Background: In a batch production series consisting of several process stages for discrete products, the determination of the transfer batch size greatly affects the batch waiting time. For production using a Computer Numerical Control (CNC)-machining center, several process stages can be carried out on one machine with quick setup. The use of a single machine for all stages of the process certainly does not require transfer to the next machine. Thus, there are no material handling costs. However, the use of a single machine will result in longer batch waiting times as the production batch size increases. An increase in the batch waiting time will result in an increase in work-in-process (WIP) inventory cost. This research was conducted to reduce the total variable cost consisting of WIP inventory cost and material handling cost. Methods: This research was conducted in two steps. The first step is to divide the process stages, I into m serial CNC machining centers, where in this study I=m. The second step is to determine the same size of transfer batch, Qij for a certain number of transfers, J that produces the minimum total variable cost. Results: The results showed that J=5 resulted in a total variable cost of Rp. 146,800.00, while J=10 resulted in a total variable cost of Rp. 178,900.00. Conclusion: In conclusion, the total variable cost decreases if the size of transfer batch is reduced to a certain amount and will increase again along with the reduction in the size of transfer batch.
Abstract. PT. T is a company in Bandung engaged in the food sector. PT. T produces bread, pastries, sauces, tarts, cakes, and processed meats. PT. T sells production in stores (MTS strategy) and accepts consumer orders (MTO strategy). PT. T orders the same number of raw materials for each order—meanwhile, the raw materials used by PT. T is food raw materials that have characteristics with a certain shelf life. Based on the problems in PT. T, a procedure is proposed to determine the number of raw materials that must be prepared to reduce the Total Inventory Cost by considering the expiration date of raw materials in companies implementing a hybrid strategy. The procedure is to determine the Decoupling Point, calculate forecasting, prepare a Master Production Schedule (MPS), and calculate Material Requirement Planning (MRP). After calculating the proposed procedure, the Total Inventory Cost for the EOQ method is IDR. 224.225.833, and the Total Inventory Cost on the EOQ method, which considers expiration is IDR. 213.412.375. This shows that by using the proposed EOQ procedure and considering the expiration date, the company can reduce the Total Inventory Cost by IDR. 95.724.293. Abstrak. PT T merupakan perusahaan di Bandung yang bergerak di bidang makanan. PT T memproduksi roti, kue kering, soes, tart, bolu, dan daging olahan. PT T menjual hasil produksi di toko (strategi MTS) dan menerima pesanan dari konsumen (strategi MTO). PT T memesan bahan baku dalam jumlah yang sama untuk setiap pemesanan. Sedangkan bahan baku yang digunakan oleh PT T adalah bahan baku makanan yang memiliki karakteristik dengan umur simpan tertentu.Berdasarkan permasalahan di PT T, diusulkan prosedur untuk menentukan jumlah bahan baku yang harus disiapkan untuk menekan Total Inventory Cost dengan memperhatikan tanggal kadaluwarsa bahan baku di perusahaan yang menerapkan strategi hybrid. Prosedurnya adalah menentukan Decoupling Point, menghitung forecasting, menyusun Master Production Schedule (MPS), dan menghitung Material Requirement Planning (MRP). , dan Total Inventory Cost pada metode EOQ yang mempertimbangkan kadaluarsa adalah Rp 213.412.375 Hal ini menunjukkan bahwa dengan menggunakan prosedur EOQ yang diusulkan dan mempertimbangkan tanggal kadaluwarsa, perusahaan dapat menurunkan Total Inventory Cost sebesar Rp. 95.724.293.
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