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OEE calculation for line with more than 1 tact

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Viewing 8 posts - 1 through 8 (of 8 total)
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  • #23751

    Yibra
    Member

    Hello,
    I am trying to calculate OEE and I have a question. In any calculation template I saw, the determination of the Ideal Run Rate of a line (that’s how many pieces it assemble per minute /PPM/) is considered if I manufacture products that have the tact of production. But what if I have an assembly line that assemble more types of products within 1 shift with different Ideal Run Rate?
    For example: Within 1 shift (8 hours) I will assemble 2 hours product type A with ideal Run Rate of 60 PPM, then 3 hours type B with Ideal Run Rate of 40 PPM and 1 hours with type C of ideal run rate 80 PPM). How can I calculate the Ideal Run Rate if the ration between type A : type B : type C is not constant? Sometimes I only assemble type A or B&C.
    Does anybody know a simple method to caluclate the OEE for such a line?
    Thanks alot.

    0
    #56830

    Paul Gibbons
    Participant

    Yibra,
    The easiest way is to have a different OEE table for each product made during that shift. From this you will also be able to see, from the failure modes, if there is any correlation between the different products produced and your OEE level.
    To gain the overall OEE for the whole shift I would take the average % of the performance element and calculate the other elements based on your actual numbers to get an overview. I have used this approach successfully.
    Here is your example using my approach……
     

    Product

    A
    B
    C
    Total

    Base Hours
    Standard minutes available
    120
    180
    60
    360

    Planned Downtime
    0
    0
    0
    0

    Loading Time
    120
    180
    60
    360

    Availability
    Waiting setter
    0
    0
    0
    0

    Maintenance
    0
    0
    0
    0

    No Programme
    0
    0
    0
    0

    No Operator
    0
    0
    0
    0

    Waiting Material
    0
    0
    0
    0

    Waiting Toolroom
    0
    0
    0
    0

    Total Downtime
    0
    0
    0
    0

    Running Time
    120
    180
    60
    360

    Downtime Efficiency
    100%
    100%
    100%
    100%

    Performance
    Output (total parts made)
    120
    80
    70
    270

    Cycle Time (minutes)
    1
    1.5
    0.75

    Performance Efficiency
    100%
    67%
    88%
    85%

    Quality
    Quality Test Sample
    0
    0
    0
    0

    Total lost for Quality Reason
    0
    0
    0
    0

    Purity
    100%
    100%
    100%
    100%

    OEE
    Overall Equipment Efficiency
    100%
    67%
    88%
    85%

     
    Paul

    0
    #56831

    Yibra
    Member

    Thanks alot Paul. I thought it could be calculated that way, but I wanted another opinion. I’ll try to calculate it that way. Thanks alot.
    Kamil

    0
    #56853

    Eugenio Quintero
    Participant

    Hope this helps….
    Eficiency by =  S[cycle std/pz 1 ][Production Total 1 ] +  + [cycle std/pz n ][Production Total n ]
    machine                                       S Uptime 1-nƒn
     
    Eficiency by =  ƒn[cycle std/pz  ][Production Total ]
    product                        Uptime
     
    FTQ        =      Sƒn[Good Parts1 ] + ¡K. + [Good Partsn ]
    machine          S [Good parts+ Scrap + Rework] 1-nƒn
     
    FTQ by =             ƒn             [ Good Parts ]
    product             Good Parts + Scrap + Rework
     
     
    Availability =         Sƒn[Uptime 1 ] + ¡K. + [Uptimen ]
    by machine              S [Uptime+ Downtime] 1-nƒn
     
    Availability =             ƒn[ Uptime ]
    by product              Uptime+ Downtime
     

    0
    #56866

    Andrew Rice
    Participant

    Hi there,
    The simplest way to calculate the OEE would be as follows
    Calculate the Ideal Time for each product (say in minutes):
    ((Good Units A)/Ideal Rate A) + ((Good Units B)/Ideal Rate B) + ((Good Units C/Ideal Rate C) = Ideal Time
    In your example the above will be in minutes
    8 hours = 480 minutes = scheduled time
    OEE Rate = Ideal Time / Scheduled Time as a percentage.
     
     

    0
    #57464

    Arusei
    Participant

    The best way is to set your machine Oee Calculation on your most produced product then when you change over to another product use a conversion factor based on the cycle times of the two products. If you still dont understand I may provide an example next time

    0
    #57594

    Burns
    Member

    The best way to calcuate an Ideal cycle time with multiple part numbers is to use a waited average. If you have any questions please feel free to contact via email. [email protected]

    0
    #57723

    Anoop
    Participant

    Can OEE concept be applied on manual Assembly lines. If yes, then how to monitor in case of Multi-models having different Standard Times & ratio also varies on daily basis leading to variation in Takt Time.

    0
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