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All Journal Jurnal Ilmiah Teknik Mesin & Industri (JITMI) JURNAL INOVASI TEKNIK INDUSTRI
Siregar, Ninny Asnidar
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Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Engineering Industrial & Manufacturing Engineering Mechanical Engineering

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Penerapan Lean Manufacturing Untuk Meminimasi Pemborosan Pada Bahan Baku Kerangka Sofa di UD. Sofa Bandar Tinggi Damanik, Ricky Prayuda; Siregar, Ninny Asnidar; Polewangi, Yudi Daeng
Jurnal Ilmiah Teknik Mesin & Industri (JITMI) Vol 2, No 2 (2023): Jurnal Ilmiah Teknik Mesin & Industri (JITMI), November
Publisher : Universitas Medan Area

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31289/jitmi.v2i2.2792

Abstract

UD. Sofa Bandar Tinggi is an UMKM in the manufacturing sector with sofa production. In producing sofas in the production process there is still waste. The wastage that occurred in the last year was as much as 17 sets of overproduction, 17 sets of unnecessary inventory, 22 sets of defects and 45 minutes of waiting time. Therefore, it is necessary to identify waste and analyze the causes of this waste to increase productivity by implementing lean manufacturing in the sofa production process using value stream mapping to determine product flow and information flow that support other activities and also to eliminate waste and find the causes of this waste by fishbone diagrams. Based on the current value stream mapping results, the lead time is 109.63 minutes, the value added is 94.21 minutes. After the process activity mapping was carried out, the current stream mapping future state results showed that the lead time decreased to 98.26 minutes. And also the translation of a problem from the fishbone diagram, namely the man factor (lack of discipline, low skill of workers), measurement (repeated wood cutting), method (uneven wood pieces), material (inappropriate wood thickness). The recommendations for improvement to minimize waste are in the form of Standard Operation Procedures and implementing 5S.
METODE ECONOMIC ORDER QUANTITY (EOQ) SEBAGAI ALAT KONTROL PENGENDALIAN PERSEDIAAN BAHAN BAKU KERIPIK PISANG DI UKM BANATABO Prasetyo, Healthy Aldriany; Tambunan, Sahabat Petrus; Zulvatricia, Reakha; Siregar, Ninny Asnidar
Jurnal Inovasi Teknik Industri Vol 4, No 1 (2025): JURNAL INOVASI TEKNIK INDUSTRI
Publisher : Lembaga Penelitian dan Pengabdian Masyarakat Universitas Muhammadiyah Gombong

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26753/jitin.v4i1.1654

Abstract

Failure to control raw material inventory will result in failure to obtain profits. Banatabo UKM's supply of raw materials for banana horns has not been optimized because it only uses predictions based on experience without carrying out economic analysis calculations which results in over stock, affecting the quality of raw materials, and causing over budget. The aim of the research is to optimize control of the supply of raw materials for horn bananas through calculating the Economic Order Quantity (EOQ) method. The research method is a quantitative method through raw material inventory data, storage and ordering costs at Banatabo UKM. The results of the research are that the optimal amount of raw material purchased using the EOQ method is 290 kg per order. Actually, Banatabo UKM purchases 101 kg of raw materials for each order. The optimal frequency of purchasing raw materials using the EOQ method is 17 times and the actual data for UKM Banatabo is 48 times. Through the EOQ method, raw material inventory costs are Rp. 974,372 every month while the actual data for UKM Banatabo is 1,568,492 every month so the savings is IDR. 594,120 or as much as 38%. Because previously UKM Banatabo had not implemented safety stock (safety inventory) and reorder points (reorder points), UKM Banatabo had to maintain a safety stock of 33 kg and a reorder point of 79 kg to facilitate the continuity of ales cycle. 
Co-Authors Damanik, Ricky Prayuda Polewangi, Yudi Daeng Reakha Zulvatricia Tambunan, Sahabat Petrus