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All Journal Jurnal Pendidikan Vokasi Jurnal Kompetensi Teknik Jurnal Pendidikan Teknik Mesin Rekayasa: Jurnal Penerapan Teknologi dan Pembelajaran Sainteknol : Jurnal Sains dan Teknologi Rekayasa Mesin R.E.M (Rekyasa Energi Manufaktur) Jurnal Jurnal Rekayasa Mesin Journal of Mechanical Engineering Learning JURNAL DINAMIKA VOKASIONAL TEKNIK MESIN SELAPARANG: Jurnal Pengabdian Masyarakat Berkemajuan International Journal of Mechanical Engineering Technologies and Applications (MECHTA) Jurnal Pendidikan Vokasi Otomotif Parta: Jurnal Pengabdian Kepada Masyarakat Panthera : Jurnal Ilmiah Pendidikan Sains dan Terapan Advance Sustainable Science, Engineering and Technology (ASSET) Jurnal Pendidikan Teknik Mesin Journal of Vocational and Career Education Jurnal Bahan Alam Terbarukan Jurnal Inovasi Mesin Journal of Mechanical Engineering Learning
Wirawan Sumbodo
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The Implementation of the Peer Teaching Learning Model Using the Demonstration Method to Improve Advanced Turning Skills Aprilian, Johan Andric; Sumbodo, Wirawan; Sutopo, Yeri
Journal of Vocational and Career Education Vol. 10 No. 2 (2025): December 2025
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jvce.v10i2.31288

Abstract

This study aims to determine the effect of the peer teaching model combined with the demonstration method on improving students’ skills in stepped turning (membubut bertingkat). The research was conducted on two groups: an experimental class using the peer teaching and demonstration approach, and a control class using conventional teaching methods. The research employed a quasi-experimental method with a pretest-posttest control group design. Data collection techniques included practical skill tests and documentation of student work. Data analysis was carried out using N-Gain scores and independent sample t-tests. The results showed that the experimental class achieved an average N-Gain of 79.02%, with most students falling into the “effective” category, while the control class reached an average of only 62.56%. The homogeneity test confirmed that the data variance was homogeneous. The t-test revealed a significance value of 0.000 < 0.05, indicating a statistically significant difference between the experimental and control groups. Thus, it can be concluded that the application of the peer teaching model with the demonstration method is significantly more effective in enhancing stepped turning skills than conventional teaching methods. This study recommends the implementation of collaborative and hands-on learning strategies in vocational technical education to improve practical competencies.
Effect of Firing Holding Time on Density, Porosity, and Hardness, Crucible Materials Based on Evaporation Boats Hidayat, Wakhid Muhlisin; Rusiyanto, Rusiyanto; Widodo, Rahmat Doni; Sumbodo, Wirawan; Fitriyana, Deni Fajar
International Journal of Mechanical Engineering Technologies and Applications Vol. 3 No. 2 (2022)
Publisher : Mechanical Engineering Department, Engineering Faculty, Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/MECHTA.2022.003.02.1

Abstract

Evaporation boats are conductive advanced ceramic composites with the best thermal evaporation source for metalizing applications. The short life time of the evaporation boats causes the metalizing industry to produce large amounts of evaporation boats waste. However, studies on the utilization of evaporation boat waste are still limited. Therefore, this study aims to determine the effect of firing holding time on the density, porosity, and hardness of crucible materials made from evaporation boats waste. The material used in this research is a mixture of evaporation boats waste powder, kaolin, and graphite, with a composition of 50%, 25% and 25%, respectively. During the mixing process, 15% of the water is added. The compacting process carried out with a compaction pressure of 25 MPa. The firing process is carried out at a temperature of 1000oC with holding times of 60, 90, 120, 150, and 180 minutes. The test results show that the holding time of firing has an effect on density, porosity, and hardness. The highest density value was 1,91 g/cm3 at a holding time of 180 minutes, and the lowest was 1,77 g/cm3 at a holding time of 60 minutes. The highest porosity value is 4,10% at a holding time of 60 minutes, and the lowest is 2,16% at a holding time of 180 minutes. The highest hardness value was 12,84 HV at a holding time of 180 minutes, and the lowest was 8,3 HV at a holding time of 60 minutes. The longer holding time in the firing process results in a decrease in the porosity content. The decrease in the porosity content results in an increase in density and hardness of the cruicible specimens.
Design and development of body electrical system and controller temperature control system for electric motorcycles Kurniawan, Aldi; Setiadi, Rizki; Sumbodo, Wirawan; Naryanto, Rizqi Fitri
Jurnal Inovasi Mesin Vol. 7 No. 1 (2025): APRIL 2025
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jim.v7i1.21246

