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Overall Equipment Effectiveness

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KAILAS SREE CHANDRAN CLASS: S7 INDUSTRIAL 432 Guide: V REGIKUMAR

OVERALL EQUIPMENT EFFECTIVENESS

OEE

MODERN APPROACH TO

OVERALL EQUIPMENT EFFECTIVENESS

OEE

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 Loss due to breakdown of equipment.  Loss is more than 10 minutes.  Biggest of SIX BIG LOSSES.
 Tooling Failures  Unplanned Maintenance  General Breakdowns

 Equipment Failure

 The time lost due to adjustments
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in the equipment.  Loss is less then 10 minutes.
 Setup/ Changeover

 Material Shortages
 Major Adjustments

 Small stops losses occur when equipment

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stops for a short time as a result of a temporary problem.  These includes stops that are under ten minutes.
 Component Jams  Misfeeds

 Sensor Blocked
 Delivery Blocked  Cleaning/ Checking

 Reduced speed refers to the
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difference between Design speed and Actual Operating speed.
 Under Nameplate Capacity  Under Design Capacity  Due to Equipment Wear  Due to Operator Inefficiency

 Some equipments require warm10

up time and certain adjustments to obtain optimum output. Startup rejection occurs during this startup time.  Scrap  Rework

 These losses occurs when products

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produced are not conforming to the specifications.  These are rejects during steady-state production.  Scrap  Rework

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 The amount of time the facility is open and
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available for operation.  One year consists of 365 days, one day consists of 24 hours, 60 minutes in one hour, 60 seconds in one minute.  PLANT OPERATING TIME = Fully Productive Time + Quality Loss + Speed Loss + Downtime Loss + Planned Shutdown

PLANT OPERATING TIME
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PLANNED PRODUCTION TIME OPERATING TIME NET OPERATING TIME
FULLY PRODUCTIVE TIME
QUALITY LOSS SPEED LOSS
DOWNTIME LOSS

PLANNED SHUTDOWN

OEE FACTORS
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 Availability represents the percentage
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of scheduled time that the equipment is available to operate.  Availability takes into account Down Time Losses. AVAILABILITY = Operating Time Planned Production Time

 Performance represents the speed at
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which the equipment runs as a percentage of its designed speed.  Performance takes into account Speed loss. PERFORMANCE = Net Operating Time Operating Time

 Quality represents the Good units
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produced as a percentage of the Total units produced. QUALITY = Fully Productive Time Net Operating Time

PERFORMANCE =Actual Run Rate/ Ideal Run Rate

AVAILABILITY= Operating time/ Planned Production Time

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QUALITY= Good Pieces/ Total Pieces

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OEE= AVAILABILITY X PERFORMANCE X QUALITY
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Availability = Operating Time / Planned Production Time Performance = (Total Pieces / Operating Time) / Ideal Run Rate Quality = Good Pieces / Total Pieces

 This method use computers for
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accessing inputs, calculating OEE and its analysis.  E.g.: OEE IMPACT, VISUAL OEE, OEE TOOLKIT, PROVIDEAM etc.
 Spreadsheets  System Software

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o Shift Length: 8 Hours o Tea Breaks: 10 Minutes x 2 o Meals Break: 1 Hour o Downtime: 10% of shift o Idle Runrate: 5 pieces/minute (Cycle

time=0.2min/pieces) o Total Pieces Produced: 1600 o Rejected Pieces: 52

OEE= Availability x Performance x Quality
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Availability = Operating Time/ Planned Production Time Planned Production Time = Plant Operating Time – Planned Shutdown Plant Operating Time= 8 hours x 60 = 480 min. Planned Shut down = Tea break + Lunch Break = (10x2) + 60 = 80minutes.

