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All Journal Rotasi Jurnal Ilmiah Giga Jurnal Rekayasa Mesin Conference SENATIK STT Adisutjipto Yogyakarta Indonesian Journal of Computing, Engineering, and Design Jurnal Studia Legalia Jurnal Pengabdian Teknologi, Ekonomi dan Humaniora Jurnal Sains & Teknologi Fakultas Teknik Universitas Darma Persada Prosiding SNTTM
Juan Pratama
Universitas Darma Persada
Aerospace Engineering Agriculture, Biological Sciences & Forestry Arts Humanities Chemical Engineering, Chemistry & Bioengineering Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Education Electrical & Electronics Engineering Engineering Industrial & Manufacturing Engineering Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Mechanical Engineering Social Sciences

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Enhancing Teachers Proficiency with Digital Interactive Learning Resources for Differentiated Instruction Yahya Yahya; Mira Febriana Sesunan; Nur Syamsiyah; Husen Asbanu; Juan Pratama; Linda Nur Afifa; Darsono
JEPTIRA Vol 3 No 1 (2025)
Publisher : Fakultas Teknik Universitas Darma Persada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70491/jeptira.v3i1.93

Abstract

The course seeks to enhance educators' competencies in creating customized learning experiences with digital interactive technologies, namely platforms like Wordwall and Quizizz. The event occurred on February 11, 2025, in the Bekasi region, involving high school and vocational school educators. The training materials encompassed the concept of diversified learning, an introduction to the Wordwall and Quizizz platforms, and exercises for developing interactive media that align with suitable teaching methodologies. The activity's outcomes demonstrated a notable enhancement in instructors' competencies in the creative and contextual utilization of digital media, alongside heightened understanding of the need of adaptive learning services tailored to student needs. This initiative enhances the transformation of digital education at the secondary school level.
Evaluation of a Nylon 3D-Printed Wrist Splint Through Finite Element Analysis (FEA) and User-Based Assessment Pratama, Juan; Anggara, Ardhito Yogie; Saputra, Ganang Arya; Sugiyanto, Didik; As'yari
Jurnal Rekayasa Mesin Vol. 20 No. 3 (2025): Volume 20, Nomor 3, Desember 2025
Publisher : Mechanical Engineering Department - Semarang State Polytechnic

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/jrm.v20i3.7126

Abstract

A wrist splint is a medical assistive device designed to limit wrist movement and provide structural support during post-operative rehabilitation. This study investigates the applicability of 3D printing technology for the fabrication of a customized wrist splint. Finite element analysis (FEA) was carried out to evaluate the mechanical performance of a nylon-based 3D-printed wrist splint, while a user assessment involving ten respondents was conducted to compare the 3D-printed prototype with the commercially available alternatives. The analysis revealed that the 3D-printed nylon splint could sustain loads well above the maximum force generated by human muscles, with normal and von-Mises stresses representing only 5.25% and 7.9% of the material’s ultimate tensile strength (UTS), and maximum flexural stress corresponding to merely 1.4% of its ultimate flexural strength (UFS). Based on user assessment, the 3D-printed splint outperformed commercial ones in terms of lightness, comfort, functionality, and stiffness, though it was less favorable in price and ease of use. Additionally, the findings indicate that the nylon-based 3D-printed wrist splint adequately satisfies the fundamental functional requirements of a wrist support device. Eventually, the results affirm the significant potential of 3D printing technology as a reliable and customizable manufacturing approach for wrist splint application.
Limitations of Interlocking Features in Rotary Friction Welding (RFW) of 3D-printed PLA Al Fathurrahman, Fauzan; Santoso, Fathur Rahman Naufal; Erwin; Sugiyanto, Didik; Pratama, Juan
Jurnal Rekayasa Mesin Vol. 21 No. 1 (2026): Volume 21, Nomor 1, April 2026
Publisher : Mechanical Engineering Department - Semarang State Polytechnic

