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Timotius Anggit Kristiawan
Politeknik Negeri Semarang
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The Influence Of Using A Sleeve Machine On The Production Cost Of Brake Shoe Products In The Die Casting Department Of PT XYZ Kristiawan, Timotius Anggit; Wibowo, Andryana Dwiandara; Setiyawan, Trio; Indrawati, Ragil Tri
Journal of Mechanical Engineering and Applied Technology Vol. 2 No. 1 (2024): VOLUME 2 ISSUE 1 YEAR 2024 (MARCH 2024)
Publisher : Politeknik Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/jmeat.v2i1.5475

Abstract

The process of finishing brake shoe products in PT XYZ's die casting department experienced waste using M steel shot 230 sand which reached 4,125 kg throughout 2020 and the amount of sand that fell to the floor was 36 kg per shift. The reason is that the unloading process is still manual by shaking the brake shoe jig for 2 seconds/jig then immediately pouring the brake shoe into the polybox which has holes and does not have a sand container. The use of a sieving machine is expected to reduce lost sand so that productivity can increase. The test parameters are the rotation of the motor which is regulated through an inverter of 5.5 Hz, 6 Hz, and 6.5 Hz for the time of the brake shoe sifting process, as well as the amount of sand scattered and carried by the brake shoe against the cost of purchasing sand. The results showed that productivity increased by 5.56%, the cost down of purchasing sand by up to 75.40%, and environmental cleanliness increased by 92.87%. The increase above based on Pareto analysis is included in the significant category because it meets the 20/80 rule.
Mass Ratio Influence on Vortex-Induced Vibration of a Flexible Cylinder using Large Eddy Simulation at Re=1000 An-Nizhami, Avicenna; Apriandi, Nanang; Setiawan, Trio; Kristiawan, Timotius Anggit; Riadini, Elfrida Rizky; Janitra, Atikah Ayu; Yanuar, Padang
Journal of Mechanical Engineering and Applied Technology Vol. 2 No. 1 (2024): VOLUME 2 ISSUE 1 YEAR 2024 (MARCH 2024)
Publisher : Politeknik Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/jmeat.v2i1.5498

Abstract

The study investigates the phenomenon of vortex-induced vibration (VIV) using Large Eddy Simulation (LES) at a Reynolds number of 1000, focusing on transitional flow conditions. LES has proven effective in understanding VIV across Reynolds number regimes, aiding in comprehending flow physics and mechanisms behind VIV. The research aims to contribute data for validating numerical models and informing engineering practices. The study employs the Navier-Stokes equation and the continuity equation to analyze fluid flow, treating it as incompressible due to negligible density changes. The three-dimensional incompressible momentum equation is discretized using the finite volume method within the spatial domain. Resolution of the pressure Poisson equation ensures compliance with free divergence conditions, enhancing computational fluid dynamics simulations' reliability. Validation of the fluid flow solver involves comparing computed drag force coefficients with established benchmarks, showing agreement within small discrepancies. The study delves into vibration behavior induced by cross flow at various reduced velocities (), noting distinct patterns ranging from irregularities at low  to quasi-periodic behavior at higher values. Analysis of maximum cylinder displacement () across different reduced velocities and mass ratios underscores the complex relationship between system parameters and displacement dynamics. A consistent occurrence of y_max at a specific reduced velocity highlights its significance, while varying mass ratios affect displacement patterns, indicating the importance of understanding these dynamics for optimizing fluid-structure interaction systems.
DESAIN DAN PEMBUATAN MESIN FILAMEN PRINTER 3D METODE EXTUDER BERBAHAN LIMBAH BOTOL PLASTIK Setiyawan, Trio; Wattimena, Riles Melvy; Kristiawan, Timotius Anggit; Irianto, Sugeng; Hidayati, Nur
Journal of Mechanical Engineering and Applied Technology Vol. 2 No. 3 (2024): VOLUME 2 ISSUE 3 YEAR 2024 (NOVEMBER 2024)
Publisher : Politeknik Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/jmeat.v2i3.6114

