Caliper Calibration - How to Calibrate a Caliper

In this episode, we’re going to talk about the how to calibrate calipers.

In past Mitutoyo Metrology Training Lab episodes, we have defined the concept of calibration, discussed the purpose of calibration, and introduced important aspects of what makes a good calibration method. In this episode, we will apply all those ideas to the calibration method for a caliper.

Calibration is a search for errors and we want to develop a calibration method that efficiently hunts down and finds any potential errors in the measuring instrument. So how do we best do that for a caliper? Well, there is a nice American National Standard for digital, dial, and vernier calipers, called ASME B89.1.14, and the calibration method we’ll be discussing is based on that standard.

#Mitutoyo #CaliperCalibration #Metrology

[amardipsinhrahevar]

I working in automotive industry in standard room. We need calibration training. So what to do?

[Kzila]

Jim was my instructor for the Mitutoyo Metrology Course that I attended at Mitutoyo's NA Headquarters. Having worked as a QA manager in Automotive/Aerospace for close to a decade now, I will say that Jim was one of the most informed people I have ever come across in this field. He not only has the technical knowledge but also understands the field from the practical perspective of those working on the floor of these shops. If you ever get the opportunity to attend any of Mitutoyo's courses I highly recommend it.

[ET-cjjo]

In Japan, Mitutoyo is pronounced Mitsutoyo, and is written that way in katakana on the Mitsutoyo website (ie ミツトヨ). The tu instead of tsu is a hang up from the romanization of Japanese in pre-war days. There is no such sound as tu in Japanese and never has been. The company was originally established as 三豊製作所 (Mitsutoyo seisakujo). Seisakujo (or seiksakusho) means something like factory, literally "things-make-place", so basically manufacturing. The characters 三豊 are also pronounced Mitoyo, and used as a place name. The Japanese website of Mitsutoyo has a history section, and states that the company started as a research institute in Kamata, Tokyo. There is no clue as to why the company was named Mitsutoyo.　However, when the second character (toyo) is attached to a number, then it means something like "exceeding standard". So as 三 means three, then it is possible that the founder of the company in the 1930s wanted to express a high standard of quality for the products, and named the company thus. Toyo can also be interpreted as meaning abundant, rich.
Best wishes from Japan.

[delightfulThoughs]

The explanations given are for "verification of measurements between tolerance" and a "calibration" method in case the device is not between "tolerance " is missing or not possible to perform. What if the device doest not pass? What to do to bring it back to specification?

[praticalmechanical]

so by doing so much work to "calibrate", then tell me how exactly will be apply corrective action?

[julianweiser]

You can always press harder to get different readings. Press the outside of the jaws themselves together, not the body with the electronics.

[KISSMYACE]

Light is one of the most accurate forms of measurement from what I've seen...

[NicksStuff]

11:34 Yep, keep pressing until the calipers show the value you expect

[md.aa]

As you said about ASME b89.1.14, there is a table there containing the MPE values for checking and comparing our measurement errors like 'E'.
So if E is less than the MPE value, but not zero, must we add the value of the measured E to the next measurements we take when measuring???

[snakes]

"It's not correct to rock it around to get the value you like..."
—Proceeds to rock and squeeze calipers until they read minus 5/10ths for every measurement—

[EvelOttos]

Given your outside calibration data test points, what minimum measurement would you be comfortable declaring this caliper be used for and how would you back up that declaration? I will tell you from experience that when presented to modern medical device auditors, they will have issues with this caliper being used for measurements smaller than the lowest calibration point (1.0").

[m.cigledy]

A bit late to the game, but you clearly state that the inside should be checked at a size of 3/4" minimum, and then check them at 0.5000"

[SuperRozack]

How many correction Tolerance recomendation from Mitutoyo, ?

[zaciejo]

Where can you see how to use the adjusting screws to align the jaws parallelism ?

[creativ]

Hello i would like to ask, its worth to do a calibration for a newly purchased Mitutoyo device/caliper? I mean for personal use, not in company/commercial use. Its worth to pay extra for calibration? Thanks

[jakechu]

Can micrometer use ASME B89.1.14-2018 as caliibration criterion as well?

[bartharkemametalworks]

The caliper readout is 0.005. The tolerance is 0.001. A measurement of 0.0012 will give a readout of 0.001. Is this still within tolerance? My documentation from mitutoyo says 0.02 mm 'round-off error not included'. And I don't understand why there is a difference between the metric and the imperial system. Accuracy of 0.0015 (or even 0.001 inch) and 0.02 mm is not the same. Is there a different ISO tolerance between them?

[大漠-op]

thanks Jim. Do we need to consider the uncertainty of the gauge blocks in the calibration?

[michaelshelnutt]

How can I purchase the gages and data sheet shown?

[pauldiaz]

Hi Jim where can i find a list of tolerances for calibrating different instruments?