How To Sharpen A Wood Saw Correctly

Chainsaw and hacksaw sharpening

If we are talking about 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.

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.

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 the same 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 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:

Sharpening a hand saw for wood.

  • File (flat and round).
  • Pliers.
  • Sharpener.
sharpen, wood, correctly

If the saw is sharpened correctly, then there is no doubt that it will function properly. However, saws that are designed for woodworking not only become dull over time, but often go dull on sale. This situation is especially true for those tools that have large teeth. Thus, for those for whom the efficiency of the saw is an important issue, sharpening must be taken care of in advance.

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.

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 with the 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 specialized wiring for this, then this is not difficult to do. 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!


An electric or gasoline chain saw uses the chain as a contact cutting surface. It is sharpened in workshops using industrial equipment or do it yourself using a template. In the latter case, round (cylindrical) files with a small diameter are used, which are selected depending on the marking of the sharpened product.

In particular, the Stihl MS brand chain from 180 to 250 will require a file with a diameter of 4 mm, for MS 290 and further up to 440, a tool with a diameter of 5.2 mm is required.

The round file only moves forward and nothing else. Direction perpendicular to the chain plane. In addition, when sharpening chains, a flat file and a template are also used, after installing the template on the tooth, the cutting surface is sharpened.

Before starting work, the tire is clamped in a vice. However, the use of a machine in such a case is still preferable, although there are opposite opinions. If the wear is small, the matter can be corrected in manual mode, but we must not forget about the geometry of the cutting part.

With severe wear, machine tools are necessary. Complex equipment has a tuning system that allows it to work automatically.

It must be borne in mind that different chains differ in the shape of the teeth, therefore the tool used must correspond to this.

General rule: teeth through one are first sharpened in one direction, after which the saw turns in the opposite direction and the operation is repeated.

For manual sharpening of chain saws, the tool is sold in sets. When choosing it, you need to understand well which chains will have to sharpen. If in the course of solving the problem you have to choose between engine power and chain sharpness, you should prefer the latter.


Any wood saw works very efficiently if it is regularly checked and sharpened. Manual model can be sharpened by hand.

By the way, this way you can sharpen not only a hacksaw or a chain saw, but also a circular saw, which has found wide application in woodwork.

The machine is a good solution, however, if only a manual version is possible, the procedure will look like this. First you need to fix the product on a stand that will rotate. Mark the corners with a marker. The template can be a standard disc, taken “on the side” or previously purchased in pairs. If there is none, you will have to take care of your own hardboard template in advance.

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The gang saw is a tool commonly used in sawmills. It serves for longitudinal cutting of wood into boards and beams. Its peculiarity is that the saws are rigidly connected in the form of a frame.

The undoubted advantage of the design is its high performance. When sharpening, it is necessary to take into account the parameters of the teeth, which are usually selected for interaction with a specific material.

Sharpening gang saws is considered more difficult than conventional similar tools for wood.

Extra strong material must be used. The automatic machine copes well with the task at hand, the grinding wheel moves at a certain interval. It is important to maintain the correct angle and avoid mechanical damage.

The width of the set of teeth for sawing fresh coniferous wood should not exceed 0.8 millimeters, the same figures for oak or beech. 0.6 millimeters. The operation is carried out industrially, the grinding material is corundum.

At the end of the work, grinding is carried out. Gang saws are more difficult to sharpen because the material to be ground is not the same for different teeth. Both the front and back of the teeth are sanded.

What tools are needed?

Various types of saws make their own adjustments to the list of tools used for sharpening. For a regular hacksaw, a triangular file is required, needle files are also used.

In addition, you will need a clamping device, for example, a vice, or you will have to make a special device yourself. In this case, bonded plywood sheets are used, between which the canvas is clamped. In this case, the teeth should protrude slightly above the surface.

A circular saw will require a pair of wooden blocks, self-tapping screws, a marker, a screwdriver, a jigsaw or a hacksaw, a ruler.

An industrially manufactured machine is used if the process is more complicated, for example, when sharpening chain, frame cutting surfaces or if there are several saws. A grindstone is used as a working tool.

Chainsaw attachments are used in conjunction with a special rail, which is used to sharpen while rotating. Sharpener, rhombic stone, circle, disc. these are the forms and types of sharpening tools.

Machine tools, in turn, are divided into electrical and mechanical, the latter are driven only by muscle power. The most sophisticated and expensive electrically driven options allow the operation to be carried out automatically, turning the grinder into a regular machine operator.

