How is the sharpening of the circular saw performed?

A circular saw is a steel disk with incisors on its edge and spacing between them - sinuses. They can look like a solder alloy of harder than the substrate, or cut from the shape of the body itself. The whole row of saw blades is called a serrated wreath, and the disc is a canvas. The frontal surface of each tooth is the anterior border, and the back is called the back. The distance between adjacent vertices of the incisors is called the step. In standard saws, the entire toothed ring consists of equal pitch and height values. As a result of the work, the manual circular saw cuts the saw in the wood - a slot limited by three faces.

Sharpening the saw blade, as well as finishing its teeth with carbide taps, is performed by means of abrasive (carborundum) wheels. The method can be combined: the first (rough) procedure is performed with abrasives, and the finishing procedure with diamond tools. To preserve the hard alloy of the incisors and the properties of the grinding wheels, the preliminary treatment is carried out due to the length of the blade - along the back edge, and the thin one - along the front.

Sharpening the circular saw on the reverse side is to grind the steel part of the tool at an angle α + 6 °. A thin procedure on a plate of a hard alloy uses an angle α + 2 °, fine-tuning of that part of the plate that is adjacent to the blade - angle α. The front face is processed by preliminary sharpening along the whole length of the lamellar soldering, and the final one by the front side (provided the finishing method is used, which should be carried out with the participation of continuous cooling). However, for diamond sharpening circles on the basis of a bakelite sheaf, it may be possible to sharpen the circular saw in the nominal mode.

On modern machines that use tools of a combined type (two fractions of grains - diamonds with abrasives), the grinding is performed with continuous cooling in one pass with the removal of the allowance by 0.25 mm. There are carbide saws, where double-sided plates are used. Transposing, they work on both sides, then they are allowed to be processed to make new canvases. Such sharpening of the circular saw greatly simplifies the maintenance of the tool farm due to the centralization and consolidation of the used enterprises.

If the disc has a flat tooth on the disc, and the sharpening is done along it by parallel layers, its back angle is sharpened along the wear path of the incisor, and with a certain number of pencils, it risks becoming unacceptably small. Of course, it is possible to treat the tooth along the plane of the back strip, which will keep it tilted. But such a measure will lead to a decrease in the angle of sharpening with the known loss of precision of the tool. To ensure a constant tilt, the back face is treated in one of the three variants of laying curves: the Archimedean spiral method, a logarithmic spiral, or an arc of a circle originating from a displaced center. The last method is sharpening the widely used circular saw "Interskol".

To support the normal conditions of grinding of those sections along the contour of the tooth blade, which are in the plane of rotation of the blade or are located close to it, arrange the angle of the lateral clearance through the oblique lateral turning of the back wall of the tool (as in a conventional planer saw).