The reduction of water content to a certain extent for cereals in the form of grain can be done through several methods, one of which is drying with heating. The purpose of this research is to design a prototype drying machine with a vertically screw-shaped mechanical screw. The drying machine is designed using heater and mixer working principles, wherein the heater is used for the drying process by engineering the heating air, while the mixer is used for the stirring system on the material to be dried. Tool design includes: Screw, Casing wire, Casing House and chassis. The wire casing design is based on the incoming heat flow rate and exhaust heat flow rate with the parameters of air velocity of entry and exit air velocity is known. The result of air velocity is 0.25 m2/s and the air velocity is 0.42 m2/s. Thus, the incoming heat flow rate is 0.5 kg/m3, and the outflow heat rate is 0.52 kg/m3. The volume of the contents of the wire casing of 7,5 kg/cm3. Screw designed with length (p) 60 cm, width of the upper arm (la) 28.8 cm, width of the forearm (lb) 22 cm. Wire casing is designed with length (p) 100 cm, width of upper arm (la) 50 cm, width of forearm (lb) 30 cm. The casing is designed with length (p) 100 cm, width of the upper arm (la) 70 cm, width of the forearm (lb) 50 cm, The chassis is designed with length (p) 107 cm, width of the upper arm (la) 77 cm and arm width Bottom (lb) 77 cm. And supported aids in the form of: Electric motor that serves as a driving force in the stirring system with a capacity of 450 rpm motor rotation is reduced with the transmission belt puly. Based on the results of the design has been successfully made prototype vertical dryer machine with mechanical stirring for grain.

Abstract West Aceh is one of the regions in Aceh Province that has natural resources in the form of coal mines and biomass in the form of rice husks, sawdust, peanut shells and coconut shells which have not been utilized. One of the efforts to exploit this potential is by processing it into bioarang coal briquettes into alternative fuels through the briquette process. The purpose of this study was to determine the level of brittleness in the manufacture of coal and biomass briquettes. The research was conducted by varying the mass composition of the mass weight of the mixture between coal and sawdust biomass, rice husks, coconut shell and peanut shells by 50%, 60%, 70% for coal and 40%, 30%, and 20% for biomass. The adhesive (glue) in the form of starch is 10%. Pressure applied is 80 lb/in2, 100 lb/in2 and 120 lb/in2. The test used the drop test method with the calculation procedure using the ASTM D 440-86 r02 standard. The results showed that the ratio of the composition of the mixture of raw materials and pressing pressure had an effect on the brittleness of the briquettes. The highest brittleness was obtained at a composition ratio of 50% coal: 40% coconut shell: 10% starch at a pressure of 80 lb/in2 obtained a weight of 24, 24 grams. The lowest brittleness is obtained at a mixture composition of 60% coal: 30% peanut shell: 10% starch at a pressure of 80 lb/in2, the weight is 29.7 grams. Keyword Coal, biomass, starch, hydraulic pressure. __________________________ Abstrak: Aceh Barat merupakan salah satu wilayah di Provinsi Aceh yang memiliki sumber daya alam berupa tambang batu bara serta biomassa berupa sekam padi, serbuk kayu, kulit kacang tanah serta tempurung kelapa yang belum termanfaatkan. Salah satu upaya untuk memanfaatkan potensi tersebut adalah dengan cara diolah menjadi briket bioarang batu bara menjadi bahan bakar alternatif melalui proses pembriketan. Tujuan dari penelitian untuk mengetahui tingkat kerapuhan pada pembuatan briket campuran batubara dan biomasa. Penelitian dilakukan dengan memvariasikan komposisi berat masa campuran antara batu bara dan biomasa serbuk kayu, sekam padi, tempurung kelapa dan kulit kacang tanah sebesar 50%, 60%, 70% untuk batubara dan 40%, 30%, dan 20% untuk biomasa. Bahan perekat (lem) berupa tepung kanji sebesar 10%. Tekanan diberikan sebesar 80 lb/in2, 100 lb/in2 dan 120 lb/in2. Pengujian menggunakan metode drop test dengan prosedur perhitungan menggunakan standar ASTM D 440-86 r02. Dari hasil penelitian menunjukkan bahwa perbandingan komposisi campuran bahan baku dan tekanan pengepresan berpengaruh terhadap tingkat kerapuhan briket. Kerapuhan tertinggi diperoleh pada perbandingan komposisi sebesar 50% batu bara: 40% tempurung kelapa: 10% tepung kanji pada tekanan 80 lb/in2 diperoleh berat 24, 24gram. Kerapuhan terendah diperoleh pada perbandingan komposisi campuran 60% batu bara: 30% kulit kacang tanah:10% tepung kanji pada tekanan 80 lb/in2 diperoleh berat 29, 7gram. Kata kunci Batu bara, biomassa, tepung kanji, tekanan hidraulik __________________________

Plastic is a material that is widely used in daily life, because it has advantages such asstrong,  lightweight  and  stable. But  the  plastic  on  the market  today  are  synthetic polymers made from petroleum are difficult to decompose in nature. Judging from the nature of the plastic constituent is composed of components of petroleum hydrocarbons, the plastic waste has the potential to be converted into fuel. The technique used to restore the plastic material is by breaking the carbon chains or polymers that become hydrocarbons. The purpose of the design tool processing waste plastics into fuel oil- fired biomass is to design a waste treatment plant in the plastic to produce oil (fuel), making the design drawings of the equipment is planned, determine the materials to be used,  make  and  assemble  the apparatus  according  to  the  design  the planned. In pyrolysis occurs tool decomposition process of organic compounds on the materials. This decomposition caused by the heating process without dealing directly with the air with little oxygen. Waste processing equipment plastic that will be planned to include the design of the combustion chamber, reactor design, pipeline design fence steam, design connecting pipe between the reactor and the pipe fence steam. Extensive volume of reactor tubes obtained then has acquired equipment capacity 4 kg / production.

Baja tahan karat AISI 304 secara umum digunakan pada mesin-mesin konstruksi terapan sederhana seperti poros propeler kapal nelayan, mesin penghancur es, pemeras tebu danlainnya, dikarenakan ketahanan korosifnya yang baik, disisi lain kelemahan AISI 304 pada kondisi lapangan sering mengalami deformasi dan kepatahan dengan putaran yangrelatif  tinggi. Untuk mengatasi hal tersebut dapat dilakukan  usaha  menambah  nilai kekerasan permukaan dengan melakukan pengujian Jominy Hardenability. Pengujian Jominy yang dilakukan pada spesimen uji dengan standar ASTM A255-02, dengan laju air pada nozzle 45 liter/menit, pada temperature 8500C dan holding time 15-20 menit. Hasil pengujian menunjukkan bahwa nilai awal kekerasan permukaan pada ujung quenching  sisi A adalah 187  HB dan pada  sisi B adalah  170 HB. Nilai kekerasan permukaan setelah di normalizing pada ujung quenching sisi A adalah 182 HB dan pada sisi B adalah 188 HB. Maka terjadi penurunan kekerasan pada sisi A sebesar 5 HB, dan terjadi peningkatan kekerasan pada sisi B sebesar 18 HB. Setelah di uji Jominy nilai kekerasan pada sisi A adalah 227 HB, dan pada sisi B adalah 223 HB. Pada pengujian jominy terjadi peningkatan kekerasan pada ujung sisi A sebesar 45 HB, dan peningkatan kekerasan  pada  sisi B sebesar 35  HB. Hasil penelitian  ini dapat direkomendasikan bahwa AISI 304 sebelum digunakan sebaiknya dilakukan pengerasan permukaan sehingga sifat mekanik bahan menjadi lebih optimal.