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Christof Geraldi Simon
Universitas kristen indonesia Toraja
Religion Agriculture, Biological Sciences & Forestry Humanities Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Dentistry Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Languange, Linguistic, Communication & Media Materials Science & Nanotechnology Mathematics Mechanical Engineering Neuroscience Nursing Public Health Social Sciences Veterinary Other

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Dampak Pembubutan Pahat Karbida Tungsten Dengan Variasi Kedalaman Pada Baja ST 40 dan 45 Terhadap Kekasaran Permukaan Lasarus, Risa; Lorens, Dennis; Paliling, Formanto; Christof Geraldi Simon
Jurnal Teknik Mesin Sinergi Vol 23 No 1 (2025): April 2025
Publisher : Politeknik Negeri Ujung Pandang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31963/sinergi.v23i1.5482

Abstract

Baja merupakan suatu material yang mempuyai peranan penting dalam dunia industry, baja sering kali digunakan sebagai bahan dasar pembuatan komponen mesin maupun kontruksi. Dalam aplikasi pemakaian dibidang kontruksi, baja karbon sering digunakan dalam bidang bangunan. Sedangkan dalam dunia permesinan dan otomotif baja karbon sering digunakan sebagai bahan untuk pembuatan komponen poros, roda gigi dan lain sebagainya. Penelitian kali ini bertujuan untuk mengetahui nilai kekasaran permukaan pada baja karbon ST 40, baja karbon ST 45 pada proses pembubutan dengan menentukan  variasi kedalaman potong menggunakan pahat karbida.Proses penelitian ini menggunakan metode pengaruh kedalaman potong kemudian melakuhkan pengolahan data hasil kekasaran permukaan pada proses pembubutan menggunakan pahat karbida dengan putaran mesin tetap 500 rpm dan kedalaman potong kedua material yang tetap 0,3 mm, 0,4 mm, 0,5 mm, 0,6 mm dan 0,7 mm. Material yang digunakan adalah baja karbon ST 40 dan baja karbon ST 45 Berdasarkan hasil pengujian kekasaran permukaan pada proses pembubutan, dimana baja karbon ST 40 nilai kekasaran permukaan tertinggi terdapat pada kedalaman potong 0.7 mm yaitu sebesar 0,027 μm dan nilai kekasaran permukaan terendah terdapat pada kedalaman potong 0,3 yaitu sebesar 0,016 μm. Sedangkan untuk baja karbon ST 45 nilai kekasaran permukaan tertinggi pada kedalaman potong 0,7 mm sebesar 0,045 μm dan nilai kekasaran permukaan terendah terdapat pada kedalaman potong 0,3 mm sebesar 0,033 μm.
Comparison of the Effect of Variable Helix Angle Geometry Tools on CNC Vertical Milling Machines on Chatter using a microcontroller Based on SLD Simon, Christof Geraldi; Hardinsi, Festo Andre; Paliling, Formanto
INTEK: Jurnal Penelitian Vol 10 No 1 (2023): April 2023
Publisher : Politeknik Negeri Ujung Pandang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31963/intek.v10i1.4265

Abstract

Vibrations that often occur in the production process using CNC milling machines are very important to take into account. These vibrations can cause dimensional changes and affect the level of quality produced, so the effect of chatter vibrations on production becomes a major problem in the milling process. Vibration values are determined using SLD graphs experimentally, analytically and semi-analytically. The material used in this study is SS 304, MPU 6050 which is connected to Arduino Uno using LabVIEW 2019 student edition software in the form of FFT charts. Data collection using experimental methods, tool geometry parameters are tool geometry VHA 35/38 degrees and VHA 36/38 (Degrees), Spindle Speed 2000,2500,3000 (RPM), Depth Of Cut 0.4, 0.7, 1 (mm), and Feed Rate 100, 125 and 150 (mm/s). The results of the SLD study used a variable helix angle of 35/38 degrees at a feed rate variation of 100 mm / minute chatter at cut depths of 1, 0.7 and 0.7 mm, at a feed rate variation of 125 mm / minute chatter at a cut depth of 0.7, 1 and 0.7 mm. At feed rates of 150 mm/min at cut depths of 1, 1, and 0.7 mm with spindle speeds equal to 2000.2500 and 3000 RPM. While VHA results of 36/38 degrees at a feed rate of 100 mm / minute experienced chatter at cut depths of 0.7.1 and 1 mm, at feed rates of 125 mm / minute chatter at cut depths of 1.1 and 0.7 mm. At a feed rate variation of 150 mm/min chatter at cut depths of 1.1, and 0.7 mm with the same spindle speeds of 2000.2500 and 3000 RPM.Keywords : Chatter, VHA, SLD, microcontrolle, FFT
Tensile Analysis of Epoxy Resin Composite Material with Petung Bamboo Strip Reinforcement Bethony, Frans Robert; Pineng, Marthina; Paliling, Formanto; Simon, Christof Geraldi
INTEK: Jurnal Penelitian Vol 10 No 2 (2023): October 2023
Publisher : Politeknik Negeri Ujung Pandang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31963/intek.v10i2.4578

