Engineering Headway Vol. 6

Abstract: PT. XYZ is a company that produces plywood, which in the production process uses many machines and equipment that have high potential hazards if not controlled. Key performance indicator (KPI) is a performance indicator measuring a length, processing time, tool life, and a measure of performance needed. The method used to normalize the value is Snorm De Boer (SNORM), where the lowest value will be given a value of 0 and the highest value will be given a value of 100. The purpose of this research is to measure the OSH performance on the production floor of PT. XYZ and could provide improvement suggestions for OSH performance on the production floor at PT. XYZ based on the level of value obtained. The results: total value of OSH performance in rotary area is 21.00, press dryer area is 43.91, repair area is 60.59, glue spreader area is 56.61, cold press area is 47.08, hot press area is 55.76, sander calibration area is 48.57, sizer area is 69.86 and sander finish goods area is 84.25. The rotary area has the lowest OSH performance value because there is a process that has a high risk of work accidents but is not accompanied by OSH supporting facilities from the company. The proposed improvement of this research is cultivating the use of Personal Protective Equipment (PPE), administrative control which includes policies, SOP, safety sign, work and safety training, regular inspection and maintenance, and applicate 5S, also engineering control by creating a special soundproof room for machines with high noise levels.

Abstract: PT. Naturindo Fresh is a company that produces and distributes original Indonesian herbal medicines. The company does not have a planned schedule to minimize the total production time. The production is carried out by considering the products stock and the number of orders from consumers. The employees are free to randomly choose which products will be produced first. The purpose of this research is to determine the job sequence and calculating the total production time (makespan), and identify the sequence that create smallest makespan. The methods used in this research are Campbell, Dudek, & Smith (CDS) method, Palmer method, and Dannenbring method. The calculation results shows that the company's actual scheduling produces a makespan of 30,725.08 minutes. The result of CDS method produces the makespan of 30,634.18 minutes. Palmer's method produces the makespan of 30,743.75 minutes, and the Dannenbring method also yield the makespan of 30,743.75 minutes. In conclusion, the job scheduling with CDS method has the smallest makespan which is recommended to be applied in the company to minimize the total production time.

Abstract: Due to the good potential of Holzewig products, which resemble the function of wood, PT. Pracetak Bangun Indonesia plans to make finished products ready for use by the general public. Because there are several constraints in the production process, such as product design, the product manufacturing process, and the assembly process, planning and design processes are needed. one that can be used to make production process choices, namely the Design for Manufacture and Assembly (DFMA) and Activity-Based Costing (ABC) methods for calculating the cost of production. By using the DFMA method to find proposals for the production process, the process of making a design proposal is not much different from the process of making a set of chairs and a dining table made of wood; it's just that there are some differences due to the different materials used, so that the types of tools and assembly materials are different. The cost of goods sold obtained for making a set of chairs and tables consisting of 2 chairs and 1 table is 987,333.73. Holzewig material can be used in place of wood as an alternative for furniture products because its overall weighing value is just 0,001 less than that of wood.

Abstract: The XYZ company is engaged in the production of construction materials such as Ready-Mix Concrete (RMC). XYZ company must increase productivity in order to compete with the industry’s rapid expansion in Banyumas, Indonesia. Scheduling production is one of the methods for boosting productivity. Utilizing a mathematical model and a single-machine approach, scheduling is arranged. Using a product delivery system that is integrated with the production process, a production scheduling model and allocation of product delivery vehicles, the Truck Mixer, are developed. The Genetic Algorithm is used to find a more effective scheduling solution. The results of this study indicate that the schedule generated by the genetic algorithm has a total reduction of ten job sequence completion times of 134363 seconds or 24% more efficient than the existing schedule on average.

Abstract: Bakpia is made from green beans and sugar wrapped in flour. Bakpia Latief Kediri is a bakpia industry in the City of Kediri. The company needs help in the production process activities. There are still products that need to be fixed. The types of it defects in the company are burnt and cracked. This study aimed to determine the performance of its quality control, determine the most dominant types of defects in its products, and provide suggestions for improving its production process. The research method uses the Statistical Quality Control method. Data is taken in the form of primary data and secondary data. Primary data was collected by interview and observation. Interviews were conducted using in-depth interviews. Observations were made for 30 days. Data analysis uses statistical tools, which include check sheets, histograms, fishbone diagrams, Pareto diagrams, and control charts p. Bakpia quality control at Bakpia Latief is under control because the p chart control chart shows that only one point is out of the control limits. The most dominant defect in its products is burnt, with an average percentage of 0.617%. Corrective actions to reduce the existence of defective products, namely repairing and maintaining production machines, improving the stages of the production process, developing human resources, and repairing production facilities. Keywords: Product Defects, Quality Control, Statistical Quality Control

