No.7（2004）1.Development of a tightening examination machine for tapping screws

Yoshihiro FUNAYAMA, Takehiro KOJIMA

This study was carried out with the goal of developing a tightening examination machine for the evaluation of tightening related reliability in order to prevent the inadequate tightening of threaded machine screws, This examination machine is used primarily for tapping screws with nominal diameters of less than 3 mm. The development involves the development of a small-size load cell capable of measuring said measurement, the composition of a device that processes load cell data, and the improvement of an electric screw-driver that is used for improving the ease of screw processes. These will be incorporated into one unit to complete the development. The tightening performance of this examination machine was examined by fastening tapping screws that possess a 3 mm nominal diameter. As a result, it was revealed that correct measurement was ensured and there were no performance related problems.

Keywords
Tapping screws, Tightening examination machine, Load cell, Electric screw-driver

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