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All Journal Jurnal Ilmiah Teknik Mesin Mimbar Ilmu JURNAL CRANKSHAFT Scientific Journal of Mechanical Engineering Kinematika ARMATUR : Artikel Teknik Mesin dan Manufaktur AMMA : Jurnal Pengabdian Masyarakat
ALDO, JEFRI
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Aerospace Engineering Humanities Automotive Engineering Chemistry Control & Systems Engineering Education Energy Engineering Industrial & Manufacturing Engineering Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Mechanical Engineering Nursing

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ANALISIS KEGAGALAN PADA PROSES PEMOTONGAN MATERIAL MENGGUNAKAN MESIN TRULASER 5040 Kurniawan, Sandi; Aldo, Jefri; Hariyono, Hariyono
ARMATUR : Artikel Teknik Mesin & Manufaktur Vol. 4 No. 2 (2023): Jurnal Armatur
Publisher : Universitas Muhammadiyah Metro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24127/armatur.v4i2.3932

Abstract

The material-cutting process is one of the critical stages in the manufacturing industry that can affect the quality and success of the final product. The TruLaser 5040 machine is a material-cutting machine that is often used in industry to cut various types of materials with high precision. However, even though this machine has been well designed, failures sometimes occur in the cutting process which results in defects in the material being processed. This study aims to analyze the failures that occur in the material-cutting process using the TruLaser 5040 machine. This research uses a qualitative approach with a descriptive research type and the research informants are machine operators. This study has several stages which include data collection through direct observation, interviews, and descriptive analysis of the collected data. The results of the research conducted found several factors causing failure in the material cutting process including human error, machine error, material error, cutting size error, and cutting defects. Things that can be done to avoid material cutting failures are ensuring the condition of the machine and its main components such as nozzles, protective glass, and so on are in good condition. Material conditions must also be adjusted to the cutting parameters on the machine which include cutting distance, tip diameter, current, gas pressure, and cutting speed so that dross and defects do not occur in the cutting material.
Rancang Bangun Toolbox Untuk Unit STH Service Truck Di Pt Jhonlin Baratama Menggunakan Mesin Trulaser 5040 Kurnawan, Sandi; Aldo, Jefri
Jurnal Ilmiah Teknik Mesin Vol 12 No 1 (2024): JURNAL ILMIAH TEKNIK MESIN
Publisher : Universitas Islam 45 Bekasi, Fakultas Teknik, Jurusan Teknik Mesin

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33558/jitm.v12i1.8157

Abstract

Rancang bangun toolbox untuk Unit STH service truck di PT Jhonlin Baratama bertujuan untuk meningkatkan efisiensi dan efektivitas dalam tugas pemeliharaan dan perawatan peralatan tambang. Toolbox ini akan menyediakan ruang penyimpanan yang aman, terorganisir, dan mudah diakses untuk alat-alat dan perlengkapan yang diperlukan. Langkah-langkah dalam rancang bangun toolbox ini meliputi identifikasi kebutuhan, studi pustaka, desain konseptual, detail desain, perencanaan komponen mekanik, fabrikasi, assembly, finishing, dan uji coba. Proses identifikasi kebutuhan, alat-alat dan perlengkapan yang diperlukan dalam tugas pemeliharaan dan perawatan ditentukan, sedangkan desain konseptual akan menggambarkan sketsa toolbox dengan kompartemen penyimpanan yang sesuai. perencanaan komponen mekanik dilakukan untuk memastikan kekuatan dan kestabilan toolbox saat digunakan dan untuk menentukan material yang sesuai dengan kondisi lingkungan pertambangan. Detail desain melibatkan penentuan dimensi, jumlah laci, sambungan, dan sistem penguncian yang sesuai. Uji coba dilakukan untuk memastikan fungsionalitas dan kekuatan toolbox sesuai dengan kebutuhan. Toolbox yang di buat terbukti dapat membantu teknisi atau operator saat melakukan pemeliharaan dan perawatan peralatan tambang sehingga pekerjaan yang dilakukan menjadi lebih efektif dan efisien. Dengan adanya toolbox ini pekerjaan teknisi menjadi lebih ringan dan terorganisir dengan baik karena tidak harus mengeluarkan dan memasukan peralatan yang di butuhkan ketika akan melakukan pemeliharaan dan perawatan peralatan tambang. Desain bagian bawah toolbox yang dapat menampung air bersih juga menjadi inovasi yang dapat membantu teknisi untuk menjamin kebersihan peralatan yang digunakan sehingga dapat memperpanjang usia peralatan tersebut.
Rancang Bangun Alat Pengupas Serabut Kelapa Menggunakan Metode VDI 2222 Aldo, Jefri; Kurniawan, Sandi
Jurnal Ilmiah Teknik Mesin Vol 12 No 2 (2024): JURNAL ILMIAH TEKNIK MESIN
Publisher : Universitas Islam 45 Bekasi, Fakultas Teknik, Jurusan Teknik Mesin

