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All Journal ASAWIKA: Media Sosialisasi Abdimas Widya Karya METAL
Harsa Dhani
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Humanities Control & Systems Engineering Energy Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Social Sciences

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Journal : METAL

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MAINTENANCE ON SUGAR CANE MILL ROLLERS TO PREVENT WEAR AND DAMAGE Harsa Dhani; Jahu, Reinardi Oddilian; Redationo, Nereus Tugur
Mechanical, Energy and Material (METAL) Vol. 1 No. 2 (2023): Desember: Mechanical, Energy and Material (METAL)
Publisher : Universitas Katolik Widya Karya Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59581/metal.v1i2.91

Abstract

One of the reasons the Sugar Factory failed to meet its sugar production target was due to damage to the machine components, particularly at the milling station, where the milling rollers are located. The milling rollers play a crucial role in extracting juice from sugar cane, separating the juice from the bagasse, and measuring the raw juice before it enters the purification process. This unit is designed to maximize raw juice yield while minimizing the amount of bagasse. The milling rollers are arranged in a triangular configuration of three mills, with a milling path between the front and rear rollers that can move forward and backward. Several common issues affect the milling rollers, including surface wear, damage from excessive loads, and wear from repeated friction between the rollers and the sugar cane. Sugar cane itself contributes to roller wear due to its composition, which includes water, sucrose, cellulose, lignin, hemicellulose, ash, and silica. These substances are highly corrosive, even to stainless steel, and act like abrasives against the rollers. The usual remedy at the factory is to weld stainless steel onto cast iron rollers. However, this method has only been moderately effective, as the rollers continue to experience wear after a short period. Based on field observations and literature reviews, some suggested solutions include more frequent cleaning and applying a tungsten coating to the roller surfaces.
ASSESSMENT OF MOBILE ROBOT LOAD-CARRYING POTENTIAL VIA DC GEARBOX MOTOR TORQUE Harsa Dhani; Redationo, Nereus Tugur; Dhancis, William
Mechanical, Energy and Material (METAL) Vol. 2 No. 1 (2024): Juni: Mechanical, Energy and Material (METAL)
Publisher : Universitas Katolik Widya Karya Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59581/metal.v2i1.93

Abstract

The primary function of mobile robots is to transport various loads, including their own weight and additional cargo. Ensuring adequate torque in the wheel motors is crucial for effective load-bearing and movement. This study investigates the load-carrying capabilities of the TT DC gearbox motor, a popular and cost-effective choice for small robots. A mobile robot equipped with four TT DC gearbox motors and employing skid steering locomotion was constructed for this purpose. The robot featured a container designed to carry sand, and its load capacity was tested by gradually increasing the weight until the robot could no longer move. Experimental results showed that the maximum load the robot could carry on a flat surface was 4000 grams, which corresponds to 1000 grams per 5 cm diameter wheel, driven by a stall torque of 0.08336 Nm (0.85 kg.cm). This finding is consistent with the motor's specified stall torque of 0.8 kg.cm at 6V. These results suggest that the maximum load of a mobile robot can be predicted using the motor's stall torque specification and the wheel radius through the total tractive effort (TTE) formula. This study offers valuable insights into estimating the performance limits of DC gearbox motors used in driving mobile robots.
KINEMATIC ANALYSIS OF HORIZONTAL SEALER, VERTICAL SEALER, AND DRAWING ROLLER IN A TEMPEH PACKAGING MACHINE PROTOTYPE Harsa Dhani; Redationo, Nereus Tugur; Natanael, Abel
Mechanical, Energy and Material (METAL) Vol. 2 No. 1 (2024): Juni: Mechanical, Energy and Material (METAL)
Publisher : Universitas Katolik Widya Karya Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59581/metal.v2i1.94

Abstract

The automatic packaging machine for tempeh improves both hygiene and efficiency in production. This Vertical Form Fill Seal model, equipped with a hole-punching mechanism, is examined in this study with a focus on the kinematics of its three key components: the horizontal sealer, vertical sealer, and drawing roller. The horizontal and vertical sealers are actuated by a single DC gear motor operating at 40 rpm, which manages their intermittent opening and closing. Additionally, a stepper motor running at 30 rpm controls the timing and drawing length of the plastic packaging, ensuring precise start and stop functions. The study's results revealed the following performance metrics for the machine's components: The horizontal sealer achieved a stroke distance of 62.4 mm, with the sealer operating at a maximum speed of 75.71 mm/s, and a total travel time of 1.65 seconds from closed to open position. For the vertical sealer, the stroke distance was 63 mm, with the sealer moving at maximum speed of 89.67 mm/s, and a travel time of 1.4 seconds from fully open to fully closed. The friction roller, driven by a stepper motor at 30 rpm, achieved a plastic withdrawal speed of 59.66 mm/s, allowing it to pull the plastic a maximum length of 167 mm within each 2.8-second cycle of the sealer components. It can be observed that continuous motor movement can be converted into intermittent back-and-forth motion using bar mechanisms, with the velocity at each position varying based on the length of the bars.
ACCURACY AND PRECISION OF AN INDOOR AUTONOMOUS MOBILE ROBOT LOCALIZATION UTILIZING A RFID READER MFRC522 Harsa Dhani
Mechanical, Energy and Material (METAL) Vol. 1 No. 1 (2023): Juni: Mechanical, Energy and Material (METAL)
Publisher : Universitas Katolik Widya Karya Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59581/metal.v1i1.38

Abstract

To properly navigate inside a factory or a building, a mobile robot should know its position relative to the working environment. The estimation of the robot position based on sensors interpretation is called localization. One particular method of localization is by the utilization of Radio Frequency Identification (RFID) tags mounted on the floor and a RFID reader and an antenna installed on the robot. When the robot reads a particular tag, the robot can estimate its position. The aim of this research is to examine the accuracy and the precision of mobile robot localization equipped with RFID reader MFRC522 which detects chip less tag MIFARE S50. A mobile robot with four wheels was put on a position and a tag along with a ruler was attached on 60 cm ahead. When the robot detected the tag, it stopped, and the stop positions were recorded for accuracy and precision. The robot gained accuracy of 6,3 cm and precision of between 0,867 cm dan 1,263 cm. The prominent factors affecting inaccuracy and imprecision were the robot speed and the lack of braking mechanism. However, the results are still reasonable for indoor mobile robot application in relative to the robot size.
Co-Authors Dhancis, William Jahu, Reinardi Oddilian Natanael, Abel Rahmanti Ignatia, Sari Perwita Redationo, Nereus Tugur Sendy Fransiscus Tantono Sunik