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All Journal Jurnal Vokasi ARMATUR : Artikel Teknik Mesin dan Manufaktur Jurnal Polimesin Mekanika: Jurnal Teknik Mesin
Andreas Luki Indratmoko
Politeknik Tunas Garuda
Aerospace Engineering Automotive Engineering Control & Systems Engineering Economics, Econometrics & Finance Education Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Social Sciences

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Effect of Full Annealing and Single Quenching-Tempering Heat Treatment on the Mechanical Properties of JIS SUP 9A Steel Andreas Luki Indratmoko; Irza Sukmana; Mohammad Badaruddin
Jurnal POLIMESIN Vol 21, No 2 (2023): April
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v21i2.3523

Abstract

JIS SUP 9A leaf spring steel under hot-forging conditions was subjected to full annealing (FA) and single step-quenching-tempering heat treatments (SQT). Tensile test specimens to ASTM E 8 standards have been prepared. The FA process was performed by heating all specimens in the furnace at a constant temperature of 800°C for 2 hours, followed by cooling in the furnace. Then, all test specimens were heat-treated SQT. The SQT process was carried out by heating all samples in a furnace at 800°C for 1 hour and 650°C for 1 hour, each followed by immersion in crude palm oil (CPO) media at a liquid temperature of 70°C until the specimens reached 100°C. The FA process removes internal stresses with high microstructural softness and SQT produces a fine martensitic phase microstructure, which improves mechanical strength (tensile strength and impact strength) with good ductility. Electron and scanning microscopy have been used to determine the concentration of impurities and microstructural changes in relation to the mechanical properties of the specimen concerned. The results showed that the yield limit, maximum tensile stress, and impact energy increased by 113.5%, 16.3%, and 705.2%, respectively. However, hardness decreased by 18.8% for SQT specimens against FA after heat treatment. This research utilizes industrial waste, which is available quite a lot; in the future, it will become an alternative for handling environmental problems. The abundant availability of raw materials and resulting strength-toughness are the main advantages of this heat treatment
Pengaruh Holding Time dan media pendingin pada proses quenching terhadap kekerasan dan kekuatan Impact pegas daun sebagai alternatif pengganti pisau slicer penuai tebu Indratmoko, Andreas Luki; Nugroho, Eko; Asroni, Asroni; Budiyanto, Eko
ARMATUR : Artikel Teknik Mesin & Manufaktur Vol. 1 No. 2 (2020): Jurnal Armatur
Publisher : Universitas Muhammadiyah Metro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (625.847 KB) | DOI: 10.24127/armatur.v1i2.341

Abstract

In the process of harvesting sugarcane at a sugar factory, the Sugarcane Harvester is a tractor used to harvest sugarcane equipped with a slicer knife. Nowadays slicers are still imported from abroad, and the availability is scarce and the price is still expensive. One of the efforts to find an alternative to the slicer is to use leaf springs by hardening the metal through a heat-treatment process. Namely the process of heating steel to temperatures above the critical area followed by rapid cooling called quenching. The purpose of this study was to determine the effect of holding time and the effect of cooling media on the hardness and impact strength of leaf springs and to determine the ideal holding time and the most optimal cooling media to increase the hardness and impact strength of leaf springs. As for the research method, the spring leaves were heat-treated with a temperature of 8500 C for 30 minutes and 60 minutes and then cooled using oil, saltwater, and water as media. The method used is observation, literature study, testing, and documentation. The results obtained from this study were at a temperature of 8500 C with a holding time of 30 minutes the best hardness value was 477 VHN and 0.42% increase, the best impact strength value was 0.03433 J / mm2 and 87.71% decrease, and the two cooling media, namely oil. At a temperature of 8500C with a holding time of 60 minutes the best hardness value was 534 VHN and 12.42% increase, the best value of impact strength was 0.03203 J / mm2 and 88.53% decrease, and the two cooling media were oil as well. So that oil is the most optimal medium for changing the mechanical properties of the Sugarcane Harvester slicer because the oil can carry a carbon layer from the cooling process that takes place and the cooling rate of the oil is not too fast from the cooling media of brine and water because of its viscosity. Keywords: Holding Time, Cooling Media, Hardness, Impact Strength, Quenching, Leaf Spring, Slicer.
Penataan Lahan Bekas Pembuangan Sampah Terbuka Menggunakan Alat Berat Untuk Lingkungan Permukiman Yang Lebih Sehat Dan Produktif Bagi Warga Masyarakat Di Lokasi PT Gula Putih Mataram, Kel. Mataram Udik Kec. Bandar Mataram Kab. Gunung Sugih - Lampung Tengah Andreas Luki Indratmoko; Purnomo Purnomo; Bagas Prabowo; Atik Pramono; Yulius Riansa; Suraya Suraya; Endra Saputra; Erik Tri Mahyudi
Jurnal Vokasi Vol 9, No 3 (2025): November
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/vokasi.v9i3.8287

