The beam is an important component in agantry machining center, and its deformation is believed to haveasignificant impact on both the machining accuracyandthe machining performance. In this research, the finite elementmodels of a complete gantry machining center and the crossbeam are established, in whichthe restraint and boundaryconditions for the finite element analysis are also introduced. It is noted thatthe impact of balance cylinders on the keycomponents is fully considered when dealing with the force analysis. Computed results of the static characteristic analysisshowed that the maximum deformation is about 0.080925 mm when crossbeam operates under different conditions. Then,the distortion curve and the compensation curve of guide rail are obtained, and the equation of a fitting compensationcurveis also deduced through numerical analysis. This research is expected to provide a theoretical guide for distortioncompensationof the crossbeam.
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