This research focuses on the tightening work of the workpiece to the vise, which is the sensory work in milling operation. First of all, regarding the tightening method, a simple device was introduced to visualize the tightening force by means of engineering measurement, so that the force level could be quantitatively evaluated. Using this device, the present situations of the tightening sense of the vocational training instructors and the level of students’ trained skills were investigated and analyzed. In addition, the visualization training has been proposed and practiced, where students experience the delicate sense of the tightening force adjustment of the skilled instructors quantitatively and visually. Based on the experimental results, it is verified whether visualization training would allow students to quickly acquire intuitions and tips on tightening skills. It is also confirmed whether visualization training would be effective in acquiring stable and advanced skills.
https://ror.org/02f0psx94 
