Question

A machine is available 10 hours a day. Each part takes 80 minutes to fabricate and 10 minutes to setup. 10% of the parts made are defective and must go through the machine again to be reworked, during which both setup and fabrication have to be performed again. The machine is idle for any unused time. On average, 5 good parts are made each day. What is the overall equipment effectiveness of the machine? Multiple Choice 0.80 0.75 0.067 0.667

Answer 1

The overall equipment effectiveness of the machine is 0.75

How to determine the effectiveness?

The given parameters are:

• Availability = 10 hours ⇒ 600 minutes
• Fabrication time = 80 minutes
• Setup time = 10 minutes
• Parts made each day = 5
• Percentage defective = 10%

The total production time for 5 parts is:

Time = 5 * (80 + 10)minutes

Time = 450 minutes

The time to replace defective parts is:

Time = Percentage defective * Parts made each day * Production time for one part

This gives

Time = 10% * 5 * (80 + 10) minutes

Time = 45 minutes

The value added time is the difference between the production time and time to replace defective part

Value added time = 500 - 45 = 455 min

The overall equipment effectiveness of the machine is then calculated as:

OEE = Value added time/Availability

This gives

OEE = 455/600

Evaluate

OEE = 0.75

Hence, the overall equipment effectiveness of the machine is 0.75

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