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All Journal Jurnal Pengabdian Kepada Masyarakat (Indonesian Journal of Community Engagement) JOURNAL OF MECHANICAL ENGINEERING, MANUFACTURES, MATERIALS AND ENERGY Jurnal Rekayasa Material, Manufaktur & Energi Martabe : Jurnal Pengabdian Kepada Masyarakat AMALIAH: JURNAL PENGABDIAN KEPADA MASYARAKAT Jurnal Abdi Insani IRA Jurnal Teknik Mesin dan Aplikasinya (IRAJTMA) IRA Jurnal Pengabdian Kepada Masyarakat Jurnal Ilmiah Teknik Mesin & Industri (JITMI)
Bobby Umroh
Universitas Medan Area
Aerospace Engineering Agriculture, Biological Sciences & Forestry Arts Humanities Automotive Engineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Health Professions Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Mathematics Mechanical Engineering Social Sciences Other

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Studi Performa Mesin Pencacah Polimer Komposit Berbasis Uji Laboratorium Sianturi, Danial Jack Marbis; Tumangger, Theo Fredrik; Aldori, Yopan Rahmad; Iswandi, Iswandi; Umroh, Bobby
IRA Jurnal Teknik Mesin dan Aplikasinya (IRAJTMA) Vol 4 No 2 (2025): Agustus
Publisher : CV. IRA PUBLISHING

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56862/irajtma.v4i2.290

Abstract

Polymers are the result of monomer polymerization with a lower density than metals but a much smaller elastic modulus, making them less rigid and strongly affected by temperature. This study evaluates the performance of a laboratory-scale crushing machine for polypropylene blended with activated carbon at varying compositions. The machine employed carbon steel rotary blades driven by a 1 HP electric motor through a gearbox transmission. Results showed average crushing times of 3.5–4 minutes/kg. Pure polypropylene produced a 72% fine fraction, while adding 10% activated carbon reduced it to 65%. Crushing efficiency remained above 85%, demonstrating stable performance and feasibility for composite material applications.
PKM INOVASI LIMBAH JERAMI MENJADI PRODUK KERAJINAN TAS UNTUK MENINGKATKAN PENDAPATAN PADA DESA JATIKESUMA KECAMATAN NAMORAMBE KABUPATEN DELI SERDANG PROVINSI SUMATERA UTARA Syahputri, Yuni; Umroh, Bobby; Dewi Setia Tarigan, Eka
Martabe : Jurnal Pengabdian Kepada Masyarakat Vol 5, No 5 (2022): Martabe : Jurnal Pengabdian Kepada Masyarakat
Publisher : Universitas Muhammadiyah Tapanuli Selatan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31604/jpm.v5i5.1879-1882

Abstract

Kegiatan ini bertujuan untuk memberikan manfaat kepada mitra dalam penanganan limbah jerami padi menjadi produk kerajinan tas yang bernilai jual dan memberikan edukasi pemasaran berbasis tekhnologi/e-commerce. Metode yang dilakukan yaitu Pelatihan pembuatan kerajinan tas yaitu 1) Pelatihan pengolahan limbah jerami dengan tehnik anyaman, 2). Pembuatan Pola Tas, 3). Pelatihan pembuatan tas jerami dan perawatan tas jerami. Metode selanjutnya yaitu pendampingan pemasaran berbasis tekhnologi/e-commerce mulai dari pembuatan akun, cara mengupload gambar produk hingga memahami cara penjualannya.Kegiatan ini menghasilkan berbagai produk kerajinan tas berbahan limbah jerami yang dapat dipergunakan mitra bahkan dapat dipasarkan oleh mitra, mitra juga dapat memahami penggunaan pemasaran berbasis tekhnologi/e-commerce.
Pendampingan Layout Ulang Area Produksi dan Identifikasi Kebutuhan Teknologi pada UMKM Roti Pakcik untuk Efisiensi Alur Kerja Hermanto, Tino; Iswandi, Iswandi; Darianto, Darianto; Umroh, Bobby; Haniza, Haniza; Yolanda, Aginta
IRA Jurnal Pengabdian Kepada Masyarakat (IRAJPKM) Vol 3 No 3 (2025): Desember
Publisher : CV. IRA PUBLISHING

