Lean manufacturing is about eliminating waste including the seven traditional, this writing suggested an observation on no value added of seven wastes influencing the process of fresh water production. The relationship value among waste was statistically verified to create an approach for continuous improvement action. Thus, the main goal of this research is to develop a methodology of relationship among wastes and eliminate them. In relationship among wastes, it could be known that the high value indicating how often it happened in the production process gave direct cause in the system of fresh water treatment. A recommendation to reduce the highest value of waste is by doing improvement on parameter setting to obtain an optimum mixing model between water supply, alum and stroke pump with Taguchi method. The interaction of relationship among these seven types of waste can be portrayed using fishbone diagram and a relationship model among wastes using PLS smart (partial least squares). The final relationship model with the highest value of waste was analyzed using off-line quality control to upgrade the quality of fresh water used as the basis to eliminate waste and find out the optimal parameter of mixing process in accordance with the health standard.

Purpose: To analyse the strength of materials by means of optimization, find the best value of the strength test of mutually influential materials with a variation of roll-hoop height. Design/methodology/approach: The research began with the design of a threedimensional model by varying the height of the roll-hoop on chassis types: A, B, C, D, E, F, G, H ,and I. The height of the main roll hoop at each chassis is: 502, 504, 506 508, 510, 512, 514, 516 and 518 mm. Then by using the student version of Autodesk Inventor, a simulation is made to test: Deflection, Normal stress, Shear stress (T-x / T-y) and Torsional stress. The results of this test are used to analyse the types of chassis that have been designed so that the best chassis design is obtained. Findings: The results obtained in this study are the value of Normal stress decreases with increasing roll-hoop height, and applies inversely to the torsional stress value. Deflection values tend to be stable with increasing roll-hoop height, while Shear stress T-x and T-y values tend to fluctuate. Research limitations/implications: The chassis material uses carbon steel which has mechanical property values in accordance with 2015 FSAE Standard regulations. Practical implications: The optimization results of the design of the roll hoop height on the chassis show that the chassis type B with the main roll hoop height of 504 mm is the best with the lowest deflection value and the difference in tension according to the FSAE rules. Originality/value: The research that has been done only tests the strength of the ingredients separately. In this study trying to analyse the strength of the material by way of optimization to find the best value from the strength test of material that influence each other with a variation of roll-hoop height.

Penelitian ini bertujuan untuk bagaimana merancang dan membuat alat pemotong kerupuk otomatis dengan kapasitas yang ditentukan. Untuk perencanaan alat ini dimulai dari perhitungan perencanaan perhitungan daya motor listrik, sistem transmisi, menghitung sabuk V, Pulley, Sprocketchain , pasak, poros, bantalan dan analisis kekuatan rangka. Berdasarkan perhitungan alat yang didapat adalah: alat ini menggunakan motor listrik ¼ HP 186 (watt) denagn putaran elektro motor 2870 rpm, sistem transmisi  menggunakan sabuk V dengan tipe B dengan panjang sabuk (L) 1930 mm atau 76 inchi. dengan ukuran puli kecil 3 inchi 73,9 mm dan diameter puli besar 30 inchi 785,52 mm. untuk jumlah gigi sprocket kecil 16 D1 97,64 mm dan gigi sprocket besar 32 D2 195,38 mm, diameter poros 14,10 mm, dengan tinggi pasak 6 mm dan panjang pasak 17 mm. Analisis kekuatan rangka dengan 15 titik beban, setiap titik memiliki beban 1 kg dan ada 17 titik tumpuan dengan hasil yang didapat rata – rata 0.000 – 0.870 N, besi tipe L steel alloy beban maksimalnya 2.183.902 N.mm. Kapasitas produksi yang dihasilkan alat ini 60 kg/jam. This study aims to design and make automatic cracker cutting tools with a specified capacity. For planning this tool starts from the calculation of electric motor power planning calculations, transmission systems, calculating the V belt, Pulley, Sprocketchain, pegs, shafts, bearings and frame strength analysis. Based on the calculation tools obtained are: this tool uses an electric motor ¼ 186 HP (watts) with 2870 rpm electro motor rotation, the transmission system uses a V belt with type B with a belt length (L) 1930 mm or 76 inches. with a small pulley size of 3 inches 73.9 mm and a large pulley diameter of 30 inches 785.52 mm. for the number of small sprocket teeth 16 D1 97.64 mm and large sprocket teeth 32 D2 195.38 mm, shaft diameter 14.10 mm, with 6 mm peg height and 17 mm peg length. Analysis of frame strength with 15 load points, each point has a load of 1 kg and there are 17 support points with the results obtained on average 0.000 - 0.870 N, iron type L steel alloy maximum load of 2,183,902 N.mm. The production capacity produced by this tool is 60 kg / hour.

