How to remove a blade from a circular saw

The device and principle of operation of a circular saw

A hand-held circular saw differs from a miter saw in the absence of a bed with a rotary table, as well as in the placement of the handle. But in general, both models are similar in internal structure, principle of operation and do not differ in the complexity of the design. The following figure shows the device of a hand-held circular saw.

The unit includes the following main elements.

  • Upper protective casing with an opening for ejection of sawdust.
  • The housing, which houses the electric motor and the start button. Some models of electric saws can operate on rechargeable batteries. In this case, the battery pack is also located on the case.
  • Lower (movable) protective cover that automatically closes the cutting element after it leaves the workpiece.
  • Saw blade. Fastened to the gearbox shaft with a nut or bolt.
  • Parallel stop. Allows you to make an even cut without the use of additional devices.
  • Base plate (base) of the unit. Thanks to it, the tool is installed on the workpiece or tire at different angles.
  • Depth adjuster. It can be used to adjust the overhang of the saw blade relative to the base plate.
  • Sole angle adjuster. Allows you to tilt the unit for cutting at an angle.

This tool works according to the following principle. Mains or battery power is supplied to the start button, which breaks the circuit. When you press the start button, the current begins to flow to the electric motor. Below is the wiring diagram of the unit.

The electric motor starts and transfers the rotary motion through the gearbox to the saw blade. The unit is installed using a soleplate on a workpiece or a guide rail, after which the process of both longitudinal and transverse sawing is performed.

Customer feedback on safety measures when using the tool

Specialists and DIYers especially emphasize that when using power tools, follow the safety instructions. The work area must be clean and well lit when using the machine. If it is cluttered or poorly lit, it can lead to accidents.

An electric machine, as consumers emphasize, cannot be used in an explosive atmosphere, this applies to cases where flammable gases, liquids or dust can be nearby. This recommendation is due to the fact that an electric machine acts as source of sparks, which can ignite vapors or dust. The Interskol Circular should be used with plugs that fit the jacks. Do not modify the plug yourself.

For ground drive vehicles, you cannot use adapters. The risk of electric shock to a person is increased if there is contact with grounded surfaces, namely:

How to replace a circular saw blade

If you do not know how to replace a circular saw blade I suggest watching this video. Disk replacement.

What are we for?

Saw blades are used for cutting various materials. They will help you to cut:

There are also circular saw cutters. With the help of such a disk, you can cut grooves or other types of grooves of the required size in any material. These fixtures make any repair quick and easy. The range of woodwork performed with circular saws and discs is extensive and in demand. After all, with a saw blade you can cut material of any size and shape.

Thanks to the electric motor and high power, the tool with a cutting blade can perform the necessary work for a rather long time. However, for the rational use of time and effort, it is necessary to take into account the features of the operation of this unit.

The most important indicator of a quality application is the correct choice of the saw blade. To do this, you need to know the basic properties, types of this nozzle and the rules for its use with various materials.

How to cut a board / lining across with a circular saw

First, the saw line is marked on the board. If you don’t need high precision, you can mark with a pencil, and cut directly along the mowing line. If it is necessary to match up to a millimeter, then the line is drawn with a knife blade, and the cutter is launched along this mowing line.

Then the board is fixed on the trestle, pressed by the knee. The circular saw is brought to the cutting site, the distance to it is at least 10 mm. The saw is advanced to the drawn mowing line. Aligning the teeth with a line, turn on the electric saw and bring it to the edge, smoothly leading along. Towards the end of the cut, slow down a little, then finish off the remaining distance with one smooth jerk. This avoids the chipping that sometimes occurs when cross-cutting.

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How to cut across a board with a circular saw

To keep the cutting line perfectly straight, you can use the guides. A large square is suitable for this. With its long side, it is abutted against the edge of the board, against the short side, below the edge, the saw platform is pressed. This whole structure is moved along until the line of the disc coincides with the marked line. Then the tool is turned on and the cut begins. With this method, it is easier to control the direction: you only need to press the edge of the platform against the square.

