or a house.

    We call circular saws because of the shape of the cutting element, which is made in the form of a disc with a cut edge. The dimensions of the disc, the material of which it is made, the shape and parameters of the teeth, the power of the electric motor. here are the main parameters by which the tool is selected.

    Removing and replacing the disc on a circular saw

    Due to the competition in the market, the choice of electrical tools is constantly increasing, and are becoming more affordable. Now women are happy to give them to men on February 23rd, or relatives and friends for their birthday. Almost every second household man has his own circular circular saw.

    Over time, the circles fail (dull or break), they must be replaced depending on the material with which you need to work. For example, you cannot cut wood with a metal cutting blade. Therefore, the ability to correctly and quickly remove the disc, put a new one is necessary for everyone.

    How to remove a blade from a circular saw?

    To properly remove the canvas, you need to adhere to the following sequence:

    • For your own safety, be sure to disconnect the power cord from the mains or remove the battery
    • For a more convenient replacement, it is required to install the tool on a flat, hard surface
    • To start unscrewing the bolt, you must press the locking spindle, which blocks the rotation of the disc when unscrewing
    • Unscrew the bolt using the special wrench included in the kit
    • Pull out the bolt and remove the washer holding the saw blade
    • Move the lower guide arm to raise the guard
    • Remove the saw circle

    How to change a circular saw blade?

    The new canvas must be installed in the following sequence:

    • Clean the pulley and protection from accumulated dirt, sawdust.
    • Check the correct direction of the saw teeth in accordance with the arrow on the guard.
    • Put the blade on the pulley and lower the lower protective shield.
    • Install the retaining washer and tighten the bolt. Tighten it again with the recessed locking spindle.

    Washer for circular saw?

    A flange or washer holds the disc securely in place. On various saw models, both a flange separate from the bolt and soldered to it are used.

    The main function of the hold-down washer is to evenly press the saw blade against the pulley. A correctly installed washer must sit symmetrically on the circle.

    The main and main rule when replacing a blade on a circular saw is to completely disconnect the tool from the power supply. To avoid accidentally injuring yourself with the saw teeth, it is best to use gloves.