iSixSigma

Takt Time

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  • #50297

    Jabber
    Participant

    Forum,
    Is takt time always an element of a lean future state?  If overproduction is not an issue, does it still have a place?  For example, an intermediate processing center that must process everything delivered to it before a certain time frame…..it is not meeting this requirment and requires a collapsed lead time, but overproduction is not a concern…ie a service based operation that must process what it is given…Thank you!

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    #172859

    Damodaran
    Member

    Takt time is the maximum allowed time to process/produce a product/service.
    Takt time = Time Available in a unit (day/week/year) / Customer Demand in that same unit of time.
    Customer demand = 480 units per day, Available time = 480 minutes
    Takt time = 1 minute.
    It is not an element of a future state, it is simply the drumbeat that a particular service or station or processing center must produce to.
    You can compare your takt time against individual workloads and reorganize bottlenecks or constraints in your process to meet the takt time and hence satisfy your customer requirements. This seems to be the case with your processing center.
    Regards
     

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    #172867

    Ron
    Member

    TAKT time is seemingly the most misunderstood metric on the planet.
    TAKT time is the cadence of the process.. it represents the Cycle time divided by the customer demand. Its intent is to measure the efficiency of the production line that produce a certain part or assembly. It is then used to balance the work load so that each step in the porcess is at or below the TAKT time assuring a smooth transition to product realization based on customer demand.
    It is also used to define a flexible factory in which you can flex the workforce to meet the ever changing customer demand.
    The only involvment in a future state is to design  work steps or the number of personnel to consistantly make TAKT with the minimum of inventory or WIP.

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    #172972

    Sinnicks
    Participant

    It certainly is a misunderstood metric as stated by Ron. It is nothing to do with the cycle time of a process but is quite simply as stated by Sanjay Total Available Time divided by customer demand so is the rate at one part or service must be produced to satisfy the end customer.
    It can then used to identfiy any processes where the cycle time is outside of takt and these need immediate action to improve and bring them within takt

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    #172973

    Kannan
    Participant

    Also it is confused to be an effeciency measure over speed measure.
     

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    #172993

    Rhineg
    Member

    What do you mean “overproduction is not a concern”? Overproduction represents working capital investment, storage costs, and waste when your customer wants a shift in the product and you have to scrap the obsolete overproduced material.
    As you tune your process steps to match the takt time, there is less Work-In-Progress between process steps and less opportunity for the above waste.
    From a “service-based operation” what are your service providers doing productively between peak-demand periods? Is that other work (web-surfing, solitaire, …) providing bottom-line benefits?

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    #173005

    Chris Seider
    Participant

    Keep in mind there are some industries presently under capacity so overproduction is not a word in their present business model.
    Oil and some of the mining companies cannot meet demand.  Heck, even look at the corn producers in the US.
    I will grant you that intermediary steps within the above mentioned companies could have overproduction ahead of a bottleneck.

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    #173006

    BritW
    Participant

    TAKT time is not a measure of efficiency.  It is a cadence for producing to customer demand. Your process step may be able to produce at a rate of 100/hr, but the TAKT rate is 25, due to customer demand.  Not very efficient for a process that can produce 100/hr produce 25/hr.  This one reason why efficiency is not a very good measure for process effectiveness – see The Goal (Goldratt) for further reference.

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