Abstract
The feeling of a wood-screw tightening using a screw driver has been examined. As a result, The screw driver cam be rotated when the screw driver bit size is smaller than the cross-grove size of screw head. However, the operation time of screw closing become long as those incompatibility degree increases. It has been understood that thess cause are the stability during screw driver operation at the early stage of screw tighening. Moreover, increasing the wood hardness tends to in crease the operation time, fatigue, the feeling of a wood screw tightning and the feeling of grasping.
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