Lapping


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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.

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.

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.
References in periodicals archive ?
To lap or polish away taper, bow, and size variation, it's necessary to control lapping pressure accurately.
Today's double-side lapping machines achieve consistent results by providing programmed soft-touch approach and pressure application.
A continuous flow of abrasive slurry evenly applied to the top and bottom lap surfaces and uniformly distributed over the complete lapping area results in accuracy in size, flatness, surface finish, and uniform production.
Machines for cylindrical lapping employ two annular laps, each mounted on a vertical spindle (Figure 9).
Controlled lapping occurs as the parts slip and slide during rolling, caused by the nonradial direction of the workholder slots (Figure 8).
The starting lapping pressure is applied to the larger parts until all parts are of equal size and straightness.