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Torque Guns… Nut runners… Powered Torque Multiplier
They go by different names but essentially they do the same job. They apply torque to fasteners through a set of gears and allow for a continuous run down, as opposed to the advance/retract cycle of hydraulic tools. This can make bolting operations much quicker on the lower end of the torque spectrum between 500-8000 lb-ft, but they have not extended into the higher end like hydraulics to can, which can exceed 40,000 lb-ft.
These powered torque multipliers generally come in 3 different motor configurations pneumatic, electric corded, and battery-powered. All 3 of these motor configurations come with their pros and cons and are suitable for different applications.
Air Multipliers
These were some of the first powered multipliers created and up until recent years were still the most popular. These air-driven tools still offer considerably more torque (up to 8900 Ft. Lbs) than their battery-powered alternatives and are also intrinsically safe for classified work areas. They are rugged and can take a beating, however, they do require an air compressor and a Filter/Lubricator assembly to operate. The other downside to air multipliers is that the torque output is directly related to the pressure and volume of air being supplied. If you have an inconsistent air supply the output accuracy can be affected. To help with this the Plarad DP-1 can be fitted with a TC1 direct reading transducer to measure the torque applied and record the readings.
Electric Corded Multiplier
The variation of the powered multiples to evolve was the electric corded multipliers. One big advantage they have over air models is they don’t require an external air compressor and filter/lubricator assembly. These tools also provide higher torque models like the air tools but tend to perform most consistently due to inconsistencies with the air supply. The Plarad DE1 provides models up to 8900 Ft Lbs, which is similar to the air tools, but like an air hose, the cord does limit the portability when compared to a battery tool. The other downside is that the electric tools tend to be the heaviest of the 3 options.
Battery Powered Multiplier
Battery-powered multipliers have quickly become the most popular of the 3 types of powered multipliers. Plarad has been making mechanical multipliers for more than 60 years, but only started making battery-powered multipliers in 2017. The company’s first model, the DA2 battery-powered torque multiplier, is designed for use in a variety of industries, including construction, mining, oil and gas, and wind energy. They are lighter than corded electric tools and offer the best portability.
The wind energy sector was one of the first industries to drive the development of these tools due to the work being at such great heights. Due to these tools being so popular, they have seen a great deal of effort being put into the evolution of the tool. The drawback to using this type of tool is that the duty cycle is directly related to the battery capacity, and to try and keep them lightweight they give up some of the durability gained in the air tools.
In conclusion, each type of powered multiplier has its advantages and disadvantages that make it more or less suitable for a specific application. If you have any questions about which tool is right for your application, please contact us and we would be happy to help.
Summarized by Scott Fong
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