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All Journal Otopro Abdi Masya
Haikal Haikal
Sekolah Tinggi Teknologi "Warga" Surakarta
Agriculture, Biological Sciences & Forestry Humanities Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Other

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PEMBUATAN RANGKAIAN KONTROL OTOMATIS UNTUK OVEN PENGERING BAHAN BAKU JAMU HERBAL DI CV. AMIR HERBAL Deni Andriyansyah; Haikal Haikal; Arif Hidayat Purwono; Emanuel Budi Raharjo; Moch. Chamim
Abdi Masya Vol 7 No 1
Publisher : Pusat Penelitian dan Pengabdian Masyarakat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.52561/abdimasya.v7i1.678

Abstract

CV. Amir Herbal is an SMEs engaged in the production of herbal medicine, with one of its important processes being the drying of raw materials in an oven. The problem partners face is the oven temperature control system, which is still manual, leading to temperature fluctuations, inconsistent product quality, and a high reliance on the operator. This community service activity aims to implement a temperature control-based oven automation system to improve temperature stability and the quality of drying results. The implementation method includes the observation stage, system design, equipment manufacturing and installation, implementation, and partner training. The system developed uses a PID controller REX-C100 integrated with a temperature sensor, solenoid valve, and an automatic gas-fueled ignition system. The implementation results show that the system maintains a more stable oven temperature relative to the setpoint value compared to the manual method. In addition, work efficiency increases due to reduced operator supervision requirements. The quality of the resulting herbal products is also more even and consistent. Thus, the implementation of this oven automation system has a positive impact on increasing productivity and production quality at CV. Amir Herbal has the potential to be further developed through the integration of digital-based monitoring technology
EFFECT OF SECTION THICKNESS ON NODULAR GRAPHITE FORMATION AND MECHANICAL PROPERTIES OF DUCTILE CAST IRON Moch Chamim; Edi Sarwono; Haikal Haikal; Margono Margono
Otopro Vol 21 No 2 May 2026
Publisher : Universitas Negeri Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/otopro.v21n2.p43-50

Abstract

This study investigates the effect of section thickness on the microstructure and mechanical response of Ductile Cast Iron (DCI) using specimens with thicknesses of specimen 20, 40, and 60 mm. Optical microscopy reveals a ferrite-pearlite matrix with spherical graphite, where the graphite nodules exhibit a tendency toward larger size and greater heterogeneity with increasing section thickness. The measured nodule diameters are approximately 17-20 µm (20 mm), 21-22 µm (40 mm), and 15-26 µm (60 mm), indicating thickness-driven changes in solidification/cooling conditions that promote graphite hardening in thicker sections. Mechanical testing shows a consistent decrease in hardness with increasing thickness: 246.8 VHN (specimen 20 mm), 226.75 VHN (specimen 40 mm), and 204.8 VHN (specimen 60 mm). Impact test results show a non-monotonic trend, increasing from 0.02 (specimen 20 mm) to 0.049 (specimen 40 mm) and slightly decreasing to 0.045 (specimen 60 mm). The highest impact value at specimen 40 mm indicates an optimal balance between matrix hardness and toughness at intermediate thicknesses, while the slight decrease at specimen 60 mm despite the lower hardness may be related to increased graphite size heterogeneity and microstructural nonuniformity in thicker sections. Overall, thickness significantly affects graphite morphology and the hardness toughness trade off in DCI, with 40 mm sections providing the most favorable toughness in this data set.
Co-Authors Arif Hidayat Purwono Chamim, Moch. Deni Andriyansyah Edi Sarwono Emanuel Budi Raharjo Margono Margono Moch. Chamim