Quality and Reliability

Our product range

BSW-tools are known because of their highly engineered geometries and innovative cutting materials. Best performance and tool-life is guaranteed. By using our solutions your production can be optimized and down-times reduced. This protects your machines and reduces the costs for maintenance work.
BSW precision-tools are produced under the highest production and quality demands. Our most modern measurement and testing technology and our quality-management guarantee you the safety to get the best possible planning and production reliability.


CBN is the hardest material after diamond:

Diamond which is the hardest known material couldn’t be used in ferrous machining applications because of the chemical reaction which turns the diamond into graphite. By developing CBN, a bigger application range was created. Being the 2nd hardest material CBN can hold the hardness of carbide from 25 degrees in temperatures up to 1000 degrees Celsius.

Similar to PCD the bonding between crystals effect a randomly oriented and homogeneous structure. This composition of a tough carbide layer and a brazed CBN cutting edge gives the CBN-insert the ability to resist high cutting speeds and cutting forces. This is the reason why CBN can also be used in heavy interrupted cutting applications.

The CBN-layer has also a much higher conductivity in comparison to carbide and ceramic, in turning and milling applications the heat is absorbed much faster. During the machining process of hardened, abrasive and tough materials high temperatures are created which cause a weakness or deformation of conventional cutting materials.

CBN keeps the toughness, tensile-strength and is chemical inert to metals like Iron, nickel and cobalt up to temperatures of 1000 degrees Celsius.


Diamonds, the hardest material in world:

Back in 1955 scientists developed diamonds in jewelry quality. With physical properties and sizes up to 1 carat, these synthetic diamonds had never been seen before. Containing 99,9% graphite isotope C12 these diamonds conduct heat 50% faster than natural diamond and 850 times faster than copper. They are known for the best heat conductivity and have a very high resistance against breakage when used in high-energy-lasers. But to use this diamonds for jewelry is not economical because the production is very expensive and their properties are better used in technical applications.

Since 1958 synthetic diamonds are produced based on graphite in a huge high-pressure and temperature press under 60-70 kilo bar and temperatures around 1200-1500 C. Through the years this process was continuously improved. Synthetic diamonds and later cubic-boron-nitride which is produced in a similar way is the bases for polycrystalline cutting materials. These materials are used to machine different work piece materials like stone, wood, synthetic materials and non-ferrous materials. Nowadays it’s impossible to imagine machining difficult work piece materials without these „polycrystallines“.

In the beginning the main objective was the developing of grinding materials. In 1972 the technology was found to bind these only a few micron in size in a special matrix and produce polycrystalline cutting edges. About one year later this technology was transferred to cubic-boron-nitride.

The polycrystalline structure is randomly oriented and homogeneous. The hardness and wear resistance is consistent in each direction. This is a main difference to natural single crystal diamonds which have harder and softer areas which could be the source for cleavage crack initiation. This means that a specific orientation of the cutting edge is not necessary to obtain high and consistent tool life.

When using cutting materials such as carbide or ceramic and the tool-life requirements are not realized, polycrystalline cutting materials can be the solution. By using advanced cutting materials, improvements to cutting parameters and tool-life because of higher hardness and wear resistance could be realized. Especially if high cutting speeds, tool-life and precision are required PCD and CBN can service big advantages.


With its wear resistance and tool life CVD exceeds the cutting material PCD.

CVD also has a higher thermal and chemical stability.

CVD-D Diamond is basically different in his structure and also in his manufacturing process. In a special CVD – process (chemical – vapour – desposition) are smallest diamond crystals deposed on a basic material in order to grow them to a high tense polymer diamond substrate.

Due to a lack of binder matrix the share of Diamond is higher than PCD. The disadvantage that comes up compared to PCD – the fracture toughness is lower.