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By T. Sanponpute, P. Chantaraksa, N. Saenkhum and N. Arksonnarong


(NIMT) has designed and developed suspended-fulcrum torque standard machine. The main design is to replace air bearing with the 30-μm-sheet metal as a fulcrum. The advantages of the design are the lower cost and maintenance than air bearing-fulcrum type. The experiment was done to evaluate the sensitivity of the suspended fulcrum, which is directly affected by the bending stiffness of the thin metal sheet. Also, the different between left and right arm length is calculated from the trimmed mass used for equilibrium balancing at each applied torque. Finally, all the uncertainty of fulcrum, weight set and arm length are used to calculate the relative expanded uncertainty of torque measurement, which is 5×10-5

Year: 2009
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