Abstract

This study aims to analyze the optimal tensile strength of epoxy resin composite material with woven bamboo strips (Dendrocalamus asper). Petung bamboo is made in strips measuring 0.01 cm, 0.1 cm wide, 45 cm long and then woven then soaked in brackish water with variations of soaking for 0, 1, 2, 3, and 4 weeks with river water salinity levels of 10, 20 and 30%. The printed composite material with a composition of 60% epoxy resin and 40% catalyst as a hardener with  1, 2, and 3-layer woven strips and held for 24 hours. Composite material printing by hand lay-up method. For 1 layer of woven composite material, epoxy resin is poured into a mold then woven petung bamboo strip and covered with epoxy resin pressed for 24 hours. The composite material is removed from the molded container and then left in an outdoor airtight room for one week. Composite materials are repaired to ascertain whether there are still defects or no longer exist, especially on the surface of composite materials. The next process is the manufacture of test samples, for tensile tests based on ASTM (D638-02) Before the test is carried out, the sample is repaired first to ensure that the sample is in a standard state to be ready for testing.  Test results of optimal tensile strength of composite materials with woven reinforcement of petung bamboo strips without immersion of 1 layer (40.22 MPa), 2 layers (50.13 MPa), and 3 layers (60.07 MPa). The optimal tensile strength of composite materials with 1 layer of webbing and soaking time of 3 weeks (51.08 MPa) has increased (19.12%). The optimal tensile strength of composite materials with 2-layer webbing and soaking time of 2 weeks (61.05 MPa) has increased (20.69%). The optimal tensile strength of composite materials with 3-layer webbing and soaking time of 2 weeks (70.15 MPa) has increased (19.08%). Keywords: composite material, bamboo petung, woven strip, brackish water, tensile strength
Design of Experiments (Doe) on Suspension Test Equipment of One Part Of A Vehicle Wheel Using The Taguchi Method Simon, Christof Geraldi; Paliling, Formanto; Lasarus, Risa; Salo, Lery Alfriany; Bethony, Frans Robert; ka’ka, Simon
INTEK: Jurnal Penelitian Vol 10 No 2 (2023): October 2023
Publisher : Politeknik Negeri Ujung Pandang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31963/intek.v10i2.4581

Abstract

Suspension is the most important thing that must be taken into account because it greatly affects driving comfort on the road. The working mechanism of the suspension consisting of spiral springs and shock absorbers is loaded vertically from the weight of the body, driver, and passengers. The uneven shape of the road surface in the form of potholes or bumps will greatly affect the comfort of the driver. This study aims to determine the effect of suspension work and the optimal value of vibration that occurs on one of the wheels of the vehicle against vertical dynamic loads. The method used in this study uses the Taguchi method which is used to determine the optimum dynamic load conditions against vibration in the suspension system.   The characteristics used in this method are "Smaller is better". Several variables such as bump height, tire pressure on the wheels, as well as vehicle body weight and passenger weight are necessary factors to calculate optimal dynamic load conditions against vibration in the suspension. Based on the results of the optimum value conditions obtained, namely the height of the mound of 5 cm, tire pressure of 32 Psi, load of 84 kg, and dynamic load of 71 kg. From the results of the contribution rate to the ANOVA obtained, factor A (bump height) and factor D (dynamic load) are significant factors while factor B (tire pressure) and factor C (load load) are insignificant factors. Under optimal conditions, there was a decrease in suspension vibration value by 49.65%.
Comparison of The Pull Strength of Sisal Lamina Matrix Polymer Fiber Composite Materials (Agave Sisalana) Fikran, FIkran; Simon, Christof Geraldi; ka’ka, Simon
INTEK: Jurnal Penelitian Vol 10 No 2 (2023): October 2023
Publisher : Politeknik Negeri Ujung Pandang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31963/intek.v10i2.4582

