How to Sharpen Hand Circular Disc
A circular saw is a universal tool that can work with a wide variety of materials. From wood to plastic and sandwich panels. But for the cut to be smooth and without chipping, a competently selected blade for a circular saw is required. Note that there is no universal disk suitable for all materials, since each product solves its own problems. In addition, you should not save money when buying products of an unknown brand. This is primarily unsafe.
Types of saw blades
All saw blades are divided into two types:
- Monolithic are made of solid metal and are distinguished by sharpened teeth. They are popular due to their affordable price, the possibility of recovery, that is, re-sharpening. On the other hand, monolithic products wear out faster.
- Tungsten carbide blades for hand-held circular saws are more reliable and durable, as they are equipped with sharp brazings made of cobalt or tungsten carbide on the teeth. Due to the use of carbide materials, the products are more durable and reliable, however, if the disks become dull, it will not be easy to restore them.
The shape of the teeth matters!
When choosing a saw blade, you should pay attention to the design features of the products, the location of the teeth, their shape:
- Straight, straight teeth are suitable for cutting chipboard, wood, plywood or aluminum;
- Alternating alternating teeth handle the sawing of soft and hard wood or plywood, as well as with transverse cutting;
- A circular saw blade with trapezoidal teeth can be used when working with chipboard, soft non-ferrous metals, plastic. Due to the special shape of the teeth, the material is not split, and the cut itself is carried out in two stages. First a rough cut is performed, then the edges are trimmed;
- The teeth can have a positive or negative bias: the first is needed when sawing workpieces with thick, the second. With thin walls;
- Rare teeth with deep cavities between them provide a good longitudinal section of the wood, while sawdust is easily removed;
- Small, closely spaced teeth allow transverse cutting of materials. The most convenient among these types is the circular saw blade, each tooth of which has a special protrusion at the back. Due to this design, cutting is quick and even.
Before you select a particular drive, you need to solve a few issues for yourself.
Are the technical data consistent?
Each saw blade is selected for a specific type of circular saw. Therefore, when choosing, it is worth considering the power of its engine, the spindle speed, and the diameter of the landing pin. A circular saw blade with a large number of revolutions and teeth with a negative angle of inclination will exert a large load on the engine. Therefore, you should definitely find out what the capabilities of your saw are. It is worth remembering that each saw has a landing diameter, so the disc must also correspond to its size. The choice of a saw blade requires attention to such information as the series of the blade, its design and external size, the diameter of the bore hole.
How will you cut it?
The saw blade for a circular saw should be selected taking into account the type of cut. It can be transverse or longitudinal. In addition, the materials you plan to saw play an important role. Wood, plastic, chipboard, non-ferrous metals, pipes. We note one thing. Each series of disks is designed specifically for certain types of work.
The quality of the blade blade directly affects the sawing efficiency. A good canvas is created by laser cutting, and balancing is done on a computer. Grinding of each disk is carried out separately. A high-quality cloth in the light will reflect traces of the grinding tool. If the blade is roughened and looks rough, such a circular saw blade for a circular saw will not provide work efficiency and will dull faster.
We take into account the diameter
Each saw has its own dimensions, and therefore the equipment for it must be chosen taking into account this parameter. The diameter of the discs is important, because if the diameters are different, this will lead to losses. So, the cutting depth depends on the outer diameter. Experts say that the cutting depth above the workpiece should be minimal: in this case, the cut will be better, the heating will decrease, and the load on the engine will be minimal. It is important that the disk snaps firmly on the seat pin.
Count the teeth
Among the most popular tools in the arsenal of a home master. A circular saw. The metal disc for it should be selected taking into account the number of teeth on which the speed and purity of cutting depends. If there are a lot of teeth, then the cut will be fine, however, the load on the engine will increase, and the chips will be harder to endure. With a small number of teeth, the cut is rough and rough, but the chips are easily removed, and the cut is faster. A large number of teeth is considered 80-90, a small. 10-40.
How to sharpen?
Like any other tool, the saw needs timely care. The most crucial moment is the sharpening of the disks for a circular saw. Experts note that the carbide tooth wears out along the main upper except, and if massive workpieces are sawed, the side faces quickly wear out. Excessive blunting of the saw should not be allowed, as it will be less productive, and not the fact that it will be possible to sharpen the discs.
Proper sharpening involves ensuring the proper sharpness of the cutting edge. If you sharpen them on one front plane, then the number of sharpenings will be less. Many owners of such tools are interested in how to sharpen a circular saw blade. And it depends on the material of the teeth. Sharpening is most often performed on a circle made of elbor or green carbide or based on diamond wheels. It is advisable to use Elbor wheels when sharpening saws made of high-speed steel, and diamond wheels for carbide cutters. For sharpening to be quick, but less affect the degree of wear, it is worth choosing diamond wheels with the greatest grit.
For sharpening, you can use machines that have different functionality. The most complex and expensive models are ways to provide automated sharpening. When sharpening, teeth should be bred: if this is done incorrectly, then during the cut there will be a burning smell, extraneous noise, and the material itself will move with jerks, which is not very convenient.
In general, the condition of the disks should be monitored constantly, since their wear will affect the increased load on the mechanisms and sooner or later lead to its complete failure. Thanks to regular sharpening, you can extend the life of the equipment, improve productivity and reduce the time for the cutting process itself. If after sharpening the cut remains sloppy, and the material moves unevenly, then more attention should be paid to the location of the teeth.
How to choose saw blades? This is easy to do if you follow a few rules:
- Find the diameter of the bore hole and the outer diameter of the blade on the label — they must meet the specifications of your saw.
- Pay attention to the thickness of the disc: thin ones provide a good and clean cut and are used when working with valuable wood species, while thick ones are advisable for rough cutting of materials.
- The disc must indicate what the maximum permissible speed is. A low speed will allow you to develop a high cutting speed, but will lead to a deformation of the disk and poor-quality saw.
- Evaluate the quality of the blade blade: if it is good, then the cutting plane will be smooth, without roughness or flaws.
And most importantly. Keep an eye on safety and choose saw blades that are designed for a specific type of saw. And think about where to sharpen the circular saw blade if you cannot do it on your own.