Setting up a sharpening machine for band saws

Wiring

  • stripping wiring. Every third tooth of the blade is left in the starting position. Others fold back. The method is used to service products that process materials of increased hardness;
  • classic. The teeth are alternately bent to the right and left;
  • wavy. This type of wiring is the most difficult. When applying it, it is planned to bend each individual tooth under a certain degree. over, this degree is individual for each element.

Typically, the product manufacturer indicates the recommended wiring parameters. The range of permissible bend varies from 0.3 to 0.7 millimeters. To carry out the operation, you must have a special adjustable tool.

Tool teeth characteristic

On such tools, depending on the characteristics of the materials to be processed, different forms of teeth can be used. For example, to work with a tree, devices are used with:

  • carpentry;
  • dividing teeth.

The shape and other parameters of these elements are different depending on the type and subspecies of the teeth. The angle at which turning is necessary is determined by the manufacturer. This parameter depends on a large number of factors. However, there is one general tendency: the softer the material, the larger the sharpening angle should be, and vice versa.

A tape designed for cutting metal products is equipped with one of two types of teeth:

  • standard;
  • with “positive rake angle”.

setting, sharpening, machine, band, saws

All these nuances must be taken into account when turning. As statistics show, in eighty. ninety percent of cases, it is the wrong sharpening that causes the tape to break.

Band saws

Band saws are mainly used in woodworking and sawmills. They are a metal strip (closed type) with pointed teeth. The main purpose of the tool is cutting wood.

The advantage of such devices is the small kerf width. This circumstance is very important when it comes to processing valuable wood or expensive metal.

Regardless of the part, cutting with a band saw guarantees:

  • lack of a large amount of waste;
  • high-quality cut;
  • high speed of work.

For the production of such tools, tool steel is used. The use of this material allows you to create saws that will provide a high quality cut. In addition, due to the ultra-strong metal, the allowable tool life is increased.

However, even the best saw will only do the job well if it is sharpened periodically. That is, such a tool must be constantly monitored and serviced in a timely manner. In this case, it will work efficiently. The sharpening machine for band saws will achieve optimal results.

Sharpening

Sharpening can be done with or without a special sharpening machine. This procedure does not require special skills, although people without experience may have certain difficulties. There are two types of sharpening:

  • full-profile sharpening of band saws for wood;
  • sharpening the edges of the teeth.

In the first case, you cannot do without a special machine equipped with an elbor circle. The circle is selected individually based on the shape of the product. The sharpening tool pierces the interdental valleys of the tape, gripping the surfaces of adjacent teeth. The quality of such processing is quite high. However, you will have to purchase a large number of circles with different characteristics.

The edges can be sharpened by hand, without a special machine. However, you can also use the units designed for this. For manual sharpening, an engraver or file is required. The quality of processing on the machine is higher, however, as in the previous case, you will have to acquire a large number of grinding wheels.

Grinding machines

Units designed for full-profile turning operate in automatic mode. The movement of the pusher and the motor with the circle is synchronized. The task of the pusher is to move the tape one step after sharpening each groove. The problem with these machines is the narrowness of their use. For saws of different profiles, you need to have different units.

There are also machines that sharpen the front, back surfaces of the teeth, or both sides at the same time. Grinding wheels. flat wheels, in the manufacture of which a certain abrasive is used:

  • electrocorundum;
  • elbor;
  • diamond spraying.

It is advisable to use special automatic units if it is necessary to service a large number of saws in a short period of time. Otherwise, you can sharpen using a conventional machine or engraver.

Features of band saw turning machines

Band saw is a cutting tool on machines designed for cutting wood, plastic and other materials. Over time, it gradually loses its performance properties. For the subsequent normal use of the saw, in this case, it is necessary to sharpen. A special machine for sharpening band saws allows you to carry out this procedure with a high quality, without asking for outside help.

Useful Tips

The quality of the product depends on the quality of sharpening. During this procedure, certain requirements must be observed. Among them:

  • no burrs should form on the surface of the saws to be sharpened;
  • during sharpening, the same amount of metal must be removed from the entire tooth;
  • it is necessary to use coolant, otherwise the canvas may overheat;
  • the profile, like the height of the elements, should not change during the procedure;
  • the pressure on the teeth must be controlled. Excessive pressure may damage the product.

Thus, the use of band saws makes it possible to increase the productivity of processing wood materials and products made of plastic and metal. Over time, the cutting performance of the tool deteriorates. To correct the situation, it is necessary to sharpen.

You can sharpen the tool using special automatic machines, or hand tools. To avoid damage to the instrument, the instructions must be followed carefully. The efficiency of the saw and the duration of its operation depend on the quality of sharpening.

Industrial equipment

On sale you can find a fairly large number of equipment that can be used to solve the task of bringing the saw geometry to the correct parameters. An example is the Silicon Setting machine imported adjustable band saw machine or Wood Mizer adjustable double-sided saw.

