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All Journal IPTEK The Journal for Technology and Science Prosiding Semnastek JTT (Jurnal Teknologi Terpadu) Turbo : Jurnal Program Studi Teknik Mesin Machine : Jurnal Teknik Mesin Martabe : Jurnal Pengabdian Kepada Masyarakat Manutech : Jurnal Teknologi Manufaktur Jurnal Teknik Mesin Indonesia Budimas : Jurnal Pengabdian Masyarakat International Journal of Educational Review, Law And Social Sciences (IJERLAS) International Journal of Social Science, Educational, Economics, Agriculture Research, and Technology (IJSET) Jurnal Teknologi Dulang: Jurnal Pengabdian Kepada Masyarakat Prosiding Seminar Nasional Inovasi Teknologi Terapan Jurnal Inovasi Teknologi Terapan International Journal Of Synergi In Law, Criminal And Justice
Robert Napitupulu
Politeknik Manufaktur Negeri Bangka Belitung
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Pengaruh Fraksi Volume Terhadap Sifat Tarik Komposit Diperkuat Serat Tebu Dengan Matrik Poliester Harita, Revival Praise; Dharta, Yuli; Napitupulu, Robert
Jurnal Inovasi Teknologi Terapan Vol. 3 No. 1 (2025): Jurnal Inovasi Teknologi Terapan
Publisher : Politeknik Manufaktur Negeri Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33504/jitt.v3i1.282

Abstract

Indonesia, which has a tropical climate, is one of the largest producers of cane sugar in the world. Therefore, waste from the sugar cane production process has the potential to be an alternative material for composite material fillers, as it is easily available and environmentally friendly. Along with industrial development, innovation in composite materials is also advancing, especially thanks to the abundance of abundant and renewable resources. This research aims to develop composites from sugarcane fibers with polyester resin as the binder matrix. The prepared fibers were then soaked in 5% NaOH solution with volume fraction variations of 10%, 15%, and 20%, and arranged randomly. The composite manufacturing process was carried out using the hand lay-up method. Tests carried out on the specimens were tensile tests with ASTM D638 standards, which were carried out at the Bangka Belitung State Manufacturing Polytechnic. The results showed that the highest tensile strength was recorded at a volume fraction of 20% sugarcane fiber after soaking for 4 hours with NaOH, which was 27.94 MPa. In contrast, the lowest tensile strength was obtained at a volume fraction of 10% sugarcane fiber with 2 hours of NaOH immersion, which reached 24.25 MPa. This finding is consistent with previous research which shows that fiber volume fraction and immersion time with NaOH play an important role in increasing the strength of fiber structures in composites.
Analisis Ukuran Partikel Serbuk Arang terhadap Pengurangan Kadar Abu pada Briket Tempurung Kelapa Napitupulu, Robert; Pratama, Randa Julio; Dharta, Yuli
Jurnal Teknologi Vol 25, No 1 (2025): April 2025
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/teknologi.v25i1.6256

Abstract

As an environmentally friendly alternative fuel, coconut shell briquettes have the potential to replace fossil fuels. However, the main challenge in its use is the high ash content that reduces combustion efficiency and produces residues that are difficult to clean. This study focuses on analyzing the effect of charcoal particle size on reducing ash content in coconut shell briquettes. The method used was a full factorial experimental design with two process variables: the ratio of charcoal powder and tapioca starch (90%:10%, 85%:15%, 80%:20%), and charcoal particle size (40, 60, and 80 Mesh). To improve accuracy, each treatment combination was repeated three times. The stages of making briquettes include material preparation, mixing, molding, and drying. Ash content testing was conducted in accordance with SNI 01-6235-2000 standard. The results showed that charcoal particle size has a significant effect on ash content, where larger particles produce lower ash content. The lowest ash content, 1.49%, was found in briquettes with 40 Mesh particle size. This study makes an important contribution to the development of more efficient and environmentally friendly coconut shell briquettes.
Analisis Pengaruh Konsentrasi Perekat Tepung Tapioka terhadap Pengurangan Kadar Abu pada Briket Tempurung Kelapa Napitupulu, Robert; Pratama, Randa Julio; Dharta, Yuli
Jurnal Teknologi Vol 25, No 1 (2025): April 2025
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/teknologi.v25i1.6258

