Moscow gold for Norbar
1 min read
An ultrasonic bolt meter, manufactured by Norbar Torque Tools has won a gold medal at the recent MetrolExpo show in Moscow. This is a leading event for metrology, the science of measurement, and the award was presented "for high quality accuracy of measurement, ease of use, storage and retrieval of data."
The portable meter, the USM-3 (pictured), provides precise measurements for the elongation and load in threaded fasteners and is a valuable tool for specialised applications where the exact measure of fastener tension is essential to ensure the integrity of a mechanical joint, such as applications in the aerospace industry.
Ultrasonic measurement performed by the USM-3 works on a 'time-of-flight' principle, with a small transducer placed on the head or stud end of the fastener sending an ultrasonic sound wave through the length of the bolt. The time taken for receiving the returning echo signal is converted by the USM-3 into a precise length, taking account of the material properties of the fastener plus the transducer diameter and frequency.
Calculations are shown on the USM-3 LCD display, giving easy to interpret results on load, elongation and waveform. These measurements accommodate the effects of stress and temperature variations on sound velocity, giving an accuracy that far exceeds standard strain gauges.
The company's Philip Brodey said: "We are delighted to have received this award for the USM-3, which recognises its value in precision measurement to industry internationally."
