Abstract
Scraping operation is indispensable to make high accuracy machine tools and measuring instruments. Scraping however needs not only highly professional skills but also the ability to make a scraping strategy, such as where and how far to be scraped. In general, it takes long time to master these abilities, and skillful workers are decreasing year by year. A scraping simulator which can scrape a surface in a virtual space made in a computer had been developed in the previous paper. In the simulator, a series of scraping operation, such as Marking up, Judging and Scraping, can be performed just like a scraping operator. This paper deals with improvement of the simulator, simulations for effective scraping and a concept of simulation about fitting of three surfaces which is one of the most important method for making flat surface.
