Angga Sateria
Politeknik Manufaktur Negeri Bangka Belitung

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EVALUASI KINERJA SPINDLE MESIN GERINDA DATAR TIPE REFORM PSGS-4070 AH MELALUI ANALISIS GETARAN DI BENGKEL POLMAN BABEL Syahid Al Akhras; Indra Feriadi; Angga Sateria
Prosiding Seminar Nasional Inovasi Teknologi Terapan Vol. 6 No. 1 (2026): Prosiding Seminar Nasional Inovasi Teknologi Terapan
Publisher : Politeknik Manufaktur Negeri Bangka Belitung

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Abstract

Surface grinding constitutes a vital machining process for producing components with high geometric surface quality, with spindle condition serving as the principal factor governing the final machining outcome. This study sets out to evaluate the performance of the spindle on a Reform PSGS-4070 AH surface grinding machine through vibration analysis, while also examining its relationship with surface roughness. An experimental approach was adopted by varying the depth of cut across five levels, with vibration recorded in the horizontal and vertical directions using a Vibroport 80, and surface roughness assessed using a Mitutoyo SJ-210 Surface Roughness Tester. The findings reveal that horizontal vibration rose sharply as the depth of cut increased, moving from Zone A (good) to Zone B (requiring attention) under ISO 10816-3, whereas vertical vibration stayed comparatively steady within Zone A throughout the trials. The resulting spectral pattern points to unbalance in the rotating element along with an early sign of disturbance in the bearing. Horizontal vibration showed a closer relationship with surface roughness than vertical vibration, whose relationship was weaker and less consistent. The safest machining condition was attained at a low depth of cut (≤0.050 mm), yielding the lowest vibration level together with consistently good surface quality.
PENERAPAN CORRECTIVE MAINTENANCE PADA MESIN PRESS KELAPA SAWIT DI PT GSBL DENGAN METODE 5 WHY Steven Leonardo; Yudi Yudi; Robert Napitupulu; Angga Sateria
Prosiding Seminar Nasional Inovasi Teknologi Terapan Vol. 6 No. 1 (2026): Prosiding Seminar Nasional Inovasi Teknologi Terapan
Publisher : Politeknik Manufaktur Negeri Bangka Belitung

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Abstract

The screw press machine is a main piece of equipment in the palm oil processing process, functioning to extract oil from palm fruit. Machine damage can reduce productivity, increase downtime, and disrupt the production process. This final project aims to identify damage to the screw press machine at PT. Gunung Sawit Bina Lestari, analyze the causes of damage using the 5 Why method, and implement corrective maintenance as a repair action. The method used is descriptive with a case study approach. Data were obtained through observation, interviews, documentation, and literature study. The results showed that the main damage occurred to the screw press, bushing hollow lengthening, and hydraulic motor rubber coupling. The 5 Why analysis showed that screw press damage was caused by excessive workload and the component's service life approaching the hour meter limit, bushing damage was caused by insufficient lubrication and the absence of scheduled maintenance, while rubber coupling damage was caused by hydraulic pressure exceeding the standard. Corrective maintenance was carried out through disassembly, inspection, cleaning, lubrication, replacement of damaged components, and machine testing. The repair results showed that the machine returned to stable operation, vibration was reduced, the hydraulic system functioned normally, and the pressing process operated properl.
KARAKTERISTIK GETARAN GENERATOR PADA KASUS UNBALANCE BERDASARKAN DATA VIBROPORT DAN MEMS AKSELEROMETER ADXL345 Rio Farhan; Lalito Prayoga; Angga Sateria; Muhammad Riva'i
Prosiding Seminar Nasional Inovasi Teknologi Terapan Vol. 6 No. 1 (2026): Prosiding Seminar Nasional Inovasi Teknologi Terapan
Publisher : Politeknik Manufaktur Negeri Bangka Belitung

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Abstract

This study aims to analyze the vibration characteristics of a 3 kW generator due to unbalance and to compare the performance of the Vibroport 80 vibration meter with the ESP32-based MEMS ADXL345 accelerometer sensor. Unbalance conditions were created by adding 10 g, 15 g, and 20 g of mass to the generator fan at a rotational speed of ±1,491 RPM (24.8 Hz). Radial vibration data were processed using the Fast Fourier Transform (FFT) method to obtain frequency spectra and velocity RMS values. The results show that unbalance is characterized by dominant amplitude at the 1×RPM frequency (24.8–25.0 Hz), which increases proportionally with added mass, reaching 1.89 mm/s, 2.11 mm/s, and 2.81 mm/s (Vibroport). Comparison between the two instruments shows good agreement in dominant frequency identification, with deviations of 0–0.59 Hz, although ADXL345 amplitude values tend to be slightly lower, with average deviations of 0.20–0.66 mm/s. Therefore, the ADXL345 sensor has potential as a low-cost vibration monitoring tool for detecting dominant frequency trends caused by unbalance, although further calibration is required for absolute amplitude accuracy.