Calibration of reference torque wrenches using a 10Nm deadweight torque standard machine

Nishino, Atsuhiro; Ogushi, Koji; Ueda, Kazunaga

doi:10.1016/j.measurement.2014.09.081

Cited by 6 publications

(2 citation statements)

References 3 publications

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“…Figure 11 shows the rod component of the 10-N·m-DWTSM, which acts as the counter loading point. An aerostatic shaft with a collar was adopted to reduce any parasitic forces [3]. The relative expanded uncertainty of the torque realized by the 1-kN·m-DWTSM was 4.9 × 10 -5 in the 5 N·m to 1 kN·m torque range [10].…”

Section: Intra-laboratory Comparisonmentioning

confidence: 99%

“…Thus, there remains a strong demand to expand the lower end of the range of the torque standard for RTWs. In a previous study, we designed adaptations that allow torque transducers with a low nominal capacity to be mounted on the 10-N·m-DWTSM to expand the torque standard range for RTWs, and we demonstrated that RTWs could be calibrated using this modified 10-N·m-DWTSM [2], [3]. The 10-N·m-DWTSM has been compared with the 1 N·m and 1 kN·m TSMs developed at the Physikalisch-Technische Bundesanstalt (PTB, Germany) by calibrating low-nominal capacity TMDs in the range of 0.1 N·m to 10 N·m, and the torque realized by the 10-N·m-DWTSM at NMIJ was found to be equivalent to that realized by the two TSMs at PTB [4].…”

Section: Introductionmentioning

confidence: 99%

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Confirmation of calibration capability of low-nominal capacity reference torque wrenches at NMIJ

Nishino¹,

Ogushi²,

Ueda³

2017

ACTA IMEKO

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The calibration procedure for a reference torque wrench (RTW), which is a torque transducer in the form of a torque wrench, is based on the JMIF-016 (TTSG-W102) technical guideline in Japan. The mounting position of an RTW is set to three directions (0°, 120°, and 240°; case 1) when it is calibrated using dead weight torque standard machines (DWTSMs) with rated capacities of 1 kN·m (1-kN·m-DWTSM) and 20 kN·m (20-kN·m-DWTSM). However, the mounting position is set to three different directions (0°, 90° and 270°; case 2) when the 10-N·m-DWTSM is used. In this study, the effect of the difference of the RTW mounting position on the calibration results was investigated. Next, to confirm the equivalence of the RTW calibration capabilities of the 10-N·m- and 1-kN·m-DWTSMs, they were compared using two low-nominal capacity RTWs. The results obtained in cases 1 and 2 showed good agreement within the uncertainties. The recommended RTW calibration procedure is based on case 1. But, if an RTW cannot be mounted in the 120° and 240° directions because of the space problem, case 2 can be adopted as the RTW calibration procedure. The RTW calibration capability of the 10-N·m-DWTSM was found to be equivalent to that of the 1-kN·m-DWTSM in the range of 5 N·m to 10 N·m.

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Section: Intra-laboratory Comparisonmentioning

confidence: 99%