We use a guide when cutting boards. a metal square

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.

DeWalt Circular Saw Blade Installation, Removal, Replacement: Shown on Cordless DCS393

Saw won’t start

If, when pressing the start button, the engine of the unit is “silent”, then the first thing to focus on is the power cable, provided that there is electricity in the outlet (plug the device into another outlet to check).

To check the electrical cable, you need to disconnect the handle. This will help you get to the pins where the power cord wires are soldered. Next, use a tester to ring each wire by pressing one probe to the soldered contact, and the second to the pin of the plug.

How to Remove Saw Blade With No Spindle Lock

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

  • Test the entire circuit with a tester, starting from the cable entry into the unit to the start button. You should also check the contacts of the button at its input and output when the key is pressed. In the normal state, the broken circuit should be closed. Ring all the wires after the button, going to the motor brushes.
  • If everything is in order with the conductors, check how much the brush electrodes are worn out. When the electrode is worn out by 2/3 of its original size, it should be replaced. Brushes, no matter how worn out each of them, change in pairs.
  • If the brushes are in good condition, then, most likely, the engine is out of order. An open circuit or an interturn short circuit could occur in its windings. In this case, it is better to entrust the engine repair to specialists who will rewind the stator or armature coils.

What are we for?

Saw blades are used for cutting various materials. They will help you to cut:

  • steel;
  • soft metals;
  • wood;
  • Fiberboard, Particleboard;
  • plastic.

There are also circular saw cutters. With the help of such a disk, you can cut grooves or other types of grooves of the required size in any material. These fixtures make any repair quick and easy. The range of woodwork performed with circular saws and discs is extensive and in demand. After all, with a saw blade you can cut material of any size and shape.

Thanks to the electric motor and high power, the tool with a cutting disc can perform the necessary work for a rather long time. However, for the rational use of time and effort, it is necessary to take into account the features of the operation of this unit.

The most important indicator of a quality application is the correct choice of the saw blade. To do this, you need to know the basic properties, types of this nozzle and the rules for its use with various materials.


Carbide teeth are considered more reliable because they are stronger and do not require constant sharpening and patching. These scoring discs have the widest range of options and help you save time thanks to their reliability. However, a significant drawback is the large number of low-grade counterfeits, even of famous brands. In such a product, the soldered ends quickly fly off. After 5 minutes of cutting the cross-sections, only a few remaining blades on the disc can be seen.

But counterfeit can also be successfully combated if you pay closer attention to the correct spelling of the brand, as well as the high quality and durability of the paint with which the marking is made.

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If the technical specifications are printed on stickers or the ink starts to creep when touched, you should not take such a product, it is a fake. In addition, branded wheels with carbide teeth are quite expensive, which cannot be said about handicraft (clandestine) products.

Main settings

Consider the most important characteristics of the discs, which will allow you to choose the necessary attachment from a huge modern assortment.

  • Manufacturing company. Manufacturers of such attachments are often specialized tool manufacturing enterprises. Therefore, firms may pay less attention to the quality of components, focusing on technology. But the same cannot be said about well-promoted brands such as Bosch or Makita, which not only value their reputation, but also have the opportunity to use better quality raw materials and modern processing technologies. Therefore, one of the main parameters of saw blades and milling cutters is the brand.
  • The next important parameter that determines the capabilities of the sawing nozzle is the size of the circle, or rather, its outer and bore diameter. When evaluating this criterion, it is necessary to worry about the calculations in advance and clarify the required cutting depth, which will become the measure of the outer diameter. But when choosing, it is also necessary to remember about the size of the tool and its protective casing. These dimensions can make it impossible to install a large diameter disc, since removing the protection is unsafe and not always possible.

The rim must be identical to the size of the shaft. This is necessary for the correct operation of the equipment and the absence of overheating of the circular saw motor.

This is possible if the inner diameter of the disc is larger than the circumference of the shaft. Indeed, after attaching the disc, it will create an imbalance in the tool and, as a result, a high level of vibration. Depending on the tool model, the diameter can range from 16 to 32 mm.

