Dial Caliper Calibration - Metrology Training Lab

In this episode of the Metrology Training Lab , we’re going to revisit the calibration of calipers and look at a specific issue with dial caliper calibration.
In a past episode, we thoroughly covered the calibration of calipers, following the guidelines from the American National Standard ASME B89.1.14. In that episode, we focused on the more popular digital caliper, and we missed discussing an issue that is important to consider for dial calipers.
Let’s do a very brief review and summary of how to calibrate calipers. I’m going to first use a digital caliper, and I’m not going to try to be particularly precise in this example, so please forgive me for that.
For the outside jaws, we take a series of measurements over the measuring range, and vary the location across the jaws.
We then use a gage block on a surface plate for the depth and step measurements.
I’m going to now repeat some of the same measurements, this time using a dial caliper. I want you to look closely at the angular position of the pointer in the dial.
Due to our choice of measurement standards, the pointer is in the 12:00 position for every measurement.
Dial calipers use little gears, and the gears can wear. It is possible for there to be errors within a rotation of the dial that you won’t see if the calibration method results in the pointer always being at the 12:00 position. For this reason, the ASME B89.1.14 standard requires some test points that put the pointer in additional angular positions.
For example, I have two gage blocks here wrung together. This is the 0.125 block and this the 0.150 block - these are standard blocks from an inch set of gage blocks. For this style dial caliper, if I measure the 0.125 block, the pointer should be at the 3:00 position. If I measure the 0.150 block, the point should be at the 6:00 position. And if I measure the two blocks wrung together, the pointer should be at the 9:00 position.
So two gage blocks, three additional easy test points, not too difficult to test the accuracy of the caliper with the pointer in different angular positions. The ASME B89.1.14 standard does not prescribe specific test points, so you have lots of flexibility here, but we wanted to show you one option that does the job and is pretty easy to implement.
#mitutoyocalipers #metrology #calipercalibration

[@GaugeHow]

good, thanks for

[@lokeshkaushik5493]

Please provide calibration method for magnetic V Block..

[@robertnoyes1115]

great video how would you make adjustments for that caliper? Also I watched all your videos very nice job. I dont live far from industry california do you do classes there?

[@motleypixel]

not finding the actual calibration adjustment procedure..to me this is a caliper check, not calibration.

[@windsurfer3329]

I have the same dial caliper (505-637) which has both inch and metric scales. The caliper is very accurate is in inch scale, but way off in metric scale. The error increases almost linearly from 10mm to 150mm, and reaches its maximum value (almost a full revolution) at 150mm. How can I take accurate measurements in metric scale (I don't use much of the inch scale) with this caliper???

[@mc9304]

The dial has both scales? I’ve only ever seen metric OR inches

[@rsundarraj6141]

How to calibrate thread pitch micrometer

[@cranke99]

What do you do if you take your dial caliper in and it gets rejected because it closes at .001 to .003 on average? Not always closing at zero?

[@MitutoyoAmerica]

Thanks for the questions. There may be wear on the jaws which would require these to be sent into our Repair Department, or they are no longer parallel which can also be adjusted by our Repair Department. You can contact our Repair Department at www.mitutoyo.com/contact-us/repair-calibrate-field-service/ or by calling us at 888-Mitutoyo (648-8869).

[@cranke99]

@@MitutoyoAmerica thank you

[@Tabloid1967]

@@MitutoyoAmerica What about the possibility of loss of pre-load or anti-backlash?

[@guliwer1713]

крутой штанген .... и плитки тоже ....

[@shofarsogood7504]

So… how do you calibrate as the title suggests? This is just taking measurements

[@MitutoyoAmerica]

Thank you for your question. Calibration can include taking measurements and comparing the results to known values. The term “calibration” can lead to confusion because calibration to one person may not be calibration to another. Mitutoyo has another video on this specific topic kzbin.info/www/bejne/hIeUh4eldtaZjqs

[@user-gc2zs1cc6g]

Лучше бы прислал и натуральный стрелочный митутойя ,а то у нас тут одни подделки Китай ские