Question

magnitude of the pressures are recommended for soft materials in lapping is​

Answer 1

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A piece of lead may be used as the lap, charged with emery, and used to cut a piece of hardened steel. The small plate shown in the first picture is a hand lapping plate. That particular plate is made of cast iron. In use, a slurry of emery powder would be spread on the plate and the workpiece simply rubbed against the plate, usually in a "figure-eight" pattern.

Lapping is a machining process in which two surfaces are rubbed together with an abrasive between them, by hand movement or using a machine