Abstract

Banyaknya minuman kemasan yang menggunakan botol plastik berdampak pula pada limbah sampah yang berupa botol plastik, dengan banyaknya limbah botol plastik memungkinkan untuk dimanfaat menjadi barang yang berguna yaitu salah satunya dengan mengubah limbah botol plastik menjadi fillamen printer 3D dalam proses perubahan dari botol plastik menjadi fillamen dibutuhkan mesin pembuat fillamen dengan motode extruder. Proses pembuatan mesin fillamen ini dilakukan dengan tahapan penelitian ini yaitu identifikasi masalah, perumusan masalah, sintesis analisis, evaluasi dan presentasi. dari keseluruhan proses desain dan pembuatan mesin fillamen printer 3D motede extruder berbahan botol plastik memiliki spesifikasi dimensi Panjang mesin 1600 mm dengan lebar 300 mm kontrol menggunakan Arduino, penggerak ektruder menggunakan stepper motor Nema 34, penggerak penggulung fillamen menggunakan stepper motor Nema 23, menggunakan 4 pemanas dan filamen yang dihasilkan memiliki diameter 1.75 mm. Ditahapan evaluasi Mesin fillamen printer 3D motede extruder dilakukan pengujian menggunakan 2 macam variabel yaitu variabel tetap dan bebas.Variabel tetap pada penelitian ini yaitu menggunakan suhu (195℃, 220℃ dan 250℃). Variabel bebas yang digunakan adalah kecepatan putar (66 RPM dan 80 RPM) Hasil penelitian menunjukkan bahwa, pada uji coba lapangan di dapat filament diameter homogen berdiameter 1,75 mm, warna tidak gosong, tekstur tidak kasar dan berbintik hitam. Dengan parameter terbaik kecepatan screw 80 RPM dan suhu pemanasan 220 °C menggunakan variabel pendingin 2 buah kipas. Mampu menghasilkan kapasitas keluaran mesin extruder filament 3D Printing adalah 2.079 𝑘𝑔/𝑗𝑎𝑚
Front Matter Journal of Mechanical Engineering and Applied Technology, 2 (3) November 2024 Kristiawan, Timotius Anggit
Journal of Mechanical Engineering and Applied Technology Vol. 2 No. 3 (2024): VOLUME 2 ISSUE 3 YEAR 2024 (NOVEMBER 2024)
Publisher : Politeknik Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/jmeat.v2i3.6140

Abstract

Back Matter Journal of Mechanical Engineering and Applied Technology, 2 (3) November 2024 Kristiawan, Timotius Anggit
Journal of Mechanical Engineering and Applied Technology Vol. 2 No. 3 (2024): VOLUME 2 ISSUE 3 YEAR 2024 (NOVEMBER 2024)
Publisher : Politeknik Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/jmeat.v2i3.6141

Abstract

RANCANG BANGUN MESIN PENGOLAH PUPUK ORGANIK GRANULAR MENGGUNAKAN SISTEM ROTARY DAN PENYEMPROTAN OTOMATIS DENGAN KAPASITAS 10 KG/JAM Putranto, Kristian Vico; Kristiawan, Timotius Anggit; Hakeke, Yarul; Saputra, Hafiidh; Sya’roni, Mohammad; Melvy Wattimena, Riles; Irianto, Sugeng; Hidayati, Nur
Journal of Mechanical Engineering and Applied Technology Vol. 3 No. 1 (2025): VOLUME 3 ISSUE 1 YEAR 2025 (MARCH 2025)
Publisher : Politeknik Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/jmeat.v3i1.6488

Abstract

Pupuk organik granul merupakan pupuk yang sebagian atau seluruhnya berasal dari bahan – bahan organik yang berbentuk butiran padat. Di bidang pertanian pupuk organik granul sangat diperlukan keberadaannya karena kualitas pupuk granul dapat menambah tingkat kesuburan tanah. Tujuan dari tugas akhir ini adalah merancang dan membangun Mesin Pengolah Pupuk Organik Granular dan melakukan uji kinerja pada mesin tersebut. Tahapan untuk metode ini yaitu mengidentifikasi kebutuhan, perumusan masalah, sintesis, analisis dan optimalisasi, evaluasi dan presentasi. Mesin ini dirancang dengan sistem rotary untuk memutar pupuk organik yang bercampur dengan cairan perekat yang disemprotkan secara otomatis dan penggerak motor listrik 1HP dengan kapasitas 10 kg/jam dalam sekali proses granulasi serta mudah dalam pengoperasian yang hanya memasukkan pupuk organik ke dalam pengaduk dan menekan tombol ON/OFF untuk memutarkan pengaduk maupun untuk mengaktifkan penyemprotan otomatisnya
Front Matter Journal of Mechanical Engineering and Applied Technology, 3 (2) July 2025 Kristiawan, Timotius Anggit
Journal of Mechanical Engineering and Applied Technology Vol. 3 No. 2 (2025): VOLUME 3 ISSUE 2 YEAR 2025 (JULY 2025)
Publisher : Politeknik Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/jmeat.v3i2.6560

Abstract

Back Matter Journal of Mechanical Engineering and Applied Technology, 3 (2) July 2025 Kristiawan, Timotius Anggit
Journal of Mechanical Engineering and Applied Technology Vol. 3 No. 2 (2025): VOLUME 3 ISSUE 2 YEAR 2025 (JULY 2025)
Publisher : Politeknik Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/jmeat.v3i2.6561

Abstract

ANALISIS DAMPAK IMPLEMENTASI MESIN FIRMWARE UPLOADING DENGAN KAPASITAS 60 INTEGRATED CIRCUIT PERMENIT PADA PERUSAHAAN IC CARD Rachman, Fathur; Kristiawan, Timotius Anggit; Putri, Farika Tono
Journal of Mechanical Engineering and Applied Technology Vol. 3 No. 2 (2025): VOLUME 3 ISSUE 2 YEAR 2025 (JULY 2025)
Publisher : Politeknik Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/jmeat.v3i2.6637