When choosing equipment, you should pay attention to the following points:

  • The country of manufacture. As a rule, equipment of imported origin is more expensive, but its quality is much higher. Among the domestic representatives, one can single out the adjustable double-sided Taiga machine, which has a relatively low price and high quality workmanship.
  • Saw width. Each model Astron or Taiga, from another manufacturer, has a range of possible cutting band widths, which are usually indicated in millimeters.
  • There are several types of the saw itself. When buying, you should pay attention to the fact that the selected equipment must be designed to work with band saws.
  • Adjustable Wood Mizer double-sided machine can work in manual or automatic mode.
  • Considering the Taiga adjustable machine or the RWM adjustable machine, you need to pay attention to the principles of work. The most common and popular is the design that is designed to breed 2 teeth at the same time.
  • In addition, when choosing a manual or automatic adjustable band saw machine, you should pay attention to the power of the installed engine. Not only productivity depends on this, but also the cost of electricity. Also, the manufacturer indicates the mass of the structure, which determines the presentation of installation requirements. The double-sided adjustable band saw machine can weigh about 200 kilograms.

Is it worth making a homemade adjustable band saw machine. a fairly common question.

Note that a homemade version will not have the required accuracy class, which means that the work on sharpening and setting the teeth will not be effective.

Adjustable band saw machine

A band saw is a fairly common cutting equipment that is used to process a variety of materials. Only with proper preparation and maintenance of such equipment can we expect that it will work correctly and for a long time. To do this, you may need an automatic adjustable band saw machine, which you can purchase or create with your own hands.

The procedure for divorcing and sharpening the saw

When choosing a band saw for organizing production activities by processing wood, a lot of attention is paid to what characteristics the saw has: size, cutting edge material, production technology, and so on. However, it is worth remembering that regardless of the type of cutting element, the spreading and sharpening must be carried out periodically.

To begin with, we note that a homemade adjustable band saw machine is extremely rare.

This is due to the points below:

  • The efficiency of the equipment depends on the correctness of sharpening and divorcing. If the work was not done correctly, then the sawing can take place with rapid wear of the teeth.
  • It is important to carry out the work with maximum precision. Modern models can sharpen and lay out with an accuracy of 0.1 millimeter. Such high precision makes cutting easier and smoother.
  • Depending on the workload of the production mowing line, the procedure has to be carried out with great frequency. Therefore, the adjustable band saw machine must work quickly, the whole process is automated as much as possible, which also excludes the possibility of admission of defects when performing work.

Recently, a double-sided adjustable saw for band saws from various manufacturers has been increasingly used.

Customization features

Adjustment of the adjustable band saw machine is carried out depending on the features of its design. If we consider several models of the equipment under consideration, then we can pay attention to the fact that it is structurally significantly different. Some are compact, others have large control units.

Considering how to set up an adjustable band saw machine, we note that it is quite important to take into account the width of the saw and the pitch of the tooth, its height. It is these parameters that are taken into account when setting up the equipment in question.

Sharpening options

There are 2 ways to sharpen saw teeth:

  • Full profile, produced on an automatic band saw sharpening machine. A borazon wheel that matches the tooth profile restores the profile of the interdental cavity in 1 pass and sharpens the cutting edges of the tool.
  • Sharpening of cutting edges of teeth. It can be made manually or on a machine with a flat grinding wheel. At the same time, the edges are sharpened, and microcracks on the working surface of the tool, formed in the process of work, are removed.

The video instruction for sharpening band saws will show the sequence of correct actions when performing this process.

DIY band saw sharpening machine

Grinding machine device

A semi-automatic machine that allows you to sharpen the edges of the saw teeth is a structure consisting of a base on which an abrasive tool with a drive is fixed, a copier that tracks the tooth profile, a pusher, a system of adjusting rods, a liquid cooling system and a panel with unit controls.

The abrasive tool makes a translational movement up and down, by means of the adjusting device the operator can change the angle of inclination of the sharpening tool. The copier provides control of the movement of the abrasive wheel in accordance with the profile of the cutting edge of the tooth, and sets the longitudinal displacement of the saw blade depending on the distance between the teeth.

To sharpen the cutting edge of saws for metal, it is necessary to adjust the equipment by changing the controls for the angle of sharpening of the tooth.

2 Setting and sharpening band saws is the essence of the process

The cutting edge of the tool loses its properties after each use for its intended purpose. It is impossible to correct this situation, the natural wear of the saw during operation is considered inevitable. In this regard, the routing carried out before sharpening the cutting attachment and the sharpening itself have a great influence on the functionality of the tool.

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Set is the procedure for bending the teeth of the cutter to the sides to reduce friction on the blade and prevent it from pinching. This operation is performed in three ways:

  • stripping: every third saw tooth is left in the initial position, this method of setting is recommended in cases where the band saw machine processes very hard alloys and materials;
  • classic: alternate bending of the teeth to the left and to the right is made;
  • wavy: the most difficult type of procedure, in which the bend rate of each hotel tooth is purely individual.

The wiring is carried out by means of adjustable special devices. Its value, as a rule, does not exceed 0.7 mm (in practice, teeth are divorced by a smaller amount. from 0.3 to 0.6 mm). Note that 2/3 or 1/3 of the tooth is folded back, not the entire tooth.