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33558/jitm.v12i2.9904

Abstract

Penelitian ini bertujuan mendeskripsikan cara merancang alat pengupas serabut kelapa, mengetahui proses pembuatan alat pengupas serabut kelapa, mengetahui kinerja alat pengupas serabut kelapa. Metode perancangan produk yang akan digunakan adalah metode perancangan sesuai VDI 2222 (Gerhard Pahl dan Wolfgang Beitz dalam bukunya Engineering Design: A Systematic Approach). Tahapan-tahapannya yaitu tahapan merencana, mengkonsep, merancang, dan penyelesaian. Pada proses pengupasan kelapa menggunakan parang waktu dibutuhkan untuk mengupas 10 buah kelapa yaitu15 menit, sedangkan menggunakan alat pengupas serabut kelapa waktu yang digunakan untuk mengupas 10 buah kelapa yaitu 12 menit. Perancangan desain yang dilakukan untuk mengetahui bentuk, bahan dan sistem kerja alat apakah sudah sesuai dengan yang diinginkan. Pada proses perakitan yang dilakukan harus memerhatikan bagian mana yang ingin dirakit terlebih dahulu seperti memulai dengan membuat bagian dudukan, penopang, mata pisau, pedal lalu pegas. Setelah dilakukan 20 kali pengujian dan perbandingan yaitu 10 kali menggunakan parang dan 10 kali menggunakan alat pengupas serabut kelapa, penulis menyatakan bahwa rata-rata waktu yang digunakan pada proses pengupasan serabut pada 1 buah kelapa menggunakan alat pengupas serabut kelapa yaitu ± 1,2 menit tergantung pada kekuatan dan kecepatan operator pada saat menggunakan alat pengupas serabut kelapa serta memerlukan 5-7 kali penusukan pada serabut kelapa namun tergantung pada tingkat kekerasan serabut kelapa tersebut.
Pemanfaatan TIK Dalam Pembuatan Dokumen Pendukung Untuk Melamar Pekerjaan Pasca Kelulusan Siswa SMK Di Kab. Tanah Bumbu Surya Rahmany, Rijal; Christandi Batubara, Yongki; Made Ivan Wiyarta Cakra Sujana, I; Gunawan, Gad; Mungil Kurniawati, Diniar; Qalbi AM, Chaerul; Aldo, Jefri; Hariz Dedy Sayogi, Muhammad
AMMA : Jurnal Pengabdian Masyarakat Vol. 3 No. 11 : Desember (2024): AMMA : Jurnal Pengabdian Masyarakat
Publisher : CV. Multi Kreasi Media

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

Abstract

Vocational high school (SMK) students represent a level of vocational secondary education expected to fulfill the demand for technical labor at specific levels within the industry. However, current SMK graduates face challenges due to intense competition in securing employment. This community service initiative aims to enhance the skills of SMK students by focusing on the utilization of Information and Communication Technology (ICT) in the preparation of post-graduation documents. A case study was conducted at a private vocational high school (SMKS) in and state vocational high school (SMKN) in Tanah Bumbu Regency as an effort to prepare students to face the challenges of Industry 4.0. Through outreach activities, this initiative introduced the concept of community service and the benefits of ICT in document preparation. The methods employed aimed to achieve outcomes such as improving students' skills, applying ICT in preparing supporting documents for job applications, and enhancing students' competitiveness in the labor market. The results of the activities carried out showed an increase in participants' knowledge of curriculum vitae and job application letters. Survey results also indicated that the seminar was highly beneficial for participants in this community service activity through technical outreach.
The Role of Mediation of Work Motivation in Determining Working Readiness of Vocational School Students Galih Rakasiwi, Putra; Sukardi, Thomas; Indra, Muhammad; Aldo, Jefri
Mimbar Ilmu Vol. 28 No. 3 (2023): December
Publisher : Universitas Pendidikan Ganesha

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23887/mi.v28i3.65109

Abstract

The competency of vocational high school students is still said to be lacking in work readiness. This is caused by a lack of encouragement for oneself, family, school facilities, school environment, etc. This research aims to analyze the mediating role of work motivation in determining vocational school students' work readiness. This research uses an ex-post facto quantitative approach with the path analysis method. Research subjects in 3 vocational schools in machining engineering expertise in class XII with a total sample of 193 people. Data collection uses questionnaires, interviews, and documentation. Hypothesis testing in this study used SmartPLS 3 software. The findings show that work competency and industrial work practice experience can influence work motivation. Work motivation can directly influence students' work readiness. Indirectly, work competency affects work motivation through work readiness. Indirectly, industrial work practice experience affects work motivation through work readiness. It was concluded that work motivation plays a role in determining vocational school students' work readiness, especially in class XII machining engineering, followed by work competency and industrial work practice experience. So it is recommended to the vocational school community always to be motivated so that students are ready to work, have sufficient competence and experience, and always pay attention to the 3 things researchers discovered and discussed because vocational schools aim to work, continue, and become self-employed.
Pemodelan dan Analisa Respon Dinamis Impeller Pompa Sentrifugal Akibat Perbedaan Tekanan Hisap dan Tekanan Buang Dedy Sayogi, Muhammad Hariz; Apriandi, Riyki; Aldo, Jefri; Rahmany, Rijal Surya
JURNAL CRANKSHAFT Vol 8, No 1 (2025): Jurnal Crankshaft Vol.8 No.1 (2025)
Publisher : Universitas Muria Kudus

