The gears are an important part of a mechanism. Making gears requires high precision to avoid backlash. The machining process that can produce high precision is the process of Wire cut EDM. This study aims to determine the roughness of the workpiece surface and investigate the effect of current and wire speed on the roughness of the straight gear surface through wire cut machine EMS 45. The wire cut machining parameters used are 3, 5, and 7 amperes for current, and wire speed of 8, 10, and 12 mm/min. While the Wire material is a type of brass with 0.25 mm in diameter. The results presented that the increased use of current and wire speed will result in lower surface roughness, and vice versa. Therefore, it can be concluded that use low machine parameters to produce a smooth workpiece surface.

The laboratory role is huge in determining the quality of education because the laboratory produces proud scientific works, which other institutions cannot make. To get quality universities, laboratories are a priority. The laboratory is an integral part of the academic field. Laboratory management needs to be aligned with educational planning (programs and budgets). This research was carried out at the Ujung Pandang State Polytechnic (PNUP) and the Merchant Marine Polytechnic (PIP) Makassar. This research method is a comparative research type. Data collection techniques used are observation, interviews, and documentation. The method of analysis was using quantitative descriptive analysis. The results show that the Ujung Pandang State Polytechnic has a laboratory with laboratory management that is very concerned about the curriculum/module/syllabus, which is updated regularly. Comparing management laboratory includes a) understanding and access freely the modules for students, b) online laboratory schedule, c) the ratio of teachers according to the Higher Education standard of 1 : 8. For Laboratory Management at the Ujung Pandang State Polytechnic using the SOP for practicum implementation managed by a laboratory technician who has a certificate for the use of laboratory equipment. Some technicians are always available at the laboratory. The ideal laboratory to consider the ratio between the area of the laboratory room and the number of practitioners, the balance between teachers and students, the proportion of equipment, facilities, room conditions, and the equipment used condition.

Voltage instability in a synchronous generator can lead to system instability, affecting the quality and ability to transfer power to consumers. The worst-case scenario is load- shedding. To prevent this, the Automatic Voltage Regulator (AVR) is used to control the voltage stability of the synchronous generator. However, the AVR is often damaged, which prompted us to investigate its role in stabilizing the output voltage of the synchronous generator. This study was conducted on the Sultan Hasanuddin Training Ship owned by the Marine Science Polytechnic (PIP) Makassar using experimental research methods. Data collection techniques included observation, measurement, and documentation, and quantitative descriptive methods were used for analysis. Results indicated that the role of the AVR on the Sultan Hasanuddin Training Ship was insignificant since changes in generator load did not result in high fluctuations. The excitation current on the voltage amplifier or the output voltage of the synchronous generator remained within the working limit. This was proven by the generator's rotation speed, which ranged from 1470 to 1500 rpm, and a generator load of 36 to 38 kW.

Steel possesses mechanical properties that can enhance the hardness and microstructure of its surface, and heat treatment is one way to achieve these properties. This study aimed to investigate the impact of different cooling media on the heat treatment process and the resulting impact strength of S45C medium carbon steel. The steel specimens were heated at various temperatures (800oC, 850oC, and 900oC) in a furnace and then cooled using three different media: water, oil, and air. The study concluded that for all three temperatures, the specimens cooled with oil had the highest impact value. Furthermore, oil and air immersion resulted in ductile fractures, while water immersion caused brittle fractures.

This paper aims to optimize the machinedsurface as well as to study the effect of current strength andwire speed on wire cut machining on AISI 1045 steel againstthe timing of roughness of straight gear surface. The surfaceresults analyzed are the surface roughness values obtained byconducting surface roughness testing. Variations of currentused are 3 amperes, 5 amperes, and 7 amperes, while the wirespeed used is 8mm / min, 10 mm, min, and 12 mm / min. In theprocess of wire cut machining is used a brass cutting materialwith 0.25 mm wire diameter. The results showed that thegreater the current and wire speed used then the surfaceroughness value will be lower, otherwise the smaller currentand wire speed used then the surface roughness value will behigher. The results of data analysis using ANOVA analysis,correlation, and regression method obtained optimal conditionto get low surface roughness value and fast cut time that is at 7amperes current with wire speed 8 mm / min.