Final Report on Torque with Cross Force Comparison No. MT01 ...

<strong>Final</strong> <strong>Report</strong> of MT014. Measurements4.1 Measurement processParticipants verified the torque calibration devices and reported the relativeuncertainty, environment condition of measurement and the creep effect result of eachdevice.The comparison of each point is carried out by one transfer wrench consisting of10 points: 40 N·m, 60 N·m, 80 N·m, 100 N·m, 150 N·m, 200 N·m, 250 N·m, 300 N·m,350 N·m and 400 N·m and carried out both clockwise and anti-clockwise direction. Themeasurement process is shown in the diagram of figure 5.PreloadResetResetResetMiddle lever arm lengthFigure 5. Measurement sequence.MinimumLever arm length4.2 Metrological investigationGenerally, the creep quantities depend on each mechanical loading design andapplied torque capacity. In practical, the dwell time of torque application should belonger so that the creep effect can be released; however it is still ambiguous. Theobjective of this investigation is:- Explore obviously creep behavior.- Look for the possibility to ignore this quantity in uncertainty budget.- If it cannot be ignored, properly estimate.The creep effect is measured at full load of each standard as a function of time byrecorded every 1 second and 5 minutes in a row. The result is recorded automatically inelectronic file (text file) by using SENDLOG program.9