How to sharpen a circular saw for wood
Grinding machine for circular saws and end mills from Paoson WoodWorking
General rules for sharpening a circular saw
- First of all, the main edges are processed, of which the front wears out more.
- In extreme cases, with severe wear of the side faces, they are corrected.
- At a time, remove no more than 0.15 millimeters of the saw metal thickness.
- When finishing the edges with an electric tool, overheating of the metal is not allowed, in which case its properties deteriorate.
- To ensure the maximum service life of the saw, when it can be sharpened up to 30 times, both edges should be sharpened: both the front and the back, removing the same amount of metal.
- It is not allowed to sharpen circular saws with tools that are not intended for this, for example, a grinder and a disc for cutting metal.
After carrying out the basic sharpening operations, you can finalize the teeth with fine sandpaper. The quality control of the sharpening of the tool takes place in working conditions. If everything is in order, the cutting of the material will be clean, smooth, without visible defects and blackening.
Do it yourself sharpening at home
Attention! To sharpen circular saws with your own hands, it is desirable to have certain skills in sharpening the tool. If there are none, at least practice on emery, sharpening an ordinary knife.
When working with a disc, the main thing is not to spoil the cutting surface, and this can easily happen if the hand trembles, the feed angle is violated. In order to avoid negative consequences, you should study the sharpening methods, and then everything will turn out right. Distinguish between a manual method of restoring cutting elements of a circular saw and a method using sharpening equipment.
Sharpening a circular saw on an electric grinder on a homemade device (part 1)
Tool at work: How to sharpen a circular saw with
Using water for cooling can lead to rust on machine parts and components. To eliminate corrosion, water and soap are added to the water, as well as some electrolytes (sodium carbonate, soda ash, trisodium phosphate, sodium nitrite, sodium silicate, etc.), which form protective films. For conventional sanding, soap and soda solutions and fine sanding are most often used. low concentration emulsions.
However, when grinding saw blades at home with low intensity grinding work, the wheel is often not used to cool the wheel. not wanting to waste time on it.
To increase the grinding ability of abrasive discs and reduce specific wear, select the largest grain size that provides the required surface cleanliness of the sharpened tooth.
To select the grit size of the abrasive according to the grinding stage, you can use the table in the article on grinding rods. For example, if you are using diamond wheels, you can use 160/125 or 125/100 grit wheels for roughing. 63/50 or 50/40. Wheels with grit sizes from 40/28 to 14/10 are used to remove teeth.
The peripheral speed of the wheel when sharpening carbide teeth should be about 10-18 m / s. This means that when using a circle with a diameter of 125 mm, the engine speed should be around 1500-2700 rpm. brittle alloys are sharpened at a lower speed from this range. When sharpening carbide tools, the use of hard mods leads to the formation of increased stresses and cracks, and sometimes to grinding of the cutting edges, while the wear of the wheel increases.
When using saw blade sharpeners, the relative position of the saw blade and the grinding wheel can be changed in different ways. movement of one saw (the motor with the wheel is stationary), the simultaneous movement of the saw and the engine, only the movement of the motor with the wheel (the saw blade is stationary).
A large number of grinders of various functions are produced. The most complex and expensive programmable complexes are capable of providing a fully automatic grinding mode, in which all operations are performed without the participation of a worker.
In the simplest and cheapest models, after installing and securing the saw in a position that provides the required sharpening angle, all further operations. turning the saw around its axis (turning on the tooth), feeding for grinding (contact with the wheel) and controlling the thickness of the metal removed from the tooth. are made by hand. It is advisable to use such simple models at home when the sharpening of circular saws is episodic.
An example of the simplest machine for a grinding system, a photo of which is shown in the photo below. It consists of two main units. motor with circle (1) and support (2), on which the sharpened saw is installed. The rotating mechanism (3) serves to change the blade angle (when sharpening the teeth with a beveled front plane). The screw (4) moves the saw along the axis of the abrasive wheel. This ensures that the set value for the front grinding angle is set. The screw (5) is used to set the stopper in the desired position, preventing excessive penetration of the circle into the interdental cavity.
How to sharpen a circular saw blade correctly
Saw blades must be sharpened regularly to avoid damage to the building material. We will tell you how to properly sharpen a saw blade with and without solders, what equipment and tools to use.
The disc tool for sawing wood is always useful in construction. The circular saw is convenient in that it allows you to quickly cut the material with minimal effort and time. As for the quality of the cut, we can say that it is perfect, but only when the saw is in good working order and well sharpened. Otherwise, it is even dangerous to work with such a tool, so you should sharpen the circular saw.
