A diamond blade is composed of two fundamental elements: a steel plate and a diamond-impregnated segment. The latter may have a number of appearances: the segmented rim, the continuous rim, the castellated rim.
The steel plate is of very high quality, treated, hardened steel. Slots separate the segments which contribute to the cooling of the blade during sawing by allowing the water (wet cutting) or the air (dry cutting) to flow between the segments. They also allow the blade a certain amount of bending during cutting. The segments contain a mixture of diamonds and metal powder. During the manufacturing process, the metal powder and diamond mixture is compressed at a very high temperature in order to obtain a solid metal alloy which holds the diamonds. The segment or rim is slightly wider than the steel blade to allow the attacking edge to penetrate the material without the steel blade rubbing against it.
In a diamond tool properly suited to the material to be cut, the equilibrium between the work of the diamond and the abrasion-resistance of the bond is optimum; the diamond is held in place until it is destroyed and new crystals appear. It is in this equilibrium that all the quality of the diamond tool resides. A blade intended for cutting hard, dense (less abrasive) materials requires a softer metal matrix. This wears out more rapidly, by replacing the worn diamonds relatively quickly so that the blade continues to cut. A blade intended for cutting soft, abrasive materials must have a hard, abrasion-resistant blade in order to retain the diamonds longer.
Castellated rim with super-butt-jointed segments.
Continuous castellated rim.
A diamond blade does not cut but works by milling. During the sharpening process performed at the factory, individual diamond crystals are exposed on the face and sides of the segment and it is these that do the milling work. The metal matrix holds each diamond in place. During the work, each diamond is supported by a comet’s tail which strengthens the supporting action of the bond immediately “behind” the diamond crystals.
The diamonds exposed in this way cut into the material reducing it to fine powder.
During cutting, the exposed diamonds may crack or break (all the more rapidly, the harder and denser the material).
Simultaneously, the material starts to wear out the metal matrix in the segments by abrasion, which allows the gradual release of new diamonds.
Determine what is most important to you: the purchase price of the tool or the cost per cut. For less important jobs or for occasional use, a cheaper tool may be the right choice. For more important jobs or for regular use, a more expensive tool with a low cost per cut (per square metre) is preferable as it provides better results and performance.
The correct identification of the material you are going to cut is the most important factor when choosing a tool. The material has a direct influence on the cutting speed and the service life of the tool. Throughout the catalogue you will find tables explaining the various applications of the diamond tools; these should help you choose the most appropriate tool for your work.
This choice may depend on the user’s preference or on some particular constraint associated with the work to be done. For concrete saws, wet cutting is preferable as it allows deeper cuts and prolongs the service life of the blade. For tile and masonry saws, dry- or wet-cutting tools may be used equally well. For general purpose site saws, dry-cutting tools are most frequently used. Wet cutting is used primarily to limit the amount of dust. If you experience problems with wobbling when using a high-power handheld machine cutting dry, try wet cutting. This will cool down the blade and solve the problem. Some diamond blades and drill bits, such as Galaxy, must be used together with water. Dry-cutting tools may be used with or without water, depending on the machine and the material to be cut