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ABSTRACT
In this project, a metal polishing machine, an advantageous apparatus in the testing and property investigation of metals, is designed and fabricated. The essence is to produce a simple and affordable piece of apparatus that can be used in research centres, laboratories, and workshops of Nigerian higher institutions and can serve as an alternative to the imported and costly polishing machines currently in use. The design uses motor-powered grinding wheels of appropriate composition to be rotated against a marked-out area of a sample metal piece to be polished and subsequently etched for metallographic purposes. A considerably chemically inactive liquid does the etching in Nita solution comprising nitric acid and ethanol. Mainly dependent on the type of metal being polished, water is used for flushing the polished area to ensure a smooth polished surface that retains the original microstructural composition and arrangement inherent in the original sample as it where before polishing. The polishing wheels are fine-grained and dense structured abrasive materials bonded together with an appropriate bonding agent.