Abstract

Binder is a crucial component in briquette production, serving to consolidate charcoal particles into a solid form. This study aims to analyze the effect of tapioca starch concentration as a binder on the reduction of ash content in coconut shell briquettes. The binder concentrations used were 10%, 15%, and 20% of the total material mixture, with ash content testing conducted according to SNI 01-6235-2000 standards. The briquette production process included raw material preparation, mixing, molding, and drying. The results showed that binder concentration significantly affected the briquette's ash content. Lower binder concentrations resulted in reduced ash content, with the optimal ash content of 1.52% achieved at a 10% binder concentration. Excess binder tended to increase ash content due to residual binder that did not fully combust. These findings highlight the importance of controlling binder concentration to improve the quality of coconut shell briquettes as an alternative fuel source.
Penggunaan Fly Ash dalam Pembuatan Bata Beton untuk Meningkatkan Daya Kuat Tekan Napitupulu, Robert; Triyanto, Romy Ade; Juanda, Juanda
Jurnal Teknologi Vol 25, No 1 (2025): April 2025
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/teknologi.v25i1.6195

Abstract

Coal is an alternative energy that is used as energy for electricity generation and so on. The results of burning coal produce several wastes that are difficult to process and reuse, one of the wastes produced is fly ash, fly ash waste has several contents similar to cement material, one of which is silica. Use of fly ash as an additive to concrete bricks. This research aims to determine the effect of using fly ash as an additional material on compressive strength tests on concrete bricks and  to determine the highest and lowest values of the composition of fly ash and sand. In this research, we will use the full factorial method to determine the number of specimens that will be made in the research, variations in the composition of fly ash: sand used are 30%: 40%, 20%: 50%, and 10%: 60%, with a ratio of cement: water fixed 2 : 1 and drying for 3 and 5 days. Compressive strength testing will be carried out on 6 specimens with 3 replications on each specimen so that the total number of specimens tested is 18 specimens. Based on the results of the best compressive strength test on specimen No.1 with a mixture of fly ash (30%): sand (40%), with a drying time of 3 days, the average maximum strength was 56,86 kg/cm2.
EFFECTIVENESS OF CRIMINAL FINES ON ILLEGAL FISHING CRIMINAL ACTIONS BY FOREIGN FISHING VESSELS (KIA) IN THE WATERS OF THE INDONESIAN EXCLUSIVE ECONOMIC ZONE (ZEEI) OF THE MALACCA STRAIT (STUDY OF DECISIONS IN THE MEDAN DISTRICT COURT, CLASS 1A SPECIAL) Robert Napitupulu
International Journal of Synergy in Law, Criminal, and Justice Vol. 2 No. 2 (2025): Vol. 2 No. 2 (2025): SLP-IJSLCJ
Publisher : PT. Sinergi Legal Publisher

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Abstract

This study aims to analyze the effectiveness of the application of criminal fines against perpetrators of illegal fishing by Foreign Fishing Vessels (KIA) in the waters of the Indonesian Exclusive Economic Zone (ZEEI) of the Malacca Strait based on a study of the decision of the Medan District Court Class 1A Special Fisheries Court. Indonesia as an archipelagic country has a wealth of fishery resources that are vulnerable to illegal fishing practices, especially by foreign-flagged KIA. In the international maritime law regime (UNCLOS 1982), coastal states such as Indonesia have sovereign rights to enforce the law in the ZEEI, but are limited by the prohibition on the application of imprisonment to foreign violators. Therefore, criminal fines are the main alternative in law enforcement. The results of the study show that of the 137 fisheries crime cases decided during the period 2015–May 2025, 66 cases involved KIA with the majority being sentenced to fines and confiscation of evidence. The effectiveness of fines is shown by the significant decline in the trend of cases in the last five years, as well as the deterrent effect on foreign perpetrators. However, challenges are still found related to the success of fine recovery and coordination between law enforcers. This study confirms that although fines have not been fully optimal in their implementation, they have substantively been able to contribute to the protection of fishery resources and Indonesia's legal sovereignty at sea. Consistent law enforcement and increasing the capacity of fisheries courts are absolute requirements in strengthening the national maritime supervision and justice regime.
RANCANG BANGUN MESIN PENGAYAK PASIR GUNA MENINGKATKAN KUALITAS PENGAYAK PASIR UNTUK KONSTRUKSI BANGUNAN Napitupulu, Robert; Herwandi, Herwandi; Hernawan, Sutrisno; Rio, Rio Pratama; Purma , Purma
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 increasing demand for construction materials, particularly sand, continues to rise in line with the rapid development of infrastructure. Manual sand sieving is still widely used, especially in rural areas, but it has proven to be inefficient due to its labor-intensive nature, time consumption, and limited capacity. Therefore, this final project focuses on designing and building an automatic rotary sand sieving machine with a capacity of 130 kg/hour. The machine is powered by a 5 HP gasoline engine and utilizes a belt and pulley transmission system, combined with a sand mesh size of 6 (2.83 mm). The design process adopts the Research and Development (R&D) method, consisting of problem identification, data collection, design, manufacturing, assembly, testing, and user validation. Based on testing results, the machine is capable of producing consistently fine sand suitable for wall plastering in construction. One of the key advantages of this machine lies in its ease of maintenance, especially in replacing the sand mesh, allowing users to adapt the sieve size according to specific requirements. Furthermore, technical calculations such as torque estimation, motor power, angular velocity, and system efficiency have been comprehensively conducted to ensure optimal performance. The implementation of this machine is expected to significantly improve work productivity, reduce reliance on manual labor, and enhance time and cost efficiency in the sand sieving process at construction sites.
ANALISIS KERUSAKAN MESIN FRAIS FEHLMANN PICOMAX 20 MENGGUNAKAN METODE ROOT CAUSE ANALYSIS DI POLMAN BABEL Sitinjak, Harpois S; Pratama, Adrian Deka; Masdani, Masdani; Napitupulu, Robert
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

