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All Journal INVOTEK: Jurnal Inovasi Vokasional dan Teknologi Jurnal Rekayasa Material, Manufaktur & Energi JAMETECH
I Made Agus Putrawan, I Made Agus
Mechanical Engineering Department University of Udayana, Bali-Indonesia
Aerospace Engineering Automotive Engineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Mechanical Engineering Transportation

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Rancang bangun mesin CNC router 3 axis dengan penggerak ballscrew untuk kerajinan acrylic Pancarana, I Dewa Made; Putrawan, I Made Agus; Gunawan, I Made Rai
Rekayasa Material, Manufaktur dan Energi Vol 8, No 1: Januari 2025
Publisher : Fakultas Teknik UMSU

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30596/rmme.v8i1.22135

Abstract

This research aims to design, manufacture and test a 3-axis CNC router machine with a ballscrew drive that can process acrylic into an artistic craft that has accurate, precise, neat and effective dimensions. In this research, a design was carried out to design a 3 axis CNC router machine with a ballscrew drive that suits the needs of medium and large scale industries. The working principle of a 3 axis CNC router machine with a ballscrew drive is to create a design using CAD or CAM software, then the design is converted to G-code (machine code), so that the machine can work according to G-code coordinates. The results of this research include design and construction which includes design designs, design calculations, manufacturing processes, and results of the accuracy of using acrylic materials. The results of the design and construction of a 3 axis CNC router machine with a ballscrew drive, namely a cutting work area of 800 mm x 600 mm x 100 mm, using a Breakout board controller as a controller, using a PC or laptop to find out the MDI movement of G-code coordinates. The cutting results of spindle rpm 6000, 8000, and 10,000 with varying feed rates will affect the roughness of the workpiece cutting results. The conclusion from varying the feed rate is: the greater the feed rate in units (mm/minute), the rougher the cutting results. , and vice versa, if the feed rate is smaller, the results of cutting the workpiece will be smoother.          
Performance of Automatic Temperature Control System in Pyrolysis Reactor of LDPE Plastic Waste Putrawan, I Made Agus; Susila, I Nengah Darma; Suparta, I Nyoman
invotek Vol 23 No 3 (2023): INVOTEK: Jurnal Inovasi Vokasional dan Teknologi
Publisher : Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/invotek.v23i3.1129

Abstract

Pyrolysis is a process of decomposing material at high temperatures without or with limited air and is an alternative waste treatment which is considered quite prospective to be developed. Plastic waste treatment as pyrolysis fuel, is strongly influenced by operating conditions, which consist of the thermal properties of plastics such as the LDPE type, which are still massively used in society. This research processes LDPE type plastic waste using technology fixed bed pyrolysis type batch reactor with a capacity of 0.01 m³ with initial heating from external heat of LPG energy source. The pyrolysis process takes in a closed reactor and the mass flow rate of the condensate flows naturally to the condenser for the condensation process to become pyro-oil product. Optimization of the reactor pyrolysis was carried out by adding insulated heat cover to reduce heat losses during the heating process. The addition of automatic temperature control to regulate the heating rate, makes operation control easier and reducing fluctuations in temperature distribution during pyrolysis process. The research was carried out with three operating temperature variations of 250, 275, and 300 °C using 0.8 kg LDPE plastic waste for batch test. The performance of automatic temperature control was observed using a digital thermometer and a comparison of the results before and after installation was carried out at a temperature of 300 °C. The results showed that heating temperature control which was previously done manually gives fluctuating results with a temperature difference of up to 50 °C. With the addition of an automatic temperature control system, the operating temperature during the pyrolysis process shows relatively lower fluctuations with a maximum difference of 20 °C. The initial heating energy consumption from LPG and the fuel consumption rate (FCR) show an increase along with the increase in the pyrolysis operating temperature setting.
Studi Eksperimental Perpindahan Panas pada Pengering Sepatu Berbasis Rak Datar Putrawan, I Made Agus; Adiaksa, I Made Anom; Wibawa, I Wayan Suma; Adi, I Ketut
Journal of Applied Mechanical Engineering and Green Technology Vol. 4 No. 1 (2026): April
Publisher : Unit Publikasi Ilmiah, P3M, Politeknik Negeri Bali

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31940/jametech.v4i1.20-25

Abstract

Shoe drying is a crucial process for maintaining hygiene and extending the lifespan of footwear, especially in high-humidity environments. This study aims to experimentally investigate the heat transfer characteristics of a flat-rack-based shoe dryer. The system is designed with electric heating elements and a horizontal rack configuration to promote uniform heat distribution. Key observed parameters include inlet air temperature, shoe surface temperature, drying time, and moisture content reduction. Measurements were conducted at multiple rack levels to evaluate vertical and horizontal temperature distribution. The results indicate that forced convection is the dominant heat transfer mechanism, with relatively uniform temperature distribution observed in the middle racks, while the top and bottom racks experienced temperature deviations. The heat transfer by radiation generated by the shoe dryer is 5.41 J/s, and the convective heat transfer is 238.8 J/s. The moisture content loss increases with drying time, indicating that 90 minutes is the optimal drying duration among the tested variations. This study provides a foundation for the development of more energy-efficient shoe drying systems and highlights the potential for integrating alternative heat sources such as solar energy.
Co-Authors Adi, I Ketut Gunawan, I Made Rai I Dewa Made Pancarana I GAN Subawa, I GAN I Made Anom Adiaksa I Nengah Darma Susila, I Nengah Darma I Nyoman Suparta I Nyoman Suprapta Winaya I Wayan Suma Wibawa Putu Lokantara Rukmi Sari Hartati