Essentially, the lapidary would take a piece of metal of varying hardness (lead, tin, or copper) and apply oil or water mixed with an abrasive (diamond powder, emery powder, or an oxide) in order to cut and polish the gemstone. This was the only method of cutting stones for 500 years.
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Get PriceAug 28, 2012 Manipulating bulk material at the atomic level is considered to be the domain of physics, chemistry and nanotechnology. However, precision engineering, especially micro-machining, has become a powerful tool for controlling the surface properties and sub-surface integrity of the optical, electronic and mechanical functional parts in a regime where continuum mechanics is left behind and …
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Get Price8.3.2.2 Ball mills. The ball mill is a tumbling mill that uses steel balls as the grinding media. The length of the cylindrical shell is usually 1–1.5 times the shell diameter ( Figure 8.11). The feed can be dry, with less than 3% moisture to minimize ball coating, or slurry containing 20–40% water by weight.
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