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Buying the correct measurement device

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  • #30598

    Brad Gover
    Participant

    I need to determine if my company should purchase a specific CMM floor model measurement device.  I will need to make a decision based upon repeatability within specification limits.  Is a Gage R&R the correct tool to use when I may not have 2 or three other operators to help with the measurements?  If I am to perform all the analysis myself, is there another way to asses the precision and accuracy?
    Appriciate the help–In Training, Brad.

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    #79829

    Mike Carnell
    Participant

    Brad,
    You need to run the MSA just as you will when it is in use. That is all 5 parameters of the MSA – stability may be a little hard to do so if it passes the other 4 hold 20% and give it to them when the stability is proven.
    I think the the MSA is a good way to do the qualification. Do parts. Don’t let them get you measuring a ball plate. You can miss some of the aspects of trying to use the probe if you aren’t making the different types of movements you need to make when you are working on parts. In a Study like this I wouldn’t use all the same type of part either. If you get some variation in the type of part you might find a particular part of the measurement device that doesn’t work well.
    Good luck.

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    #79858

    Brad Gover
    Participant

    I want to thank you for your reply.  I  am vary interested in MSA.  I might know it by some other discription.  What is it and where can I get information about it.  My delima is I alone must decide if we should purchase the floor model CMM–a position you might have been in before.  I do appriciate your expertise in this matter.
    Again, Thanks for your help!
    Brad.

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    #79860

    RT
    Member

    Brad:
    MSA = Measurment System Analysis.  It consists of the following 5 steps: accuracy, precision, resolution, stability and linearity.
    Any good SS book should cover this topic.

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