Grinding machine with abrasive wheel or pot tool - which is rotated at high speed, esp. for inexpensive drilling of holes in reinforced concrete

摘要

The grinding machine is provided with a driven spindle which rotates at more than 5000 rpm. On the spindle is an abrasive tool, disc or pot, which is made of pure alumina (synthetic corundum) mixed with any desired amt. of silicone carbide. The tool may also be made of only alumina or SiC, and may contain binders and other materials. Esp. for drilling holes in concrete which contains reinforcing bars etc. made of iron or steel. Holes can be rapidly drilled in concrete for an incredibly low price, instead of using costly drilling tools and/or welding burners.