2013 Volume 89 Issue 6 Pages 213-217
The microscopic specimen is used for an evaluation of a metal heat treating process. The surface of the specimen is prepared by hand-held polishing. Long term training is necessary to meet the quality criteria for polished surfaces. The preparation process for a microscopic specimen consists of cutting up, mounting and polishing. The proper polishing technique is acquired through a sort of intuition and long experience. This technique has been conveyed across generations in the form of tacit knowledge, without explication of the knowledge acquired. Thus, training new technicians is a difficult and inefficient process. In this study, we compared the finger force generated by expert and non-expert technicians, and verified the effect of the difference in finger force applied for the polished surface finish. As a result, finger force by the expert was sustained throughout the trial. The expert’s finger force distribution between the thumb and the middle finger was approximately uniform. The polished surfaces of the specimen prepared by the expert was more uniform in roughness.