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Logic : Jurnal Rancang Bangun dan Teknologi

LOGIC
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Published by Politeknik Negeri Bali

ISSN : 1412114X EISSN : 25805649 DOI : -

Core Subject : Science, Education,

Computer Science & IT Education

Logic : Jurnal Rancang Bangun dan Teknologi is a peer-reviewed research journal aiming at promoting and publishing original high quality research in all disciplines of engineering and applied technology. All research articles submitted to Logic should be original in nature, never previously published in any journal or presented in a conference or undergoing such process across the world. All the submissions will be peer-reviewed by the panel of experts associated with particular field. Submitted papers should meet the internationally accepted criteria and manuscripts should follow the style of the journal for the purpose of both reviewing and editing.

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Articles 8 Documents

Search results for , issue "Vol 18 No 2 (2018): July" : 8 Documents clear

DESIGNING PLASTIC CUPES RING CUTTING MACHINE TO INCREASE PRODUCTIVITY Achmad Wibolo; I Nengah Ludra Antara
Logic : Jurnal Rancang Bangun dan Teknologi Vol 18 No 2 (2018): July
Publisher : Pusat Penelitian dan Pengabdian kepada Masyarakat (P3M) Politeknik Negeri Bali

The existence of plastic makes the society’s lives easier and more practical. Recently, the various kinds of products are made from this material because the votes are more durable. Plastics also give a negative effect for the environment such as soil pollution. The purpose of designing this plastic cup ring cutting machine is to sort the kind of plastics and to accelerate the process of plastic recycling, so that the plastic processing can be done faster. The authors designed a plastic cup ring mowers with electric motor mover. The design concepts of this machine are the height of machine is: 90 mm of height with a width of 50 mm, frame in size of 50 mm x 50 mm made from angled steel. This machine uses two vertical cutting blades and one horizontal cutting blade. The activator which is used in this machine is an electric diesel 1/4 HP with the rotation speed of 1400 rpm, belt-V type A38 as a link of the diesel rotation to the spindle. It is used two pieces of cushions because the direction of the load presses is perpendicular to axis of the shaft. So it is used bearing type of UCF pillow block in the diameter of 75 mm. The cutting process is done in a standing position and the button is pressed manually by using manpower, so that the rotation can become stable. If using a machine the process of cutting a ring of plastic cup can be accelerated. Manually it can be produced approximately 5 pieces of plastic cups. But, if using a machine, it can be produced approximately14 pieces of plastic cups.

STEEL TWIST (St. 42) STRENGTH CHANGES ANALYSIS WITH QUICK HEATING AND COOLING USING PLAIN WATER AT 800”C TEMPERATURE I Ketut Rimpung
Logic : Jurnal Rancang Bangun dan Teknologi Vol 18 No 2 (2018): July
Publisher : Pusat Penelitian dan Pengabdian kepada Masyarakat (P3M) Politeknik Negeri Bali

Steel twist is often happened on machine component that is the axis that its main function to continue power and circle. So, the choosing of axis substance that will be used is very important to know the strength of its twist, so it is safe to be used. This research is the research continuation that is has ever done before. Steel as technical material is often used as machine components, the strength to the external load is very needed to be known before it is used. The external load that is often happened to the machine component is twist load, pull load, bend load, and pound load. This research analyze the standard steel twist St.42 after it is heated at 800’C temperature with quick cooling, using plain water that is done in material test laboratory, majors in Machine Technical, Bali State Polytechnic. The research is aimed to get how big is the St.42 steel strength changes and its twist angle changes after being heated until 800’C and being quick cooled by using plain water, infact it becomes more tough and becomes more twist endure compared to standard St.42 steel. Its strength changes shows there is twist strength improvement until 38, 549%, that is from 503,7021855 (N/mm2) becomes 697,8735409(N/mm2), thus the steel angle arises, even the specific twist angle arises from 0,959385993 (‘/mm) becomes 9.403372244(‘/mm).

THE COST OBTAINED BY APPLYING PRECEDENCE DIAGRAM METHOD TOWARD THE TIME OPTIMIZATION ON BUILDING DEVELOPMENT PROJECTS I Made Tapa Yasa; I Made Anom Santiana; I Gede Sastra Wibawa; I Wayan Suasira
Logic : Jurnal Rancang Bangun dan Teknologi Vol 18 No 2 (2018): July
Publisher : Pusat Penelitian dan Pengabdian kepada Masyarakat (P3M) Politeknik Negeri Bali

