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Aluminum and their alloys have been applied in many industrial sectors. Although it shows a good corrosion properties, however welding process of aluminum still a challenge as it covered by oxide layer on the surface. Friction Stir Welding (FSW) technology gives a potential chance to be used for joining process of aluminum. In this study, we use a vertical milling machine Milko-12 that has been utilized with indentor of FSW process for Aluminum 1100-H18 at 4 (four) different rotation speed (Rt), i.e.: 352, 490, 653, and 910 rpm and constant transversal speed (V) 20mm/minutes. Based on mechanical properties and metallography data of welded materials, the higher the Rt the higher the tensile strength. Rt of 653 rpm results the highest tensile strength of 107 MPa. The crack areas of all welded metals are at base metal (BM) concluded that our vertical milling machine Milko-12 can be utilized for friction stir welding (FSW) process for Aluminum.