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56862/irajpkm.v3i3.372

Abstract

This Community Service activity was carried out at the Roti Pakcik Tanjung Morawa MSME through work process observations, discussions with the owner and workers, and recording the condition of the production facility. The activity focused on two fundamental needs of the MSME: improving the layout of the work area to enhance production efficiency and identifying the need for relevant production technology. The observation results showed a crowded work area, unclear functional zoning, and the movement of materials and products across the same area. These conditions increased waiting times, increased the risk of cross-contamination, and complicated quality control. In addition, the production process still relied on manual practices and limited tools, so there was a need for technology in the form of a flour sifting machine to maintain ingredient consistency, a mixer to maintain dough homogeneity according to production capacity, and a bread cutting machine to speed up the process, improve size uniformity, and reduce work fatigue. The activity resulted in a workflow problem map, an initial zoning design, and a list of technology priorities as a basis for further mentoring. These findings position the program as the initial stage of a realistic and field-based MSME production transformation.
Analisis Pengaruh Penggunaan LPG sebagai Bahan Bakar Alternatif terhadap Performansi dan Efisiensi Mesin Bensin Dinata, Irvan Hendrawan Surya; Jufrizal, Jufrizal; Darianto, Darianto; Hermanto, Tino; Umroh, Bobby; Nurdiana, Nurdiana
IRA Jurnal Teknik Mesin dan Aplikasinya (IRAJTMA) Vol 4 No 3 (2025): Desember
Publisher : CV. IRA PUBLISHING

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56862/irajtma.v4i3.260

Abstract

This study investigates the effect of using Liquefied Petroleum Gas (LPG) as an alternative fuel to Pertalite on the performance, energy efficiency, and operating cost of a 6.5 HP gasoline engine-driven water pump. Experiments were conducted at three engine operating conditions: minimum, average, and maximum engine speeds. The evaluated parameters included engine speed, water discharge, hydraulic power, shaft power, brake specific fuel consumption (BSFC), thermal efficiency, overall system efficiency, and fuel operating costs. The results indicate that the pump's hydraulic performance, as measured by water discharge and hydraulic power, is not significantly affected by the type of fuel used. However, engines that use Pertalite tend to have slightly better thermal and system efficiencies than LPG engines. From an economic perspective, LPG offers a substantial advantage, with lower operating and energy costs per unit of power. Therefore, despite Pertalite's slightly superior technical efficiency, LPG is a more economical alternative fuel for long-duration water pump applications.
Co-Authors Abdul Rahmansyah Achmad Jusuf Zulfikar Achmad Jusuf zulfikar Ahmad Marabdi Siregar Alfifto Amiruddin, Arfis Amrinsyah Amrinsyah Amrinsyah, Amrinsyah Amru Siregar Amru Siregar Azwir Sofyan Budi Harto Dadan Ramdan Danis Nainggolan Darianto Darianto Darianto Darianto Darianto, Darianto dedi kurniadi Dedi Kurniadi Dinata, Irvan Hendrawan Surya Eka Dewi Setia Tarigan Elapri, Bima Yoel Ellen Lumisar Panggabean Fadly A Kurniawan Fauji S, Ahmad Glusevic, Jean Haniza Harahap, Uun Novalia Harto, Budi INDRA HERMAWAN Iswandi Iswandi Iswandi Iswandi Jean Glusevic Jufrizal Jufrizal Jufrizal Jufrizal Kamaluddin Kurniawan, Fadly A Maulana, M Rizky Muhammad Idris Muhammad Idris Muhammad Yusuf Rahmansyah Siahaan Nainggolan, Danis Nurdiana Nurdiana Prawoto, Yogi Purba, Jepriadi Rahmansyah, Abdul Rahmatullah . Rinto Supardi Sipangkar Sarjana, SS Siagian, Martua Sangap Siahaan, Muhammad Yusuf Rahmansyah Sianturi, Danial Jack Marbis Sipangkar, Rinto Supardi Siti Alhamra Salqaura Siti Mardiana Sofyan, Azwir Tino Hermanto Tumangger, Theo Fredrik Yolanda, Aginta Yopan Rahmad Aldori Yuni Syahputri zulfikar zulfikar Zulfikar, Achmad Jusuf Zulfikar, Achmad Jusuf zulfikar, Achmad Jusuf zulfikar, zulfikar