Singkong merupakan salah satu hasil perkebunan Indonesia yang banyak dimanfaatkan oleh masyarakat. Salah satu hasil pengolahan singkong adalah keripik singkong. Produsen pengolahan keripik singkong mulai dari produsen skala besar (pabrik), industri rumah tangga, atau kelompok masyarakat kecil (desa). Pada saat ini kebanyakan produsen keripik singkong skala menengah dan kecil masih menggunakan proses pemotongan atau perajangan singkong secara manual. Proses perajangan manual tersebut menyebabkan waktu produksi yang lama. Pembuatan mesin perajang singkong merupakan salah satu alternatif untuk menambah efisiensi dan produktivitas pengolahan keripik singkong. Oleh karena itu, desain mesin perajang singkong dibuat guna mengatasi masalah produksi yang lama pada produsen keripik singkong skala menengah dan kecil. Desain perajang singkong ini menggunakan cakram 4 mata pisau pemotong dan tenaga penggerak motor listrik. Selanjutnya, merencanakan dan menghitung gaya pada komponen elemen mesin, besar daya motor yang digunakan, serta kapasitas yang dihasilkan oleh mesin perajang singkong. Hasil dari perencanaan dan perhitungan, didapatkan mesin perajang dengan menggunakan daya 1 Hp, putaran 180 rpm dengan satu cakram putar menghasilkan kapasitas 64,8 kg/jam.

Wet noodles are one of the foods that are favored by all people, especially in Indonesia. Wet noodles are made from basic ingredients of wheat flour or wheat flour. So far there have been many innovations of wet noodles with basic ingredients apart from wheat flour. The difference in the basic ingredients and additional ingredients can affect the quality of the noodles. However, it is not yet known whether the effect of the quality of the wet noodles is influenced by the type of flour used, the amount of the basic ingredients, or whether there is an effect of the extracts of other ingredients on the quality of the wet noodles. This is the reason for this research. Thus, this study aims to determine the types and differences in the use of basic ingredients in making wet noodles that can affect the quality of wet noodles. Measurement parameters used are by calculating the level of water absorption. The combination of wheat flour, cassava flour, and seaweed were used in this study. Calculation analysis is performed using the Taguchi method. The Taguchi method is the methodology in the world of Engineering which can be used as a method to measure or improve the quality of a product, as well as minimize costs. Wet noodle making experiments were conducted according to the Taguchi Design of Experiments (DOE) method. The repetition of the experiment was carried out eight times according to the orthogonal array (OA) matrix used. There are 5 control factors and 3 noise factors that are used in this study. Control factors are wheat flour, cassava flour, eggs, salt, and seaweed. Meanwhile, the noise factor is a lot of water, a long time to rest dough, and a long time to steam. ANOVA analysis and mean effect were carried out to find out which factors had the most significant influence on the quality of the noodles.

Pemanfaatan limbah digunakan pada berbagai sektor seperti bidang industri, makanan, manufaktur, dll. Limbah organik terdiri dari sisa makanan, sayuran, atau bahan sisa proses pengolahan tanaman. Limbah organik dimanfaatkan sebagai pupuk organik dan juga pakan ternak. Tujuan dari penelitian ini adalah membuat prototype mesin pencacah limbah organik untuk mencacah limbah agar dapat diolah menjadi pupuk kompos dan pakan ternak. Komponen penggerak utama pada prototype mesin pencacah limbah organik adalah motor listrik dengan daya 1/2 HP dan 2880 rpm, reducer dengan rasio putaran 1/20, perbandingan pulley 3/4 dengan belt yang digunakan A-66. Perhitungan yang dilakukan pada proses perancangan prototype mesin pencacah limbah organik adalah perencanaan v-belt dan pulley, perhitungan laju dan torsi pada poros pisau. Kapasitas hasil cacahan dibedakan dengan 2 jenis pengujian yaitu dengan reducer dan tanpa reducer. Jenis limbah yang dicacah adalah limbah sayur, limbah kulit organik, dan ubi-ubian. Hasil kapasitas cacahan dengan reducer mencacah limbah sayur dengan kapasitas sebanyak 16.5 kg/jam, untuk limbah kulit organik 8.7 kg/jam, dan untuk limbah ubi-ubian sebanyak 26.13. Untuk prototype mesin pencacah tanpa reducer memiliki kapasitas cacahan untuk limbah sayur sebanyak 111.84 kg/jam, dan kapasitas untuk limbah jenis kulit organik sebanyak 93.72 kg, sedangkan untuk limbah ubi-ubian tidak dapat dicacah oleh prototype tanpa reducer.

The technology in modern era and rapid construction sector has made welding an important role in the field of metal engineering and repair. Therefore, the technology in the construction sector, especially in the engineering sector, requires a welding element. Welding is used to combine with metal. Making this connection requires high skill for welder in order to obtain a good quality connection. The aim of this study was to determine the quality of a good welding result using the design of experiment method by looking at the control factor of the electrode, welding amperage, welding method, plate thickness, and welding speed. In addition to control factors, there are also use noise factors such as skill, cleanliness of work pieces, and distance between work pieces. The results of the experiments are based on weld defect criteria and the DOE method with ANOVA calculations, the best welding results are in trial no 7 with an average value of 0.22. Meanwhile, the results of the experiment with welding defects is trial experiment no 2 with a value of 0.64. The factors that influence the quality of the welds are plate thickness, welding amperage, electrodes, and welding method. Meanwhile, the welding speed factor is a factor that does not significantly affect the weld quality.

Recycling plastic waste can help reduce plastic waste, which is the world’s largest problem. The first solution is a plastic crusher machine, which converts plastic packaging into pellets, especially for plastics made from polyester, which is often used in bottle packaging. An integral part of the crushing machine is the crushing blade, which determines the design and analysis of the blade. The finite element analysis method is widely used in engineering analysis. Its results can provide useful information for the analysis of manufacturing processes. A rectangular blade and a star-shaped blade are the two types to consider. The analytical results obtained on the blade of the crusher machine in the rectangular shape that was given loads by 200 N, 400 N, and 600 N are 1.285 × 103 N/m2, 2.570 × 103 N/m2, and 3.855 × 103 N/m2, respectively. We obtained the displacements are 1.080 × 10-6 mm, 2.160 × 10-6 mm, and 3.241 × 10-6 mm, respectively. The maximum von mises stress result on consecutive star-shaped blades are 8.890 × 102 N/m2, 1.778 × 103 N/m2, and 2.667 × 103 N/m2. The displacement obtained are 1.211 × 10-6 mm, 2.422 × 10-6 mm, and 3.633 × 10-6 mm. The results of this analysis indicate that for the star blade, the shape is better than for the rectangular blade at the same time, and for the star blade, the stress is smaller than for the rectangular blade. Based on this simulation, the safety factor is 15, which means that it is more than 1, which means that it is safe.