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Calibration Frequency

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  • #29857

    Mel M. Mijares
    Participant

    Im looking for the oppurtunity in increasing the frequency of our calibration onΒ the following device ; such caliper, micrometer, steel tape, etc. Is there anyone can suggest what approach to be used? Or I will surely appreciate if if you could help me look for the appropriate manual/books or any articleΒ  written pertaining on this opprutunity.Β  Thanks in advance….

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    #77188

    James A
    Participant

    Hello Mel,
    I don’t think there is a stated rule or standard for how often any gauge or measuring device is calibrated.Β  Generally, gauging of any sort is calibrated according to how much use it gets, and how much it wears between calibrations.Β 
    E.G.Β  if a gauge’s history shows it wears appreciably between calibrations, then it should be calibrated more often – but a similar gauge used in another environment may not wear so fast, and can be calibrated less frequently.
    Because this can involve hundreds of gauges across a business, many businesses use an automated gauge tracking system, so that the standards engineers are warned of a gauge needing calibration.
    So, to answer your question:- calibrate gauging as often as it needs it.Β  If you need information on how to do a Gauge Repeatability & Reliability (GR&R) study, any text book that covers MSE (Measurement Systems Error) should give you the necessary detail.
    James A.

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    #77252

    Thomas C. Trible
    Member

    Mel,I recommend that you contact the National Conference of Standards Laboratories and obtain a copy of “RP-1 “Establishment & Adjustment of Calibration Intervals” (3/96)” This Recommended Practice (RP) is intended to provide a guide for the establishment and adjustment of calibration intervals for equipment subject to periodic calibration. It provides information needed to design, implement and manage calibration interval determination, adjustment and evaluation programs.

    Both management and technical information are presented in this RP. Several methods of calibration interval analysis and adjustment are presented. The advantages and disadvantages of each method are described and guidelines are given to assist in selecting the best method for a requiring organization.TC Trible

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    #77256

    Khandekar
    Participant

    Just a thought…a question actually:
    Can we use the Stability Study from AIAG MSA manual to decide when to calibrate an instrument – Condition based calibration instead of fixed interval?

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    #77350

    Omar Revilla
    Participant

    There’s specific cycle time for the calibration of measurement tools, depending on your manufacture requirements, for example ifΒ your company work for automotive industry it takes 12 months period, In my case my company is in the aerospace industry usually is 6 and 3 months cycle due the importance of the product, I suggest to take a look at the NIST webpage (National Institute for Standars and Technology) where you can find information on this matter,or I can share information with you about it, just emailme, bye

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    #77363

    Mel Brown
    Participant

    Mel,
    You have received some good advice from others –
    They have offered up try and true resources like N.I.S.T. and N.C.S.L as starting points.Β  My question to you is -” What in your current system is driving the increase in freq of calibrations”?
    Increase frequency drives costs up – equipment history is an excellentΒ source of foundation data.
    Β 
    Mel

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    #77371

    Mel
    Participant

    Hi Mel,
    Ya, your right increasing the frequency would be a higher cost.Sorry I wrote in my first mail increasing the frequency, well my main intention is decreasing the frequency.
    Basically the main reason is that we will have a new business coming into our facilty few months from now, and our present condition on the laboratory is that our calibration schedule is already very tight since there are so many device to be calibrated per day. And I agree with you, after I can get the right information from N.I.S.T , the data on calibration results probably would be the best thing to look into if we could reduce the frequency .
    Thanks for the information
    Β 
    Mel
    Β 

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