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/jrm.v21i1.7419

Abstract

The limited build volume of fused deposition modeling (FDM) often necessitates the use of joining methods for larger components. However, the effectiveness of interlocking features in the RFW of 3D-printed polymers remains unclear. This study investigates the limitations of interlocking features in RFW of polylactic acid (PLA) by evaluating the effect of male-female geometry on the joint performance. The results show that all interlocked RFW joints exhibit significantly reduced tensile strength, reaching only approximately 30% of the control samples, accompanied by decreased ductility. Despite variations in the interlock geometry, no significant improvement in joint performance was observed. Failure analysis indicates that the excessive weld flash accumulation within the interlocking region generates internal pressure, which restricts material flow and promotes crack initiation. This leads to localized plastic deformation followed by brittle failure at the joint interface. These findings demonstrate that the interlocking geometry does not necessarily enhance joint quality in RFW of 3D-printed PLA and may introduce inherent limitations if not properly designed. This study highlights the critical role of material flow and geometric constraints in governing joint performance, emphasizing the need for optimized interlock design and process control in thermoplastic friction welding.
Design and Development of a Vertical-Shaft Organic Waste Chopper Machine with a Top-Mounted Agitator Susanto, Herry; Chan, Yefri; Pratama, Juan; Siregar, Rolan; Ferdiansyah, Rio; Mustofa, Hidayat; Mubarok, Muhammad Fauzan
Jurnal Rekayasa Mesin Vol. 21 No. 1 (2026): Volume 21, Nomor 1, April 2026
Publisher : Mechanical Engineering Department - Semarang State Polytechnic

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/jrm.v21i1.7431

Abstract

Conventional organic waste chopping machines predominantly utilize horizontal shaft configurations, which are highly susceptible to asymmetric load distribution and present ergonomic challenges during maintenance. As an innovative solution, this study presents the conceptual design of a vertical-shaft chopping machine integrated with a hydraulic-actuated top-head system to enhance the efficiency of particle size reduction. The scope of this research is strictly confined to theoretical mathematical modeling and numerical simulations. The design process complies with the ASME B106.1M standard for transmission shafts and EN 13683 for operational safety parameters, excluding experimental fabrication. A comprehensive analysis was conducted on three primary materials—Mild Steel (MS), Stainless Steel 304 (SS 304), and Stainless Steel 316L (SS 316L)—under fluctuating waste loads ranging from 10 kg to 35 kg. The analytical results demonstrate several crucial findings: the minimum safe shaft diameter ranges from 16 mm (utilizing SS 316L at a 10 kg load) to 28 mm (utilizing MS and SS 304 at a 35 kg load). Furthermore, the agitator's power requirement exhibits a strictly linear increase corresponding to the applied load (from 1.34 kW to 4.68 kW), whereas the hydraulic system operates efficiently with a constant power profile of 0.25 kW. Overall, the vertical shaft configuration significantly promotes symmetrical force distribution, while the hydraulic system ensures safe and immediate access to the chopping chamber. The proposed design demonstrates substantial structural, operational, and ergonomic advantages, establishing a robust theoretical foundation for future development and experimental fabrication.
Co-Authors Abdullah, Bulan Adam Zuyyinal Adib Afifa, Linda Nur Agus Salim, Urip Al Fathurrahman, Fauzan Anggara, Ardhito Yogie Arifviyanto, Budi As'yari Asyari Badranaya, Muhammad Imawan Budhi Susetyo, Ferry Budi Arifvianto Danindra Brian Kusuma DARSONO Darsono Didik Sugiyanto Erwin Fandikurnia, Ade Ferdiansyah, Rio Herry Susanto Husen Asbanu Husen Asbanu Linda Nur Afifa Luviana, Ervin Mira Febriana Sesunan Mira Febriana Sesunan Mubarok, Muhammad Fauzan Muslim Mahardika Mustofa, Hidayat Novendri, Yos Noverdo Mayanda Nur Syamsiyah Nur Syamsiyah Nurhasim Nurul Hikmah Saban, Muhamad Zaki Salim, Urip Agus Sandi, Aris Santoso, Fathur Rahman Naufal Saputra, Ganang Arya Siregar, Rolan Sukmaji Indro Cahyono Sukmaji Indro Cahyono, Sukmaji Indro Suyitno Wijaya, Rahman Yahya Yahya yefri chan Yendi Esye Yhauma, Mutamimul