This study aims to identify the root cause of damage to the vertical head motion mechanism of the Fehlmann Picomax 20 milling machine at the Bangka Belitung State Polytechnic of Manufacturing using the Root Cause Analysis (RCA) method. This descriptive research with a qualitative approach involves collecting primary data through direct observation and interviews with machine operators and technicians. Secondary data is obtained from the machine's repair history and related literature. Analysis using the 5W+1H and Fishbone Diagram methods reveals that the machine damage is caused by irregular maintenance, the use of inappropriate lubricating oil, the use of low-quality components, and untrained operators. The recommendations for improvement include operator training, regular repairs, the use of appropriate materials, and environmental maintenance. This research successfully achieves its main objective, which is to systematically identify and analyze the root cause of machine damage and provide improvement recommendations to prevent recurring damage.
IDENTIFIKASI DAN PERBAIKAN KERUSAKAN MESIN BUBUT HORIZONTAL GEMINIS NO. 19 MENGGUNAKAN METODE 5 WHY Ariel, Ariel; Meidiantara , Muhammad Rizki; Ariyanto, Ariyanto; Napitupulu, Robert
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

This study aims to identify the root cause of the failure of the No. 19 Horizontal Geminis Lathe at the Bangka Belitung State Polytechnic of Manufacturing and to recondition the machine to restore its functionality. The 5 Why method was used to analyze the electrical system failure, identifying that the damage to the manual circuit motor and diode was caused by a fragile and broken on/off lever due to lack of maintenance. After component replacement and repair, geometric testing showed that the machine met the established standards. The study concludes that the 5 Why method is effective in identifying root causes and that the repairs successfully restored machine performance. Recommendations are expected to improve the availability of lathes for student practicals and enhance understanding of systematic machine repair techniques.
PERANCANGAN MESIN PENCUCI KERANJANG INDUSTRI DI PT. BERDIKARI METAL ENGINEERING Muharramin, Areza; Samosir, Reguel; Napitupulu, Robert; Haritsah Amrullah, Muhammad
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

Industrial crate washing is a crucial activity in maintaining hygiene and operational efficiency within the manufacturing sector. PT. Berdikari Metal Engineering faces challenges due to a manual washing process that is labor-intensive, time-consuming, and only capable of cleaning 25 crates per day out of a 150-crate target. This study aims to design an automatic crate washing machine with a focus on high-pressure washing systems to enhance process effectiveness. The design method follows the VDI 2222 approach, consisting of planning, conceptualization, design, and simulation stages. The machine features three main zones: washing, rinsing, and drying, where washing and rinsing utilize a jet pump system. Technical calculations determined that the required motor pump power for the washing zone is 10 HP, based on the number of nozzles, flow rate, and spray pressure of 80 psi. Simulation results using SolidWorks indicate that the machine structure is safe, with stress and safety factor values within acceptable limits. In conclusion, the design successfully delivers an efficient washing system that meets the company's daily production targets and reduces reliance on manual labor.
PERBAIKAN SISTEM PENGEREMAN PADA MESIN BUBUT DoAll Lt 13 DI BENGKEL MEKANIK POLMAN BABEL Ferdian, Ferdian; Ariansyah, Ariansyah; Napitupulu, Robert; Pristiansyah, Pristiansyah
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

