Experimental tests are necessary in order to understand the behaviour of the lubricated contact between the cam and the follower. Some experimental works were made in the past. A study for the realization of a new experimental rig started at the University of Pisa. The new rig is basically able to measure two fundamental quantities of the lubricated contacts: the film thickness and contact force. Due to the continuous movement of the cam-follower contact point, particular problems are related to the contact force measurement and to the interference images detection. A measurement group has been specifically designed able to measure all components of the contact force. The film thickness and shape is estimated by interferometric method using a microscope that can be connected to a high-speed camera; the whole system is moved with specific laws by a computer controlled XYZ positioner. The main problems faced for the preliminary set-up of these two fundamental groups are described in this work.
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