Abstract

The rapid evolution of technology has transformed the automotive industry, transitioning from internal combustion engines to electric vehicles (EVs) to reduce greenhouse gas emissions and dependence on fossil fuels. This study focuses on developing a body electrical system for electric motorcycles by integrating components like lead-acid batteries, pulse-width modulation (PWM) controllers, waterproof DS18B20 temperature sensors, DC-DC converters, and energy-efficient LED lighting. The system is designed to comply with Indonesia’s National Standards (SNI). Employing the 4D research methodology (Define, Design, Develop, Disseminate), the electrical system underwent rigorous validation and testing. Results highlight enhanced performance, improved energy efficiency, and effective thermal management. The integration of a temperature control system reduced the risk of overheating, ensuring safety and operational reliability. This research contributes to advancing EV technology, offering a framework for optimizing body electrical systems for electric motorcycles in compliance with safety and performance standards
Blended learning model in Seafarers Training Program for level II technical expert based on the needs of the shipping industry Widiatmaka, F. Pambudi; Raharjo, Tri Joko; Sudana, I Made; Sumbodo, Wirawan; Setiadi, Rizki
Jurnal Pendidikan Vokasi Vol. 12 No. 3 (2022): November
Publisher : ADGVI & Graduate School of Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/jpv.v12i3.47823

Abstract

Nowadays, the Level II Technical Expert Seafarers' Training Program learning is conventional. This is burdensome for students due to the increased cost of living for students and needs to be revised. The coronavirus pandemic also limits direct learning. This article discusses the blended learning model for Seafarers Training Program for Level II Technical Experts. This research uses mixed methods. Quantitative methods are used to determine student responses to learning conditions. Student response data was taken using a questionnaire filled in by 41 students. Qualitative methods are used in finding the Blended Learning Model in the Level II Technical Seafarers Training Program Based on the needs of the Shipping Industry. In preparing the data model, the literature review includes blended learning, e-modules, and problem-based learning. The learning model is based on a literature review using the principles of education management. The descriptive analysis describes the model findings of Blended learning at Level II Technical Seafarers' Training. The findings in this article are that The MixPAM (Mixture Blended Problem-based And e-Module) model is a mixture of blended learning and problem-based learning e-module. The results show that the MixPAM model is hypothetically effective and efficient in improving student skills according to industry needs. Professional skills include ship engine repair maintenance (according to industry requirements), ship electrical, control, and ship management systems. Interpersonal skills include communication, teamwork, responsibility, and critical thinking.
Penerapan Teknologi Penyembelihan dan Pengulitan Sapi Pada Ponpes Az Zuhri Salafiyah Semarang Setiadi, Rizki; Sumbodo, Wirawan; Rokhman, Fathur; Sunyoto, Sunyoto; Zulfikar, Muhammad; Saputra, Luffy Eza; Yuniarsih, Tinna; Widodo, Rahmat Doni
Parta: Jurnal Pengabdian Kepada Masyarakat Vol. 5 No. 2 (2024)
Publisher : Universitas Pendidikan Nasional

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.38043/parta.v5i2.5520

Abstract

Kegiatan pengabdian kepada masyarakat ini bertujuan untuk menerapkan teknologi penyembelihan dan pengulitan hewan sapi qurban. Metode yang digunakan yaitu penyuluhan, demonstrasi, praktik langsung, dan pendampingan. Hasil yang dicapai dalam kegiatan ini alat penyembelihan memiliki spesifikasi teknis rangka dengan hollow disertai dengan motor hoist. Rangka bersifat portable yang dapat digunakan untuk merebahkan sapi sehingga saat penyembelihan sapi tidak memberontak dan lebih nyaman. Penyembelihan dan pengulitan hewan sapi qurban dapat digunakan pada sapi dengan beban berat maksimal sebesar 500 kg. Teknologi penyembelihan hewan kurban ini memiliki keunggulan yaitu lebih efisien, praktis, mudah dibawa, ergonomis dan higienis.
PENERAPAN TEKNOLOGI PEMOTONGAN HEWAN PADA USAHA SATE KAMBING “PUTRO WIDODO” SEMARANG Widodo, Rahmat Doni; Sumbodo, Wirawan; Sunyoto, Sunyoto
SELAPARANG: Jurnal Pengabdian Masyarakat Berkemajuan Vol 7, No 4 (2023): December
Publisher : Universitas Muhammadiyah Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31764/jpmb.v7i4.19909

