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After mounting, the specimen is wet ground to reveal the surface of the metal. The specimen is successively ground with finer and finer abrasive media. Silicon carbide abrasive paper was the first method of grinding and is still used today. Many metallographers, however, prefer to use a diamond grit suspension which is dosed onto a reusable ...
John Wilde's The Great Autobiographical Silverpoint Drawing (Art Institute of Chicago 1986.8) which is 38 in × 91 in (97 cm × 231 cm), one of the largest modern silverpoints. Silverpoint was also used in conjunction with other metal points by 20th-century artists.
Grinding uses an abrasive process to remove material from the workpiece. A grinding machine is a machine tool used for producing very fine finishes, making very light cuts, or high precision forms using an abrasive wheel as the cutting device.
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Until around 1820 copper plates were the common medium used for engraving. Copper, being a soft metal, was easy to carve or engrave and the plates could be used to strike a few hundred copies before the image began to severely deteriorate from wear. Engravers then reworked a worn plate by retracing the previous engraving to sharpen the image again.
Lapping machine. Lapping is a machining process in which two surfaces are rubbed together with an abrasive between them, by hand movement or using a machine.. Lapping often follows other subtractive processes with more aggressive material removal as a first step, such as milling and/or grinding.