Sharpening signs

The first sign that a regular saw needs to be set and sharpened is to move away from the mowing line or to clamp it in the material. A sharp chain saw allows for effortless cuts, while high heat combined with too small chips signals the need for adjustments. Experienced technicians can determine the need for sharpening by changing the sound.

Circular saws also heat up, build up deposits and become more difficult to move.

The chain saw dulls extremely quickly after hitting the ground. Its further use leads not only to an increase in muscle efforts, but also increases the load on the units of a gasoline or electric saw.

The chain may vibrate, fuel consumption will increase, and overall efficiency per unit of time will be significantly reduced. The size of the detached shavings will resemble flour.

The appearance of smoke during the operation of a circular or circular saw and heating of the protective cover, chips and irregularities along the edges of the cut indicate the need to sharpen.

Deformation of the teeth can be determined visually. Thus, the urgency of the operation will be indicated by a general decrease in labor productivity, a decrease in accuracy, a change in the nature of the sound, rounding of the tops of the teeth, the withdrawal of the tool from the mowing line, and the use of large physical efforts.

How to sharpen correctly?

The tool sharpening process is quite simple. The blade is clamped in a vice and the teeth are sharpened alternately. First, this is done on one side, and then, turning the canvas over, the manipulations are repeated. Movements should be extremely accurate and monotonous.

Sharpen the saw from the inside towards the setting. Naturally, in this case, it is necessary to observe precautions by wearing special gloves. It is recommended to evaluate the result with the help of “control sawing”. The difference “before and after” should be significant: the resulting cut is smoother, much less effort is made.

Each saw tooth can be viewed as a small knife, and in the case of a chain saw, as a small plane that enters the material at different angles depending on the technological purpose of the tool.

Teeth can be straight and oblique, trapezoidal or conical. Oblique. the most common, conical, as a rule, perform auxiliary functions, in particular, they are used for cutting laminate.

In any case, the result should be the same: the hand tool moves at each point with equal efforts the same number of times. Burrs are removed with a very fine file. For suburban construction or major repairs at home, you can use compact machines.

Before sharpening round discs that are used for working on aerated concrete, you need to clearly understand what kind of alloy we are talking about. Not every abrasive material will cope well with the task: the harder the metal, the more difficult it is to sharpen it.

The wear of the stone and the cleanliness of the processing depend on the suitability of the abrasive material to the metal, including the grain size. When using machine tools, the speed of rotation also affects the efficiency of sharpening.

The cutting tool can be tipped and carbide tipped. In this case, experts recommend using abrasive wheels with diamond chips or products made of CBN and silicon carbide. Circular saws sharpen from the side of the rear working surface that is in contact with the material.

How to sharpen a saw correctly?

  • Sharpening signs
  • What tools are needed?
  • How to sharpen correctly?
  • saw
  • Wood
  • Framed
  • Helpful hints

Helpful hints

  • The part to be sharpened, as a rule, is always rigidly fixed, the work place must be well lit.
  • The parts to be treated must be the same in height and shape, which can be checked at the end of the work by placing the product on a sheet of white paper. If the result is not achieved, additional reworking using a file is required.
  • The more often the saw is sharpened, the longer it lasts.
  • An important aspect during the work is compliance with safety measures, full concentration of attention and the absence of distractions are required.

Parts are only handled when the machine is off, otherwise the user risks serious injury.

  • Sometimes the fine-tuning of a sharpened tool occurs with fine sandpaper.
  • The teeth should always be brought into the same form, even if only a few are dull. No gaps and precise adherence to technology is the key to success.
  • In the event that the saw is not sharpened independently, this operation should be entrusted to a “narrow specialist”, and not to a “general-purpose grinder”. If sharpening is done independently, it should be noted that the use of a vice will greatly facilitate the solution of the problem.
  • The quality and quantity of sharpening for a product depends on a number of factors. It is necessary to take into account the hardness of the alloy, the future working material and its volume.
sharpen, wood, correctly
  • Naturally, one should also take into account the time elapsed after a similar operation.
  • It is impossible to demand the impossible from circular or chain saws, they are used only as much as declared by the manufacturer, it will be more expensive to deceive yourself.
  • Removal of the metal layer depends on the degree of wear. The more you remove, the less the resource will be.
  • Handicraft work always differs in its effectiveness from the results of the efforts of a specialist using a machine.

Thus, we highlight a number of general rules that should not be forgotten when sharpening saws.

