8/22/2019 Md. Imrul Kaes - OEE Problem

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OEE Formulas:

Availability = Operating Time Planned Production Time

Performance = Ideal cycle Time Actual Cycle Time

Actual Cycle Time = Operating Time Total pieces produced

Ideal run time = 1 Ideal cycle time

Quality = Good pieces Total pieces produced

OEE = Availability x Performance x Quality x 100%

Example 1:

Shift length: 8 hours

Short breaks: 2 @ 15 minutes

Meal break: 1 @ 30 minutes

Downtime: 47 minutes

Ideal runtime: 60 pcs per minute

Total pcs produced: 19,271 pcs

Reject pcs: 423 pcs

Calculate OEE of that shift.

Solution:

8/22/2019 Md. Imrul Kaes - OEE Problem

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Here, sift length = Plant operating time = 8 x 60 mins =

480 mins

Planned shut down time = 2 x 15 + 30 mins = 60 mins

Planned production time = plant operating time Planned shutdown time

= 480 60 mins = 420 mins

Down time loss = 47 mins

Operating time = Planned production time Down time loss

= 420 47 mins = 373 mins

Good pcs = Total pcs Rejected pcs

= 19271 423 pcs

= 18848 pcs

Availability = Operating Time Planned Production

Time

= 373 mins 420 mins = 0.88

Ideal cycle time = 1 Ideal run time

= 1 60 pcs per min = 0.0166 min per pcs

Actual Cycle Time = Operating Time Total pieces

produced

= 373 mins 19271 pcs = 0.0193 min per pc

Performance = Ideal cycle Time Actual Cycle Time

= 0.0166 0.0193 = 0.8576

Quality = Good pieces Total pieces produced

=18848 pcs 19271 pcs = 0.9780

OEE = Availability x Performance x Quality x 100%

=0.88 x 0.8576 x 0.9780 x 100%

8/22/2019 Md. Imrul Kaes - OEE Problem

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=0.7381 x 100% =73.81% (ANS)

Example 2:

Shift length: 10 hours

Short breaks: 2 @ 10 minutes

Meal break: 1 @ 1 hour

Downtime: 69 minutes

Ideal runtime: 120 pcs per hour = 120 60 = 2 pcs per min

Total pcs produced: 771 pcs

Reject pcs: 70 pcs

Calculate OEE of that shift.

8/22/2019 Md. Imrul Kaes - OEE Problem

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Solution:

Here, Sift length = Plant operating time = 10 x 60 mins =

600 mins

Planned shut down time = 2 x 10 + 60 mins = 80 mins

Planned production time = plant operating time Planned shut

down time

= 600 80 mins = 520 mins

Down time loss = 69 mins

Operating time = Planned production time Down time loss

= 520 69 mins = 451 mins

Good pcs = Total pcs Rejected pcs

= 771 70 pcs

= 701 pcs

Availability = Operating Time Planned Production

Time

= 451 mins 520 mins = 0.867

Ideal cycle time = 1 Ideal run time

= 1 2 pcs per min = 0.50 min per pcs

Actual Cycle Time = Operating Time Total pieces

produced

= 451 mins 771 pcs = 0.5849 min per pc

Performance = Ideal cycle Time Actual Cycle Time

= 0.50 0.5849 = 0.8548

Quality = Good pieces Total pieces produced

=701 pcs 771 pcs = 0.909

OEE = Availability x Performance x Quality x 100%

8/22/2019 Md. Imrul Kaes - OEE Problem

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=0.867 x 0.8548 x 0.909 x 100%

=0.676 x 100% =67.62% (ANS)