After a well-done wiring, you can send the tool to the band saw sharpening machine and start sharpening it. It is known that more than 80 percent of cases when a saw loses its operating parameters is associated with improper sharpening or the fact that it was not produced in a timely manner. It is easy to determine the need to perform the procedure visually. by the increased roughness of the saw cut walls, or by the type of teeth.

The hardness of the teeth directly affects which specific wheels should be installed on the band saw sharpening machine. For bimetallic tools, borazon or diamond wheels are usually chosen, for those made of tool steels, corundum wheels. But the shape of products for sharpening is determined by the characteristics of the saw. From this point of view, circles can be:

When sharpening teeth, you must adhere to the following mandatory requirements:

  • no burrs should appear;
  • metal removal along the tooth profile must be uniform;
  • use liquid to cool the unit for sharpening;
  • the profile of the tooth and its height should not change as a result of the procedure;
  • excessive pressure on the wheel is unacceptable, since in this situation there is a high risk of annealing formation.

Before sharpening, it is advisable to leave the tool in an inverted suspended state for 10–12 hours. This will greatly facilitate the process.

In most cases, home sharpening is performed on the back surface of the saw teeth, although the manufacturer’s recommendations allow the operation to be performed on the front surface.

Automatic Band Saw Blade Grinder |Karan Industries

The device of the sharpening machine for band saws, the setting of teeth and instructions for restoring the blade

The use of a sharpening machine for band saws allows you to quickly and efficiently restore the working surface of the tool and provide the manufacturer’s declared volume of wood cutting before the blade breaks.

Band saw sharpening machine. easy and efficient sharpening operations

If you have a sharpening machine for band saws, it is not difficult to sharpen such a tool on your own without going to specialized workshops, where simple services require a lot of money.

Bandsaw sharpening mechanisms and machines

The use of band saws for sawing wood and other materials ensures minimal losses during processing and increases labor productivity. Circular saws have lower productivity and lower material efficiency.

The average performance of the cutting tool declared by various manufacturers of band saws, before breaking, must correspond to the volume of sawing more than 60 m³ of round timber.

With bluntness or improper sharpening of the working part of the saw tooth, the productivity of the process drops sharply. After the cut, a large wave appears on the surface of the treated wood, the saw breaks. Which negates all the advantages of such saws.

In order to properly sharpen the band saw, it is necessary first of all to restore the setting of the teeth of the working blade. For this operation, an adjustable machine is used, which allows you to accurately set each tooth to the required angle. It allows you to bend a third or 2/3 of the tooth height, restoring the original profile of the instrument.

To ensure high strength and wear-resistant properties, the saw blade consists of 2 parts, welded together. The main blade is made of springy steel that can withstand strong dynamic loads. The cutting surface of the tool is made of tool steel, increased strength and wear resistance, with a large m of tungsten and cobalt.

Since the hardness of the material of the cutting edge of the saw is higher than 45 HRS, corundum, diamond and CBN wheels are used to sharpen it. When sharpening, a borazon (CBN) wheel is preferable to a diamond one, although its hardness is 10-20% lower than that of a diamond one, but its chemical and thermal resistance is 2 times higher.

Borazon is a trade mark of technical cubic boron nitride registered by the American company General Electric, and elbor is a material synthesized in the USSR with the same chemical formula, but manufactured using a different technology. Experts believe that grinding wheels made of Russian Elbor are of better quality and more wear-resistant.

Structural differences of band saw sharpening machines:

  • devices with a manual drive, which, by means of the action of a rotating abrasive wheel on a tooth, restore the sharpness of its edge;
  • installations with a mechanical automation system for the sharpening process, which allows you to adjust the required process parameters;
  • automated centers controlled by computer systems.

A revolution in the technology of sharpening band saws was made by Wood-Mizer, which proposed a method in which a profile borazon wheel restores both the tooth profile and its sharpness in 1 pass. The disadvantage of this method is that you must have a different circle for each saw tooth profile.

There are sharpening devices for band saws on the market in 3 price segments:

  • RUB 15,000-30,000. fairly cheap machines. This includes flat disc grinders that sharpen the cutting edge of a tooth. A simplified version of the device with a disc for profile sharpening of a tooth.
  • RUB 85,000-130,000. expensive copies of Wood-Mizer devices and machines of the original company.
  • RUB 60,000-65,000. Russian machine developed by Westron.

The first category of equipment does not provide a full-profile groove of the interdental groove when sharpening with a flat wheel, thereby reducing the saw’s resource to sawing 15-20 m³ of round timber. Simplified versions of machines for sharpening saws on wood with a full-profile circle suffer from the presence of large backlashes, which lead to the beating of the wheel and, as a result, to incorrect sharpening and quick failure of the CBN wheel.

In the second category, it is better to buy original woodmaker machines.

The third group includes Russian machines manufactured by Westron with an optimal cost and performance that exceeds foreign counterparts:

  • diversified CBN discs have a wear resistance 30-40% higher than their foreign counterparts;
  • ergonomic, well-thought-out adjustment of the saw sharpening device, which allows the correct sharpening of the tool tooth profile.