Abstract

The IC Card (IC Card) manufacturing industry still widely relies on manual methods for firmware uploading into integrated circuits, a process that involves contract labor and basic tools. This method poses several limitations including low throughput, high labor dependency, and a significant risk of human error. These issues affect overall efficiency, product quality, and operational cost. The gap identified lies in the lack of automation in the firmware uploading process, especially within local industries. To address this, the present study aims to evaluate the impact of implementing an automated Firmware Uploading Machine with a capacity of 60 integrated circuits per minute. The research methodology includes a combination of engineering design and field performance testing. The proposed system employs servo motor technology, fiber optic sensors, and PLC-based control to replace manual handling. Experimental results indicate a six-fold increase in production capacity, substantial reductions in labor requirements, and improved operational efficiency. Furthermore, a Break-even point (BEP) analysis confirms that the return on investment can be achieved in a relatively short time. In conclusion, the automated firmware uploading system offers a practical solution for improving productivity, lowering operational costs, and enabling the industrial transition towards high-efficiency and smart manufacturing environments. Keywords: Automation; BEP; efficiency; firmware uploading; integrated circuit
MODIFIKASI SISTEM OTOMASI PADA SLIDING HOOD GUNA MENINGKATKAN EFISIENSI KERJA DAN MEMPERBAIKI NILAI ERGONOMI BAGI OPERATOR CNC CUTTING DI PT XYZ Kristiawan, Timotius Anggit; Sugiono, Friska Ayu Fitrianti; Amin, Faiz Sholihul; Bistolen, Boy
Journal of Mechanical Engineering and Applied Technology Vol. 3 No. 3 (2025): VOLUME 3 ISSUE 3 YEAR 2025 (NOVEMBER 2025)
Publisher : Politeknik Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/jmeat.v3i3.7067

Abstract

The CNC cutting process at PT XYZ produces emissions and heat controlled by a sliding hood. However, its manual operation—requiring operators to push a 69.65 kg device up to 30 times daily—creates fatigue, discomfort, and low tool utilization. This highlights a gap where automation is often applied for efficiency but rarely combined with ergonomic improvements. This study aims to develop and test an automated sliding hood to increase efficiency and reduce ergonomic risks. The Shigley-Mitchell design methodology was applied, supported by observation, interviews, and performance testing before and after modification. Key indicators measured were cycle time, tool effectiveness, and ergonomic risk using the RULA method. Results showed a decrease in cycle time from 57.28 to 46.65 seconds (18.6% efficiency gain). Tool effectiveness rose from 27 to 44 successful operations out of 45, while RULA scores improved from 7 (high risk) to 3 (low risk), indicating a 58% ergonomic improvement. In conclusion, automating the sliding hood enhanced work efficiency, optimized equipment use, and improved ergonomic conditions. This demonstrates the value of integrating automation with ergonomic design to achieve productivity and health benefits in manufacturing.
Co-Authors Abdul Syukur Alfauzi Achmad, Fariz Ahmad Dimas Alisyafa'at Ahmad Mamba'udin Alfiando Satrio Wibowo Alisyafa’at, Ahmad Dhimas Amin, Faiz Sholihul Aminuyati An Nizhami, Avicenna Ardjo, Anwar Sukito Arif Hidayat Aulia, Nur Fatowil Bambang Tjahjono Boy Bistolen Budhi Prasetiyo Dwiana Hendrawati Elfrida Rizky Riadini Faza, Muhajid Syafiulhaq Hakeke, Yarul Hery Tristijanto Ignatius Gunawan Widodo Ignatius Gunawan Widodo Indrawati, Ragil Tri Irianto, Sugeng Janitra, Atikah Ayu Karuana, Muhammad Rienaldy Melvy Wattimena, Riles Mulyono Mulyono Nanang Apriandi Nizami, Avicenna An Nur Hidayati Nurhidayati Nurhidayati Padang Yanuar Padang Yanuar Panji Setya Laksono Putranto, Kristian Vico Putri, Farika Tono Rachman, Fathur Rani Raharjanti Riles Melvy Wattimena Riles Melvy Wattimena Rizal Ma’ruf Rochmatika, Rizkha Ajeng Safriana, Eni Saputra, Hafiidh Satito, Aryo Setiawan, Trio Setiyawan, Trio Sri Harmanto Sri Harmanto Sugeng Irianto Sugiono, Friska Ayu Fitrianti Supandi Suwarti Suwarti Sya’roni, Mohammad Trio Setiyawan Trio Setiyawan Tristan Yusuf Annas Tristan Yusuf Annas Wahyono Wahyono Wahyu Isti Nugroho Wattimena, Riles Melvy Wibowo, Andryana Dwiandara Widodo, Ignatius Gunawan Wiwik Purwati Widyaningsih Yanuar Mahfudz Safarudin Yuris Bahadur Wirawan Yusuf Dewantoro Herlambang Zaenal Abidin Zainal Abidin