Abstract

ABSTRAKKegiatan pengabdian ini merupakan keberlanjutan dari pengabdian yang sudah dilaksanakan pada mitra, yaitu usaha sate kambing “Putro Widodo” di Semarang, yang mempunyai masalah terkait proses pemotongan/penyembelihan kambing. Sate Widodo Sampangan Semarang tiap hari menyembelih rata-rata 6 ekor kambing. Proses penyembelihan dan pengambilan daging tiap ekor kambing membutuhkan waktu 1 jam karena dikerjakan tanpa bantuan alat yang memadai. Sebagai solusinya, tim pelaksana bersama mitra pengabdian akan merancang dan membuat alat bantu pemotongan kambing berupa meja khusus yang ergonomis yang menyatu dengan tiang gantungan kambing sebagai sarana menarik kulit kambing dan proses pemisahan daging dengan tulangnya menjadi mudah. Proses penarikan kulit nantinya dengan bantuan katrol penarik (hoist) dengan sumber tenaga motor listrik sehingga meringankan pekerja. Sebagai tim pelaksana kegiatan ini melibatkan dosen dan mahasiswa dengan bidang keahlian yang sesuai dengan kebutuhan lapangan. Dalam pembuatan mesin/alat yang akan diterapkan di mitra akan dilaksanakan di workshop jurusan Teknik Mesin FT Unnes, dengan melibatkan teknisi dan mahasiswa. Metode pengabdian ini yaitu: 1) Penyuluhan, 2) Demontrasi, 3) Praktik Langsung, dan 4) Pendampingan. Pelaksanaan pengabdian dilakukan pada saat hari raya Idul Adha 1444 H di salah satu kompleks perumahan di Kota Semarang. Kelayakan desain alat mendapatkan skor presentase sebesar 83,1% yang dapat diartikan bahwa desain alat bantu penyembelihan dan pengulitan kambing sangat layak untuk digunakan. Efektivitas dan efisiensi alat bantu penyembelihan dan pengulitan kambing mendapat skor sebesar 82,5% yang dapat disimpulkan bahwa alat bantu penyembelihan dan pengulitan kambing sangat efektif dan efisien. Dan aspek ergonomi mendapat skor 85% yang dapat diartikan alat bantu penyembelihan dan pengulitan kambing ini sangat ergonomis. Kata kunci: kambing; pengulitan; penyembelihan; teknologi ABSTRACTThis service activity is a continuation of the service that has been carried out with partners, namely the goat satay business "Putro Widodo" in Semarang, which has problems related to the goat slaughtering and slaughtering process. Sate Widodo Sampangan Semarang slaughters an average of six goats every day. The process of slaughtering and taking the meat from each goat takes 1 hour because it is done without the help of adequate tools. As a solution, the implementing team, together with service partners, will design and make a goat slaughtering tool in the form of a special ergonomic table that is integrated with the goat gallows as a means of pulling the goat skin and making the process of separating the meat from the bones easy. The process of pulling the skin will be done with the help of a pulley (hoist) with an electric motor power source, thereby making it easier for workers. As a team implementing this activity, it involves lecturers and students with areas of expertise that suit the needs of the field. The manufacture of machines and tools that will be implemented by partners will be carried out in the Mechanical Engineering department workshop at FT Unnes, involving technicians and students. The methods of this service are: 1) counseling, 2) demonstration, 3) direct practice, and 4) mentoring. The dedication was carried out during the Idul Adha 1444 H holiday in one of the housing complexes in Semarang City. The feasibility of the tool design received a percentage score of 83.1%, which means that the design of the tool for slaughtering and skinning goats is very suitable for use. The effectiveness and efficiency of goat slaughtering and skinning aids received a score of 82.5%, indicating that goat slaughtering and skinning aids are very effective and efficient. And the ergonomics aspect received a score of 85%, which means that this goat slaughtering and skinning aid is very ergonomic. Keywords: goat; skinning; slaughter; technology.
Influence of Mixing Time on the Hardness and Structure of Local Clay-Based Crucibles Rusiyanto; Rifky Ismail; Athanasius Priharyoto Bayuseno; Daffa Agya Mahardika; Fitriyana, Deni Fajar; Wirawan Sumbodo; Aldias Bahatmaka
Advance Sustainable Science Engineering and Technology Vol. 8 No. 1 (2026): November - January
Publisher : Science and Technology Research Centre Universitas PGRI Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26877/asset.v8i1.2314

