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Approved methods for determining MTBF

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  • #53307

    Mélanie
    Participant

    I was discussing the calculation of MTBF at work and someone said that using historical product returns data is an approved method. If you don’t have the time the components have been used before being returned is it ok to calculate based on time since sold?

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    #189575

    Tierradentro
    Participant

    It appears you are simply wanting to quantify your quality levels from the customer’s perspective as measured by product/part returns.  This can be readily captured using simple binary metric (ie % defectives).
    MTBT is generally used as measure of equipment reliability, where such tools as PM, TPM, etc are used to extend and stabilize it. 
    Regardless, I wouldn’t use the date sold to capture durability information, which quantifies length of use in time.  But this is just one data point.  Get more.

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    #189615

    Jonathon Andell
    Participant

    It’s a long way from ideal, but if that’s all you have that’s what you need to use. That’s why some computer manufacturers embed a clock in their units, to track at least the hours the unit was switched on. Tracking actual hours of active use is more tricky.

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