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The Computer Controlled Fatigue Testing Unit, "EEFC", designed by EDIBON, allows to study the fatigue strength of the materials. For that purpose, fatigue tests are performed with different materials and notches. Optionally, with the additional recommended element Set of Small Specimens, "EEF-SSP", it is possible to study the influence of different rounding radii and surface qualities on fatigue strength. The Computer Controlled Fatigue Testing Unit, "EEFC", is compatible with all available specimen sizes. An electric motor is fixed to the lower panel of the unit. One end of the test piece is joined to the motor shaft by a coupling. A disc which will count the number of rotations of the motor thanks to a device and a speed sensor for the motor are also coupled to the shaft. The speed can be controlled and changed through the computer. On the right side of the panel, it is placed the system with which the test piece is loaded. This system, with a load cell (force sensor), is joined to a threaded spindle by its upper end, while on its lower side it is joined to an articulated guided system to which the right end of the test piece is held. When turning the threaded spindle clockwi