  • Satisfactory fixation is required. It is provided with the help of devices, including those made by hand.
  • Workplace light and distraction-free.
  • Quality tool.
  • Uniformity, smoothness and compliance with the rules of grinding.
  • Deburring with a file or a file with a very fine cut.
  • Checking the lack of gloss on the cutting edge and the correct geometry of the tooth. If it remains rounded, we can assume that nothing has worked out.
  • “Control” cut will show everything. Changes must be substantial.
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For information on how to sharpen the saw correctly, see the next video.

General requirements for sharpening

Not every garage or workshop has a special machine for sharpening hacksaws, but it does not hurt to tweak the tool with your own hands.

There are, of course, exceptions. hardened teeth cannot be sharpened.

Diamond drills and other tricks won’t help.

Such a saw has an increased resource and cannot be repaired, but replaced with a new one.

It is easy to identify hardened steel. it is black with a blue tint.

A grinder or a file and file is usually used as a hacksaw sharpener.

A prerequisite is to first perform the correct setting of the teeth, because the thickness of the hacksaw blade affects the cutting width, so the edges must be bent to the required width.

Required tool

To quickly and efficiently sharpen a hacksaw on wood, you should prepare a set of equipment for setting teeth and sharpening. Would need:

  • Workbench;
  • locksmith vice;
  • pliers;
  • whetstone;
  • sandpaper;
  • measuring tool: protractor and vernier caliper;
  • metalwork hammer;
  • equipment that allows you to fix the blade at angles 90 ° and 45 °.

You will also need files:

How to Saw Correctly. tips and tricks with a Japanese Pull saw

  • cross-section in the form of a triangle;
  • section in the form of a rhombus;
  • flat;
  • needles.

The notch needs to be intact and not clogged with metal dust.
If you sharpen the hacksaw on time and correctly, it will be easy and convenient to work with it. Such a tool will last much longer, delighting its owner with an even and accurate cut and high quality of the surface of the saw cut.

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The question “How to sharpen a hacksaw with your own hands?” does not lose its relevance, despite the presence of a modern power tool in every home.

The saw is needed on the farm, irreplaceable on vacation, used for cutting boards, logs, chipboard.

It is also necessary for construction, carpentry and installation work; in the garden and workshop.

In the city, in the country or in the garage. everyone has this time-tested tool.

How to sharpen a hacksaw on wood

To sharpen a hacksaw on wood, the blade should be fixed in a vice in the same way. Needle files or triangular files with a fine cut are used to sharpen the saw links. Not many people know how to sharpen a file on wood correctly, so you should pay as much attention as possible to this process.

  • Initially, you need to pick up a file. A file with a fine cut should be used, which should be held with one hand by the handle and the other by the tip of the instrument.
  • The sharpening angle is determined, which usually ranges from 15 to 30 degrees. The angle is usually determined by eye, but if it is difficult to do this, then you can use special home-made devices, for example, a wooden block. To do this, the bar is turned until it has the shape of a right-angled triangle with angles of 30 and 60 degrees.
  • The most important thing when working with a file is pressure on it. To ensure even sharpening, you need to make the same number of file passes over each tooth. With experience, you will learn how to remove the top layer of metal evenly.
  • With the help of the prepared device, the sharpening angles are controlled. The process is carried out in the same way on the reverse side of the web.

Now you know how to properly sharpen the teeth of a hacksaw blade for wood. But the process does not end there, as it will be necessary to align the teeth in height. If they have different heights, the uniformity of the cut will be disturbed. If there are links that are higher than the others, then they are shortened using the same file. Checking is carried out using a sheet of paper, to which the blade should be applied with the teeth down. After that, the sizes are compared, and the shortening procedure is repeated.

How to determine when it is time to sharpen a hacksaw

An experienced carpenter can tell if the saw is ready to sharpen by:

  • the sound of sawing a tree changes;
  • teeth change shade.

A number of signs are also available to the less experienced:

  • increased material resistance;
  • it is difficult to maintain the perpendicularity of the cut;
  • the blade does not adhere well to the mowing line of the cut, the line is deflected or bent;
  • the blade gets stuck in the wood.

Before sharpening the saw, it is imperative to separate the teeth, that is, to ensure that they are deflected from the plane of the blade at a certain angle. Correctly set teeth guarantee a kerf wide enough to prevent the blade from getting caught in the material. If the teeth are too set, the kerf will be too wide, this will increase the loss of material, the pulling force, and also reduce the accuracy.
If you sharpen the saw correctly on wood, it regains its working qualities.

During sharpening, the following geometrical characteristics of the teeth are restored:

  • step;
  • height;
  • profile angle;
  • bevel angle of cutting edges.

