Minimization of Makespan Using FCFS and Gupta Method Comparison in Machine Spare Part Industry

Abstract

Companies that produce spare parts for manufacturing industry machines are experiencing rapid development. The company produces production activities based on job orders where the process uses FCFS (First Come First Served) rules. Company scheduling often experiences delays especially on products have the same flow. The study was conducted to find the optimal sequence of scheduling with makespan minimization criteria using the Gupta Method and FCFS Method. The FCFS method used by the company produces makespan of 12.160,21 minutes = 202,67 hours. The recommendation method has a better level of performance compared to the company shown in efficiency index (EI) and relative error (RE). The EI value of the Gupta method is 1.14 which is indicates that the Gupta method has a good performance compared to the FCFS method. While the Gupta method RE value is 13,76%. The conclusion is Gupta method produces the minimum makespan value with a reduction of makespan of 178,15 hours. The Gupta method is a better method than FCFS method, which is shorter makespan, tardiness and flow time.