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Sutopo
Universitas Negeri Yogyakarta

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Design and manufacture of a Semi-Automatic Cassava Chips Slicing Machine Sutopo; Devi Kusumawati
Journal of Applied Mechanical Engineering Innovation Volume 01, No. 01 April 2025
Publisher : Program Studi Sarjana Terapan Teknik Mesin, Fakultas Vokasi, Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/jamei.v1i1.879

Abstract

Cassava is one of the commodities that is widely processed in Pagerharjo village, especially by the Madu Lestari Women Farmers Group (WFG). The problem found in WFG is that the production process of cassava chips is still done manually and has not been touched by the appropriate technology desired by KWT. This affects the capacity produced in production not much and limits labor. The purpose of this research is to explain the design process or design, explain the process of machining and test and analyze the factual capacity produced by the semi-automatic system cassava chips slicing machine. The research method used is research and development. The research process starts from observation, needs analysis, design, machine building, assembly, performance testing, data collection and analysis. Data analysis uses descriptive and quantitative theoretical considerations. The results of the study produced a cassava chips slicing machine semi-automatic system capable of producing a production capacity of 62.1 kg/h with a driving motor power of ΒΌ Hp.
The Design of A Coffee Pulper Machine By Using Inventor Autocad Software Sutopo; Khairul Irsad
Journal of Applied Mechanical Engineering Innovation Volume 01, No. 01 April 2025
Publisher : Program Studi Sarjana Terapan Teknik Mesin, Fakultas Vokasi, Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/jamei.v1i1.880

Abstract

Coffee is one of the favorite beverages enjoyed by people from all walks of life. The main challenge in the coffee bean peeling process in small and medium enterprises (SMEs) is that it is still done manually. The primary goal of creating this technological innovation is to assist workers in the production process by using appropriate technology, thereby improving the quality, effectiveness, and efficiency of their work. The design optimization and manufacturing process of the coffee pulper machine begins with literature studies, design and calculations, the fabrication of the machine, and ends with testing. The design is created using Inventor Autocad software. The coffee peeling machine measures 110 cm x 127 cm x 130 cm and is powered by a gasoline engine with an initial speed of 1800 rpm, which increases to 3600 rpm. It uses two pulleys with a ratio of 1:6, an A-75 V-belt, and a solid shaft with a diameter of 20 mm. The final result shows that the coffee pulper machine has a capacity of 610 kg per hour.
The Effect of Alkali Treatment Duration on the Tensile Strength and Physical Properties of Polyester Composites Reinforced with Coconut Fiber Komar Roni; Sutopo; Nur Muhammad Rusydi
Journal of Vocational Applied Research and Studies Vol. 2 No. 2 (2025)
Publisher : Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/jvars.v2i2.2522

Abstract

This study aims to determine the effect of alkali treatment duration with NaOH on the tensile strength and physical properties of coconut fiber-reinforced composites. The method used in this study was experimental, with variations in the duration of alkali treatment: 1, 2, and 3 hours. A total of 15 specimens were used for tensile testing. The specimens were prepared by hand lay-up, and tensile testing was conducted according to ASTM D638. The collected data were analyzed descriptively and presented in tables and graphs. The results of this study indicate that the duration of alkali treatment on fibers can affect the tensile strength and physical properties of polyester composites reinforced with coconut fiber. The results of this study show that the highest tensile strength was obtained at an alkali treatment duration of 1 hour, with a value of 19.322 MPa, and the lowest tensile strength was obtained at 2 hours, with a value of 13.826 MPa. The highest elastic modulus was observed at an alkali treatment duration of 3 hours with a value of 16.842 MPa. The lowest elastic modulus was observed at an alkali treatment duration of 1 hour with a value of 12.857 MPa. The microstructure photos were consistent with the tensile strength, i.e., the fewer defects in the fracture, the higher the tensile strength.
Co-Authors Devi Kusumawati Khairul Irsad Komar Roni Nur Muhammad Rusydi