Important: Blades with hardened teeth must not be sharpened. They are easy to distinguish. they are black with a blue tint. Regular blades can (and should) be sharpened in a timely manner.

Checking the height of the hacksaw teeth

Check the height of the teeth before sharpening the tool.

To do this, lay a sheet of plain paper on a hard and even surface, and press the cutters tightly until a clear print is obtained.

If there are teeth protruding from the general row, traces from them will be reflected in the print.

If there are higher teeth, they are carefully cut with a flat file to the general level.

How to sharpen a saw correctly on wood

Despite the widespread use of circular saws, reciprocating saws and electric jigsaws, the traditional wood saw is preserved in the workshop of every household. With a small amount of work or in hard-to-reach places where you cannot crawl with a power tool, a hand-held hacksaw still helps. In order for the tool to work with sufficient performance, accuracy and quality, it must be sharpened on time.

How to sharpen a hacksaw with a file

The use of a file is still relevant today, so let’s try to figure out how to properly sharpen a hacksaw at home.

Let’s start by installing the canvas.

It must be fixed, as already mentioned above, in a clamp or vice.

The vise cheeks must be made of wood, with a jaw width of at least 200 mm.

The movement of the file should be uniform, and the pressure on the teeth is made only when moving “forward”.

It is necessary to move the hand with the tool to the starting point freely, without effort on the incisors.

In one working pass, an even layer of metal is removed, this will preserve the step, height and profile of the edge.

The sharpness of the cutter can be reduced by the formation of burrs on the surface and irregularities after the passage of the abrasive.

A file cannot perfectly sharpen a hacksaw, but you can get high quality. after sharpening, the smallest file or a file and a touchstone will come in handy.

Burrs are removed by selective cleaning with a fine abrasive, and the edges are smoothed with a wet donor along the side base of the blade.

Having set a goal to sharpen the hacksaw correctly. pay attention to the preservation of the tops of the teeth.

The same cutter height, correct setting affect tool wear resistance and cut quality.

The grandfather’s way of sharpening

The method of sharpening hand saws with your own hands has not undergone much change since the time of our ancestors.

Below you can see a video of how it was done “on the knees” using a needle file and pliers:

Rules for sharpening band saws for wood

Band saw. closed-type cutting tool used on sawmill equipment.

The undoubted advantages of these elements are high productivity and a minimum amount of production waste. It is possible that when sawing ordinary boards, the latter fact does not play a significant role, but when it comes to processing valuable wood, the kerf width and cut quality directly affect the economic benefits.

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Correct sharpening of a band saw for wood is a guarantee of production efficiency and tool durability. Usually such services are provided by specialized companies, but if you know the procedure and the subtleties of the procedure, you can sharpen a dull saw yourself.

  • Characteristics
  • What you need to know about sharpening angles
  • How to sharpen a band saw correctly
  • Wiring
  • Sharpening
  • Common mistakes
  • Characteristics

    There are three distinctive features of band saws. They are made only from special grades of tool steel, which ensures high strength and wear resistance of the teeth. Russian manufacturers usually use steel grades 9ХФ and В2Ф, foreign companies prefer the С75 series. In any case, the hardness of the material must be at least 45 HRS.

    The cutting width of the band saw blade is much narrower than that of circular counterparts. As mentioned above, this is a fundamental factor in the processing of precious woods and industrial wood.

    The saws are able to handle workpieces of any length and diameter without any problems. At the same time, a properly sharpened band saw ensures high production productivity.

    It is necessary to clarify that the reliability of closed saws is explained by the heterogeneity of the material used to make the blade.

    In particular, the body of the saw tool is usually made of spring steel, which has incredible tensile and dynamic resistance. Grades of steel with high m of tungsten and cobalt are used for the manufacture of cutting edges. Separate parts of the web are welded together by high-frequency currents. Tools made using this technology can be used for sawing metal.


    This is the main step in cutting edge dressing and can be done in two ways.

    Full-profile sharpening of saws is carried out with an elbor wheel installed in a special sharpening machine.

    This is a fully automated operation used by professionals. The work of the machine for sharpening band saws for wood is controlled by electronics, and the sharpening wheel processes the entire band in one pass. The disadvantage of this method is that the CBN wheel is selected individually to the profile of the saw, therefore, for dressing different tools, the sharpening element must be present in the assortment.

    Sharpening of teeth is carried out manually or on specialized equipment.

    Note! This is the method used for self-sharpening band saws. A regular emery wheel or file can be used here.

    In the first case, the sharpness of the teeth can be restored in the shortest possible time, but the work requires certain skills. In the second. painstaking work: 4-5 movements along the edge of each tooth.

