Torque screwdrivers are often used in cases where one needs to tighten a smaller fastener. The Goldilocks zone of tightness is ensured using tools such as torque wrenches. The screws must be tight enough to hold the electrical components together, but not too tight as to damage them. One proposed application of ENTR’s abilities would be screws in electrical components such as night-vision goggles. Many threaded fasteners such as screws, bolts and nuts require a specific amount of torque to be applied to ensure they are tight enough, but not too tight. Traditional strain-gauge torque transducers are transfer standards with uncertainties of approximately 0.25% of torque measured, while ENTR has 0.1% uncertainty or less. By contrast, the ENTR approach does not require mass and length standards to realize torque, and instead utilizes standards of voltage and resistance traceable to the present definitions of the SI.ĮNTR is intended for use in calibrations laboratories that already have voltage and resistance standards, lightening logistical burdens and increasing operational efficiency.įurthermore, ENTR can outperform most low-range commercial torque transducers currently on the market. This process often necessitates shipment of heavy mass sets from the end user to calibration labs and then back again. Present torque calibration processes require regular calibration of both mass and length artifacts. It’s designed for realizing torques ranging from 0.25 to 3 inch ounce-force (0.0018 to 0.02 Newton meter) with plans to expand the operational range to 142 inch ounce-force (one Newton meter). Current passing through the coil generates a magnetic field that causes the rotor to twist.ĮNTR utilizes a commercial voltmeter, current source and data acquisition system along with custom electronic and mechanical components to generate torque traceable to the quantum-electrical SI to calibrate torque tools, among other uses. Between the disks is a plate electromagnetic coil. Two disk-shaped permanent magnets are mounted on a central rotor. ENTR realizes torque in the horizontal plane. The device, known as the Electronic NIST Torque Realizer (ENTR), is analogous to a Kibble balance that realizes mass vertically by balancing it against the force generated by an electromagnetic coil inside a cylindrical permanent magnet. Air Force, has designed and developed a tabletop-sized, self-calibrating proof-of-concept device for realizing torque traceable to the revised SI. Instead, the Kibble principle can be adapted from its primary use of realizing the kilogram to realizing torque with electromechanical force measurable in electrical units.
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