Abstrak Penelitiani inii bertujuani Meningkatkani Produktivitasi Pembubutani Menggunakani Metodei iTaguchi. Dalami perusahaani industrii lamai pengerjaani darii suatui produki sangati mempengaruhii ongkosi kerjai dani tingkati produktivitasi ipemesinan, sehinggai idiperlukani suatui imetode iagar idapat imengoptimalkan itingkat iproduktivitas. Metodei Taguchii dapati digunakani untuki melakukani optimasii untuki mendapatkani tingkati produktivitasi pemesinani iterbaik. Penelitiani inii menggunakani materiali bajai STi 42 dengani prosesi pemesinani bubuti ikonvensional. Dapati diketahuii dalami ipenelitian inii untuki mendapatkani kekasarani yangi palingi ibaik ataui optimumi parameteri pembubutani yangi digunakani yaitui padai putarani ispindel 490 rpm, geraki imakan 0.11 imm/put, kedalamani imakan 0.2 imm. faktori iyang ipaling iberpengaruh idalam ipenelitiani inii iadalah putarani spindeli 41.6%, geraki imakan 46.3 % sedangkani kedalamani makani kurangi berpengaruhi yaitui isebesar 5.4%. AbstractThis study aims to increase the Productivity of Rolling Using Taguchi Method. In the old industrial company the work of a product greatly affects the work cost and the level of machinary productivity, so it needs a method in order to optimize the level of productivity. The Taguchi method can be used to optimize to get the best machining productivity level. This research uses ST 42 steel material with conventional lathe machining process. It is known in this study to obtain the best roughness or optimum parameters used in the spindle rotation is 490 rpm, feeding motion 0.11 mm/rev, 0.2 mm feeding depth. the most influential factor in this research is spindle rotation 41.6%, feeding 46.3% while the eating depth is less influential that is equal to 5.4%.

Penelitian ini bertujuan untuk mengetahui pengaruh variasi aliran gas pelindung dan bentuk kampuh terhadap kekerasan dan struktur mikro baja ASTM A36. Variasi aliran gas pelindung yang digunakan adalah 5 liter/menit, 10 liter/menit dan 15 liter/menit, sedangkan bentuk kampuh yang digunakan adalah kampuh I, ½ V dan V dengan elektroda ER 70S-6 diameter 1,2 mm. Hasil penelitian menunjukkan bahwa aliran gas pelindung yang semakin besar akan meningkatkan nilai kekerasan. Peningkatan nilai kekerasan weld metal dan HAZ tertinggi ada pada kampuh V dengan aliran gas 15 liter/menit sebanyak 38,06% weld metal, 11,15% HAZ, sedangkan nilai kekerasan terendah weld metal terdapat pada aliran gas 5 liter/menit pada kampuh ½ V yaitu 41,9 HRB dan nilai kekerasan HAZ terendah terdapat pada aliran gas 5 liter/menit pada kampuh I yaitu 40,8 HRB. Peningkatan nilai kekerasan base metal tertinggi ada pada kampuh ½ V sebanyak 39,46%  dengan aliran gas 15 liter/menit sedangkan kekerasan base metal terendah pada kampuh I yaitu 43,4 HRB dengan aliran gas 5 liter/menit. Hasil pengujian struktur menunjukkan semakin tinggi aliran gas pelindung akan meningkatkan pembentukkan pearlite lebih banyak. Persentase pembentukan pearlite paling banyak ada pada weld metal kampuh V yaitu 53,16% dan persentase pearlite paling sedikit daerah HAZ kampuh I yaitu 38,17%.