Sharpening carbide-tipped circular saws

Circular saws are a tool that is used regularly in the woodworking and construction industries. A circular saw works with a variety of materials and the quality of the cut is of great importance. Sooner or later, the question of restoring the saw teeth arises. The ability to carry out this work at a high professional level will make it possible to use the cutting tool for a long time.

Circular saws are needed both in private households and in production. When building a house, creating furniture, cutting boards, beams - a similar tool is required everywhere. Sharpening a circular saw correctly requires practical skills and knowledge.

Circular saws compare favorably with other cutting tools:

• chain;
• saber;
• longitudinal.

Disc circular devices have significant performance, and their service life is also much longer. Sharpening circular saws is an important necessary step; without it, the tool will not work fully. Thanks to the various carbide-tipped nozzles, as well as victorious coatings, cutting can be carried out both with wood and with metals.

To sharpen discs with different attachments, special equipment is required. If the processing of the disk is done "according to science", it will greatly extend its service life.

Timely sharpening of circular saws is performed with several obvious signs.

• The engine begins to experience unnecessary stress. The reason is simple - the teeth are dull, and additional resources are required to process the material. There is a danger: if the disc is damaged, if the engine shutdown relay is missing, the machine may fail.
• If chipping and chips form on the cut, and the cut itself becomes too wide, then this is a sure sign - the tool should be repaired.
• An extraneous smell of burnt material appears, and dark spots are also visible on the cut line.
• The time it takes to process the part increases.

If the disc is correctly sharpened and the teeth are set according to the template, then it can process the workpiece in any direction relative to the wood fibers.

There are such types of tools:

• saw with carbide discs;
• discs made of solid metal;
• discs with hard-toothed teeth;
• discs with heavy-duty brazed teeth.

Hard woods are processed with discs that have special grooves. Technological breaks prevent deformation of the tool, do not allow it to overheat during the production cycle. And also vibration, noise background is significantly reduced, the quality of the line formed by the cut is improved. The saw has teeth that are cut at a certain angle, each tooth has several cutting edges.

There is a main edge, additional ones mate with it, and intersecting planes are formed:

• A;
• V;
• WITH.

The planes themselves also vary in different mates.

Teeth can be straight, they are usually used for preliminary cutting of material... These teeth provide a low cut. However, the performance of such teeth is quite high.

Beveled teeth provide a more accurate line and are suitable for materials such as:

• plywood;
• PVC sheets;
• Chipboard;
• Fiberboard.

The teeth provide a smooth cut without crumbling the material.

There are also discs that have a bevel at the leading edge of the cutter also have a bevel with a trailing edge... Variants of alternating different teeth with different bevels are possible. Such tricks ensure a clean cut, but remember: the denser the material, the faster such teeth become blunt.

Trapezoidal tooth - this configuration of teeth ensures a long service life of the tool. A complex design is often used when trapezoidal and straight teeth alternate. The second ones carry out the primary cut, which makes it possible for the straight teeth to "polish" the cut produced.

Cone shaped tooth - such teeth are auxiliary and are designed to work with materials on which a laminated surface is present. They ensure a correct cut without any chipping.

Sickle tooth - in this case, the teeth are bent, which makes it possible to accurately cut the material across the wood fibers.

Circular saws, sooner or later, lose their performance characteristics during operation, it is possible to effectively extend the service life of the tool if it is properly sharpened again. This operation is simple, in many cases you can do the work yourself.

First of all, you should have an idea: what parameters the working disk of the unit has. The second most important parameter is the sharpening angle, what parameters the tooth itself has.

Before starting to work, you should test the tool, understand how relevant its recovery is. The disc should be inspected by removing it from the machine. An important indicator is the change in size, this can be seen even with a cursory examination.

The knobs themselves are made of ultra-strong steel of the brand:

• 9HF;
• 50 HVA;
• 65G.

And also some other grades of steel are used.

This material stands out for its strength and durability, but it also requires preventive treatment.

The teeth themselves have a standard prescribed in GOST 9768-78, however, each manufacturer has a differentiation in the angles of inclination and shape.

In the absence of a template, it will be necessary to determine the parameters of the teeth yourself. For this there is a tool - a pendulum goniometer. With this tool, you can precisely align the sharpening angle.

Another option is take a new disk and use it as a template... You should take a sheet of thick cardboard, draw precise outlines on it with a pencil. Then, using a pendulum angle meter, the exact configuration of the soldering should be established. This it is recommended to save the sample, it will be possible to work with it in the futureusing as a reference.

After the end of the work, it will be necessary to test the obtained sample by comparing it with the standard. The angle of inclination in such saws ranges from 15 to 25 degrees..

Consider when starting work: the rake angle can be negative.Such models are used for working with PVC sheets, as well as with soft metals.

You can sharpen the tool with your own hands (if it does not have a winning coating) at home on your own. And also in such cases, you can use a simple machine on which you can successfully sharpen any edges. It is very important to choose the correct circle.

