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Jurnal Teknik Mesin
ISSN : 18298958     EISSN : 26555670     DOI : -
Jurnal Teknik Mesin adalah sebuah jurnal peer review yang didedikasikan untuk publikasi hasil penelitian yang berkualitas dalam bidang teknik mesin.
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Articles 6 Documents
Search results for , issue "Vol 12 No 2 (2019): Jurnal Teknik Mesin" : 6 Documents clear
Pengaruh Tinggi Air Masuk Dan Diameter Pipa Outlet Terhadap Tinggi Air Keluar Pompa Hidram Zulhendri Zulhendri; Yuliarman Yuliarman; Menhendry Menhendry; Nota Effiandi; Putri Adeliza
Jurnal Teknik Mesin Vol 12 No 2 (2019): Jurnal Teknik Mesin
Publisher : Politeknik Negeri Padang

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Abstract

The pump is a device that can lift water from a lower height to a higher place, but because there are many pumps in the market that use electricity as a power plant and the selling price is quite high for rural communities, an appropriate pump is needed and cheap. Hydram pump is one alternative, where the workings of this tool can raise the water to a higher place with energy or power that comes from the water itself. Making Hydram pumps itself is relatively inexpensive, simple and durable. Hydram pumps are very popular because they work without using energy, so it is suitable for use in villages that do not have electricity. The purpose of this study was to determine the effect of the height of the incoming water and the diameter of the outlet pipe on the height of the outlet water at the hydram pump. In this study the height of the incoming water was varied as high as 0.5m, 1m and 1.5m while the diameter of the aoutlaet pipe was varied by 0.5inc, ¾ inc and 1 inc. From this experiment it was found that the height of the incoming water and the diameter of the outlet pipe significantly influence the height of the outgoing water, of the two factors most influential on the height of the outgoing water is the height of the incoming water
Pengaruh Komposisi Pasir Cetak Terhadap Mutu Cetakan Pasir Coran Aluminium Bukhari Bukhari; Nofriadi Nofriadi; Yanziwar Yanziwar
Jurnal Teknik Mesin Vol 12 No 2 (2019): Jurnal Teknik Mesin
Publisher : Politeknik Negeri Padang

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Abstract

Casting is a manufacturing procces that use mold and molten metal to make parts. Geometry of the mold is almost same with the product. Shape of sand mold is negative shape of product that according to desire pattern. Making procces of mold must following right composition of sand mold. After through some test, strength of sand mold is depand on composition of mater. Value of the test on table 1 (89% sand, 9% water glass, and 2% water, has tensile strength 0,66 N/mm2 ) and compared to table 3. (85% sand, 9% water glass dan 2% water, has tensile strength 0,415 N/mm2 ). Based on the test, mold with 100% new sand has better collapse is mold with composition 94% new sand, 4% water glass, 2% water, has tensile strength 0,417 N/mm2, but, muld with 50% new sand 50% recycle sand has better collapse is mold with composition 45% new sand, 45% recycle sand, 6% water glass, and 4% water, has tensile strength 0,474 N/mm2.
Pengaruh Retrofit Refrigeran CFC-12 Dengan HCR-12 Terhadap Kinerja Refrigerator Domestik dan Perawatannya Isnanda Isnanda; Yazmendra Rosa; Elvis Adril; Feidihal Feidihal
Jurnal Teknik Mesin Vol 12 No 2 (2019): Jurnal Teknik Mesin
Publisher : Politeknik Negeri Padang

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Abstract

In the recent years,almost every house, has domestic refrigerator wich still use CFC-12 refrigerant as the fluid.When the leakage happen, the refrigerant causes the demage of ozon such as forming the ozon side then radiation of ultra violet from the sun ray in high intensity reach the surface on each directly and it is dangerous for the human life. The Hidrocarbon refrigerant (HCR-12) is considered as one of alternative, wich is environmentally friendly,more energy to save and without modification, to replace the CFC-12.This research compare the performance of household refrigerator using the CFC-12 refrigerant and HCR-12 without the modification of refrigerator.The result shown from the COP, that the refrigerators work for both of refrigerant is relatively the same and the quality of the ice product from HCR-12 is better than CFC-12, because the amount of the energy wich is absorbed by HCR-12 during the evapouration process is bigger than CFC-12. Analyzing the amount of refrigerant weight fullfilled to refrigerator, HCR-12 only uses 40 % from CFC-12,If the price of both refrigerant is the same,the use of HCR-12 is profitible than the use of CFC-12
Analisa Kinematika Monobike Mechanical Toys Menggunakan GNU Octave dan Solidworks Eva Hertnacahyani Herraprastanti; Suluh Jatmiko
Jurnal Teknik Mesin Vol 12 No 2 (2019): Jurnal Teknik Mesin
Publisher : Politeknik Negeri Padang

