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All Journal Jurnal Rekayasa Mesin Jurnal Rekayasa Material, Manufaktur & Energi
Pancarana, I Dewa Made
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Aerospace Engineering Control & Systems Engineering Electrical & Electronics Engineering Energy Engineering Mechanical Engineering

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Rancang bangun mesin planetary ball mill type vertikal skala laboratorium dengan variasi kecepatan putaran Pancarana, I Dewa Made; Waisnawa, I Gede Nyoman Suta; Firdaus, Muhammad Nabil
Rekayasa Material, Manufaktur dan Energi Vol 7, No 2: Juli 2024
Publisher : Fakultas Teknik UMSU

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30596/rmme.v7i2.19704

Abstract

This paper discusses the design and manufacture of a laboratory-scale vertical planetary ball mill machine with variations in rotational speed. The purpose of making this planetary ball mill machine is to support the completeness of equipment in the laboratory at the Department of Mechanical Engineering, Bali State Polytechnic.This vertical type planetary ball mill machine has dimensions of 300 x 300 x 550 mm and two stainless steel stirring tubes with a capacity of 500 ml each. The engine frame is made of hollow galvanized iron measuring 3 x 3 cm. This vertical type planetary ball mill machine is driven by an AC 125 watt 220 volt 2800 rpm electric motor. The transmission system uses one straight gear (driving gear) and two straight gears (driven gear). The driving gear is mounted on the motor shaft, while the driven gear is attached to each stirrer tube. To adjust the amount of rotation, a 2000 W/220 V AC motor dimmer is used. Tests on the vertical planetary ball mill machine were carried out 8 times using 200 grams of wheat flour and 50 grams of water (4:1) for each experiment. Four times the experiments were carried out at rotational speeds of 250, 500, 750, and 1000 rpm for 5 minutes each and four times the experiments were carried out at rotational speeds of 250, 500, 750, and 1000 rpm for 10 minutes each. The test results show that a homogeneous mixture occurs faster with increasing rotations with a fixed time or lengthening the rotation time in each round.
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.          
The Effect of Spot Welding Current on Shear Strength in St 40 Steel Plate Joints Pancarana, I Dewa Made; Suherman, I Ketut
Jurnal Rekayasa Mesin Vol. 20 No. 2 (2025): Volume 20, Nomor 2, Agustus 2025
Publisher : Mechanical Engineering Department - Semarang State Polytechnic

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/jrm.v20i2.6787

Abstract

Steel has several classifications, one of which is low carbon steel St 40. Low carbon steel plate St 40 is usually used for industry, machinery, shipping, household appliances and others. Although it is a low carbon steel and relatively easier to weld, St 40 steel still requires attention to the effects of heat. Excessive heating can change the microstructure of steel in the heat affected zone (HAZ), which has an impact on its mechanical properties. Controlling the electric current in the spot welding process greatly affects the characteristics of the welding results, such as the quality of the weld, tensile strength, hardness, area of ​​the HAZ, and the strength of external influences. This study aims to investigate the effect of electric current in the spot welding process on the shear strength of St 40 steel plate material. The method used is an experimental test, in which the spot welding process was carried out nine times on St 40 steel with three variations of input current (20.36A, 24.54A, and 28.95A) and a welding time of 8.0 seconds, using the shear test method according to the AWS D8.9M shear test standard.Based on the research results, it can be seen that the highest average shear strength is 6.72 MPa, which occurs at an input current of 28.95 A with an output current of 6011.47 A, a welding time of 8.0 seconds with a heat input of 88007.92 J and the lowest average shear strength is 1.67 MPa at an input current of 20.36 A with an output current of 6011.47 A, a welding time of 8.0 seconds with a heat input of 61894.30 J. This shows that increasing the electric current increases the shear strength value and vice versa.
Co-Authors Firdaus, Muhammad Nabil Gunawan, I Made Rai I Gede Nyoman Suta Waisnawa I Made Agus Putrawan, I Made Agus Suherman, I Ketut