The complexity of the project expands along with the progress of human civilization. The problems that appear will be more numerous and complicated. The role of project management is indispensable in order to address and prevent these problems, so that the cost,the quality and the time agreed upon can be realized. Cost and time relationship is not directly proportional, so it is necessary to determine the optimal time by optimum cost. Optimization is a best effort undertaken by planning various alternative methods of implementation, in order to obtain optimal timing of projects with optimum cost. Planning and scheduling are the backbone of the entire project, which is based on clear objectives. Microsoft Project as one of the scheduling software based on Precedence Diagram Method (PDM) provides many advantages, one of which scheduling can be done more quickly and thoroughly.In this research, it is created six alternative models as follows: In the first alternative ,it is acquired the project period of 256 days , at a cost of Rp2,190,234,913.43 ; In the second alternative , the was obtained the project period of 150 days , with a cost of Rp1,903,674,873.6 ; In the third alternative , it was obtained the project period of 102 days , at a cost of Rp1,873,215,897.61 ; In the alternative IV , it was obtained the project period of 99 days , at a cost of Rp1,895,159,526.12 ; In the alternative V , the project period was 96 days , at a cost of Rp2,019,623,191.13 ; In alternate VI , the project period was 89 days at a cost of Rp2,090,543,033.77. From the above calculation, then the result is interpolated in order to obtain the optimum time for the development project. The optimum time obtained is 120 calendar days, at a cost of Rp. 1,884,638,013.61.

EVALUATION OF PROJECT IMPLEMENTATION PERFORMANCE WITH EARNED VALUE METHODS Made Sudiarsa; I Gede Sastra Wibawa; I Ketut Sutapa
Logic : Jurnal Rancang Bangun dan Teknologi Vol 18 No 2 (2018): July
Publisher : Pusat Penelitian dan Pengabdian kepada Masyarakat (P3M) Politeknik Negeri Bali

Planning and controlling the execution of a project is part of the overall construction project management. In addition to assessment in terms of quality, achievement of a project can be assessed in terms of cost and time. Earned value method is the integrated cost control and project schedule. This method provides project performance status information in terms of cost and time in the project reporting period. In evaluating the performance of the development project of Villa Shimamoto Ryosaku, the performance of the cost aspect shows the savings from the plan, This is shown from the value Cost Performance Index (CPI) > 1 On monthly reporting3 = 1.39, the monthly 6 = 1.97, and the monthly 11 = 1.73 While the performance of the schedule aspect shows the delay of the plan, this is shown from the value Schedule Performance Index (SPI) < 1 on monthly reporting 3= 0.79,the monthly 6 = 0.93, and the monthly 11 = 0.94. Estimate Temporary Cost (ETC) is Rp 480,175,422.16, and Estimation At Completion (EAS) is Rp2,026,445,457.16, while Budgeted At Completion (BAC) is Rp3,502,000,000.00 so get Variance at Compeltioan (VAC) is Rp1,409,621,615.49 and Estimation Temporary Schedule (ETS) is 3.2 month, and Estimation At Schedul (EAS) is 14.2 Month while the time specified in the contract during 14 month, So the project is delayed during 0.2 month (1 week).

AGE AND COMPRESSIVE STRENGTH OF CONCRETE FROM VARIOUS BRANDS OF PORTLAND COMPOSITE CEMENT (PCC) I Wayan Intara; I Ketut Sutapa
Logic : Jurnal Rancang Bangun dan Teknologi Vol 18 No 2 (2018): July
Publisher : Pusat Penelitian dan Pengabdian kepada Masyarakat (P3M) Politeknik Negeri Bali

. Recently it is provided in the construction market several types of cement such as OPC (Ordinary Portland Cement), White Cement and most recently is PCC (Portland Composite Cement). The composition of PCC cement’s raw materials is Clinker, gypsum and additive materials. Additive materials used are limestone, fly ash and Trass. Unlike OPC type which does not use Fly Ash and Trass additives, in PCC it is used additives like Fly Ash and Trass where there is SiO2 compound that can increase the compressive strength. The research was carried out at the Laboratory of Civil Engineering Department of the Bali State Polytechnic using a cylindrical test object with size 15x30 cm of 20 pieces for each concrete age with a compressive strength of 25 MPa plan, tested at the age of 3, 7, 14, 21, 28, 56, and 90 days following PBI'71. The concrete strength of the concrete characteristics of the plan was achieved at the age of 56 days, with the value of the compressive characteristic of the plan reached at age 56 days with consecutive values of 25.82, 27.67, 26.80, 31.20 MPa and 28.81 MPa for Tonasa, Holcim, Bosowa, Merah Putih, and Tiga Roda cements. This value is greater than the value of compressive strength targeted based on the calculation of job mix design, in which it is 25 MPa. Conversion of Age and Compressive Strength Characteristics for the 5 (five) brands of PCC cement.

