Melchiorre 600 Plaque de cuivre pour machine à roder

Copper plate for lapping machine. Dia 600mm, NEW, make: Melchiorre, Mimu Machine Tools Gussago BS Italy, Lapping is a machining process in which two surfaces are rubbed together with an abrasive between them, by hand movement or using a machine., This can take two forms. The first type of lapping (traditionally called grinding), involves rubbing a brittle material such as glass against a surface such as iron or glass itself (also known as the lap or grinding tool) with an abrasive such as aluminum oxide, jewellers rouge, opticians rouge, emery, silicon carbide, diamond, etc., between them. This produces microscopic conchoidal fractures as the abrasive rolls about between the two surfaces and removes material from both., The other form of lapping involves a softer material such as pitch or a ceramic for the lap, which is charged with the abrasive. The lap is then used to cut a harder material—the workpiece. The abrasive embeds within the softer material, which holds it and permits it to score across and cut the harder material. Taken to a finer limit, this will produce a polished surface such as with a polishing cloth on an automobile, or a polishing cloth or polishing pitch upon glass or steel.