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Abstract

Industry era 4.0 allows the use of cyber technology, both physical and non-physical, in all aspects of life, including the toy industry. 3-dimensional printers as a key technology industry 4.0 plays an important role. Before it is printed using a 3D printer, it becomes a real product ready to be marketed, first the product is simulated to find out if the toy product can move according to the kinematics that we design. This analysis includes the displacement, velocity, and linear and angular acceleration of the Monobike component. In this research, the analysis of component movements is limited to Link 3. In this study, a toy that can mimic the motion of an object as precisely as possible is determined, which is a monobike toy. Monobike mechanical toys mimic human activities of pedaling a bicycle. The methodology in this research is as follows: 1) Determine the dimensions of the monobike component, 2) Determine the monobike drive components, 3) Make a monobike kinematic diagram, 4) Perform kinematic analysis using the position vector of the monobike component, 5) Perform displacement, velocity calculations , and theoretical acceleration with Excel, 6) Perform kinematic analysis with Solidworks, 7) Comparison of theoretical calculation results and Solidworks simulation results. Based on the results of theoretical research and Solidworks simulations, the values ​​of displacement, velocity and acceleration are close. The average error for linear displacement is 0.261%, linear velocity 0.852%, linear acceleration 0.7664%, angular velocity 0.372%, and angular acceleration 0.492%. Kinematic analysis in monobike mechanical toys theoretically using Excel and simulation with Solidworks software, the results are more or less the same, so it can be said that this research is accurate. Solidworks is recommended as software that can be used to simulate movements in kinematic analysis.
Pembentukan Fasa Co3O4 Dengan Metoda Dekomposisi CoCO3 Menggunakan Sinar Diffraksi Lusiana Lusiana; Sigit Dwi Yudanto
Jurnal Teknik Mesin Vol 12 No 2 (2019): Jurnal Teknik Mesin
Publisher : Politeknik Negeri Padang

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Experiments have been carried out to obtain the decomposition of cobalt carbonate cobalt oxide to be used as raw material for the manufacture of calcium cobalt oxide thermoelectric materials. The experiments were performed by heating cobalt carbonate powder material (CoCO3) from Kanto Chemical with a temperature of 1000°C. Heating aims to obtain Co3O4 phase. Co3O4 phase is what will be used in the manufacture of thermoelectric materials based on the phase diagram of the system Ca-Co-O. The results of X-ray diffraction CoCO3 materials are heated to 1000°C showed that Co3O4 phase has been formed. Analysis quantitative diffraction pattern shows the diffraction peaks are the property throughout the Co3O4 phase. The crystal structure of Co3O4 is Face Centered Cubic (FCC) with space group F d -3 m. Lattice parameters of the diffraction pattern is the result of smoothing a = 8.0838 Å.
Perbaikan Kualitas Mata Pisau Mesin Irat Bambu Dengan Proses Heat Treatment Melalui Baja Fasa Ganda Togik Hidayat; Teguh Raharja
Jurnal Teknik Mesin Vol 12 No 2 (2019): Jurnal Teknik Mesin
Publisher : Politeknik Negeri Padang

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Mata pisau mesin irat bambu berperan penting dalam menentukan kualitas produk industri kreatif bambu di desa Kebonagung Kecamatan Padangan Kabupaten Bojonegoro. Alat pemotong harus memiliki karakteristik menghasilkan kualitas pemotongan baik [9] . Kualitas pisau mesin irat bambu dapat dilihat dari hasil potongan dan life time. Faktor yang mengurangi kualitas dan life time mata pisau adalah gesekan dan panas. Cara meningkatkan kualitas dan life time dapat dilakukan dengan memperbaiki sifat mekanisnya. Perbaikan sifat mekanis dapat dilakukan melalui heat treatment, surface treatment, coating dan lain-lain [5]. Penelitian ini dilakukan dengan tujuan untuk meningkatkan kualitas mata pisau mesin irat bambu dengan mengetahui perubahan sifat mekanis melalui perubahan struktur mikro, nilai kekerasan optimal, dan kekuatan tarik maksimal. Penelitian dilakukan dengan metode eksperimen menggunakan analisis skala laboratorium. Proses heat treatment mata pisau irat bambu dilakukan pada temperatur 725°C dengan holding time 10 menit, 20 menit, 30 menit, proses tempering pada temperatur 600°C selama 20 menit. Hasil uji struktur mikro mata pisau dengan holding time 30 menit memiliki ukuran butir logam yang lebih halus dan merata. Nilai kekerasan tertinggi adalah 59,13 HRC pada mata pisau dengan holding time 30 menit. Nilai rata – rata modulus elastisitas tertinggi adalah pada specimen dengan holding time 20 menit yaitu 6,87 N/mm2.

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