    For automatic sharpening, diamond, CBN and corundum wheels are used. It is important to understand that when performing this procedure, only sharpness is given to the teeth, the geometry created after setting the blade should remain unchanged.

    What you need to know about sharpening angles

    The geometry of the teeth of band saws can be modified depending on the characteristics of the material being processed. This is expressed in the shape of the tooth and the distance between the individual elements of the cutting edge.

    The band saw profile is determined by the markings applied by the manufacturer. It looks like this:

    • WM. a universal version designed for sawing soft and hard wood;
    • AV. used for longitudinal cutting and sawing of hard materials, such as frozen wood;
    • NV. has a narrow blade width, so it is ideal for shape cutting;
    • NU. a cutting edge with a wide tooth pitch, which provides high performance when cutting soft wood;
    • PV. almost a complete analogue of the previous blade, but has a flattened tooth shape;
    • KV. the profile is used for wide band saws intended for softwood;
    • PU. wide saw blade for cutting hardwood.

    The tooth pitch is selected individually, depending on the material. For example, when cutting hardwood and metal, only fine-toothed blades are used to avoid damaging the cutting edge. Soft raw materials and thick-walled materials are processed with saws with a large tooth spacing, which allows for a faster production process.

    How to sharpen a band saw correctly

    Immediately, we note that if there is no experience and skills in performing such work, it is better to entrust saw sharpening to professionals. Violation of the geometry of the teeth of the cutting edge, the appearance of dross on the metal or incorrect setting will significantly reduce the life of the blade.

    Having decided to sharpen the band saw with your own hands, it will be useful to first familiarize yourself with the key definitions, the knowledge of which may be required in the process. So, for the correct formation of the cutting edge you will need:

    • setting. deviation of the teeth from the plane of the main saw blade;
    • the height of the teeth is the distance between the top point and the base;
    • pitch. the distance between the teeth, usually varies between 19-25 mm.
    • sharpening angle. depends on the intended purpose of the tool; for example, the recommended sharpening angle of carpentry saws is 35 °, indexing. 18-22, intended for sawing a bar. no more than 15 °.

    The sharpening angle is determined by the manufacturer, therefore, when dressing the saw yourself, it is recommended to adhere to these parameters.

    Here are detailed instructions that will help you sharpen a closed saw correctly without resorting to the services of specialists.


    Setting band saws into wood is the first step in restoring the profile of the cutting edge. During operation, the location of the teeth can change, so until the correct geometry is achieved, it makes no sense to sharpen the saw part.

    There are 3 ways to open the saw:

    • classic. the teeth alternately deviate to the right and left sides;
    • stripper. the 1st and 2nd teeth deviate in different directions, the third remains even. This profile is created for sawing hard materials;
    • wavy. the most difficult option, resembling a wave in shape. Here, each tooth is individually shaped, and this type of setting is usually performed only in specialized workshops.

    It should be noted that when wiring, not the entire tooth is bent around, but approximately 2/3 of the upper part. The procedure is performed on a special machine for setting band saws. The cost of such a tool is quite high, so they buy it if you need to adjust several tools. Its presence can become the basis of a sharpening business.

    Of course, the first time you can do everything correctly, even on an adjustable machine, it may not work, so at least the geometry of the profile should remain the same as before the start of work.

    Common mistakes

    If a person tries to sharpen a saw for the first time, it is difficult for him to fulfill all the requirements and remember the nuances of the technological process. However, violation of these rules leads to the fact that the efficiency of using the band saw is significantly reduced, the load on the blade increases, which leads to premature rupture.

    Professionals recommend avoiding such mistakes:

    • with mechanical sharpening, the abrasive stone is not positioned correctly relative to the saw profile. In this case, the sharpening of the teeth will be uneven;
    • excessive force when the saw and the grinding wheel contact. As a result, the metal overheats, dross appears, which leads to premature wear of the cutting edge;
    • burrs remain on the canvas. After sharpening, all roughness must be eliminated, otherwise microscopic cracks will appear on the metal during operation;
    • using your own sharpening angles. Many inexperienced craftsmen believe that only sharpness is important for saw teeth, therefore they shamelessly violate the geometry of the cutting edge profile recommended by the manufacturer. It is important to understand that the shape of the tooth has been tested over the years; it is useless to try to experiment here.

    Instead of a conclusion, we add that each band saw has a certain resource, so the blade cannot be sharpened indefinitely. Manufacturers guarantee correct tool operation until the total blade width is reduced to 65% of the original size.