The device and operation of the sharpening machine

As a typical representative of the park of semiautomatic saw sharpening machines, the PSZL machine can be cited.

The setting of the operating parameters is carried out with the adjusting screws:

  • The screw 1 adjusts the position under the abrasive tool and determines the depth of penetration along the leading edge;
  • Point 2 adjusts the depth of the disc lowering, the position lock 3 is used to set the maximum limit for the depth;
  • Rotary knob 4 determines the tooth pitch with which the cam will push the belt along the pressure bars.

So that the machine can determine the point from which the sharpening of the teeth began, a magnet is installed on the blade from the inside.

During the processing of the steel sheet, the material is cooled by oil. The fluid drains off the surface of the saw band, is collected and is pumped by an oil pump through a filter and magnet. The first one retains non-magnetic inclusions and abrasive dust, the second one. metal shavings.

Automatic machine PZSL 30/60 is capable of processing any tooth profile for the most common belt sizes, lengths from 30 to 60 mm to 10 m. CBN and diamond wheels are used as working discs. To master work on a sharpening machine, even an inexperienced person will need practice for 1-2 hours, as in

Band saw sharpening machine

Cutting and sawing of solid wood and ordinary sawn timber is carried out by two types of machines. circular circular saw and endless band saws. Cutting technology with a thin band saw, welded into a ring, produces less waste, a higher quality of the processed surface, and is recognized as the most advanced technology in wood processing. The high cutting speed and the pressure on the cutting edge of the band require you to periodically re-sharpen the blade using a band saw sharpener. Today, in addition to dense wood massifs, individual grades of steels and alloys are also cut with tape.

How band saws are sharpened

To achieve high productivity, the saw blade is made of chrome vanadium steels, which have high abrasion resistance and surface hardness. Expensive models of band saws are made in the form of two welded bands, different widths and different metals.

For the wide part, spring steel grades are used, which have a high resistance to alternating loads. For a thin strip of fabric, alloys containing cobalt and tungsten are used. Sharpening of band saws for wood of this design requires the use of special materials. For a conventional saw made of 9HF steel, grinding wheels based on boron or titanium nitrides are used. Cobalt or tungsten alloys have to be cut with diamond materials.

To properly prepare the cutting edge of the band saw for use on sharpening equipment, you will need:

  • Carry out the spreading of the band, sequentially bending half or 2/3 of the height of each tooth in different directions from the mowing line of the cut. The optimal bend size is 0.5-0.7 mm. The operation is performed using a special device until the saw is installed on the sharpening machine;
  • Correctly set the height and edge of the profile to be sharpened on the sharpening machine. Instructions for sharpening band saws require machining the front face of the tooth profile, but the saw can also be resharpened along the rear face. Band saws for metal have the smallest height and profile pitch;
  • Precisely adjust the movement of the grinding wheel of the machine along the profile of the tooth cavity. In this case, full-profile sharpening is achieved. If the blade thickness is small, the band saw sharpener is adjusted to machine the top cutting edges of the profile to avoid thinning the base of the tooth.

The parameters of the profile and the angle of inclination are set during the production of the band saw, and during the entire period of operation they do not change. If the tilt of the grinding stone of the machine is incorrectly adjusted, the optimum angle can be artificially increased. As a result, the saw installed on the sawing machine will work with overload and quickly fail.

The condition of the band saw and the need for sharpening are often determined by the cutting force and visually by the cutting edge of the profile. For cutting blades of low-power machines, you can not even use a band saw sharpening machine, you can correct the edge with a file. The small amount of metal removed practically does not affect the geometry, but it can significantly increase the cutting ability of the blade.

The most successful machine tool grinding systems

Among the most famous automatic machines, we can mention the products of the Wood-Mizer company, specializing in the manufacture of sawmills and sawing lines. For example, the BMS500 machine, equipped with a 500 W electric drive, is capable of sharpening a band saw blade of any complexity in a fully automatic mode in 4-5 minutes of work.

In addition to full automatic machines, the company produces a whole line of semi-automatic and manual machine tools that allow you to sharpen band saw teeth with maximum accuracy and thereby provide an increase in resource by 30-50%.

One of the best manufacturers of saw sharpening machine tools is Vollmer, which specializes in the production of precise programmable mechanics.

The third line in the ranking of manufacturers of sharpening systems can be given to the company Lenker, which specializes in the production of cutting tools for machine tools.

Band saw sharpeners and machines

A short blade with small teeth can be sharpened with a needle file or an attachment to an engraving machine. It is difficult and time-consuming, but quite possible. The main problem with manual sharpening is that each tooth has a subtle deviation from the optimal parameters. The belt installed on the sawing machine experiences off-design loads and gets very hot.

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An electric sharpening machine allows you to make the edges of all teeth of a band saw more or less the same. It is only necessary to correctly adjust the web feed system and the amount of entry of the CBN grinding wheel into the profile.

Structurally, machines for sharpening and restoring the edges of band saws are divided into several categories:

  • Semi-automatic with manual drive blades and consoles of abrasive tools;
  • Machine tools with adjustable step of movement and saw feed with automatic profile sharpening according to adjustable blade parameters. In addition to the geometry of the tooth, the machine’s sensor monitors the number of teeth sharpened in the band and stops automatically after completing a full cycle;
  • Machining centers with programmable setting of the required feed and sharpening parameters. Such designs are used for sharpening complex and massive belts using coolants and controlling the operating temperature and quality of processing.

