Скачать или смотреть Preform - Gem Sawing and Preforming (Cabochon) Machine

Starting from sawing to sanding of a gem stone performed by this combo machine. Required a circular sawing blade and different preforming wheels for each step.

PREFORMING
Grinding, usually with silicon carbide wheels or diamond-impregnated wheels, is used to shape gemstones to a desired rough form, called a preform. Water or oil used to remove debris and prevent overheating.

Preforming Wheel : Typically 6 inches very coarse diamond or silicon carbide, such as #60 or #100 preform wheel is used for rapid removal of stone.

SANDING AND POLISHING (BY HAND)
Sanding is similar to preforming but uses finer abrasives. Its purpose is to remove deep scratches left by coarser abrasives during preforming. Since it removes material less rapidly, it also allows more delicate control over final shaping of the stone prior to polishing.

Sanding Wheel : Typically 6 inches finer abrasive #600, or #1200 preform wheel is used for final shaping and sanding. #1200 also used for polish the stone with hand.

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