In the world of welding, this grinder is not good. If you're not used to properly grinding tungsten, this tool is just great. If you're used to welding with properly grounded tungsten electrodes, this is terrible. If the tungsten has been ground properly, the "scratches" from the grinding should reach the tip. If the grinding wheels twist or form rings, this disturbs the welding arc. This photo compares two tungsten welds, one with a 6 inch OD wheel and the other with a dremel-style diamond…