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Ramli Ramli
Teknik Mesin, Fakultas Teknik, Politeknik Manufaktur Negeri Bangka Belitung
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PERBAIKAN APRON DAN TAILSTOCK PADA MESIN BUBUT DOALL Febrianto, Muhammad Yori; Wibowo, Kasih; Ramli, Ramli; Hasdiansah, Hasdiansah
Prosiding Seminar Nasional Inovasi Teknologi Terapan Vol. 5 (2025): Prosiding Seminar Nasional Inovasi Teknologi Terapan
Publisher : Politeknik Manufaktur Negeri Bangka Belitung

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Abstract

A lathe machine is one of the primary machine tools used in manufacturing processes, which rotates a workpiece to facilitate cutting operations with the aid of a cutting tool. The apron and tailstock components on the DoAll Lt. 13 No 03 lathe play a crucial role in maintaining precision and ensuring smooth turning operations. The apron functions to control the automatic movement of the cutting tool along the longitudinal and transverse axes, while the tailstock provides additional support for the workpiece, especially during long turning operations or drilling. Common issues with the apron include wear on the lead screw, whereas the tailstock often experiences misalignment and wear on the bushing thread of the spindle. This study was conducted to repair these damages through disassembly, cleaning, visual inspection, measurement, replacement of damaged components, and realignment. The repair results showed improved machine performance in terms of movement precision and operational stability. By performing regular maintenance and repairs, the lathe machine’s working efficiency can be sustained over the long term.
PREVENTIVE MAINTENANCE SISTEM PENDINGIN MESIN YANMAR 6AYM-WST Farera, Alfathir; Aswin, Fajar; Ramli, Ramli
Prosiding Seminar Nasional Inovasi Teknologi Terapan Vol. 5 (2025): Prosiding Seminar Nasional Inovasi Teknologi Terapan
Publisher : Politeknik Manufaktur Negeri Bangka Belitung

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Abstract

Preventive maintenance is a method of maintaining machinery before damage occurs. The Yanmar 6AYM-WST engine serves as the driving force for the dredge pump on the Production Suction Vessel (KIP) at PT. Timah Tbk, which sometimes experiences overheating during operation due to an underperforming cooling system. This final project aims to design a preventive maintenance system for the engine’s cooling system. The methods used include observation, interviews, literature study, and data collection of past breakdowns. The outcome of this study includes an annual maintenance schedule, work specifications, control cards, and machine history cards that are structured and ready for implementation. With this approach, it is expected to reduce the frequency of cooling system failures, improve engine reliability, and achieve operational efficiency of the vessel.
PEMBUATAN MEDIA AJAR RANGKAIAN LISTRIK DAN SIMULASI MELALUI APLIKASI SIMURELAY Afrizal, Ragil; Maulana, Irfan; Aswin, Fajar; Ramli, Ramli
Prosiding Seminar Nasional Inovasi Teknologi Terapan Vol. 5 (2025): Prosiding Seminar Nasional Inovasi Teknologi Terapan
Publisher : Politeknik Manufaktur Negeri Bangka Belitung

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Abstract

The problem in the practicum of electrical circuits at the Bangka Belitung State Manufacturing Polytechnic is the unavailability of structured, safe, and effective teaching media. This causes difficulties for students in understanding the concept of wiring diagrams, the use of electrical components, as well as motor control and lighting systems. The purpose of this final project is to design and create simulation-based teaching media for electrical circuits using the Simurelay application. The methods used include data collection through observation, interviews, and practical experience evaluation. The media is designed using industry standard electrical components such as contactors, relays, transformers, timers, and 3-phase electric motors. The test results showed that all circuits, including AC/DC light circuits, traffic light simulations, and CW, CCW, and star-delta motor controllers, were successfully executed according to function. Simulations using the Simurelay application confirm that the designed scheme has run well and according to plan. This media is considered to facilitate the learning process, improve understanding of basic electrical concepts, and support safety and efficiency in practicum. Thus, this teaching media is feasible to be applied as a teaching aid in the technical vocational education environment.
Studi Eksperimental Twin Waterjet Thruster Menggunakan Thermoplastic Polyurethane (TPU) yang Diproduksi dengan 3D Printing Hasdiansah, Hasdiansah; Muhamad Aris; Pristiansyah; Ramli; Sugianto; Ferzy Ersandy; Achmad Rusdy; Hafiz Fadhil; Muhammad Subhan
ARMATUR : Artikel Teknik Mesin & Manufaktur Vol. 7 No. 1 (2026): Jurnal Armatur (in Progress)
Publisher : Universitas Muhammadiyah Metro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24127/armatur.v7i1.10222

