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VSM – Should NVA Processes Be Considered?

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  • #55714

    Mujaffar Muzawar
    Participant

    IF there are NVA Processes such as Drying intensive lacquering paints which is more than 24 hrs processes but the part cannot move further untill this process is completed. In such case will the drying process be included in the value stream map as process or it should be shown as WIP inventory ?

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    #201297

    Chris Seider
    Participant

    Why would drying not be considered VA? Wouldn’t the customer expect the paint/lacquer dried properly upon delivery? You are physically transforming the product…and it’s not rework I’m assuming so it’s VA.

    What are you trying to do? Reduce CT or ….? It’s not WIP if it’s changing while in the “bin”.

    My two cents.

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    #201303

    MBBinWI
    Participant

    @cseider – precisely correct, my friend.

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    #201305

    Strayer
    Participant

    Whether the drying step is VA or NVA really shouldn’t matter for VSM. A primary purpose of VSM is to identify the VA and NVA steps. Nothing significant that happens should be omitted. I prefer a TVM (Time Value Map) over VSM since it also shows where time is being spent in the process, value-added or not. A TVM shows where there is substantial wait time, which is NVA even though that step itself may be VA. It would show that speeding up drying time would decrease cycle time. But you already know that.

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    #201308

    MBBinWI
    Participant

    @Straydog – if the physical transformation requiring the time is unacceptable, that identifies a need to search for a different technology or different way to satisfy the requirements. This may exist, or may not, in which case a research project may be needed.

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    #201320

    Mike Carnell
    Participant

    @muzawarm I agree with @cseider and @MBBinWI this is not a NVA step and it needs to be on the map. Just a quick question. Let’s say you leave it off. What does your VSM, TVM, process map, whatever you use, represent? It doesn’t tell anyone anything.

    That aside you have a days production sitting in queue. Just about any accountant should be able to calculate the value of having that much inventory tied up. That is what it costs you to use a paint that dries that slowly. Use that number to go get the money to fix it.

    Just my opinion.

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