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Designing of experiments

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  • #35399

    Summerfield
    Participant

    We have four factors . Standing Vac, Holding Vac , Timer , Part.
    Each  three levels. I know if we change holding Vac we will have to change timer  and standing Vac.
    How do I design a experiment

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    #99474

    Rog
    Member

    Ash,
    Is ‘timer’ really a discrete variable or a total cycle time made up of other discrete variables? without more information it sounds like it shouldn’t be in your DOE. Try breaking your whole cycle time into it’s components if there are more than ‘standing vac’ and ‘holding vac’ then maybe there is another variable in there rather than ‘timer’. What is it timing after all.
    Leaving timer in there it means that only certain combinations are physicaly possible and your design would need to take account of that.
    Rog
     

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    #99480

    Summerfield
    Participant

    Yes timer is a discrete variable. The process is as follows
    In a die we pull metal under vacum. There are two kinds of vaccum which are important to the process. One standing and other holding. Timer is a value input for PID to kick in. The properties of the part depends on there three factors . the forth factor is the part itself . However if the DOE is very complicated we can eliminate the forth factor of part by running only one part. When we change the holding Vac it will effect the standing vac. I can still keep the timer constant. At a certain holding vac if I change the timer it will effect the standing VAc. The standig vac can be changed without effecting eithe of the other two factors.
    Hope this explains the process

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    #99516

    Rog
    Member

    Ash
    I think I have it. I guess you have to design your experiment and just make sure that all conditions are achievable. I would think that whilst the outcome of the DOE will show some interactions it should also point to an optimum condition.
    Rog

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