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24176/cra.v8i1.14045

Abstract

Pada penelitian ini dilakukan simulasi karakteristik respon dinamis impeller pompa sentrifugal dengan tegangan input 250 V dengan perbedaan tekanan fluida pada suction inlet dan discharge outlet. Terdapat tiga parameter respon dinamis impeller yang diamati yaitu perpindahan, kecepatan sudut dan percepatan sudut. Respon dinamis perpindahan impeler dianalisis dengan mensimulasikan interval waktu dari 0 detik hingga 10 detik. kondisi pertama puncak kecepatan sudut sekitar 0,1 rad/s lebih rendah dibandingkan kondisi kedua (sekitar 0,3 rad/s). Tanda negatif hanya menunjukkan amplitudo gelombang. Antara 1,02 detik hingga 1,04 detik, puncak kecepatan sudut pada kondisi pertama adalah sekitar 0,1 rad/s, sementara pada kondisi kedua sekitar 0,2 rad/s, kondisi pertama dengan tekanan lebih rendah di inlet dan outlet membutuhkan kecepatan sudut lebih kecil (2,8 rad/s) dibandingkan kondisi kedua dengan tekanan lebih tinggi, yang memerlukan kecepatan sudut sedikit lebih tinggi (2,77 rad/s) pada waktu yang sama. Respons dinamis percepatan sudut impeler dianalisis pada kondisi awal dan keadaan stabil. Pada kondisi tunak, yang diambil antara 14,07 detik hingga 14,08 detik, kondisi pertama menunjukkan percepatan sudut lebih kecil (sekitar 100 rad/s²) dibandingkan dengan kondisi kedua, yang memerlukan percepatan sudut lebih tinggi (sekitar 240 rad/s²). Secara keseluruhan, kondisi dengan tekanan lebih tinggi di inlet dan outlet (kondisi kedua) memerlukan percepatan sudut yang lebih besar dibandingkan dengan kondisi pertama pada waktu yang sama.Kata kunci:  pompa sentrifugal, simulasi, analisis
PENGARUH FRAKSI VOLUME DAN ARAH SERAT TERHADAP KETANGGUHAN IMPAK DAN KEKUATAN BENDING PADA MATERIAL KOMPOSIT SERAT TANDAN KOSONG KELAPA SAWIT Sunardi; Pinem, Mekro Permana; Aldo, Jefri
Scientific Journal of Mechanical Engineering Kinematika Vol 10 No 2 (2025): SJME Kinematika Desember 2025
Publisher : Mechanical Engineering Department, Faculty of Engineering, Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/sjmekinematika.v10i2.747

Abstract

Natural fiber-based composite materials are becoming an environmentally friendly alternative that continues to be developed due to their abundant availability, light weight, and low production costs. This study aims to determine the effect of volume fraction and fiber direction on the mechanical properties of empty oil palm fruit bunch (OPEFB) fiber-based composites, particularly impact toughness and flexural strength. The composite manufacturing process was carried out experimentally using hand lay-up and compression molding methods. OPEFB fibers were used as reinforcement and polyester resin as matrix, with the addition of MEKPO catalyst at 1% of the resin volume. Composites were varied based on fiber volume fraction (20%, 30%, and 40%) and fiber direction (0°, 45°, and 90°). Impact toughness testing was carried out using the Izod method referring to ASTM D256, while flexural strength was tested using the three-point bending method (ASTM D790). The results showed that a 30% volume fraction with a 0° fiber direction produced the highest flexural strength of 95.7 MPa, while a 40% volume fraction with a 45° direction showed the highest impact toughness of 28.1 kJ/m². Increasing the fiber volume fraction above 30% decreased the flexural strength due to fiber agglomeration. The 0° fiber direction was optimal for flexure, while 45° was most effective for absorbing impact energy.
Co-Authors Apriandi, Riyki Christandi Batubara, Yongki Gad Gunawan Galih Rakasiwi, Putra Hariyono, Hariyono Hariz Dedy Sayogi, Muhammad Kurnawan, Sandi Mekro Permana Pinem, Mekro Permana MUHAMMAD INDRA Mungil Kurniawati, Diniar Qalbi AM, Chaerul Rijal Surya Rahmany SANDI KURNIAWAN Sujana, I Made Ivan Wiyarta Cakra Sunardi Thomas Sukardi