Grinding discs are metal treating tools for rough and clean treatment of metal items or other relatively hard materials. Besides those grinding wheels, there are tools used for hand and stationary machines: blocks, oilstones, segments etc.
In spite of tools and materials for polishing, grinding tools have cutting edge of abrasive crystals. Cutting edge of the wheel is characterized by durability, strike viscosity, height and flexibility. Application of tools depends on hardness of abrasive material. The harder the material is, the wider the range of treated materials is.
While using too soft abrasive for hard materials (talc or emery for hard steel or superalloyed steel) there is high wear of the disk. After this process the applied surface is with high cleanness of treatment, however, the grinding is not precise.
If using tools with too hard abrasive grain for treatment of soft materials (for example, white aluminum oxide or boron carbide for copper or aluminum) the treatment is carried out well, but the disk is jammed with cutting waste.
That is why some users try to use wheels with weak bond (this way is not economical due to high waste of expensive abrasive) or to clean the result with a “diamond” (this way is not enhance economy as well). A “diamond” is a tool for wheel correction, i.e. for deleting curves from wheel surface and deletion of abrasive layer jammed with cutting waste. A classical diamond is a small block of tiny crumb of technical (usually synthetic) diamonds with tungsten bond, aluminum and copper. For a stable fixing of block there is a metal handle.