Industrial equipment supplier Dowson & Dobson Industrial (D&D) will, on June 1, introduce a new range of hand-held tools that make use of turbo air motors, which are better suited as a drive for standard air tools than electric motors.
An air motor has a high-performance density, which is only about one-fifth of the mass and one-third of the size of an electric motor.
The industrial air tools range, manufactured by Deprag Industrial, a subsidiary of Germany-based machine building company Deprag Schultz, comprises turbine and vane motors and includes grinding machines from the smallest grinder with a speed of 100 000 rpm to a heavy-duty angle grinder with a grinding disc diameter of 230 mm and polishing machines suitable for polishing and grinding flat or curved surfaces.
Further, the range includes drilling machines that range from hand-held drills in a pistol design to an extensive series of drilling machines in straight design and angle drills of between 170 W and 3.5 kW for the steel industry.
M6 to M36 impact wrenches for fast and easy handling when loosening or tightening screw joints in series, hammers that range from chisel hammers for sculptors to high-power jackhammers for road building or quarries, pliers and sheet-metal machines are also included.
The D&D grinding range consists of a grinding machine with turbine technology, which ensures optimal power density. “Our 125 mm angle grinder offers 2.2 kW of power, while similar-sized conventional electric motor tools provide only 1 kW of power,” says D&D sales manager Johan Janse van Rensburg.
The turbine grinding machine features a 125-mm-diameter grinding disc and weighs 1.8 kg.
It also has a 14 mm spindle thread, which enables users to use the wheels on an electrical or on a turbine grinding machine.
The advantages of turbine-powered air tools over vane motor tools include high-speed no-wear parts, low air consumption at idling speeds, lighter weight, instant load achievement and a low noise level, Janse van Rensburg explains.
Vane motor air tools are more suited to smaller applications as a result of the smaller motor diameter.
“A major benefit of turbine motor air tools is that the motor rotates without creating surface tension. This greatly increases the durability and longevity of the tool,” he adds.
Because of the high power load of turbine air tools, pinion gears are made of steel, as cast iron gears, which are used in standard electrical and air tools, are unsuitable and will strip or break.
Turbine motors also eliminate the need for lubrication, which is used in vane motor air tools. “As turbine air tools do not have vanes, the need for lubrication, such as oil, is eliminated and the need for maintenance is greatly reduced,” Janse van Rensburg explains.
Turbine air tools are suitable for use in foundries to fettle castings and are not affected by the excessive dust in these areas.
The tools are also used in copper foundries, where electrical tools cannot be used, as well as in steel mills for the cleaning of slag and to fettle continuous castings.
Construction companies also use air tools to take off the excess welding spatter from metal surfaces.
“While air tools are more expensive than electric tools, they are more durable and have a much longer life span,” says Janse van Rensburg.
D&D also plans to extend the turbine air tools grinding range from five inches to nine inches, says D&D director Terry O’Kelly.
The tools are manufactured in the Czech Republic.
“This range gives us a new angle into the market and opens many opportunities for continuous growth,” says O’Kelly.