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It is known that electricity appears when two bodies contact or cause friction. Although tribology is the science of lubrication, friction and wear, very little has been discussed about the electricity due to friction. One of the authors has studied generation of static electricity during oil filtration and its effects on oil oxidation. This study deals with generation of static electricity while a metallic ball slides on a lubricated metal. The experiment was conducted at various sliding velocities under the lubricated conditions by using a modified pin-on-disc machine. The static electricity, which was accumulated on the insulated pin and ball assembly, was measured. Within the range of the experiment, it was found that both the potential of the static electricity and the frequency of its discharges would increase in proportion to the sliding velocity.

Measurement of the Potential of Static Electricity Generated by the Friction of Oil Lubricated Metal on Metal