1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.
Dismiss Notice
You must be a registered member in order to post messages and view/download attached files in this forum.
Click here to register.

What is the impact if gages calibrated at 20° are used at 35°

Discussion in 'Gage Calibration and Uncertainty' started by shankar Jadhav, Oct 8, 2015.

  1. shankar Jadhav

    shankar Jadhav Member

    Joined:
    Sep 5, 2015
    Messages:
    6
    Likes Received:
    0
    Trophy Points:
    1
    Why we do calibration in 20 ° and we are using gauges at temp about 30 to 35 °. what is the impact on gauge. please anyone explain.
     
    shankar Jadhav, Oct 8, 2015
    #1
  2. Miner

    Miner Moderator Staff Member

    Joined:
    Jul 30, 2015
    Messages:
    627
    Likes Received:
    543
    Trophy Points:
    92
    Location:
    Greater Milwaukee USA
    It depends on the gauge and the materials comprising it. Essentially, your concern is with the coefficient of thermal expansion. This would affect both the gauge and the feature measured.
     
    Miner, Oct 8, 2015
    #2
    RonR Quality Pro and Andy Nichols like this.
  3. equilibrium

    equilibrium Member

    Joined:
    Aug 10, 2015
    Messages:
    32
    Likes Received:
    27
    Trophy Points:
    17
    I would also consider tolerances on what is being measured. For example, this is much more of a concern when tolerances are in the tenths (.0001") range versus the ten thousandths (.010") range.
     
    equilibrium, Oct 8, 2015
    #3
  4. Bob Doering

    Bob Doering Member

    Joined:
    Jul 30, 2015
    Messages:
    37
    Likes Received:
    27
    Trophy Points:
    17
    Maybe a little more clearly, the material the gage is made of versus the material you are measuring. It is the difference in thermal coefficient of expansion that creates error. Stainless steel gages versus aluminum parts outside of standard temperature....you will be chasing your tail!
     
    Bob Doering, Oct 27, 2015
    #4
    Emmyd and Miner like this.
  5. alex41

    alex41 New Member

    Joined:
    Aug 15, 2023
    Messages:
    4
    Likes Received:
    0
    Trophy Points:
    1
    This question is really confusing. How should we answer the auditor?
     
    alex41, Aug 15, 2023
    #5
  6. Andy Nichols

    Andy Nichols Moderator Staff Member

    Joined:
    Jul 30, 2015
    Messages:
    5,264
    Likes Received:
    2,622
    Trophy Points:
    112
    Location:
    In the "Rust Belt"

    Alex: Tell us more about the background to you post, so we can help...
     
    Andy Nichols, Aug 15, 2023
    #6
  7. alex41

    alex41 New Member

    Joined:
    Aug 15, 2023
    Messages:
    4
    Likes Received:
    0
    Trophy Points:
    1
    If a device calibrated at 20°C is used at 35°C, how does the temperature change affect the process?
     
    alex41, Aug 15, 2023
    #7
  8. Andy Nichols

    Andy Nichols Moderator Staff Member

    Joined:
    Jul 30, 2015
    Messages:
    5,264
    Likes Received:
    2,622
    Trophy Points:
    112
    Location:
    In the "Rust Belt"
    Which part are you having a problem with?
     
    Andy Nichols, Aug 15, 2023
    #8