Abstract
The present paper describes a simple four balls testing device adapted for a classical drilling machine, using standard methodology meant to evaluate the lubricating properties of lubricants. The advantage of the method consists in the possibility of using any type of balls and a special device adapted to a common drilling machine. The evaluation of anti-wear lubricants properties can be done by comparing the contact scar dimension obtained experimentally, following the procedure described in EN ISO 20623:2003 international standard. The contact scar diameter is measured using an optic microscope equipped with a camera and specialized software, by comparing the scar with a known body dimension. Some experimental results obtained for the contact between four 12.7 mm bearing balls lubricated with grease are presented as well. The contact scar dimension-load dependencies are similar to those presented in literature and therefore validate the experimental setup.
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