Abstract
In this paper, it is reported that tapping resistances in the mechanical tapping using a tapping attachment were measured by a mechanical tool dynamometer constructed newly and connected to an oscillograph through an electric resistance strain gauge. The materials used were low carbon steel, cast iron, brass and aluminium. The diameters of the hand tapps were 3/16'', 1/4'', 5/16'', and 3/8'' Whitworth. As the result, the tapping resistance is not merely affected by the tapping speed but depends on the diameter of the tap drill and the form of the chamfer and the flute of the tap.
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