Abstract

Although clay crucibles are frequently utilized in regional industries, their inadequate mechanical strength often causes durability issues. This study investigates the influence of mixing duration on the Vickers hardness and macrostructure of crucibles composed of local clay, kaolin, and molasses. The composition was made up of 47.5% clay, 47.5% kaolin, and 5% molasses as a binder, with 15% water added relative to the total weight. Durations of 15, 30, and 45 minutes were evaluated to determine their impact on material qualities. The findings indicated a positive relationship between mixing duration and hardness. At 15 minutes, the mean hardness was 4.1 HV, which escalated to 8.5 HV at 30 minutes and 12.4 HV at 45 minutes. The increased hardness with extended mixing durations indicates a more homogeneous particle dispersion and enhanced bonding among the raw ingredients. The findings suggest that increasing the mixing time can elevate the quality and longevity of locally manufactured crucibles, rendering them more appropriate for small-scale metallurgical applications.
Analysis on The Effect of Bio-addictive Mixtures Eugenol in Pertamax Green 95 Fuel on Engine Performance Nursiam, Kuat; Sonika Maulana; Sumbodo, Wirawan; Naryanto, Rizqi Fitri; Fitriyana, Deni Fajar
Jurnal Bahan Alam Terbarukan Vol. 14 No. 2 (2025): December 2025 [Nationally Accredited Sinta 3]
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jbat.v14i2.40034

Abstract

Improving energy efficiency and reducing exhaust emissions from motor vehicles have become a primary focus in the transition towards green energy in the transportation sector. This study aims to analyze the effect of adding eugenol, the main compound in clove oil, to Pertamax Green fuel on engine performance, fuel consumption efficiency, and exhaust emissions in a 2018 Honda Vario 125 motorcycle. The research method is an experimental approach with variations in the fuel mixture of pure Pertamax Green (P0), Pertamax Green + 0.2% eugenol (P1), 0.5% eugenol (P2), and 1% eugenol (P3). Testing was conducted using a dynamometer to measure torque and power, a static method for fuel consumption, and a gas analyzer to analyze CO and HC emission levels. The results showed that adding eugenol generally improved engine torque and power. The P2 mixture (0.5% eugenol) produced the highest torque of 8.48 N.m at 5000 rpm and maximum power of 7.2 HP at 8000 rpm, an increase of 38% and 18%, respectively, compared to pure Pertamax Green. Fuel consumption efficiency also increased by 4.1% with the P2 mixture, while excessive eugenol (1%) decreased efficiency due to slower combustion. In terms of emissions, CO levels decreased by up to 16.7%, and HC levels reduced by up to 22.54% as the concentration of eugenol increased.
Co-Authors - Ramelan Ahmad Fauzi Aldias Bahatmaka Ali Subkhi, Ali Allam, Tri Syamsul Aprilian, Johan Andric Ari Dwi Nur Indriawan M. Asri, Sarwi Athanasius Priharyoto Bayuseno Azas Ramang Pambudi, Azas Budiarso Eko Budiman, Febrian Arif Cahyanto, Septian Eko Citra Satria P, Citra Daffa Agya Mahardika Dony Hidayat Al janan, Dony fajar, syahwal Fajri, Novila Rojabni Farokhi, Mohammad Farokhi, Mohammad Fathur Rokhman Fitriyana, Deni Fajar Heri Yudiono Hidayat, Wakhid Muhlisin Hintan Purnama, Ahmad Ridwan Hintan Purnama, Ahmad Ridwan I Made Sudana Isyrouddin, Faishol Aziz Isyrouddin Aziz Khakim, Faisal Khumaedi, Muhammad Kriswanto Kriswanto Kriswanto, Kriswanto Kurniawan, Aldi Kusnanto , Wawan  M. Nuril Anwar Habiby Mizani Yunistyar Santoso, Mizani Yunistyar Muhammad Khumaedi Muhammad Zulfikar Mujahid, Ma'ruf Murdani . Murdani Murdani, Murdani Musyono, Ari Dwi Nur Indriawan Nashiruddin, Ahmad Syafiq Nurrohmah, Sinta Indiarti Nursiam, Kuat Pramono Pramono Pramono, Pramono Prasetya, Deni Bagus Rahmadhi, Arif Ramelan Ramelan Riendy Wardhana, Riendy Rifa'i, Muhammad Arifian Rifky Ismail Rizki Setiadi Rizkiawan, Dedy Rizqi Fitri Naryanto Rusiyanto Rusiyanto Rusiyanto, Rusiyanto Salim Salim Saputra, Luffy Eza Saputro, Fathony Nada Setiadi, Rizki Soesanto -, Soesanto Sonika Maulana Sulestiyawan, Muhammad Sunyoto Sunyoto Suratno Margo Sulistyo Suwahyo - Tri Joko Raharjo Utomo, M. Arif Setyo Wahyu Widiyanto Wawan  Kusnanto  Widiantoro, Ana Wilda Widiantoro, Ana Wilda Widiatmaka, F. Pambudi Widya Aryadi Yeri Sutopo Yosi Ramadhan, Yosi yuniarsih, tinna