The first models of sharpening machines were almost entirely manual. Unlike modern models, blade feeding, angle adjustment and sharpening had to be done with the integrated belt and abrasive wheel drives. To work on such a machine required very serious experience, and the training of a band saw sharpening specialist took a rather long period of time.

With the advent of automated machine tools, the human factor began to decrease. Now it was enough to correctly adjust the feed cam movement and the angle of the tooth sharpening. All other operations were performed by duplicating settings.

Sharpening centers made it possible to significantly increase the quality and productivity of work. The most sophisticated multi-profile saws have been sharpened with utmost precision.

The average payback period for the simplest models at 50% load is 4-5 months of operation. With a resource of the main mechanical parts of 24-36 months, the machine is able to reduce the cost of purchasing expensive band saws for a carpentry workshop by about 45-50%. The given data does not include the cost of CBN materials.

FOR BAND SAWS

Sharpening machine for band saws “Altai-z22

SHARPENING MACHINE

Manual

Automatic Saw Blade Sharpening Machine. Amazing Bandsaw Blade Sharpener Machines Working Technology

Hello dear colleague!

Thank you for choosing our

grinding machine “Altai-z22”.

Currently, our machines work effectively for many people throughout Russia. our friends. with whom we have developed relationships from good to best.

We will do our best and hope that we will have the same relationship with you.

The Altaylestekhmash company aims to produce woodworking equipment that is not inferior in its characteristics to world leaders.

Tel /, 8-800-700-08-40 (free call)

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3.1 Fitting the grinding wheel

3.2 Grinding wheel arbor

4.1 General

4.2 Adjusting the sharpening angle

4.3 Adjusting the tooth height

4.4 Setting the sharpening of the cutting edge

Preparing the sharpening machine for work

5.1 Installing and removing the saw band from the machine

5.2 Procedure for starting and stopping the sharpener

General information on sharpening band saws

When the band saws come into contact with the wood during the sawing process, the teeth are ground down. The wear of the teeth is more intense when sawing dirty wood, that is, when dirt, stones, sand or other foreign particles get into the cutting zone. for this reason, the timber must be cleaned before sawing.

External signs of the need to sharpen the blade are that the tips of the teeth become round and shiny, the blade stops “cutting” into the material with the same efficiency. Sawdust is poorly removed from the cut, and the cut at the exit turns out to be wavy.

Operation of a band saw with a blunt blade entails:

The average amount of timber production between two sharpenings of the blade is 0, 7. 1, 17 cubic meters. m. The maximum output, subject to all the rules for the care of the blade, can reach 3.5 cubic meters. m.

Before removing the band saw from the band saw for sharpening from the saw blade, you need to remove the adhering pieces of wood (sawdust), for this the blade is poured with water for 15 seconds, after which it is thoroughly wiped off with a dry clean cloth.

After that, the removed saw should be turned inside out and hung for 8-10 hours to relieve internal stresses, after which the saw is ready for sharpening. To obtain pointed tips of the teeth, it is necessary to grind their leading and trailing edges. The duration of this sanding depends on how rounded the edges are. With a significant dullness of the blade, it is better to grind in two. three passes. The average sharpening time ranges from 5 to 15 minutes and depends on the condition of the sharpened blade and its feed speed. If the tip of the tooth becomes bluish when sharpening or the wear of the grinding wheel is too great, this means that the sharpening speed is too high. When the maximum allowable load when sharpening is reached, the protection relay in the power supply unit is activated and the machine stops. In this case, it is necessary to reduce the insertion of the grinding wheel with the screw 16 (Fig. 1).

The device of the machine “Altai-z22”

The machine for sharpening band saws “Altai-Z22” (hereinafter “machine”) (Fig. 1) consists of a bed 1 on legs 2. The machine drive is mounted on the bed, consisting of a gear motor 5, which drives a cam 6 with a pusher 7 for the implementation of the advancement of the saw blade in the process of sharpening.

The sharpening unit is mounted to the plate 9 with a bolt 10, has the ability to turn on the screws 11 and consists of an electric motor 12, closed by a casing 13. The electric motor drives a spindle unit with a rubber ring 31, on which a grinding wheel is fixed 14. On the axis of rotation of the screws 11, using a permanent connection, a plate 15 is planted, which, through a system of levers 16, 17 and a support roller 19, moves the grinding wheel during sharpening according to the “program” (contour) specified by the cam profile.

The saw blade before sharpening is placed between the guide 20, the clamp 21 of the machine, in the stops 22 of the three brackets 23 (Fig. 3) and is clamped with spring-loaded eccentric levers 24.

The power supply system of the machine consists of a power supply unit, which is connected to a 220 V network. The power supply unit is equipped with an ammeter to control the load current by a voltage regulator, which allows it to be regulated within 14 V.

