TORQUE WRENCH CALIBRATION
USING A TORQUE METER TO CALIBRATE OR VERIFY A DYNAMOMETRIC WRENCH/TORQUE WRENCH
Specific precautions are required when using a torque meter to calibrate or verify a dynamometric wrench. In fact, most of these wrenches comprise only one lever arm which applies the moment of a force rather than a pure torque to the torque meter. In this case, the torque meter is subject to the combined action of the moment applied by the wrench and to a transversal force equal to the force applied to the lever arm of the torque wrench. Apart from its inherent effect, this force also applies a very significant interfering torque perpendicularly to the torque meter. If, by its construction, the torque meter is insensitive to this force and to the interfering torque, the measurement of the moment applied to the dynamometer will be correct. If this is not the case, a specific assembly – for example, of the ball- bearing type – is required so that the transversal force and the torque induced by it will be captured by this device.
NOTE : Spanish version /en/tecnologia/esfuerzo-de-torsion/verificacion-de-una-llave-dinamometrica