抄録
Scraping is manual finishing process for machined surface to obtain an ultra-high precision surface. Machined surface is shaved off by a thickness of a few micrometers from the surface with a manual tool like a flat surfaced chisel. The high level skill of expert is necessary to reduce a processing time and a processing cost required for scraping. This study evaluates skill levels of workers by measuring the processing force that a scraper gives to a workpiece during the scraping work. To scrape off necessary quantity exactly and efficiently, it is necessary to add force to the tool so that the cutting edge draws a circle. Therefore, it is necessary to synchronize a force to push the cutting edge forward and a force to push the edge downward. This study shows that the skill levels of workers can be evaluated to quantify a sense of rhythm of worker from a force waveform.