It is not difficult to determine the need for a sharpening operation: a blunt tool cuts the workpiece poorly, which immediately catches the eye. There are two options here: either send the disc to the workshop, which is not always beneficial in terms of time and money, or sharpen the circular saw with your own hands. This may seem daunting at first glance. But if you delve into the essence of the saw device in more detail, it will not be difficult to perform maintenance of the tool at home.
Grinding angles of teeth
The values of the grinding angles are determined using a saw. those. one for cutting the material and in which direction it is intended. Rip saws have a relatively large rake angle (15 ° to 25 °). In cross-cut saws, the γ angle usually ranges from 5-10 °. Versatile cross and rip saws have an average rake angle. usually 15 °.
The values of the grinding angles are determined not only by the cutting direction, but also by the hardness of the saw material. The higher the hardness, the smaller the front and back angles (less tapering of the tooth).
The rake angle can be not only positive, but also negative. Saws with this angle are used for cutting non-ferrous metals and plastics.
The main sharpening angles of circular saws
The front face, the one that first cuts into the workpiece in the direction of the saw movement, forms the main cutting edge with the rear face. The angle at which the leading edge meets the material is called the Y-angle (angle of attack). The angle between the back face and the front face is the taper angle. If you subtract the rake angle and the taper angle from 90 degrees, you get the clearance angle.
In practice, it is important to observe these angles when sharpening for each type of disc. It is according to the front angle that the saws are divided into types:
- Longitudinally cutting, where the rake angle must not go beyond 15-25 degrees.
- Transverse cutting, where it is permissible to sharpen the front face of the tooth at an angle of 5-10 degrees.
- Universal discs, which are easy enough to cope with both longitudinal and transverse cuts, their rake angle should be maintained in the region of 15 degrees.
The angle of the bevel of the rear and front planes is also important: the sharper it is, the easier it is for the saw to enter the material, but wear occurs faster.
Follow the rules! When cutting hard wood, the saws must be sharpened so that the taper and bevel angles are as small as possible (within acceptable limits). This extends the life of the blade until the next sharpening.
How to sharpen a saw on wood?
Saw tooth shape for cutting wood.
In order to sharpen a saw on wood, you need to stock up on a file that has 3 edges. A triangular file is required in order to be able to sharpen the teeth. The file should be at an angle in the cutting edge. As for the value of such an angle, it should be between 45 and 60 degrees. To make it more convenient, it is strongly recommended to sharpen the teeth on one side, and then proceed with similar actions on the other side. If you do everything in this way, then, thanks to the same type of movements, the whole process is carried out with greater ease.
When such a process is carried out, certain rules must be observed:
- It is best to do this alone, without interacting with other people. Any background noise must be excluded.
- All careless movements should be avoided, as any of them can not only cause damage to the instrument, but also cause significant harm to health.
- If the saw moves to the side during cutting, this indicates that the setting of the teeth is uneven. This can be corrected by increasing the deflection of the teeth on the side to which the saw is pulling.
How to sharpen a circular saw?
Circular saws sharpening scheme.
If we are talking about a circular saw, then sharpening must start from the rear surface. The whole process is carried out as follows:
- The sharpening of the disc can be carried out directly in the machine, or you can remove the disc from the machine.
- If sharpening is carried out by the first option, then it is necessary to remove the plug from the socket in order to prevent the consequences of starting the machine, and this can always happen.
- The disc must be wedged, for this, thin wooden beams are placed on both sides, they must be pressed against the teeth.
- The marker marks the lateral side of the tooth, from which you should start sharpening. Thus, there will be no mistakes when working.
- A prerequisite for such a process should be extreme accuracy.
How to sharpen a saw yourself without difficulty?
The hand saw is truly one of the most indispensable tools on the farm, but even the best saw dulls over time. Sharpening it yourself is not at all difficult at all, you do not need to have any special skills for this. you just need to strictly follow the recommendations. For sharpening you need the following tools:
Saw Blades & Router Bits Sharpening Jig
Sharpening a hand saw for wood.
- File (flat and round).
Chainsaw and hacksaw sharpening
When it comes to sharpening a chainsaw, then for this you should use 2 files: one round and the other flat.
To sharpen a hacksaw, you need to do the following: you need to take a file of the appropriate size.
How to sharpen your circular saw blades, the easy way.
First, pass them on one side of the hacksaw, then hold the same number of times on each tooth. If necessary, the process must be repeated. Sharpening the saw so that it cuts well is not difficult. You just need to use high-quality materials for this.
The process of setting the saw teeth
Band saw teeth set.