ATTENTION! In the absence of a power supply unit, it is possible to ensure the operation of the machine from the vehicle’s on-board network of a battery power source with a voltage of 12 V. This significantly expands the autonomy and the possibility of using the machine even in the field.

Machine control unit 30 has 3 toggle switches.

The “FEED” toggle switch has 3 positions: 0. off, 1.minimum feed rate and 2.optimal feedrate.

Toggle switch “CIRCLE” for turning on the sharpening unit.

Toggle switch “LIGHT” to turn on the lamp in order to improve visual control in the sharpening area.

The power supply and control unit is equipped with indicators for visual control of the processes of turning on the machine units into operation.

Installation and arbor of the grinding wheel

3.1 Fitting the grinding wheel

For sharpening band saws, a grinding wheel with a diameter of 125-150 mm and a width of 6.0 mm with a bore diameter of 32 mm is used.

ATTENTION! Before use, the grinding wheel should be checked for chips, do not use wheels if damaged. To prevent damage during transport, remove the grinding wheel from the machine.

Before installing a new grinding wheel, set the sharpening head assembly to its uppermost position.

To install the grinding wheel, unscrew the special nut 3 (Fig. 3) of the spindle unit and successively remove the washer 4, the spacer 5 and the grinding wheel 6 from the spindle of the sharpening unit, fixed on the motor axis with a screw 7. Assemble the sharpening unit in the reverse order.

ATTENTION! Remember to install the protective cover of the casing before starting work. After installing the grinding wheel with the adjusting screw, set the gap between the lower edge of the grinding wheel and the upper part of the guide 20 and clamp 21 (see Fig. 1, Fig. 3).

3.2 Grinding wheel arbor

The grinding wheel must have a predetermined profile, to maintain which its mandrel is made. The wheel is sharpened also when a lot of metal has adhered to the wheel or the correct sharpening of the teeth is not provided. The mandrel process can be divided into 3 stages (see fig. 3):

A) mandrel of the circle

B) a mandrel of a small radius on the left side of the circle

B) an angle mandrel on the right side of the circle for the profile of the posterior surface of the tooth.

The grinding wheel is set after its installation in its original place in accordance with section 3.1 and only after the machine has been adjusted to sharpen the blade.

ATTENTION! During the mandrel of the grinding wheel, the machine drive (geared motor) must be disconnected, and push. fig. 1) must be in the lower position in order to prevent spontaneous accidental movement.

The mandrel is made with an abrasive stone in the following order:

First, a mandrel of the edge (cylindrical outer surface) of the grinding wheel is made, as a result of which a chamfer is formed parallel to the clamping surface of the machine, i.e., guide 20 and clamp 21 (see Fig. 1, Fig. 3).

ATTENTION! After each adjustment of the sharpening unit according to the newly selected angle of sharpening of the blade teeth, it is necessary to re-make the mandrel of the grinding wheel edge.

After the mandrel of the edge of the grinding wheel, the mandrel of its left side is made along a small radius of conjugation of the working left surface of the disc with a chamfer (Fig. 4). It is very important to maintain a small rounding radius. This area of ​​the grinding disk accounts for the largest amount of grinding work, i.e., there is a rapid wear, at which the mating radius increases, and this, in turn, leads to a significant decrease in the angle of sharpening of the tooth.

ATTENTION! Constantly check the radius of the rounding on the left edge and, as it increases, make the arbor of the grinding wheel.

The last step in the preparation of the grinding wheel is the mandrel of its right side, i.e. chamfering on the right edge of the disc at the same angle as the angle of the rear surface of the blade teeth. In this case, the chamfer should be oriented to 1/3 of the disc width (see view A in Fig. 5).

In the case of severe processing of the back surface of the tooth, make a mandrel on the right side of the grinding wheel at a large angle (view B Fig. 5).

ATTENTION! Wear safety goggles when working on the grinding wheel mandrel.

ATTENTION! Never try to straighten the grinding wheel on its left side.

ATTENTION! Intensive wear of the grinding wheel can be caused by:

With a decrease in the outer diameter of the grinding wheel, the area of ​​its working surface decreases and the intensity of its wear increases. Regularly check the grinding wheel dimensions, profile, surface quality and, if necessary, carry out a mandrel or replacement.

Setting up a sharpening machine

4.1 General

Before you start adjusting the working parts of the band saw sharpener, it must be completely assembled. The grinding wheel must be installed and have the required profile, that is, its edges must be mandreled according to section 3. The blade must be installed on the brackets and secured with clamps (see section 5.1).

The machine units that form the blade parameters during the sharpening process are subject to adjustment:

In addition, during the sharpening process, the sharpening speed and the amount of coolant pressure are regulated.

4.2 Adjusting the sharpening angle

The required sharpening angle of the teeth is taken from the table in section 1 of the “Methodological manual for working with the blade of the band saw complex” in accordance with the type of wood to be cut. To install the grinding wheel at the selected angle of sharpening of teeth 10, 12.5 or 15 degrees, a graduation scale is glued to plate 9.

