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Faceting machine
A faceting machine is broadly defined as any device that allows the user to place and polish facets onto a mineral specimen. Machines can range in sophistication from primitive jamb-peg machines to highly refined, and highly expensive, commercially available machines. A major division among machines is found between those that facet diamonds and those that do not. Specialized equipment is required for diamond faceting, and faceting as an occupation rarely bridges the gap between diamond and non-diamond workmanship. A second division can be made between industrial faceting and custom/hobby faceting. The vast majority of jewelry-store gemstones are faceted either abroad in factories or entirely by machines. (Diamonds are the exception, owing to the training and specialized equipment required to facet them.) Custom jewelry is still commonly made of custom metalwork and mass-produced gemstones, but unusual cuts or particularly valuable gemstone material will likely be faceted on a personal faceting machine.
== Home and custom faceting machines ==
A number of manufacturers sell non-commercial faceting machines. Among the more common names are Ultra-Tec, Facetron, Graves and Poly-Metric, although there are many competing brands. They range in price from just over $1,000 to upwards of $4,000.
The essentials of how a faceting machine works will be explored through this type of machine. There are two major components of a faceting machine: The mast/head assembly, and the grinding wheel, or lap. A rough piece of mineral is attached to the head, and through angle, rotation, and height adjustments of the head, the mineral is lowered into contact with the grinding wheel until a facet has been ground.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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