Abstract

Permasalahan utama yang dihadapi masyarakat di sekitar kawasan PT Gula Putih Mataram, Kelurahan Mataram Udik, Kecamatan Bandar Mataram, Kabupaten Gunung Sugih, Lampung Tengah, adalah keberadaan lahan bekas pembuangan sampah terbuka yang menimbulkan dampak lingkungan dan kesehatan. Area tersebut memiliki sejumlah lubang bekas pembuangan dan praktik pembakaran sampah yang menyebabkan pencemaran udara, degradasi tanah, serta berpotensi menjadi sumber penyakit bagi warga sekitar. Kondisi ini menunjukkan perlunya upaya penataan dan rehabilitasi lahan secara terpadu agar dapat dimanfaatkan kembali secara produktif serta mendukung kualitas lingkungan permukiman yang lebih sehat. Kegiatan Pengabdian kepada Masyarakat (PkM) tahap kedua ini bertujuan untuk menata dan merehabilitasi lahan bekas pembuangan sampah tersebut dengan memanfaatkan teknologi alat berat secara efektif dan efisien. Melalui pendekatan lintas disiplin, kegiatan ini melibatkan tiga program studi: Pemeliharaan Alat Berat, yang bertanggung jawab atas operasional dan pemeliharaan unit alat berat selama proses pembersihan dan perataan lahan; Teknologi Manufaktur, yang mendukung aspek teknis seperti desain tata letak lahan pasca-penataan serta modifikasi peralatan ringan; dan Teknologi Rekayasa Mesin Pertanian, yang memberikan rekomendasi pemanfaatan lahan hasil reklamasi untuk kegiatan pertanian produktif atau penghijauan lingkungan. Metode pelaksanaan meliputi tahapan observasi awal dan pemetaan kondisi eksisting, perencanaan teknis penataan lahan, pelaksanaan operasional alat berat untuk pembersihan dan pemadatan, serta pelatihan dan sosialisasi kepada masyarakat terkait pengelolaan pasca-rehabilitasi. Kegiatan ini menghasilkan perubahan signifikan berupa terbentuknya lahan yang bersih, aman, dan siap digunakan untuk fungsi produktif masyarakat. Selain itu, terdapat peningkatan kesadaran masyarakat dalam menjaga kebersihan lingkungan dan mengelola sampah secara berkelanjutan. Secara keseluruhan, kegiatan Pengabdian ini berhasil memberikan kontribusi nyata terhadap peningkatan kualitas lingkungan dan pemberdayaan masyarakat sekitar PT Gula Putih Mataram, serta dapat menjadi model implementatif bagi wilayah lain yang memiliki permasalahan serupa dalam pengelolaan lahan eks-pembuangan sampah terbuka.
Pelatihan Pengoperasian Mesin Test Bench dan Kalibrasi Pompa Injeksi Mitsubishi 8DC9 untuk Meningkatkan Kompetensi Keahlian Teknik Alat Berat di SMK Sugar Group Erik Tri Mahyudi; Luki Indratmoko; Christian Cahya Putra; Endra Saputra
Jurnal Vokasi Vol 10, No 2 (2026): Juli
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/vokasi.v10i2.9004

Abstract

Keterbatasan kompetensi guru dan siswa dalam pengoperasian mesin test bench serta proses kalibrasi pompa injeksi masih menjadi kendala dalam pembelajaran praktik teknik alat berat di SMK Sugar Group. Oleh karena itu, kegiatan pengabdian kepada masyarakat ini bertujuan untuk meningkatkan kompetensi keahlian teknik alat berat kepada guru dan siswa melalui pelatihan pengoperasian mesin test bench dan kalibrasi pompa injeksi Mitsubishi 8DC9. Metode pelaksanaan kegiatan meliputi pemberian materi teori, demonstrasi alat, serta praktik langsung pengujian dan penyetelan pompa injeksi sesuai standar pabrikan. Peserta pelatihan terdiri dari guru dan siswa kompetensi keahlian teknik alat berat SMK Sugar Group. Hasil kegiatan menunjukkan peningkatan pemahaman peserta terhadap prinsip kerja sistem bahan bakar diesel, prosedur pengujian pompa injeksi, serta kemampuan melakukan kalibrasi dengan benar menggunakan mesin test bench. Selain itu, peserta mampu mengidentifikasi parameter kinerja pompa injeksi seperti debit bahan bakar, tekanan injeksi, dan keseragaman suplai antar silinder. Kegiatan ini diharapkan dapat mendukung peningkatan kualitas pembelajaran praktik, kesiapan lulusan menghadapi kebutuhan industri alat berat, serta memperkuat sinergi antara dunia pendidikan vokasi dan industri.
MODIFIKASI DIGITAL COMPRESSION TESTER SEBAGAI ALAT DIAGNOSA KEBOCORAN KOMPRESI PADA ENGINE TRAKTOR JOHN DEERE 6068 Erik Tri Mahyudi; Bagas Prabowo; Endra Saputra; Luki Indratmoko
MEKANIKA: Jurnal Teknik Mesin Vol 12 No 1 (2026): July
Publisher : Program Studi Teknik Mesin, Universitas 17 Agustus 1945 Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Engine compression leakage testing is a crucial step in preventive maintenance to detect performance issues. However, conventional compression testers often have limitations in terms of accuracy and inefficient data documentation capabilities. Therefore, this research aims to modify a digital compression tester set to be a more accurate and efficient diagnostic tool for detecting compression leakage on John deere 6068 tractor engines. Testing was conducted by comparing the measurement results of the modified tool with a conventional tool on tractor engines experiencing a performance decline. Based on the research results that have been conducted, it can be concluded that the modification of the analog compression tester to a digital version has been successfully realized. The developed tool is capable of providing more accurate compression pressure measurement results with an average deviation of 0,56 % compared to the analog type of 3.88%.
Co-Authors Asroni, Asroni Atik Pramono Bagas Prabowo Bagas Prabowo Christian Cahya Putra EKO BUDIYANTO Eko Nugroho Endra Saputra Endra Saputra Irza Sukmana Mahyudi, Erik Tri Mohammad Badaruddin Purnomo Purnomo Suraya Suraya Yulius Riansa