PERBAIKAN KUALITAS STASIUN KERJA MESIN BUBUT PADA PT. DIRGANTARA INDONESIA DENGAN METODE SIX SIGMA

• Main Author: Nadira Ramadhani, Nisa
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/53977
• Institution: Institut Teknologi Bandung

PT Digantara Indonesia (DI) has a division, in charge of making aerospace parts regularly, namely detail parts manufactuing (DPM). Based on PT DI’s data, reject rate of DPM in last 3 years were above the target, which is 0,5%. Therefore, further experiment should be conducted on the area that contributed to the reject area, such as lathe machine. This experiment recommend six sigma method with DMAIC approach (Define, Measure, Analyze, Improve, Control) to elaborate on improvements in lathe machine area. In the define step, types of defects were determined. In the measure step, process stability was determined with control chart and process capability was calculated. In analyze step, root causes were determined with the usage of cause & effect diagrams and 5 whys, and FMEA (Failure Mode Effect & Analysis). In improve step, recommendation solutions from determined root causes are determined. In control step, recommendation for hold in the solution was made The type of defects that needed to be solved are undersize and damaged. Then, the result of measure step were lathe machine process is in stable condition and the result of process capability was 3,38 sigma. Then, from the result of analysis, root causes are determined. There are 1) cutting condition table had not been created, 2) other measuring tools comparison had not been created, 3) method for checking cutting tools before using it had not been created, 4) guide of machine usage for operator had not been made, and 5) standard method of setting & media for checking after setting had not been made. Then, the solution for those root causes are 1) making a cutting condition usage table, 2) making a measuring tool usage table, and 3) a standard operating procedure (SOP) of lathe machine.