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Topic Control Chart Type for Low Sampling Frequency

Control Chart Type for Low Sampling Frequency

Home Forums General Forums Tools & Templates Control Chart Type for Low Sampling Frequency

This topic contains 2 replies, has 2 voices, and was last updated by  Norbert Feher 4 months, 2 weeks ago.

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  • #664845 Reply

    ANTON

    Hi everyone,

    Thank you for your attention.  Need your advice on the below matter.

    I am working as Quality Manager for Flooring Trading Company.  I am responsible to develop quality at some suppliers we have.

    I do visit the supplier’s factory for 1-2 days in every month. 
    Normally I take 18 pcs of same component in each machinery and measure their length. 
    And do Xbar-R chart (2 subgroups – 9 measurement values/each subgroup) to get process stability and distance of average value of 2 subgroups to target (specification).

    Once defined the Xbar-R chart, I do necessary investigation on special causes otherwise improve (reduce variation) the process.

    Pls advise:
    1. If you have any input how to do more reliable control chart considering I visit factory only once in a month.
    2. What is the correct control chart(s) for me in the situation above?

    Many thanks in advance.

    Regards, Anton

    #665381 Reply

    Iain Hastings

    Anton,

    I think you have to look at your relationship with your supplier. It sounds like the responsibility is to “develop” quality at the supplier, not do all of the work for them.
    Has the supplier accepted that they need to improve their quality? What stake do they have in this improvement?

    If they don’t accept that they need to improve and the onus is on them (with guidance from you) I’m not sure what value there is in you generating control charts.
    If they take ownership for quality why don’t you work with them and have them generate and process the necessary information?

    #668953 Reply

    Hi,

    it depends on several factors:
    – type of data You have
    – frequency of the problem
    – cost of the measurement
    – etc.

    I also agree that it is the business partner who should own the SPC process instead of You…

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