What are cut-off wheels for Bulgarians?
First of all, let's define what kind of work is performed by a Bulgarian. The list is rather limited: grinding metal, stone, concrete, tiles, bricks and wood, as well as cutting all listed materials, except wood. Some craftsmen assure that cut-off wheels for the Bulgarian exist under the tree, you can hear the claims that such disks have been used for more than a decade. Maybe so, but most masters know that a saw blade for a Bulgarian for wood is a consumable, manufactured without regulations and dangerous to life.
In general, the nozzles on the angle grinder are classified as abrasive, diamond and polishing. The first as they work sink, decreasing in diameter, because they are entirely made of abrasive chips, the disc for Bulgarians on the stone is all-metal: small particles of industrial diamond are placed along the edge. Polishing can be of two types: in the form of a ready-made version, with a cloth coating, or it can be a metal disk, to which a velcro skin is glued.
Diamond disc for the Bulgarian and its purpose
Quite a lot of information about the disc can be learned only by looking at it, as many manufacturers use color stickers as markings. For example, if you see a predominance of blue, then, most likely, the disc is abrasive, for metal, green means circles for cutting concrete. As for the first, it is perfectly suitable for both grinding and cutting, it all depends on the hardness of bonding the abrasive and the material of the included fractions.
All the necessary information can be found in alphanumeric markings. For example, "A" will mean that the main composition of the edged disk is artificial corundum. The letter "C" is placed on carbide-silicon nozzles. Numbers next to mean the size of grains, large numbers mean cutting of black metal, and those that are smaller - colored, the smallest fractions are used for cutting steel. Nearby indicated and the limiting speed of rotation, as well as the size of the discs on the bulgarian.
At the end of the marking line there is often a letter indicating the degree of adhesion of the grains, the closer to the end of the alphabet, the stronger the bundle.
As for the circles with diamond coating, they are practically not marked, except for the arrow indicating the direction of rotation, as well as the size figures. Well, and how much the disk suits you, you can determine by its appearance. In total, a diamond disc for a Bulgarian cut-off has three different versions: a solid disc or a "crown", a turbo disk and a segmented one.
Segment and "turbo" stand out most of all. The first is a petal diamond circle for a grinder, divided along the edge into individual segments by narrow slots designed for dust removal and better cooling. For the same purpose, grooves are made along the edge of the solid disk along the edge."Turbo" is equipped with end-to-end side slots with an indent from the edge, oriented in the direction of rotation. The continuous circle is best suited for wet cutting of stone and tiles, "turbo" and petal - for dry.
How do I remove a disc from a Bulgarian and replace it with another?
In the store, the Bulgarian is most often sold with a medium quality nozzle, or even a low one, so be careful while checking the tool. However, almost certainly, you, along with the angle grinder, will also acquire several exchangeable circles of suitable diameter. By the way, not all fit. The size of the nozzle sets the casing, the circle should not be after installation to it end-to-end, especially, be wider, so you would have to work without protection .
Therefore, it is better to know how to remove a disc from a calf, and not a casing. The kit for the electromechanical tool should include a special key, suitable for the grooves fixing the nuts. However, here is the misfortune, the axis on which the disk is mounted, freely rotates, and the question hangs in the air, how to change the disc on a Bulgarian. Everything is simple - there is a special button on the typewriter, pressing it, you can fix the axis, and then turn the nut counterclockwise with the key.
By the way, try not to wait until the abrasive nozzle is sewn up to this very nut, change earlier. The disc is placed in the reverse order, that is, first we place it on the axis, then press it with the nut and turn the special key clockwise. The disk must necessarily be provided with a metal edging of the hole, this is an additional protection against its breakage during rotation.