Abstract

Indonesia, as the world’s largest archipelagic nation, requires efficient and reliable marine propulsion systems to support sustainable transportation. The waterjet thruster has emerged as an alternative to conventional propellers due to its advantages in maneuverability, cavitation resistance, and operational efficiency. With the advancement of additive manufacturing, particularly 3D printing, opportunities have arisen to fabricate propulsion components using innovative materials such as Thermoplastic Polyurethane (TPU), which combines flexibility and durability.This study presents the design, fabrication, and experimental testing of a twin waterjet thruster produced with TPU material through the Fused Deposition Modeling (FDM) method. Performance tests were conducted using a 22 HP combustion engine at 4,100 rpm. The experimental results indicate that the thrust generated ranged between 10.8–12 kg (equivalent to 105.94–117.72 N) with an average thrust of 11.36 kg (111.24 N). These outcomes demonstrate that the system delivers consistent performance with minimal variation between trials. The findings confirm the feasibility of TPU-based twin waterjet thrusters for small to medium-scale marine applications and provide a basis for further development toward environmentally friendly propulsion systems through design optimization and the integration of electric motors.
The impact of nozzle temperature on the shrinkage of annealed 3D printed PLA Sugianto, Sugianto; Meriatun, Meriatun; Pristiansyah, Pristiansyah; Ramli, Ramli; Wardiyah, Atikah Araminta; Hasdiansah, Hasdiansah; Herianto, Herianto
Jurnal Polimesin Vol 24, No 1 (2026): February
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v24i1.8196

Abstract

Thermal annealing is used to strengthen the mechanical performance and thermal stability of fused deposition modeling (FDM) parts made from polylactic acid (PLA). This treatment frequently introduces dimensional shrinkage, compromising geometric accuracy and limiting the reliability of printed components in demanding applications. Among the printing parameters, nozzle temperature is a key variable because it influences melting behavior, interlayer diffusion, and the buildup of internal stresses, yet its role in managing shrinkage after annealing has not been clearly established. This study evaluates the influence of nozzle temperature on the anisotropic shrinkage of annealed PLA specimens across different specimen lengths and measurement directions (X and Y), with the main analysis conducted at selected nozzle temperatures ranged 195-230°C. Dimensional changes were quantified before and after annealing at 100°C for 60 min, and statistical evaluation was performed using analysis of variance (ANOVA) with post-hoc testing based on replicated specimens. The results confirm nozzle temperature as a significant contributor to shrinkage behavior, F (2,36) = 30.90, p 0.001, partial η²=0.63. Printing at 230°C consistently yielded the smallest dimensional reduction, outperforming both 210°C and 220°C. Within the examined range, 230°C emerges as the most effective nozzle setting for minimizing annealing-induced shrinkage, offering a practical processing window to improve dimensional accuracy and functional reliability in FDM-printed PLA parts.
Co-Authors Abda Abda Achmad Rusdy Afrizal, Ragil Agung Dharmawan Buchdadi Amelia Sholeha Anshari, Satria Aswin, Fajar Destria Kurnianti Dewi Susita Eko Yudo Farera, Alfathir Febrianto, Muhammad Yori Ferzy Ersandy Gunawan, Herri Hafiz Fadhil Hasdiansah, Hasdiansah Herianto Herianto Ilham Ary Wahyudie Irfan Maulana, Irfan Lukman Hakim Meriatun, Meriatun Muhamad Aris Muhamad Juniardi MUHAMMAD SUBHAN Pratama , Jhasua Pristiansyah, Pristiansyah Sugianto Sugianto Sugiyarto Sugiyarto Ventani, Embun Wardiyah, Atikah Araminta Wibowo, Kasih Yudha Pirmansyah, Sandika Yuhardin, Yuhardin Yuliyanto Yuliyanto Yuliyanto Zulfitriyanto, Zulfitriyanto