| 摘要 |
PURPOSE:To polish a wall surface of a setting groove being situated in an inward peripheral edge of an operating hole in a mechanical manner as well as make the polishing operation performable so easily and in a short time, by attaching a turning device to a peripheral edge part of the operating hole that you want to polish, while operating a polishing device from the outside of the operating hole by means of an operating device. CONSTITUTION:First, a movable fixed member 7 is adjusted for movement so as to make a turning member 8 turnable on a track conformed to the form of an operating hole you want to polish. And, an abrasive part 2b of a polishing device 2 is inserted into the operating hole 10 while a turning device 1 is attached to an outer wall surface in and around the operating hole 10, and it is surely locked thereto by dint of suction attraction of a magnet 4a. And, after the abrasive part 2 is made contact with a setting groove wall surface 11, a large disc 5a is rotated with a handle 3a whereby rust or the like on the setting groove wall surface 11 is easily and surely scraped off, thus it is polishable so as to become a uniform surface. |