Abstract

Composites are one of the material engineering technologies developed today because composites can combine several material properties that differ in characteristics into new properties by the planned design. The purpose of this study was to determine the mechanical properties of the influence of the combined arrangement of lamina angle variations and the composition of fiber and matrix mixtures. This study uses polyester resin, catalyst, and sisal fiber as materials in the manufacture of composite materials. In specimen manufacturing refers to ASTM D 638-02 type 3 test standard for tensile tests. The tensile test results of sisal fiber lamina composite materials assuming a composition ratio of 5% fiber and 95% resin produce maximum tensile stress of m = 16.9854 N/mm2 and a maximum strain of ɛ = 4.5232% while assuming a composition ratio of 15% fiber 85% resin produces maximum tensile stress of sm = 40.1422 N/mm2 and maximum strain of ɛ = 8.9744 %, Based on the test results, the addition of fiber mixture composition increases the tensile strength and toughness of the material. The composition of 5% fiber 95% and 15% fiber 85% resin (15S-85R)produces a maximum tensile stress of sm =  45.1823 N/mm2 and a maximum strain of ɛ = 9.6849 % with a maximum load Fm = 10902.4996 N. The more fiber contained in the sisal fiber lamina composite material, the higher the tensile stress produced, this shows the tension is directly proportional to the number of fibers contained in the composite.
Penggunaan Kebun Percontohan sebagai Upaya Mendorong Sukses Pertanian Organik di Lembang Toyasa Akung, Bangkelekila, Toraja Utara Paliling, Formanto; Geraldi Simon, Christof; Bethony, Frans R; Lasarus, Risa; Alfriany Salo, Lery; Fikran, Fikran; Ramba, Dina
Jurnal Pengabdian kepada Masyarakat Nusantara Vol. 5 No. 1 (2024): Jurnal Pengabdian kepada Masyarakat Nusantara (JPkMN)
Publisher : Lembaga Dongan Dosen

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55338/jpkmn.v5i1.2816

Abstract

Implementasi kebun percontohan sebagai sarana edukatif terkait pertanian organik di Lembang Toyasa Akung, Toraja Utara. Kebun percontohan ditujukan untuk mendemonstrasikan praktik pertanian organik yang berkelanjutan dan sebagai pusat pembelajaran bagi masyarakat setempat. Metode inovatif yang diintegrasikan dalam kebun percontohan adalah sistem terbas mekanis, dimana mesin rumput digunakan untuk mengelola biomassa dan menjaga kesuburan tanah. Metode terbas mekanis dipilih karena efektivitasnya dalam mengendalikan pertumbuhan rumput dan sebagai alternatif mekanis yang ramah lingkungan dalam mengurangi penggunaan herbisida. Penerapan sistem ini diharapkan dapat mendorong kesuburan tanah secara alami serta mempertahankan kesehatan ekosistem pertanian dengan memanfaatkan hasil terbasan sebagai mulsa organik, yang mendukung siklus nutrisi tanah. Pengabdian masyarakat yang berfokus pada penyiapan lahan dan pendidikan tentang pertanian organik di lembang ini telah menghasilkan kemajuan dalam pengetahuan dan keterampilan bertani organik di kalangan masyarakat. Dengan kegiatan yang dilaksanakan pada 31 Agustus 2023, keberhasilan kebun percontohan ini menjadi titik awal penting dalam praktek pertanian berkelanjutan di TorajaUtara, dan diharapkan dapat diadopsi lebih luas.
Inovasi Pembuatan Pupuk Bokashi untuk Meningkatkan Produktivitas Pertanian di Bangkelekila’ Kabupaten Toraja Utara Paliling, Formanto; Geraldi Simon, Christof; Lasarus, Risa; Ambabunga, Yusri Anugerah Manapa
Jurnal Pengabdian kepada Masyarakat Nusantara Vol. 7 No. 1 (2026): Edisi Januari - Maret
Publisher : Lembaga Dongan Dosen

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Pengabdian kepada masyarakat ini bertujuan untuk meningkatkan pemahaman dan keterampilan petani di Lembang To’yasa Akung mengenai pembuatan pupuk bokashi sebagai alternatif pupuk organik. Metode yang diterapkan meliputi penyuluhan dan pelatihan pembuatan pupuk bokashi dengan memanfaatkan bahan-bahan lokal, seperti jerami, kotoran ternak, dan EM-4, serta teknik pengomposan aerobik dan anaerobik. Kegiatan ini berlangsung selama tiga minggu, dengan pengamatan terhadap kecepatan proses fermentasi sebagai parameter keberhasilan. Hasil kegiatan menunjukkan bahwa penerapan EM-4 signifikan mempercepat proses pengomposan, menghasilkan pupuk organik berkualitas yang siap digunakan dalam waktu yang lebih singkat dibandingkan metode konvensional. Pupuk bokashi yang dihasilkan tidak hanya meningkatkan kandungan hara tanah, tetapi juga memperbaiki struktur dan sifat fisik tanah, yang berdampak positif pada pertumbuhan tanaman.
Co-Authors Ambabunga, Yusri Anugerah Manapa Bethony, Frans R Chendri Johan Damaris Arrang Dennis Lorenza Dennis Lorenzo FIkran Fikran Formanto Paliling Frans Dedi Dena Frans Robert Bethoni Frans Robert Bethony Hardinsi, Festo Andre Jhoy, Zerial Lery Alfriany Salo Martina Pineng Nitha Nitha Nofrianto Pasae Pineng, Marthina Ramba, Dina Riki Masero Risa Lasarus Sallolo Suluh Sampelawang, Petrus Simon Ka’ka Sombolayuk, Oktovianus Sudirman, Zainal Syamsiar, Syamsiar Theresyam Kabanga Victor Victor Widi Kurniawan Yafet Bontong Yusri Anugerah Manapa Ambabunga