A product requires two sequential machine operations. The first takes 3.5 minutes and the defect percentage is 12. The second takes 6 minutes and the defect percentage is 7.
• Assuming factory operates 250 days/ year; a daily shift of 10 hours.
• Find the machine fraction for each if we need to manufacture 50,000 units per year.
• History shows production takes 2198 hours due to setup and 2052 hours due to machine unavailability (maintenance needs)