| 摘要 |
PURPOSE:To make forming of a cutter easy and to make its rotation smooth by forming a resinous grinder into a cylinder. CONSTITUTION:A core 1 as a core material for a hole cutter H is cylindrically formed with a net 2 of a glass fiber material. Also, one end of a cylindrical grinder 3, formed of a resinous abrasive with the core 1 inside, is a grinding side G and the other end is a fitting side J on a rotary shaft S. Therefore, the hole cutter H in molded with a resin and can be extremely easily formed compared with a metallic hole cutter. As he hole cutter H has no cutting edge with a rough surface, a hole A can be smoothly bored, and even when reinforcing iron bars are present in a concrete wall W, the grinding can be continued. |
