Influence of Temperature on Measurement - Metrology Training Lab

[@Changautam.]

Excellent

[@MitutoyoAmerica]

Thanks, glad you like our video.

[@syamprasadg2556]

Crystal clear explanation. Superb.

[@johndonlan5956]

Jim, this is an awesome video. It deals with something that we very seldom think about.... Temperature and it's affect upon the coefficient of expansion of different materials. You explained it so simply in an easy to understand fashion! I used to run an inspection lab in an r&d facility where we worked on experimental tank ammunition for army tanks. And we had all the conditions that you were talking about affecting our ambient temperature.... Machinists walking in and out of the inspection lab constantly all day..... Parts being brought in for inspection at one temperature, while the inspection instrumentation (properly calibrated, showing current certificates of calibration) was at a different temperature. We did not have an enclosed temperature controlled white room. Watching your video I can see how much influence temperature could play, especially on parts that were made out of less dense materials such as aluminums, brass, coppers, and lower carbon steels. And when you're working to mil specs..... Accuracy is everything! Thank you for this terrific video!!!

[@MitutoyoAmerica]

We are glad you enjoyed this video and that you find the information informative.

[@Alleykatsks]

I would've never thought that I'd understand this. Of course it helped to watch the other videos explaining terms.

[@swaraj1501]

Great its very helpful...Thanks from INDIA 🇮🇳

[@MitutoyoAmerica]

Glad it was helpful!

[@LeoMakes]

Really interesting subject matter and very good presentation!

[@magnusklahr8190]

Very good explanation and usefull.

[@MitutoyoAmerica]

Glad to hear it was helpful!

[@speaklifegardenhomesteadpe8783]

Really interesting!!! Thank you! Didn't they change the way they measure air temperature for at least meteorology in line the 90's? Trying to find info on this as I remember it was in the news at the time pretty heavy but I can't find info on it.

[@YukYuk12]

Very informative . Thank you

[@MitutoyoAmerica]

Glad it was helpful!

[@GaugeHow]

very useful regarding temperature. If we measure around 23 degrees, that causes any major effect on measurement?

[@MitutoyoAmerica]

Yes, but you need to know the CTE of the materials you are measuring. Our steel blocks expand at 10.8 parts per million per degree C. That means 10.8 microns per meter or 10.8 microinches or millionths per inch for every 1 degree C of change. At 21 degrees C, this 1 inch gage block will have grown 10.8 millionths of an inch bigger than at the reference temperature of 20 C.

[@dr.jimsalsbury695]

Any deviation from 20 degrees will effect measurement. How "major" the effect is depends on what you are doing. In our Calibration Lab, 23 C is not acceptable, but for someone measuring small workpieces with micrometers and calipers, then 23 C is probably not a big deal.

[@johnpgerrity]

@@dr.jimsalsbury695 Hi Jim - really appreciate your series! If you're measuring steel components and your reference is a steel gauge block or micrometer with approximately the same CTE can you still measure relatively accurately? I'm wondering if a case could be made for having measuring gauges used on the shop floor be made out of the same material as the parts?

[@MitutoyoAmerica]

@@johnpgerrity Yes, that is a good strategy. The micrometers and calipers from Mitutoyo all have a CTE close to that of steel for that very reason. Even our carbon fiber calipers have a scale that is close to steel. And our ceramic gage blocks were designed so that the CTE is close to steel. Keeping all the CTE values similar eliminates one of the biggest temperature problems.

[@davidflack6430]

@@MitutoyoAmerica true but not all components are made of steel. Good video though. Fun starts when an assembly has parts of different materials.

[@hugoboss104]

Great knowledge. Poor audio.