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Planned Production Time = 480-80 = 400 min. Operating Time = Planned Production TimeDowntime Loss = 400-48 = 352 minutes. Availability = 352/400 = 0.88 Performance = (Total Pieces / Operating Time)/ Idle Run Rate = (1600/352) / 5 = 0.9091 Quality = Good Pieces / Total Pieces = (1600-52) / 1600 = 0.9675

OEE = 0.88 x 0.9091 x 0.9675 = 0.774 OVERALL EQUIPMENT EFFECTIVENESS = 77.4%

OVERALL EQUIPMENT EFFECTIVENESS (EXCEL CALCULATOR)
Production Data Shift Length Short Breaks Meal Break Down Time Ideal Run Rate Total Pieces Reject Pieces 8 2 1 48 5 1,600 52 Hours = 480 Minutes Breaks @ 10 Minutes Each = Breaks @ 60 Minutes Each = Minutes PPM (Pieces Per Minute) Pieces Pieces

20 Minutes Total 60 Minutes Total

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Support Variable Planned Production Time Operating Time Good Pieces

Calculation Shift Length - Breaks Planned Production Time - Down Time Total Pieces - Reject Pieces

Result 400 Minutes 352 Minutes 1,548 Pieces

OEE Factor Availability Performance Quality Overall OEE

Calculation Operating Time / Planned Production Time (Total Pieces / Operation Time) / Ideal Run Rate Good Pieces / Total Pieces Availability x Performance x Quality

OEE% 88.00% 90.91% 96.75%

77.40%

OEE Factor Availability Performance Quality Overall OEE

World Class OEE

OEE% 88.00% 90.91% 96.75%

90.00% 95.00% 99.90%

85.00% 77.40%

 World class OEE is a standard which is used to

compare the OEE of the firm.
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OEE Factor
Availability
Performance Quality Overall Equipment Effectiveness

WORLD CLASS
90%
95% 99% 85%

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PLANT OPERATING TIME PLANNED PRODUCTION TIME
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PLANNED SHUTDOWN

OPERATING TIME RUNNING TIME
NET OPERATING TIME
FULLY PRODUCTIVE TIME

DOWNTIME LOSS

STOPTIME LOSS
SPEED LOSS

QUALITY LOSS

 Usability takes into account Stop Time
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Loss.

USABILITY = Running Time Operating Time

OEE
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Availability

Usability

Performance

Quality

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o Shift Length: 8 Hours

o Tea Breaks: 10 Minutes x 2 o Meals Break: 1 Hour
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Downtime Loss of 48 minutes (10% of Shift)

o Warm-up Time: 20 minutes

o Equipment Breakdown(Tool Failure): 28 min. o Idle Runrate: 5 pieces/minute (Cycle

time=0.2min/pieces) o Total Pieces Produced: 1600 o Rejected Pieces: 52

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Availability = Operating Time/ Planned Production Time Planned Production Time = 400 minutes Operating Time = Planned Production TimeBreakdowns = 400-28 = 372 minutes. Availability = 372/400 = 0.93 Usability = Running time / Operating Time Running Time = Operating Time – Warm-up Time = 372-20 = 352 minutes. Usability = 352 / 372 = 0.9462

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Performance =(Total Pieces / Operating Time) / Idle Run Rate = (1600 / 352) / 5 = 0.9091 Quality = Good Pieces / Total Pieces = (1600-52) / 1600 = 0.9675 OEE = Availability x Usability x Performance x Quality

OEE = 0.93 x 0.9462 x 0.9091 x 0.9675 = 0.774

Modified OVERALL EQUIPMENT EFFECTIVENESS = 77.4%

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 Anil S. Badiger, ‘A proposal: evaluation of

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OEE and impact of six big losses’, Int. J. Process Management and Benchmarking, Vol.2, No. 3, 2008, pp 234-248.  Ravikumar M. M., ‘Improving Equipment Effectiveness’, Int. Business Management, Vol. 3, No.2, 2008, pp 91-96.  www.bestmanagementarticles.com  www.maintenanceworld.com

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