If you need to ensure free movement of the teeth, you need to start setting them. The teeth should be bent in different directions in turn. The distance should be the same and the routing should be used. The tooth must be bent in the middle of its height by setting. If there is no wiring at hand, then an adjustable wrench can be used in this capacity.
- If the saw is not set well enough, it must be diluted first. If you use a specialized wiring for this, then it is not difficult to do this. However, there may not be such a wiring at free disposal, so you can use ordinary pliers for this.
- The saw must be clamped so that its teeth are directed upwards, the whole process along the blade should be visible, this is how all actions should be carried out.
- Every second saw tooth should be bent in different directions, and with each movement, the pliers should tilt at an equal angle.
- If from the very beginning the layout is already present to some extent, then the main task is to increase it. This is especially true for large saws. If the tool is small (such tools are most often used for those works where increased accuracy is needed), then the factory wiring in most cases is quite sufficient.
Now you know the basic nuances of sharpening a saw. Good luck to you!
Mechanized disc sharpening
Materials and tools:
- saw blade;
- disc sharpening machine;
- pendulum goniometer;
How to sharpen a circular saw in a mechanized way? There are many different machines. Some mechanisms have software packages to provide a fully automated turning mode. In a home workshop, when disc turning is occasional, a simpler device can be used.
Saw blade teeth sharpening angles: rake angle (γ), rear (α) and bevel angles of the front and rear planes (ε1 and ε2).
How to sharpen a disc? In such a machine, after its installation and fixing in a position that provides the required sharpening angle, all other operations rotation of the blade around its axis, control of the thickness of the metal removed from the tooth performed manually.
Sharpening a straight tooth along the front plane is performed in the following sequence. Install the canvas on the frame of the machine. Clamped with a centering sleeve. Then, using a mechanism, it is installed in a strictly horizontal position. Thus, the bevel angle of the front plane is ensured equal to zero. If the machine does not have a built-in angular scale, the horizontalness of the disc is checked using a pendulum goniometer.
How to Sharpen Circular Saw Blades – Trend Diamond Sharpening Tips
Then the screw of the mechanism is rotated, which provides horizontal movement of the frame with a circle. The required rake angle is set. The blade moves in a position in which the front plane of each element fits snugly against the working surface of the circle.
A marker is made to mark the first tooth from which sharpening begins. Then the engine is turned on and the front plane is sharpened. The machine brings the tooth into contact with the circle and performs several movements of the blade back and forth while simultaneously pressing the element against the circle.
After sharpening one element, the blade is removed from contact with the abrasive wheel, rotated by one element. Then the operation is repeated in the same way. This is how the machine works until the element marked with a marker has completed a full circle, showing that all elements are sharpened.
Sharpening a beveled tooth differs from straight turning in that the saw is positioned with an inclination equal to the bevel angle of the front plane. To sharpen an element along the back plane, it is necessary that the machine allows the blade to be installed so that the back plane of the element is in the same plane with the surface of the circle.
To sharpen a circular saw on a machine, you do not need to have special skills. Anyone can handle this work if they follow all the instructions and rules for working with disc sharpening machines.
Sharpening saws on wood
A saw for wood is the most important tool in the hands of a specialist, which must work properly and reliably, especially if the saw is correctly sharpened. However, when buying this product, the consumer is not always happy with its pungency. Wood saws are often sold blunt. To a greater extent, this applies to large-toothed tools. Therefore, the issue of sharpening remains relevant for those who wish to achieve efficient saw operation.
It is known that there are different forms of sharpening for each type of work.
- The saw must be parted first if it is not sufficiently parted. It is best to do this using a specialized layout. But if such a part is not at your disposal, then you can use pliers.
- The saw is clamped with the teeth upwards, the operator must operate in such a way that he can see the whole process along the blade.
- Then you need to bend every second tooth in different directions, accompanying each movement by tilting the pliers at an equal angle.
- Often, wiring is already present to a small extent initially. The owner of the saw simply needs to increase it when it comes to raw wood or large saws. If the saw is small and is designed to perform work that requires great accuracy, then the factory wiring is sufficient.
In the process of sharpening a saw on wood, you will need a file that has three edges.
A triangular file is used to sharpen the teeth. This process is carried out from the inner surface in relation to the setting of the saw teeth. The file is positioned at an angle in the cutting edge. This angle should be sixty to forty-five degrees.
In practice, it is much more efficient to first sharpen one side of the teeth, and then, turning the saw over, sharpen them on the other side. Thus, a person makes the same type of movement, which allows you to sharpen the saw faster and more efficiently.
