How did Shift Up's new clutch design result in a 20% higher defect rate compared to the previous model?

Introduction

Shift Up's new clutch design has resulted in a 20% higher defect rate compared to the previous model, indicating a significant quality control issue. This analysis will systematically investigate the root cause of the increased defect rate, considering both internal and external factors that may have contributed to this problem.

Step 1

Clarifying Questions (3 minutes)

• Looking at the timing, I'm thinking there might be a correlation between the new design implementation and the defect rate increase. When exactly was the new clutch design introduced?

Why it matters: Establishing a timeline helps identify potential external factors or internal changes that coincided with the defect rate increase. Expected answer: The new design was implemented about 3-6 months ago. Impact on approach: A recent implementation would focus our investigation on recent changes, while a longer timeframe might suggest gradual degradation or external factors.

• Considering the magnitude of the increase, I'm wondering about the specific nature of these defects. What types of defects are we seeing with the new clutch design?

Why it matters: Understanding the defect types can point to specific areas of the design or manufacturing process that may be problematic. Expected answer: The defects are primarily related to premature wear or failure under normal operating conditions. Impact on approach: This would guide our investigation towards material selection, design tolerances, or manufacturing processes specific to wear-resistant components.

• Given that this is a new design, I'm curious about the testing process. Was there any change in the quality control or testing procedures when the new design was implemented?

Why it matters: Changes in quality control could explain the increased defect rate if issues are being caught that were previously overlooked. Expected answer: No significant changes were made to the quality control process. Impact on approach: This would shift our focus to the design and manufacturing stages rather than the testing phase.

• Considering the complexity of clutch systems, I'm thinking about potential supplier changes. Have there been any changes in suppliers or components used in the new clutch design?

Why it matters: New suppliers or components could introduce variability or incompatibility issues. Expected answer: There was a change in the supplier for one of the key components. Impact on approach: This would lead us to investigate the new supplier's quality control processes and the compatibility of their components with the overall design.