They are of the following types:

• corundum;
• diamond.

Grinding equipment for soldered discs is not cheap and can only be found in specialized technical centers.

Recovers to move the sharpening independently:

• it costs extra work;
• manual movement accuracy will be poor;
• if there is no skill in sharpening circles, then it is recommended to contact the professionals.

There are rules:

• the main defect occurs at the edge from above, that is, the edges are rounded within 0.11-0.31 mm - this is the starting point from which sharpening should be started;
• both the front and rear parts should be processed, this should be done at least 26 times;
• the size does not exceed 0.051-0.151 mm;
• front and back faces are processed identically;
• after the end of the cycle, the finishing process should be implemented, that is, clean the surface with "zero" sandpaper.

The work on creating a new configuration requires adherence to regulations and has its own complexity.

• Read the requirements, in particular, check the number of revolutions. It is clear that for metal this figure will be noticeably lower. Wooden elements are processed at a high speed.
• The material from which the solders are made can withstand heavy loads, its service life is significant, but even it sooner or later gets defects, chips and cracks appear.
• A sure sign that the material is beginning to "get tired" is the appearance of micro-burrs and roughness on the surface. After a while, defects will appear in these places.

To correctly implement sharpening, you should know what teeth are:

• straight;
• a bevel tooth from the back;
• trapezoidal;
• in the form of a cone;
• concave.

How to sharpen:

• clean the disc thoroughly using alcohol or chemicals;
• all work planes are processed;
• removing metal is permissible 0.051-0.151 mm;
• sharpen, perhaps no more than twenty-five times;
• you can sharpen with a special file, if there is practical experience;
• It is recommended to sharpen carbide teeth on separate equipment;
• victorious solders can be "taken" only using a special machine in which there is a diamond wheel.

There are several types of tooth settings.

• Wavy, each tooth is straightened at a certain angle of inclination, thus, a semblance of a wave appears.
• Protective, two teeth have tilt angles, the third tooth is present without tilt. This method is effective even with mahogany and oak.
• The classic, when the teeth are variable - the angles of inclination to the left and right.
• Frontal.
• Rear.
• A slope is made at the frontal plane.
• A slope is made at the back plane.

There is one more parameter - this is the angle of sharpness, but it usually "works" as an additional tool.

For manual sharpening you will need:

• wooden blocks (2 pieces measuring 52x32 mm);
• drill, screwdriver;
• screwdriver crown;
• a hacksaw for processing ceramics;
• marker;
• ruler;
• screws or screws.

The surface of the stand is the same as the surface of the disc. The circle lies on a stand, the sharpening plane should be at an angle of 90 degrees to the saw blade. Such a simple device is equipped with a swivel unit. This secure fixing allows all the teeth of the tool to be machined evenly. With the help of a marker, you make markings, which makes it possible to correctly determine the angle of inclination.

All equipment that provides sharpening has one principle of operation. Differences are only present in the performance of the equipment.

The tool kit includes an abrasive wheel and a grinding material.

Using machine tools to sharpen your teeth has a number of advantages:

• the ability to adhere to a given angle;
• increases the efficiency of production operations and their speed;
• it is possible to use a variety of discs.

The machine can even work with hard metal coatings. Grinding wheel grit varies. As an example, we can say that if the diameter is 126 mm, then the speed can be 2300 rpm.

The speed of rotation of the disc can deviate within the range of 510-720 rpm, it all depends on what coefficient of fragility the disc has.

The functionality of the installation determines whether the workpiece or the spindle will move. The movement of the entire device is also possible.

The angle of inclination can be measured using a pendulum goniometer; some units have a built-in scale to determine the angle of inclination of the teeth.

Teeth are usually sharpened first from the front, then from the rear.

The units have circles of the following parameters:

• thickness from 15 to 42 mm;
• outer diameter 11-252 mm;
• mounting hole (16, 20, 33 mm).

Much depends on the performance characteristics of the abrasive; special attention should be paid to them.

And finally, a few tips from experts:

• the frontal part should be monitored more closely;
• when working with massive elements, the lateral planes are exposed to heavy loads;
• rounding along the radius no more than 0.21 mm;
• the teeth are best processed both from the front and from the back;
• metal removal parameters should not exceed 0.151 mm;
• the disc is cleaned before starting work, you should also check all the corresponding corners;
• sharpening teeth at the right angle requires practical experience; in the absence of such, it is better to take the disc to a workshop;

• circles on which there is diamond dusting should be cooled with a special coolant liquid;
• the unit designed for sharpening circular knives is capable of working with the workpiece only in one plane;
• the teeth must not be allowed to wear out before rounding by more than 0.21 mm, otherwise it will be difficult to make a normal sharpening;
• usually the disc has a resource of no more than 36 sharpenings, and it does not matter on which unit the processing takes place;
• it is important to ensure that the metal during processing does not receive defects (chips, cracks, notches), their appearance can provoke further destruction of the material.

How to sharpen carbide-tipped circular saws is the next video.