brasive grinding four stages of

Our approach is the choice of grinding one of the oldest countries, as in the ancient science masterpiece "Heavenly Creations" in there "cut, consultation, cut, grind," the idiom, while during "grinding" refers Sanding Sheets  to the grinding.
In fact, going back to the earliest human use of grinding primitive society, in the matriarchal society, everyone has begun to use the most simple stone tools, which are the most simple stone is a stone with a simple conflict between come. We use these most simple things hunting, planting. Then of course, everyone's wearing a simple, but still have a blade's adjuvant, which is inseparable from the grinding.
When a man named Wei Cui Liang Xi creation mill, used for processing food, Jin Liujing Xuan Xi can be used together to create a functioning eight natural rock disc of stone; Tang Shi Tao presents a mill and grinds, these abrasives are Changzhi in Shanxi County, "Wang Chen," tomb unearthed. Britain at the end as early as the Song Dynasty scholar surveys exist nine  abrasive fibre disc speed grinding; thirteenth century that division in the Yuan Dynasty, Chinese people have begun to use natural gum will stick and non-metallic shell powder grinding data one of the countries, from the most primitive has been continued until the early nineteenth century, before the grinding process can be considered to carry out the first stage of history. This phase is characterized by the use of abrasives and machinery are relatively simple.