Abstract: A washing machine for nondestructively cleaning machine parts comprises an enclosure and a water wheel for projecting a wash liquid against an object to be treated. The water wheel rotates at high speed. Washing liquid is fed into a central opening in the water wheel, and the liquid is projected at high velocity against the object to be cleaned. The liquid is projected in a pattern comprising a plurality of spaced-apart, geometrically similar, arcuate, dense zones of wash liquid. A pulsed cleaning effect is obtained. The device is especially useful for cleaning worn automotive and truck brake shoes prior to reconditioning the brake shoes.

Abstract: In order to make casting sand or another moldable mixture, a pressure surge wave is used which has upper and lower limit values which values have been established by an optimal selection of a pattern of pressures. The other moldable mixture comprises particles of raw material, binder, water, and, if need be, additives. The rise in pressure takes place with an increasing pressure gradient, dp/dt, of at least 50 atmospheres (absolute)/second. A minimum pressure of at least 2 atmospheres (absolute) is maintained for at least 0.01 second. The pressure drop takes place at a decreasing pressure gradient,--dp/dt, of up to about 2.0 atmospheres (absolute)/second. The disclosed values represent an optimalization, in view of a simple design and economy of operation, with a surprisingly good compacting.