ANALYSIS OF ROASTING TEMPERATURE AND TIME EFFECTS TO THE QUALITY OF THE ROASTED SEEDS OF SIBETANESE SNAKE SKIN FRUIT Made Anom Adiaksa; Ketut Suherman
Logic : Jurnal Rancang Bangun dan Teknologi Vol 18 No 2 (2018): July
Publisher : Pusat Penelitian dan Pengabdian kepada Masyarakat (P3M) Politeknik Negeri Bali

Sibetan is one of the villages in Karangasem Regency. Snake skin fruit in this area has a peculiarity with the name of sugar snake skin fruit. Snake skin fruit plants are one of the seasonal plants, however the fruits also can be harvested in particular months. Dealing with the post-harvest handling for Sibetan Village area, it has been done a lot of product innovations such as making chips, pasta and raw materials of canned fruit sent to the outside of the island. The price for each kilogram of this snake skin fruit species is relatively expensive; it is up to Rp.15.000,00 when it is not in its harvest season, but during harvest season when there is abundant amount of this fruit, the price will be drastically reduced to Rp.500, 00 even unsold. This spurred the creativity of the community to process the snake skin fruit to be materials that have higher selling value. The existence of third parties who are interested to buy the flesh of the fruit as raw material to produce canned food makes the price of the fruit more stable; Rp.2.000,00 for each kilogram. However, this raises the amount of waste from snake skin fruit that has not been utilized, such as the seeds. One of the efforts done in many areas is to make them as raw materials for beverage. The test result obtained from roasting the seeds of snake skin fruit shows that temperature and time affect the quality of the roasted seeds, it can be seen from the colour and aroma compared to the roasted coffee beans. At 80 ° with a time of 40-50 minutes, the cinnamon category was obtained, the light category at 100 ° with 40-50 minutes of roasting, and the Frecnh category at 120 ° with 40-50 minutes of roasting.

THE EFFECT OF LCP ADDITION TO THE COMPRESSIVE STRENGTH OF NORMAL CONCRETE Budiman Budiman
Logic : Jurnal Rancang Bangun dan Teknologi Vol 18 No 2 (2018): July
Publisher : Pusat Penelitian dan Pengabdian kepada Masyarakat (P3M) Politeknik Negeri Bali

SNI 03-2847-2002, Concrete is a mixture of portland cement or other hydraulic cements, fine aggregate, coarse aggregate and water. The additives that form solid mass are optional. The aims of this study are to find out the effect of waste nugmet shell (LCP) toward the concrete characteristics, and to determine the compressive strength value of concrete characteristics. Variation of waste nugmet shell (LCP) toward the weight of cement is 0%, 0.25%, 0.50%, and 0.75%. This research is a sample-based laboratory research and analysis of aggregate characteristics and concrete compression test. The research result shows that the waste nugmet shell (LCP) into the concrete mixture affects the compressive strength value of concrete characteristics (fck’). It is proved by the compressive strength value of concrete which increased with the of waste nugmet shell (LCP) 0,25% and LCP 0,50% then decreased after the LCP 0,75%. The increase of fck’ value of the concrete characteristics after LCP 0.25% and LCP 0,50% is equal to 80.03 Kg/cm2 and 86.13 Kg / cm2. It means that there is an increase about 16.34% and 22,26%. The increase of concrete compressive strength value is quite significant if it is compared to non-LCP (normal concrete) with fck’ value about 66,95 Kg/cm2. Meanwhile, the decrease of fck’ value occurs in the proportion of LCP 0.75%, with the value of fck’ obtained t 64.56 Kg/cm2 at the age of 28 days.

TOPOGRAPHY & CROSS SECTION MEASUREMENT FOR CALCULATING THE COASTAL BORDER Gede Yasada; Ida Bagus Putu Bintana
Logic : Jurnal Rancang Bangun dan Teknologi Vol 18 No 2 (2018): July
Publisher : Pusat Penelitian dan Pengabdian kepada Masyarakat (P3M) Politeknik Negeri Bali

The coastal border is a land along of the shoreline, in which its wide is proportional to the shape and physical condition of the beach, at least 100 meters from the high water level towards the land. This research is based on the results of topography and cross section measurement work at Berawa Canggu Beach, Badung Bali, followed by calculation, drawing and reporting. The required data is the existing base data in the planned area in full to find the position of High Water Level in the field which will be used for the reference of the boundary limit for the coastal planning. The results obtained from this research are: the coastal border position is measured from BM W.3 along 55.1712 meters into the land of ownership and the coastal border position is measured from BM W.4 along 50.6926 meters into the land of ownership.

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