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Press release
27.11.2015  |  9442x
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Turbine powers innovative angle-grinder

Turbine drive technology saves energy and gives high output power

Sparks fly and the shipbuilding worker perspires under his safety goggles. In his gloved hands he is holding an angle-grinder. With strength and stamina he smoothes the bumps on the welded seams that join together the steel plates of the ship’s hull. It is a difficult job for man and machine, and it usually performed in piecework and multi-shift operation. The exhausting load created by the angle-grinder’s weight and its vibrations place heavy demands on a man’s strength. Any sign of fatigue in the worker has an immediate effect on the result of his work, and thus on productivity. That is why the ratio between weight and power in a tool comes into focus when selecting the right industrial tool. With their incredibly favourable power-to-weight ratio (kW/kg), the innovative turbine angle-grinders, powered by compressed air, score highly here, thus representing a convincing alternative to conventional devices.

For decades compressed air specialist DEPRAG SCHULZ GMBH u. CO has been dedicated to research into and the exploitation of compressed air as a drive system for quality industrial tools. The innovative products that emerge from the DEPRAG ideas mill always attract attention. Since then, under the brand name of DEPRAG INDUSTRIAL, the compressed air tool specialist has extended the range of innovative turbine angle-grinders to include nine different types of tool.

The success story in compressed air tools began in the 19th century in the tunnelling and mining industries. In a potentially explosive atmosphere, where a single spark can have a dramatic effect, electrically-powered tools cannot be deployed without risk, while compressed air tools can. Another advantage is that air-powered tools are 30 to 50 per cent lighter than their electrical counterparts. They cause less stress on the worker and productivity goes up. Nowadays efforts in the sector are principally turned towards improving the efficiency of pneumatic motors. And it is at this extremely topical moment that the turbine angle-grinder has been developed. This is because the turbine is a fluid dynamics machine which exploits compressed air expansion characteristics to a very high efficiency level. It means that a turbo-driven grinder requires less air compared with a vane motor driven grinder with the same power. The balance of energy is just right.

The power-weight ratio (kW/kg) comes to just half of that of an air vane motor. And Robert Pesold, design engineer at DEPRAG stressed: ”Much speaks in favour of a turbine drive over an electrical grinding machine. A comparable electric grinder with an output of 2 kW weighs in at a whopping 6.6 kg, while the turbine angle-grinder, with a higher output of 2.6 kW, weighs only 2.2 kg. The new 4.5 kW output DEPRAG turbine angle-grinder tips the scales at just 4 kg. Both power classes of DEPRAG turbine grinders thus achieve a power-weight ratio of over 1.1!”

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