Repair the braking system on the DoAll Lt 13 no 4 lathe In completing the final project entitled Repair of the Cooling System and Braking System on the Doall Lt13 Lathe at the Bangka Belitung State Manufacturing Polytechnic, stages of adjustment are made to the flowchart diagram. Problem identification is a crucial stage because if the problem is not identified correctly, the solution applied may not be effective or may even worsen the situation, accurate and in-depth identification also helps ensure that the solution developed will be relevant and effective. In the data collection action there are several methods used to find out the problems and damage that occur in the DoAll LT 13 lathe. The methods used are the technician interview method, looking at the manual book, looking at the machine history book and conducting direct observation on the machine. The following is the initial data from several methods carried out Based on the results of the DoAll LT13 Lathe Brake System repair function test using a clutch motor braking system, the braking system was successfully repaired, and was able to work well and was able to brake. And for the repair of the cooling system on the DoAll Lt 13 no 4 lathe, it was also successfully repaired and obtained optimal results for all components that were repaired.
Co-Authors Abda Abda Adhe Anggry Aldi Pratama Angelika, Vanessa Anugrah Harita, Efata Aqila Zanjabila Ariansyah Ariansyah, Ariansyah Ariel, Ariel Arif Wahyudi Ariyanto Ariyanto Arliansyah, Arul Arriyani, Yang Fitri Arsieka Putri, Diviya Benny Nainggolan Better Swengky chardova, andreas Christianty, Licia Clara Lavita Angelina Darta, Yuli Devaned Parlindungan Dharta, Yuli Diviya Arsieka Putri Doni Dyas Ryfkiansyah Efata Anugrah Harita Efata Anugrah Harita Eko Yudo Erin Aftarini Fadhlurrahman, Miftah Febri Sulistiyo Febrian Arif Ferdian, Ferdian Feriadi, Indra Firdi Irawan Gemanial, Juan Gilang Perdana Haikal ikhsan, Muhammad Harita, Revival Praise Harwadi, Harwadi Hasdiansah, Hasdiansah HERMANSYAH RHOMADAN Hernawan, Sutrisno Herwandi Herwandi Husman Husman Idiar, Idiar Indradewa, Rhian Irawan, Rizki Irwan Irwan Jekki Dodi Parlindungan Sihombing Juanda Juanda Juanda Kasim Kris Josua Pardede Kris Josua Pardede Kris M Romario4 M. Haritsah Amrullah M. Luqman Hakim Siregar Mar'i Akbar, Firzan Masdani, Masdani Meidiantara , Muhammad Rizki Muhammad Akbar Muhammad Bahit Muhammad Haritsah Amrullah Muhammad Yunus Muharramin, Areza Nanda Pranandita Nurwijayanti Parlindungan, Devaned Pranata, Yogi Pratama, Adrian Deka Pratama, Aldi Pratama, Randa Julio Pristiansyah, Pristiansyah Purma , Purma Reni Febrianti Ridho Bagus Purwansyah Rio, Rio Pratama Rodika Roland Banjarnahor Roperiadi RR. Ella Evrita Hestiandari Rullyansyah Samosir, Reguel Samuel Napitupulu, Rabinaswil Saputra, Benediktus Handaru Sateria, Angga Shanty Dwi Krishnaningsih Shanty Dwi Krisnaningsih Shanty Dwi Krisnaningsih Sihombing, Risna Primauli Simangunsong, Kristian Jubatner Sitinjak, Harpois S Soepangkat, Bobby Oedy Pramoedyo Sri Devi Zebua Subkhan Subkhan Subkhan Subkhan Sugianto Sugianto Suzen, Zaldy Sirwansyah Syaiful Asmi Hasibuan, Syaiful Asmi Triyanto, Romy Ade Utrechk Ricardo Yasmirah Mandasari Saragih Yuli Dharta Yuliyanto Yuliyanto Yuspita, Ni Luh Eta Zaldy Kurniawan