# 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.

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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.

2. ### MinerModeratorStaff Member

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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.

3. ### equilibriumMember

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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.

4. ### Bob DoeringMember

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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!

Emmyd and Miner like this.
5. ### alex41New Member

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This question is really confusing. How should we answer the auditor?

6. ### Andy NicholsModeratorStaff Member

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Alex: Tell us more about the background to you post, so we can help...

7. ### alex41New Member

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If a device calibrated at 20°C is used at 35°C, how does the temperature change affect the process?

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