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Jurnal Polimesin
Published by Politeknik Negeri Lhokseumawe
ISSN : 16935462     EISSN : 25491199     DOI : http://dx.doi.org/10.30811/jpl
Core Subject : Science, Engineering,
Automotive Engineering Control & Systems Engineering Engineering Materials Science & Nanotechnology Mechanical Engineering
Polimesin mostly publishes studies in the core areas of mechanical engineering, such as energy conversion, machine and mechanism design, and manufacturing technology. As science and technology develop rapidly in combination with other disciplines such as electrical, Polimesin also adapts to new facts by accepting manuscripts in mechatronics. In Biomechanics, Mechanical study in musculoskeletal and bio-tissue has been widely recognized to help better life quality for disabled people and physical rehabilitation work. Such a wide range of Polimesin could be published, but it still has criteria to apply mechanical systems and principles. Exceeding the limitation has been a common reason for rejection by those outside the scope. Using chemical principles more than mechanical ones in material engineering has been a common reason for rejection after submission. Excessive exploration of the management within the discipline of Industrial Engineering in the manufacturing technology scope is also unacceptable. The sub-scope biomechanics that focuses on ergonomics and does not study movement involving applied force on the bio-tissue is also not suitable for submission.
Arjuna Subject : Teknik (semua kategori) - Teknik Mesin
Articles 23 Documents
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Search results for , issue "Vol 23, No 3 (2025): June" : 23 Documents clear
Implementation of total quality management and importance-performance analysis for technical service optimization in a maintenance workshop : a case study of PT XYZ Khadafi, M; Away, Yuwaldi; Dirhamsyah, M
Jurnal Polimesin Vol 23, No 3 (2025): June
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v23i3.6860

Abstract

Customer satisfaction is a key factor of success in service-based industries and is equally important in technical service environments such as PT XYZ’s mechanical repair workshop, which provides civil works, welding, machinery, and valve maintenance services. This study aims to assess service quality and identify the primary factors influencing customer satisfaction, with the objective of formulating strategic improvements tailored to the workshop setting. A quantitative research approach was adopted, incorporating the SERVQUAL dimensions and the Total Quality Management (TQM) framework, while customer loyalty was measured using the Net Promoter Score (NPS). The study involved 93 internal respondents from various organizational units, with work experience ranging from less than five years to more than twenty years. Results indicate a high level of satisfaction, with a Net Promoter Score of 57.29% and an Internal Customer Satisfaction (ICS) Index of 86.9%. Multiple linear regression analysis showed that service quality and Total Quality Management collectively explained 84.3% of the variance in customer satisfaction. Importance and Performance Analysis (IPA) identified education and training, customer focus, and reliability as the top strategic improvement priorities. From an operational perspective, the most frequently requested services included pump shaft fabrication (item code 63-GA-6004, 30 hours), shaft sleeve fabrication (63-GA-6004, 16 hours), and shaft sleeve fabrication (56-GA-4002, initially 36 hours). Following the implementation of these improvements, the workshop achieved a 20 percent reduction in average processing time and completed 182 service activities within two months, significantly enhancing operational efficiency and customer satisfaction.
Effect of internal geometry on the tensile strength of SLA-printed resin using a formlabs 3D printer Roberth Marshall Ratlalan; Muh Farid Hidayat
Jurnal Polimesin Vol 23, No 3 (2025): June
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v23i3.6605

Abstract

Stereolithography (SLA) is developing rapidly as a 3D printing technology in manufacturing high precision resin-based parts.  This research investigates the influence of internal geometry on the tensile strength of samples printed with a Formlabs SLA printer using dental resin. Three types of internal geometries of solid control, triangular lattice, and honeycomb lattice were compared and evaluated. Samples were designed using Autodesk Inventor according to ASTM D638 standards and printed with symmetry axis dimensions of 5 mm and 10 mm and a consistent thickness of 5 mm. Tensile testing was conducted to analyze the influence of resin material type, internal geometry design, and dimensional parameters on their mechanical properties. The results showed that the solid internal geometry achieved the highest average tensile stress of 33.33 MPa meanwhile the triangular geometry with 5 mm configuration exhibited superior tensile performance compared to the honeycomb design.
Fluid pressure optimization of a PID-controlled hydraulic jack for enhanced lifting efficiency and stability Hairil Budiarto; Ibnu Irawan; Achmad Imam Sudianto; Ahmad Sahru Romadhon
Jurnal Polimesin Vol 23, No 3 (2025): June
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v23i3.6650

Abstract

Hydraulic and mechanical jacks are widely used for lifting applications but face limitations in efficiency and load handling. Despite being powerful, hydraulic jacks are prone to pressure loss and fluid leakage under static load, while mechanical systems lack automation and practicality. This research presents a hybrid hydraulic jack system integrating a DC motor-driven screw actuator and proportional–integral–derivative (PID) control for adaptive fluid pressure regulation. The purpose of this research is to develop an automatic hydraulic jack that integrates mechanical and hydraulic systems to improve the efficiency of load lifting time and reduce the risk of fluid leakage due to prolonged static pressure. The system was tested under three different loads: 90 kg, 110 kg, and 130 kg, with corresponding pressure setpoints of 170, 195, and 223 psi. Using the Ziegler–Nichols tuning method, the PID controller achieved high accuracy with error deviations of 1.1 psi, 0.1 psi, and 1.5 psi, respectively. These results represent a 95–99% precision rate in pressure regulation, compared to uncontrolled systems. The findings demonstrate the ability of the system to maintain pressure stability under varying load conditions, therefore reducing the risk of leakage and mechanical fatigue. This PID-based jack offers a cost-effective and efficient alternative to conventional power-pack hydraulic systems, particularly in mobile or resource-constrained applications.

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