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To adjust the sharpening angle, loosen the mounting bolt of the sharpening unit 10 (Fig. 1), located on the rear side of the machine above the housing for fastening the brackets, by lightly tapping on the housing of the unit, change its position to obtain the required angle. The required angle is set using the pointer and screw 4, which are installed on the axis of rotation of the sharpening unit.

4.3 Adjusting the tooth height

The term “Tooth height” defines by what amount the groove between the teeth should be sharpened, that is, how much material must be removed from the groove between the teeth of the blade. To adjust this parameter, use the sharpening depth adjustment screw 16 (Fig. 1). By tightening the screw, you raise the grinding wheel, which leads to a decrease in the height of the tooth when sharpening. Removing the screw. you lower the circle, that is, the height of the tooth increases.

When adjusting the grinding of the tooth in height, it is necessary to first turn the cam 6 so that the fork (fig. 1) is in the extreme left position, after which, rotating the grinding wheel by hand, you need to check the quality of the contact between the wheel and the recess.

ATTENTION! To prevent grinding of the groove between the teeth beyond the required rate, use a stop screw located in the sleeve with a collar on the grinding wheel guard (see Fig. 1).

When adjusting the height of the tooth, make sure that the stop screw is screwed in just enough so that it does not limit the adjustment ranges.

ATTENTION! If you have already processed the interdental cavity once, then this will need to be done every time you sharpen the blade.

4.4 Setting the sharpening of the cutting edge

When the drive of the sharpening machine is turned on, the cam 6 starts to rotate (Fig. 1), which drives the pusher 7 for feeding the blade blade, which brings the next tooth under the grinding wheel, i.e., the grinding point of the cutting edge of the tooth. Adjustment of the pusher length, on which the location of the tooth under the grinding wheel depends, is carried out using the adjusting nut 8 (Fig. 1). The quality of the cutting edge depends on this adjustment.

ATTENTION! Before adjusting the sharpening of the cutting edge, raise the sharpening unit with the depth control screw so that the grinding wheel does not touch the blade in the lower position.

Using the adjusting nut, position the tooth to be moved by the pusher under the grinding wheel so that it lightly touches the cutting edge of the tooth. By turning the cam clockwise, the tooth is brought closer to the grinding wheel. Turning the cam counterclockwise moves the tooth away from the circle.

Check the quality of the adjustment by lowering the sharpening unit and turning the grinding wheel by hand. Then turn on the drive of the machine 5 (Fig. 1) by setting the “feed” toggle switch to position 1, that is, the minimum feed. After making sure that all the adjustments are correct, proceed with the processing of the blade, while it is necessary to increase the feed rate by switching the toggle switch to position 2.

The procedure for performing work on sharpening band saws

ATTENTION! Remember to wear safety glasses when working with the sharpener.

5.1 Preparing the sharpener for work

Insert the rods 23 (see Fig. 2) into the slots of the housing 18 and fix them with the screws. Set a limit at a distance of 6-10 cm from the end of the rods.

5.2 Fitting and removing the band saw blade from the sharpener

Turn the cam so that the pusher fork 7 (Fig. 1), lying on the guide 20, is in the extreme right position.

Unfold the blade and position it in the stops over the three sharpener holders. Make sure that the blade teeth are positioned so that the pusher, moving to the left, will abut against the working edge of the tooth and move the blade. Unscrew the blade if necessary.

While holding the blade with your left hand, release the jig. Lift the sharpening unit (grinding wheel) with your left thumb, and with your right fingers, lift the pusher. Insert the blade between the guide 20 and the clamp 21 (fig. 3). Lower the pusher and then the sharpening unit. Clamp the blade with the eccentric levers 24.

Removing the blade from the machine is done in the reverse order.

5.3 Procedure for starting and stopping the sharpening machine

Finally adjust the position of the limiters 22 (Fig. 1) on the brackets and fix them.

Connect the power supply to the 220 V power supply and adjust the machine supply voltage (12 V).

Turn on the rotation of the grinding wheel with the “CIRCLE” toggle switch and make sure that the sharpening unit is set correctly.

Turn on the machine drive by setting the “FEED” toggle switch to position 1 and make sure that the feed unit is set correctly.

After making sure that the machine is working properly, you can increase the feed rate by setting the “FEED” toggle switch to position 2.

Stop the sharpening machine in the reverse order.

In the attached set of jaws, the KAMACHOK is used for sharpening WOMACO saws, a cam for sharpening LENOX saws.

The device of the sharpening machine for band saws, the setting of teeth and instructions for restoring the blade

The use of a sharpening machine for band saws allows you to quickly and efficiently restore the working surface of the tool and provide the manufacturer’s declared volume of wood cutting before the blade breaks.

How to sharpen a saw correctly on a machine?

At home, in order to properly sharpen the saw teeth with your own hands, you must:

  • restore the setting of the teeth, bending 2/3 of the tooth length away from the generatrix of the blade, restoring the initial setting angle;
  • sharpen the edges of the teeth with an abrasive tool, removing microcracks from the surface of the material.

The basic rules that must be followed when restoring the saw blade on the machine:

  • to make the setting of the teeth on special equipment, restoring the initial setting angle;
  • set up the machine to remove enough material from the cutting edge to remove all damage and microcracks;
  • sharpening with the cooling system turned on, avoiding blue discoloration of the tooth material;
  • start the sharpening process from the place where the blade is welded into the ring.

