E Even a very small deviation occurring in the machine tool influences stronglyto the product quality. Therefore, for a certain period, the machine tool need to be re­ calibrated in order to know its deviation. The testi g's accun ':Y of geometrical milling machine is aim to know whether the milling machine type FU 251 in Production process laboratory's Faculty of Industrial Technical of Trisakti University (FTI USAKTI) still fulfill deviation standard which have been determined.The standard that used in this testing's accuracy on the milling machine deviation is SNI 05-1620-1989. This standard is the standard which is used as procedure in the testing's accuracy of geometrical milling machine with the vertical spindle and adjustable table . This testing methode is conducted through the Geometrical Static.The testing 's accuracy of geometrical milling machine consist of G1a, G1b,G2a, G2b, G5a, G5b, G6a, G6c, Gll, 013, G14a and Gl4b. The resu lts of the testingfulfill the deviation standard that have been determined in SNI 05-1620-1989, except the G5b, G11 and G 13 which not fulfill with the deviation standard. This is due to the limitation of the measuring equipment at Metrology Industry of FTI USAKTI.