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In several fields like aeronautics, die and automotive, the machining of theparts is done more and more on high speed machines tools. Today, the offer forpurchasing these machine tools is very wide. This situation poses the problemof the judicious and objective choice meeting industrial needs that must benecessary well expressed. The choice remains difficult insofar as the technicaldata provided to the customers by the manufacturers of machine tools areinsufficient as well quantitatively as qualitatively. In this paper we presenta protocol for the characterization of machines tools in order to direct thechoice. The protocol is based on the one hand on no-load complementary tests tothose recommended by the standards ISO 230 and ISO 10791 and on the other handon the tests in load on a part test. In the first part, we present theindustrial needs as well as an analysis of the technical data of machine tools.The second part is devoted to the study of the standards, the description ofthe protocol and the presentation of the results.

D\'efinition d'une pi\`ece test pour la caract\'erisation d'une machine UGV