Abstract: In order to have a good workspace design, it takes a series of activities consisting of several stages. Starting from the design planning stage, design testing/ experimentation, design analysis, selection of the best design, to design implementation. This research was conducted to evaluate workspace designs using the Taguchi method. In this study, four factors were determined as elements of the workspace environment: the level of lighting, noise, temperature, and aroma of the room. Taguchi orthogonal array design produces 8 experiments obtained from a combination of 4 factors and 2 levels. Experimental activities in the form of the influence of the physical work environment on the resulting typing speed. The research sample in each experiment was 30 responses. The experimental results were analyzed using the Taguchi method with the help of Minitab software. In the analysis of the larger the better factor, based on the ranking, it is found that three factors have amajor influence on typing speed: lighting using room lights, not adding sound (noise), and regulating the room temperature to keep it cool. The ANOVA results show that lighting, noise, and temperature factors significantly affect typing speed. It is known that the calculated F value of the lighting factor is 42.10, noise is 12.22 and temperature is 14.45, all of which are greater than the F table of 4.07. The results of this study can be used as managerial evaluation material for companies to design workspaces by prioritizing bright lighting, not too noisy, and cool temperature of room.

Abstract: UD XYZ is a small and medium enterprise (SME) that produces printed brown sugar. In fulfilling customer demands, this SME produces sugar using a make-to-order system. Based on initial observations, indications of bottlenecks were found in the production process. The indications of bottleneck were found in the cooking process as this process is repeated and takes a long time. The prolonged cooking process results in the subsequent process stopping because there are no products to process. In addition, signs of bottleneck also occurred in the printing process, which takes a long time. After identification, the bottleneck occurred at workstation 4 where the cycle time at workstation 4 exceeded the production takt time. The bottleneck caused the company to experience delays in meeting production targets. To improve the bottleneck problem, workstation balancing was done using the rank positional weight method. The RPW method is a heuristic method that has advantages in terms of performance and is easy to apply to real problems. The results of the improvement were then simulated using Extend software. Line balancing with the RPW method resulted in 2 proposed workstation allocations. The first proposal divides the workstations into 5 workstations with idle time calculation results of 157.3 minutes and line efficiency of 65%. The second proposal divides the workstations into 5 workstations with idle time calculation results of 57.31 minutes and line efficiency of 84%. Based on the simulation results, no bottleneck was found in both proposals, with the first proposal producing an average output of 3.7 batches while the second proposal producing an average output of 4.1 batches. The recommended improvement proposal is to allocate workstations according to the second proposal.

Abstract: This study used the set covering problem (SCP) method to optimize the placement of F-16 Fighting Falcon fighters in the national air defense system (Sishanudnas). Then the results of the SCP maximized the covering capability by minimizing the average distance between air bases with the P-Median Problem (PMP). The results of this study show that the Air Force needs nine F-16 squadrons, to be able to cover all Indonesian airspace. However, if the requirements must include Air Bases that currently operate fighters as squadron deployment sites, the Air Force needs 11 squadrons of F-16 aircraft.

Abstract: To maintain its competitiveness, the Indonesian CPO industry must apply lean techniques such as value stream mapping (VSM) that can be utilized to increase the process efficiency. While there have been several studies which attempted to apply VSM techniques to the CPO industry, the results of these studies have not been summarized and compared. This paper aims to summarize the findings of previous VSM studies in Indonesian CPO industry and provide the directions for future researches. In this study, the brief literature review is applied in which the relevant articles are reviewed according to the scope of study, approach or method, and types of identified wastes. Various types of wastes found from the initial stage (FFB reception) to the final stage (CPO storage). The average process cycle efficiency score indicates the requirements for improvement actions. Recommendations for future VSM researches include the scope of the process stages studied, process mapping for future condition, and the requirements of green and sustainability aspects.

Abstract: Determining a location where facilities will be built is one of the important factors in both business and military planning processes. Indonesia, as a country with a large area, has problems in determining the right location to place its fighter squadrons in the national defense system. This study used the Analytic Hierarchy Process (AHP) to solve the problem. There are five criteria considered in this study, there are deterrence strategy, balance strategy, aviation support facility, base support facility and environment. The study is aimed at obtaining six of the 10 Air Force air bases eligible for deployment of fighter squadrons. The six selected candidates were “C” (15.17%), “A” (15.16%), “F” (12.25%), “B” (12.16%), “E” (10.09%) and “D” (10.07%).