<![CDATA[Result of cast pulley which better and high quality for mainly manufacture industry absolutely needed, so that the process of casting a nice, efficient, and economical to increase the yield and reduce the waste production. Casting is formed of a material by means of a metal melt and pour into the cavity desire with what we want. The purposes of the research were (1) to investigate the effect of the variation ingate the micro structure as the results of pulley aluminum casting bean using sand molds, (2) to investigate effect of the variation ingate toward the hardness of the results of pulley aluminum casting using sand molds, (3) to investigate the effect of the variation ingate toward the impact strength in the result of pulley aluminum casting using sand molds. This research used experimental method that contains one free variable (variable of the number of channel entering) and three factors of bond variables (micro structure, hardness and strength impact). The object of the research was the result of pulley casting from aluminum ingot Al-1,15%Si, and 2,01%Zn. The data analysis of this research is using descriptive data analysis, which is explaining the result of the research graphically on the table, histogram and micro structure. As the input parameter in data analysis, covers: variation ingate (1 ingate, 2 ingate, 3 ingate) micro structure, hardness, and the strength impact. Based on the research, it can be concluded that micro structure in the pulley aluminum casting with 1 ingate indicate metric Al-Si that has rare granular distance. Si that grouped form would be created large silicon granules phase. Micro structure in the pulley aluminum casting with 2 ingate indicates close Al-Si metric and the Si granule size is smooth. Micro structure in the pulley aluminum casting with 3 ingate shows close Al-Si metric and the size of the Si granules are smooth and spread evenly. The highest hardness result of pulley aluminum is on pulley with 3 ingate, it is 71, 6 VHN, then pulley aluminum with 2 ingate is 63,4 VHN, and the lowest result of the hardness is on the pulley aluminum with 1 ingate, it is 51,4 VHN. The highest result of the strength impact is on the pulley casting with 1 ingate, it is 0,077 J/mm2, then pulley with 2 ingate; it is 0,058 J/mm2, and the lowest result of the strength impact is on the pulley casting with 3 ingate, it is 0,054 J/mm2.]]>
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