  • The number of teeth plays an important role in the quality and precision of the cut, since it determines the number of cutting edges. The more of them, the clearer the line was cut. Such nozzles are available with a large (about 90 pcs.), Medium (40-80 pcs.) And small (up to 40 pcs.) Number of teeth.

Medium-type discs can rightfully be called universal. They can cut almost any material both horizontally and vertically. Both hard and soft types of materials lend themselves to cutting.

  • When considering saw blades, you can also highlight such criteria as the shape and angle of inclination of the tooth. The first is responsible for the ability to cut a particular material, and the second. for the type of cut. So, it is easier to perform longitudinal cuts with a disc with a positive slope of 15 to 20 degrees, and it is better to cut dense materials with a nozzle with a negative slope from 0 to 5 degrees. There is also a standard tilt type that is considered universal.
  • As for the teeth of the disc, they can be universal, flat, replaceable, have the form of a trapezoid or an increased inclination. A blade with a flat cutter is good for side cuts in hard types of wood, with a replaceable one for cutting softer types of wood and Fiberboard. Trapezoidal teeth cleanly cut soft materials such as plastic.

The teeth with an increasing slope are used for products that can easily split during operation. Universal ones are used in almost any case. They are great for occasional non-specialist home use.

  • And the last important criterion is the thickness of the product. It depends on it how wide the cut will be. The wider it is, the more material is lost in the process. The thinner the disc, the more it is susceptible to deformation and overheating.

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

Saw blades are divided into two types: carbide and monolithic. This division describes a difference that is immediately apparent. The fact is that on some discs the cutting part is soldered to the teeth, and some are simply a single product (monolith).

How to choose?

In order to make the right choice, when buying a disc, you must take into account:

  • circular saw specifications;
  • all markings;
  • the appearance of the teeth;
  • type of disc;
  • type of material for sawing.

In order not to be mistaken when choosing a saw blade, it is necessary to take into account not only the compliance of the blade size and the protection of the tool. The power of this unit is also important, as well as the tendency to overheat. The speed of work and the number of stops to cool the saw depend on these parameters.

Disc marking will give the most comprehensive information about its properties and capabilities.

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Another criterion that can directly indicate the quality of the product is the number of teeth. The more of them, the higher the quality of the cut. Discs with sparse teeth can do most of the roughing work, but at a much higher speed. Therefore, you need to correctly evaluate the desired result.

remove, blade, circular

When making an independent choice without the help of a sales assistant, it is important not to confuse products for pendulum saws and circular saws. Such circles can only be distinguished by the type of inclination of the teeth. Discs with a neutral and negative tilt do not grip the material well, they clog quickly and do not make the required cut. In this case, the force of the motor can lead to overheating. For a circular saw, blades with an aggressive positive angle of inclination are more suitable, if the sawing product does not dictate otherwise.

Consider special cases of using saw blades.

  • Straight toothed accessory selectable for rough woodworking.
  • For Concrete Saw and Cement Particle Board (Cement Particle Board) use a flat-toothed and chamfered nozzle as they easily tolerate being hit by concrete or nails in the grooves.
  • For work on laminate and laminated chipboard, a disc with a series of concave triangular teeth is perfect. It will help you make a cut without prior marking.
  • For soft metals such as aluminum, a circle with alternating trapezoidal and flat teeth will work best.
  • When working on plywood and fibreboard, it is better to use the universal nozzle.
  • As for heavy decor, a diamond wheel must be used for manual cutting on materials such as stone.

Features and selection of circular saw blades

When the word “saw”, most people who independently carry out repair work around the house have an image of a hacksaw. And this is true, because such works once began with her. However, progress has made great strides forward, and now the best assistant in repairs is a circular electric saw. It significantly reduces labor costs and increases the speed of work. With this tool, you can cut various surfaces and materials.

remove, blade, circular

But for its functioning, nozzles are vital, without which cutting is impossible. These attachments are called saw blades.


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 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.

remove, blade, circular
  • 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.