QUALITY IMPROVEMENT PROPOSAL FOR TNC UNIVERSAL MILLING WORK STATION AT INDONESIAN AEROSPACE LTD. USING SIX SIGMA METHODOLOGY

• Main Author: Michella Esther C, Amadea
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/70433
• Institution: Institut Teknologi Bandung

Dirgantara Indonesia Ltd. is a state-owned company whose main activity is producing aircraft component. TNC Universal Milling is one of work stations that actively produces aircraft component. In 2019, the average of defective product that is produced by this station reached 0,65%. It is higher than the target percentage of defect set by the company. This research proposed Six Sigma metodology with DMAIC (Define-Measure-Analyze-Improve-Control) approach to elaborate improvements that can be made at TNC Universal Milling. Six Sigma project formulation, production process observation, and identification of the type of defective product are done in the define step. In measure step, it is found that the process is stable. The sigma level in the capability process is 3.92. Problem maping to determine the type of defects to be analyzed further and root cause analysis is carried out in analyze step. The selected type of defects are incorrect, damaged, and undersize. Then, the root causes of the problem are assessed with FMEA (Failure Mode and Effect Analysis) method to determine the priority of the problem root causes to be solved. At the improve step, a proposed solutions are designed. At the control step, documentation of improvements is carried out. Some of the root causes to be solved are 1) there is fatigue factor so that the operator concentration decreased, 2) the operator unconsciously presses the wrong axis control button, 3) the caliper is pressed by chance during measurement, 4) position of the cutting tool in the caliper is not precise, and 5) the collet wrench is not rotated maximally. The proposed solutions were 1) measuring operator fatigue level before working, 2) giving name labels to the axis control buttons, 3) providing laser diameter measuring instrument, and 4) providing collet torque wrench.