Grinding machine device

A semi-automatic machine that allows you to sharpen the edges of the saw teeth is a structure consisting of a base on which an abrasive tool with a drive is fixed, a copier that tracks the tooth profile, a pusher, a system of adjusting rods, a liquid cooling system and a panel with unit controls.

The abrasive tool makes a translational movement up and down, by means of the adjusting device the operator can change the angle of inclination of the sharpening tool. The copier provides control of the movement of the abrasive wheel in accordance with the profile of the cutting edge of the tooth, and sets the longitudinal displacement of the saw blade depending on the distance between the teeth.

To sharpen the cutting edge of saws for metal, it is necessary to adjust the equipment by changing the controls for the angle of sharpening of the tooth.

Popular models

In the Russian market, in the rating of popular models of saw sharpening machines, in prestigious positions are budget machines from the Voronezh company “HIT”, which produces a line of equipment under the AZU-02 brand. The company also produces machines for setting teeth RU-04 / 08M.05.07. In the more expensive price segment, the leader is the PZSL30 60 PROFI model, developed by the Westron company near Moscow.

Bandsaw sharpening mechanisms and machines

The use of band saws for sawing wood and other materials ensures minimal losses during processing and increases labor productivity. Circular saws have lower productivity and lower material efficiency.

The average performance of the cutting tool declared by various manufacturers of band saws, before breaking, must correspond to the volume of sawing more than 60 m³ of round timber.

With bluntness or improper sharpening of the working part of the saw tooth, the productivity of the process drops sharply. After the cut, a large wave appears on the surface of the treated wood, the saw breaks. Which negates all the advantages of such saws.

In order to properly sharpen the band saw, it is necessary first of all to restore the setting of the teeth of the working blade. For this operation, an adjustable machine is used, which allows you to accurately set each tooth to the required angle. It allows you to bend a third or 2/3 of the tooth height, restoring the original profile of the instrument.

To ensure high strength and wear-resistant properties, the saw blade consists of 2 parts, welded together. The main blade is made of springy steel that can withstand strong dynamic loads. The cutting surface of the tool is made of tool steel, increased strength and wear resistance, with a large m of tungsten and cobalt.

Since the hardness of the material of the cutting edge of the saw is higher than 45 HRS, corundum, diamond and CBN wheels are used to sharpen it. When sharpening, a borazon (CBN) wheel is preferable to a diamond one, although its hardness is 10-20% lower than that of a diamond one, but its chemical and thermal resistance is 2 times higher.

Borazon is a trade mark of technical cubic boron nitride registered by the American company General Electric, and elbor is a material synthesized in the USSR with the same chemical formula, but manufactured using a different technology. Experts believe that grinding wheels made of Russian Elbor are of better quality and more wear-resistant.

Structural differences of band saw sharpening machines:

  • devices with a manual drive, which, by means of the action of a rotating abrasive wheel on a tooth, restore the sharpness of its edge;
  • installations with a mechanical automation system for the sharpening process, which allows you to adjust the required process parameters;
  • automated centers controlled by computer systems.

A revolution in the technology of sharpening band saws was made by Wood-Mizer, which proposed a method in which a profile borazon wheel restores both the tooth profile and its sharpness in 1 pass. The disadvantage of this method is that you must have a different circle for each saw tooth profile.

There are sharpening devices for band saws on the market in 3 price segments:

  • RUB 15,000-30,000. fairly cheap machines. This includes flat disc grinders that sharpen the cutting edge of a tooth. A simplified version of the device with a disc for profile sharpening of a tooth.
  • RUB 85,000-130,000. expensive copies of Wood-Mizer devices and machines of the original company.
  • RUB 60,000-65,000. Russian machine developed by Westron.

The first category of equipment does not provide a full-profile groove of the interdental groove when sharpening with a flat wheel, thereby reducing the saw’s resource to sawing 15-20 m³ of round timber. Simplified versions of machines for sharpening saws on wood with a full-profile circle suffer from the presence of large backlashes, which lead to the beating of the wheel and, as a result, to incorrect sharpening and quick failure of the CBN wheel.

In the second category, it is better to buy original woodmaker machines.

The third group includes Russian machines manufactured by Westron with an optimal cost and performance that exceeds foreign counterparts:

  • diversified CBN discs have a wear resistance 30-40% higher than their foreign counterparts;
  • ergonomic, well-thought-out adjustment of the saw sharpening device, which allows the correct sharpening of the tool tooth profile.

Sharpening options

There are 2 ways to sharpen saw teeth:

  • Full profile, produced on an automatic band saw sharpening machine. A borazon wheel that matches the tooth profile restores the profile of the interdental cavity in 1 pass and sharpens the cutting edges of the tool.
  • Sharpening of cutting edges of teeth. It can be made manually or on a machine with a flat grinding wheel. At the same time, the edges are sharpened, and microcracks on the working surface of the tool, formed in the process of work, are removed.

The video instruction for sharpening band saws will show the sequence of correct actions when performing this process.