Drill-crown for wood device and principle of operation. Video review, crown test. How to use it?

A circular saw for wood, which is also called a crown, a crown drill or an end mill, is made in the form of a cylinder, one edge of which ends with a shank, and the second has a serrated cutting edge. The cutting head is made in the form of a single cylindrical edge with sharp teeth. This device serves as a nozzle for the torsion elements of drills, drills, screwdrivers designed for manual work. It is possible to use circular cutters for machine tools as well.
The crown is installed in a special glass, fixed with a nut. Included with each circular saw is a drill that protrudes beyond the line of cutting teeth, which allows you to accurately determine the center of the hole and ensure a perfectly smooth cut.
The crown can be either a monolithic structure - a cylinder with a serrated edge, or a collapsible one - cutting rings of different sizes are inserted into a round landing socket.
If it is necessary to make a perfectly correct and clean hole, bimetallic crowns on wood are used. They are made of high-strength steel and cobalt. This connection makes the tool durable in operation.
Five crowns on wood. It is used for drilling holes of different diameters in wood, drywall, plywood, chipboard, laminated board, plastic. It is used in the installation of electrical switches, junction boxes, lighting accessories, as well as in the laying of plumbing and sewer pipelines.
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