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In the experimental work described in this report various bronze alloy bushes made by different methods were tested at slow speed and high pressure, for periods of up to 550 minutes. The properties of bushes made by a novel centrifugal casting technique which involved the incorporation of a bonded sand inner mould in a rotating die block were compared with bushes (a) cast in static sand moulds, and (b) commercially made to British Standard from continuously cast bar stock. Various tests were completed and these included a comparison of coefficients of friction, weight loss and bearing running temperature for leaded gunmetal, leaded bronze, phosphor bronze and aluminium bronze. In the tribology tests the bushes made from aluminium bronze proved to be slightly better than the phosphor bronze ones and the experimental centrifugally cast bushes compared favourably with those made commercially by static castings.

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