Lapping

lapping [′lap·iŋ]

(electronics)

Moving a quartz, semiconductor, or other crystal slab over a flat plate on which a liquid abrasive has been poured, to obtain a flat polished surface or to reduce the thickness a carefully controlled amount.

(metallurgy)

Polishing with a material such as cloth, lead, plastic, wood, iron, or copper having fine abrasive particles incorporated or rubbed into the surface.

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lapping

In reinforced concrete, the overlapping of steel reinforcing bars, or other reinforcement, so there is continuity of tensile stress in the reinforcement when the concrete member is subjected to a flexural or tensile load.

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Lapping 

a mechanical finishing operation for the fitting of workpieces, chiefly those with mating surfaces, for example, a valve with a valve seat. The operation consists in repeated relative movements of a tool (the lap) and the workpiece or of both the lap and workpieces together with an abrasive material. Lapping corrects the shape of workpieces within tolerance limits and reduces surface roughness.