When sharpening saws, it is necessary to follow the most important rules that not only allow you to achieve a higher effect, but also ensure safety. To do this, when sharpening saws, you must:
- eliminate any background noise or communication with other people,
- you should turn off the radio, TV, thus achieving complete silence, creating a situation in which no one can distract you.
Otherwise, any careless movement or reaction of a person to a distracting sound can lead not only to damage to the instrument, but also irreparable consequences, causing damage to human health.
Experts advise you to pay attention when the saw goes to the side during cutting. This indicates an uneven setting of the teeth, which needs to be corrected by increasing their deflection from the side to which the saw is pulled.
Saw Tooth Set
The teeth are set when it is required to provide more free movement of the saw blade. The teeth in turn are bent in different directions at the same distance using a set. With its help, the tooth is folded back approximately in the middle of its height. The setting is a tool for making the saw teeth set, it has the shape of a plate, in which there is a slot.
An adjustable wrench can also be used, which also successfully sets the teeth.
To work with soft woods, the teeth must be set more, in the case of hard ones. less. But this advice is unlikely to be useful to those who work directly in the forest. Under these conditions, the degree of hardness, density and moisture of trees is hardly possible.
In order to choose the right wiring, you will have to test this device in different conditions, the best option would be three tenths to five tenths of a millimeter in one direction. The general requirement is to set the teeth no more than the blade thickness on both sides. It is necessary to do the wiring before sharpening.
How to properly dilute and sharpen a circular disc
Sharpening circular saws
Materials and tools:
Circular saw blades.
- saw blade;
- diamond file;
- thin wooden blocks;
- adjustable wrench.
How to sharpen a circular saw with a disc? The circular saw must be sharpened from the rear when working with the blade facing the tree. The front surface, which is on the material when cutting, remains in the same position.
You can turn the disc in the machine. You can pull the canvas out of it. If turning is carried out in the device, you must remove the plug from the electrical outlet to prevent accidental switching on of the device. It is necessary to glue the product by placing thin blocks under it on both sides and press them down to the teeth.
It is necessary to mark with a marker the element from which the turning is started. When turning, care must be taken and maximum care must be taken. Turning is performed with a file or diamond file.
It is necessary to remember the number of movements and applied forces when turning the first tooth. The same effort should be applied when turning the remaining parts. If the blade is removed from the machine, you need to clamp it in a vice, then sharpen each tooth in the same way. Then the web is installed back into the device.
Check the cut on the sample. If there is noise during operation or the material feed is uneven, check the tine height. To do this, bring the marker to the cutting edge. Then you need to slowly turn the canvas by hand 1 turn in the direction opposite to the direction of rotation. In this case, a mark will appear on each tooth. On examination, you can find out which elements are higher than the rest. If the difference turns out to be significant, you need to carefully reduce the height of the elements.
Sharpening and setting the saw
The main cutting element of any hand saw. a series of teeth cut into the blade and representing wedge-shaped cutters. Wood, in the manufacture of all kinds of products from it, is sawn along, across and at an angle Θ to its fibers, in this regard, transverse, longitudinal sawing and sawing at an angle to its fibers are distinguished and in each case use the appropriate type of saw, which differs from others in shape teeth.
and. cross cutting; b. longitudinal sawing; 1.wood; 2. saw cut; 3. line marking for sawing; Θ. the angle of inclination of the marking to the wood grain with mixed sawing.
When transverse sawing, transverse saws are used, the cutting edges of the teeth of which, when moving in the wood, cut its fibers like a knife and form a cut. Longitudinal sawing differs from transverse sawing in that the direction of movement of the saw is parallel to the grain of the wood. The leading edges of the rip saws cut the wood like knives in a plane, and, going deeper, form a cut. When sawing wood at an angle Θ, universal (mixed) saws with teeth that are an intermediate form of teeth for cross and longitudinal saws are used to its fibers.
How to sharpen a circular saw
- Sharpening circular saws
- How to set the disc teeth
- Mechanized disc sharpening
How to sharpen a circular saw? Circular saw it is a necessary tool in the construction of a summer cottage. It surpasses other types of saws in terms of its accuracy and cutting quality. The duration of the structure’s operation depends on the quality of its sharpening.
The service life of the circular saw depends, among other things, on the quality of its sharpening.
An unsharpened disc increases the load on the mechanism. As a result, it can break.
Periodic sharpening of circular saws is required.
Signs that indicate that the saw needs to be sharpened:
- when cutting, a heavy load must be applied;
- the edges of the cut burn;
- the engine overheats;
- smoke appears during operation.