The Use of the Six Sigma Approach to Minimize the Defective Rate from Bending Defects in Hard Disk Drive Media Disks

Abstract:

The objective of this research is to reduce the defective rate from bending defects in media disks of hard disk drives by finding an optimal machine setting in the assembly process. The Six Sigma method was applied to find out the factors which statistically affected the bending value and to obtain the optimal setting of those factors. It was found that a minimal bending value was achieved with the setting of the clamp screw torque at 3.25 in-lb, the screw bit height at 3.00 mm., and the vertical force on the disk clamp and the motor at 2.50 lbs. With this optimal setting, the process capability index C_pk increased from 0.69 to 1.39, the mean bending value decreased from 5.12% to 3.43%, and the defective rate reduced from 32,219 ppm to 39 ppm.

• Periodical: Advanced Materials Research (Volume 974)
• Pages: 298-304
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.974.298
• Online since: June 2014
• Authors: Suthongchai Suriyasuphapong*, Napassavong Rojanarowan
• Keywords: Bending Defect, Clamping Distortion, Defect Reduction, Design of Experiment (DOE), Hard Disk Drive Media, Six Sigma

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