One of these is the Poldi-hammer shown in the figure given above. The hammer type portable impact hardness tester is useful for simple and quick determination of Brinell hardness of metals such as steel, Cast Iron, Brass, Aluminium, Copper etc. Due to easy handling and maneuverability, this tester is most suitable for testing heavy castings and other components, difficult to be carried to a table type hardness tester.For testing, load is applied on the work piece (specimen) and a standard test bar in linear direction through a special Brinell Ball of 10 mm diameter by a hammer blow as explained below.The tester is supplied with calibrated bars of different hardness. For hardness measurement, selection of a calibrated bar is done such that its hardness is approximately equal to hardness expected of the work piece. For a given hardness of calibration bar, at the ratio of the two diameters youve measured, a value of hardness is given, the hardness of the work piece.
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