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Process, Cycle, Lead Time

Six Sigma – iSixSigma Forums Old Forums General Process, Cycle, Lead Time

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  • #53139

    jpbeme
    Participant

    Trying to get process, cycle, and lead times straight. However, it’s all getting a little jumbled. Using the scenario given, could someone explain what the process, cycle and lead times would be?Scenario:
    There are three positions where work is done, with one operator at each position.
    Each operator works in batches of five widgets.
    It takes five minutes to process each widget at each position.
    There is 30 minutes of wait time between each position.Much appreciated.

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    #188420

    MBBinWI
    Participant

    Sorry, Dude/Dudette.  Get someone else to do your homework.

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    #188516

    jpbeme
    Participant

    This isn’t my homework, that was quite rude and a false assumption on your part. Forgive me for thinking this was a good forum to find help. I’m looking to verify I know how to calculate these numbers correctly. Definitions to these terms only go so far. I’m trying to learn how to apply them to an actual scenario.If anyone more helpful can reply, it would be much appreciated.

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    #188517

    Mikel
    Member

    Yea right.Lying will not help your cause

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    #188518

    Stewart
    Participant

    Since your scenario reads JUST like a Homework problem here are some text-book EXPLAINATIONS (definitions) to what you are trying to get straight:
     
    Process – A series of steps or actions that produces a completed order or product.
     
    Lead Time – Time it takes to complete an activity from start to finish; it includes batch and process delays.
     
    Cycle Time – The time it takes to successfully complete the tasks required for a work process.
     
    Apply the above definitions to your scenario, for direct answers, pick one:
     
     

    5 minutes, 30 minutes, 3 positions
    30 minutes, 5 minutes, 5 batches
    75 minutes, 135 minutes, 25 minutes
    I have no clue
    Stan is so Cool

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    #188519

    Darth
    Participant

    You can forget about winning “Most Helpful Poster” although you still have a shot at “Most Prolific Poster”.

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    #188523

    MBBinWI
    Participant

    F.  ___ and E.

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    #188524

    MBBinWI
    Participant

    If posters read through the sarcasm and understand the point, Stan is often helpful.

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    #188526

    Rao
    Participant

    Process = 3
    Batch + queu = 120′
    Cycle time = 15′
    Lead time = 135′
    WIP = 25Care about lead time, it normally includes supply chain duration + manufacturing time + shipping time until the customer receives the goods.Helpfully yours.And now, continue to locally improve:
    . use statistics and DoE to frame the cycle time
    . accelerate the overall processes through (batch+queu)
    . work with your vendor to have an outside-in line-of-sight

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    #188548

    Jud
    Participant

    Considering the lack of universal agreement on these terms, especially “cycle time”, you may want to include an operational defintion along with the measured result to avoid confusion.
    Processing time (or touch time or value creating time or …) is the length of time the operator is actually working on the widget.
    Cycle time is usually somewhat longer as it also includes the time to prepare for (load, unload, etc.) processing the unit.
    Lead time is the longest of these three; the time it takes for the widget to move all the way through a process from start to finish.  Process should be at steady state when measuring. 
    Fast food example:  Lead time might be measured from the time you walked in the door till you received the burger (note that you would define standing in line as part of the lead time.)  Cycle time might be measured from the time a fry cook got the order till when he rang the bell to have it picked up (note that you would define getting the burger from the fridge as part of cycle time).  Processing time might be measured as the length of time the burger is on the grill.

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