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Confused About Muda/Mura/Muri Example

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  • #43824

    Ken Theriot
    Participant

    I just got the Pascal Dennis book, Lean Production Simplified.  In it there is a Problem illustrating muda, mura, and muri through the use of a forklift example: “How best to move 3000 kg load with a forklift having a capacity of 2000 kg.”  The choices are
    Muda: 6 trips @ 1000 kg, Mura: 2 trips @ 2000 kg plus 2 trips at 1000kg, and Muri: 2 trips @ 3000 kg.  Then it says: “Best: 3 trips @ 2000 kg.”
    The math doesn’t make sense to me (totals seem to add to 6000 kg per trip, not 3 kg; if it means round-trips, how can the “best only be 3 trips?, etc.). 
    Can anyone help me understand this?  Thanks.
    Ken Theriot

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    #139568

    EdG
    Participant

    Ken,
    I cannot go to my copy of Lean Production Simplified as I don’t have it handy (I’ll take a look tonight).  However; Muda, Mura, and Muri refer to different aspects of inadequacies of a process due to batch processing and/or customer demand fluctuations.  
    Muda is the waste in a process; these are the seven production wastes that Taiichi Ohno references.  Transportation, Inventory, Movement, Waiting, Overproduction, Over-processing, and Defects.  So, in the example muda is looking at unnecessary transportation.
    Mura is the unevenness or fluctuation of the schedule.  Variability…  So, in the example mura is looking at the imbalance in the assigned task.
    Muri is the overburdening of your people or equipment.  So, in the example muri is looking at demanding that a forklift carry X+ weight when it is rated to carry X weight.
    Sorry I cannot make a more accurate reference to the example.  I’ll try and take a look tonight and post additional notes if you like.  If I remember correctly, there were some graphics that went with the example to help describe what Pascal was trying to convey.  Give me a little more time and I’ll see if I can further elaborate.
    EdG

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    #139572

    Ken Theriot
    Participant

    Ed,
    There were two typos in the example!  In the diagram, it shows that you actually have a 6,000 kg load, not 3,000.  Now it all falls into place.  Thanks for the reply…..and beware the typo!
    Ken

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    #139581

    EdG
    Participant

    Ken,
    Just looked at the book and the typo is in the initial problem statement (forgot about it until I looked at my notes on that page).  You are right in the actual load that you want to transport is 6,000 kg and the capacity on the forklift is 2,000 kg.
    In the Muda example, we are wasting time and effort because we could potentiall carry more.
    In the Mura example we have an imbalance in what we are transporting (which incidentally leads to more muda).
    And in the Muri example we have overburdened the equipment.
    So the ideal example is to transport three loads at the maximum capacity of the forklift and accomplish the task.

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    #173432

    Sorour
    Participant

    You guys are pathetic. Bought yourself a nice book and are trying to read it without any basic critical thinking. Can’t you even count from 1 to 6?! I really doubt is you ever went/will go beyond reading the book and have seen what manufacturing actually is in practice.

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    #173434

    Michael Mead
    Participant

    Relax Paul. They both have only 5 fingers on each hand. Eveybody must start at the beginning.

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    #173450

    Stevo
    Member

    Paul,  I like your fire.  Not everyone can get riled-up about a post that is over two years old.
    Stevo

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    #173456

    Sorour
    Participant

    Stevo, I like your sarcasm. Not everyone can look for every newly coming post on the forum and contribute something so funny.

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    #173467

    Stevo
    Member

    Thank you,
    It’s kind of my thing.  Some people offer real help, then there’s me.
    Stevo

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    #175569

    Shashank
    Member

    The ‘3Ms’ of work are:
    muda, meaning waste
    mura, meaning irregular, uneven or inconsistent
    muri, meaning unreasonable or excessive strain

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