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Sukahar
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PERANCANGAN KATROL PADA CRANE PORTABLE KAPASITAS 300 KG GUNA ALAT BANTU DI BENGKEL PERALATAN AKADEMI MILITER Juniarto Satryo; Sukahar; Suparyana
JURNAL MEKANIKASISTA Vol. 10 No. 1 (2022): NOVEMBER 2022
Publisher : PPM Sdirjianbang Akademi Militer

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Abstract

Military Academy equipment workshop one of the main tasks is to carry out the supply and maintenance of weapons, munitions and vehicle commodities to support the smooth running of education in the Military Academy environment. In the maintenance of vehicles often found a damaged vehicle engine so it needs to be repaired by lowering the vehicle engine. One of the tools needed is a crane. Crane is needed to move an item from one place to another. In the design of making this portable crane using steel rope type calculation according to United Rope Works Standard, Rotterdam Holland. Where the weight of the cargo lifted on this plan is 300 kg. Because the lifting is influenced by several factors, such as overload, dynamic conditions in operation and unexpected air changes, it is estimated that the additional load of 10% of the original load so that the weight of the cargo lifted to 330 kg. The maximum allowable stress value of steel rope is 362.946 kg, the permissible tensile stress is 59 kg/mm2, the cross-sectional area of steel rope is 0.088 cm2, the tensile stress that occurs on the rope is 41.24 kg / cm2. The calculation results are based on the selected type of steel rope according to United Rope Works Standard, Rotterdam Holland, which is 6 x 37 +1 fiber core. it is expected that planning steel rope is safe to use because the planned maximum tension (S) is smaller than the permit maximum tension ( S ) i.e. : 362.946 kg < 433.33 kg. And the planned tensile stress is smaller than the allowable tensile stress is : 41.24 kg/mm2< 59 kg/mm2.
PEMBUATAN ETHANOL GEL SEBAGAI BAHAN BAKAR ALTERNATIF PENGGANTI BAHAN BAKAR PADAT PARAFIN DI MEDAN LATIHAN Sukahar; Achmad Hafid; Suparja
JURNAL MEKANIKASISTA Vol. 10 No. 1 (2022): NOVEMBER 2022
Publisher : PPM Sdirjianbang Akademi Militer

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Bioethanol is a potential alternative fuel because the source is easily renewable. However, the use of bioethanol as a fuel substitute for kerosene is still rare. This is due to the plant that produces bioethanol is limited and constrained when the distribution is easy to spill. In addition, liquid bioethanol is more at risk of spilling and exploding easily because of its volatile nature to overcome these problems, liquid bioethanol is converted into gel bioethanol. This study aims to find the effect of water and carbopol on flash point, calorific value, and viscosity of bioethanol gel produced. The control variable in this study is bioethanol 90% (weight); stirring time is 1 hour and the variable is carbopol 0,85% ; 1,05% ; 1,25% (% weight and water 7,5% ; 7,9%; 8,3% (% weight).The Data in this study will be processed using the Surface Response method to obtain the results of the influence of each variable on the bioethanol produced and optimum operating conditions.From the research obtained, flash point is influenced by the percentage of water and the percentage of carbopol; calorific value is influenced by the percentage of water, the percentage of carbopol, and the interaction of both; viscosity is influenced by carbopol. Optimum flash point value of 21 0C and optimum calorific value of 4000 cal/g obtained under operating conditions the percentage of water is 7.9% and the total percentage of carbopol 1.09%.  
Co-Authors Achmad Hafid Juniarto Satryo Suparja Suparyana