Penelitian ini bertujuan untuk  mengetahui terjadinya misalignment pada komponen trasmisi putaran dan bagaimana cara melakukan alignment yang benar serta melakukan  pengujian  alignment, metode yang digunakan adalah  double dial indikator rim and face . Hasil penelitian pra- alignment yaitu melakukan pengecekan soft foot dengan menggunakan feeler gauge  dengan data rata – rata A  = 0.050 mm, B = 0.037 mm, C = 0.100 mm, D = 0.100 mm, E = 0.038 mm, F = 0.025 mm, G = 0.113 mm, H = 0.163mm, pengecekan run out  yang dilakukan di empat titik pada lingkaran kopling driver dengan penyetingan awal   dari pada arah jam 12 = 0, 9 = 0.006, 6 = 0.031 dan 3 = 0.085,  coupling offset vertikal  sebesar 0,016 mm. Pengecekan run out pada kopling driven dengan titik awal pada arah jam 12 = 0, 9 = 0.032, 6 = 0.107, 3 = 0.005, coupling offset vertikal  sebesar 0,054 mm. Setelah melakukan simulasi reposisi pada kopling driven pebaikan horizontal dan vertikal dengan perhitungan matematis rim and face maka untuk horizontal pillow block harus digeser ke kanan untuk IBdn = 1,040 mm , dan OBdn = 2,268 mm, Namun untuk posisi vertikal maka kaki mesin harus di tambahkan shims pada posisi IBdn =0,688 mm dan OBdn = 1,522 mm.

This gas cutting machine is an ST-37 metal cutting tool in a semi-automatic way using Liquified Potroleum Gas (LPG) and Oxygen gas materials. LPG gas is used with a composition of propane 80% and Isobutane 20%. In the process of cutting metal based on several parameters, namely: metal thickness, oxygen gas pressure, and LPG gas and cutting speed. Before cutting down the metal, the preparation stage is done by conditioning the test equipment and work equipment used to collect test data. The method used in this research is to select the type of metal and cutting equipment then do the recording and taking test data. Further analysis and examination are carried out as follows: visual inspection of the results of cutting and flame shape, a better composition results from testing in accordance with applicable rules such as pressure, plate thickness, and time of cutting. 80% and 20% LPG gas composition at gas working pressure: 0.2 kg / cm 2 , oxygen pressure: 2.5 kg / cm 2 , cutting distance of 2 mm. The results of this test are overall in good condition and no defects occur.

No abstract

This gas cutting machine is a ST-37 metal cutting tool in a semi-automatic way using LPG and Oxygen gas materials. LPG gas is used with a composition of propane 99,5% and Isobutan 5%. In the process of cutting metal must pay attention to several parameters, namely: metal thickness, oxygen gas pressure and LPG gas and cutting speed. Before cutting down the metal, the preparation stage is done by conditioning the test equipment and work equipment used to collect test data. The method used in this research is to select the type of metal and cutting equipment then do the recording and taking test data. Further analysis and examination are carried out as follows: visual inspection of the results of cutting and flame shape, a better composition results from testing in accordance with applicable rules such as pressure, plate thickness and time of cutting. 99,5% and 0,5% LPG gas composition at gas working pressure: 0.2 kg / cm2; oxygen pressure: 2.5 kg / cm2, cutting distance of 2mm. The results of this test are overall in good condition and no defects occur.

R290 is a type of natural refrigerant that has ODP = 0 and GWP = 4. While R32 from synthetic materials has ODP= 0 and GWP = 675 both are refrigerants used in Split AC. With this high GWP, it can have a damaging impact on the atmosphere. The advantage of R290 is that it has a lower density compared to R32, which can save the number of fillings in the AC unit by ±30% of the previous amount of refrigerant in the same volume. R290/R32 was flammable with LFL= 2%/13% and UFL= 10%/33%. The purpose of this study was to analyze the performance of R290 as a substitute for R32 on an AC-split unit with a capacity of 9,000 Btuh/hr. The steps used in the test are that the AC unit is placed in an open room with ambient temperature around 32°/80°C. The test was carried out until it reaches the optimal and stable temperature, then data is collected. The results of data collection from the evaporator air temperature R290/R32 = 21.4°C/23.0°C, condenser air temperature = R290/R32= 35°C/38.5°C, suction pressure= 90 psig/130 psig and discharge 200 psig/420 psig. The test data were analyzed and calculated using the Mollier Chart software with the results = R290/R32 = refrigeration effect = 344.8/272.2 kJ/kg, compression work = 12.18/13.02 kJ/kg, COP = 28.3/20.9, compression ratio = 2.2/3.2, strong electric current 4.98/5.73 A. From the decrease in electric current of R290 obtained a savings of 13.3% was obtained when converted to electricity bill payment and get a profit of 45,886/month.