Outside Micrometer Calibration - How to Calibrate - Mitutoyo
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- Опубліковано 22 лип 2018
- In Episode 6 of the Mitutoyo Metrology Training Lab series, we look at how to calibrate outside micrometers.
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 an outside digital micrometer? Well, there is a nice American National Standard for micrometers, called ASME B89.1.13, and the calibration method we’ll be discussing is based on that standard.
In past episodes, we have defined the calibration of measuring instruments, 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 micrometer.
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 micrometer? Well, there is a nice American National Standard for micrometers, called ASME B89.1.13, and the calibration method we’ll be discussing is based on that standard.
#Mitutoyo #MetrologyLab #Calibration - Наука та технологія
I was under the impression that it's important for consistency to use a slow rotation of the ratchet thimble on micrometers and the same number of clicks of the ratchet for each measurement. Is that correct or incorrect information I've been told ?
I have been told the same thing by the National Physical Laboratory
Consistency is critical. The rotation of the thimble should not be too fast and not too slow. Several clicks of the ratchet is good, mostly to get a consistent force, but the "exact" number of clicks of the ratchet is not so important.
Ok, thank you very much for the additional information.
I just turn the thimble slowly until it clicks. Since the amount of torque require to overcome the tension is the same that should be good enough as going faster might compress the part by a few microns.
Ajaylakhaniya
Thanks for publishing these, Jim and Mitutoyo. This isn't a topic that's widely covered on the internet.
Thank you so much. It's comments like this that motivates me to keep expanding our video offerings.
Jim Salsbury please make one for dovetail dial indicators!
You did a fantastic job in this video; production, design, audio, and presentation. I do greatly appreciate the explanation given on micrometer calibration. Thank you for offering your knowledge and time.
Wow, thank you! We are glad you enjoyed it.
Hi Jim, many congratulations for your really clear explanations on your MTL videos, but special congratulations for your really clear english language , seems to read a book 👍🤪very rare to listen a so perfect english , especially for me Italian even i work around the world in contact wit multi racial people from all over the world, i am an enthusiast of metrology as well as Mitutoyo tools.
I just noticed a typo in the data sheet for this calibration. The parallelism is a range, not a plus/minus value, so the tolerance should be 50 µin or 1 µm, without the plus/minus. Sorry about that - blame it on "copy and paste".
Is there any way to get the "report" template? I could make one up, but I like the one in the video :)
Hi, do you know how to make the display show only tenth's, and not 50 millionth's? I know there is a way to do it, and I've been searching online a while and haven't found it. Thanks.
We have used mitutoyo instrument s and machine
How can I read and understand the optical parallels(minute 9.25 in video)...when it is correct or not...Thank you very much
Thanks for the great lesson! I’m looking forward to my Mitutoyo micrometer arriving soon.
We hope you enjoy it!
Thanks for producing these valuable videos. I’m new to this and I have a basic question. Should the adjustment on a mechanical micrometer be made only at zero, or can it be used to correct for an error near a particular measurement to gain more accuracy at a particular point. For instance, if I’m measuring something that should be 0.55”, could I adjust the micrometer to read precisely 0.55” when measuring the 0.55” gauge block using the mechanical adjustment that is normally adjusted at zero? Is it better to adjust at zero, then mathematically interpolate to correct the error?
Very good question. While specifications apply from the set zero point, micrometers are frequently used in either an absolute or incremental mode. In the incremental mode, you can set your reference point anywhere, which could improve your accuracy. Using a gage block, like your 0.55" example, is commonly done in practice.
How do you rezero the barrel? I have the 0-1 inch and my barrel is off. I'm sure you have a video on it but I can't find it.
I also working in std.room you are clear my all doubt
Will be interesting to listing about boring gauge and boring measurements
Thanks for publishing this kind of video. It is very helpful. What kind of cloth you used for cleaning the measuring faces? and How many gauge bloks could be added (stack) as a maximum ?
and another doubt: could you please tell me an example of a kind or best option for a monochromatic light source for flatness check? Thank you very much
We use lint-free cloth that can be purchased at most supply stores. You should avoid general paper towels or napkins as they can be abbrasive and leave lint on the device which can foul the next measurement. While a good technician can wring many blocks together, most measurements can be made by wringing three, or fewer, gage blocks together. The fewer the blocks in the measurement, the better. If you want to be impressed, you can find a video and many images of Carl Edvard Johansson, the creator of gage blocks, wringing together an entire set of gage blocks. Pretty amazing!
Sir can you publish a video on calibration of tubular inside Micrometers
I own 2 mitutoyo calipef 500-752-20 and both if I put a strong light from a flashlight in the top of the jaws(in the area where the jaws are milled thinner) i see the fine line of light passing through the jaws.
I have same issues with 1 tesa caliper .
With chinese calioer this issue not exist.
Both Tesa and Mitutoyo are original 100% ( no fake ) bought to dealer .
Are this Mitutoyo and Tesa caliper defective? or this make part of caliper tolerance?
Can we measure 3 flute tool on LSM if yes then pls give me procedures
You need to read the operation manual. To set the absolute minimum length you close the mic around the standard then use the Origin button not the Zero/ABS button. Origin sets the absolute reading much as a standard mechanical mic while the Zero/ABS button toggles a temporary zero at some arbitrary length which is useful for comparison measurements. If the mic actually required adjustment then the reading is only accurate while in INC mode and will be in error when in absolute or if the INC origin is changed.
What is the code number on your micrometer. Please contact Tech.Support@Mitutoyo.com
Which type of calibration was this? Does the laser etching affect the readings of the smaller gage blocks? What was the tolerance of the gage blocks you were using?
The size marking on the face of some Mitutoyo blocks has no influence on the size. We recommend Grade 0 gage blocks for the calibration of most micrometers. The tolerances are defined by ISO 3650 or ASME B89.1.9 and can also be found in the general Mitutoyo catalog.
Should the .210" block not be measured across the "lapped" faces and not across the faces with the laser ident on them. Is it just a fluke that the smallest block is .210" X .210" ?
So if I understood correctly, calibration is essentially an accuracy test? There is no other adjustment aside from zero.
For larger micrometers, is needed to use a gage block as reference? For example, the 10in micrometer, we need to have a 9in reference block? or exist an alternative method?
You should use a gage block for zeroing out the micrometer during the calibration process. The standard which comes with the micrometer can be used to zero the mic on the shop floor but is not accurate enough for the calibration process. If you do not have a 10 inch gage block, you might consider wringing two smaller blocks together to meet that same length.
How do you get the 1 back on your 1-2?
How to make standards of profile projector
are kimwipes sufficient for cleaning micrometer anvils? what do you recommend?
Kim wipes are perfectly fine for cleaning the measuring faces of the mic. And don’t fear using a piece of paper like a post it to clean the faces. The faces are made of carbide normally so the paper isn’t going to scratch or damage the faces.
For example (0-25)mm caliper I need to use a standard block gauge block ?
You can use metric gage blocks to match your meteric micrometer
Paper to clean mic is good, but what happens to mic's are over 1in as you cannot close them down onto a piece of paper, so this method fails to address all mics over 1 in or 25.4 mm. How would you clean the face of a 5 to 6 in mic as you cannot close it down on a piece of paper.
What is the proper proces for checking for instance a 200 to 225 mm micrometer just the same increments but wring up the gauge blocks to the correct sizes?
Thank you for your question. You are correct, the proper process for checking instance at 200 to 225 mm micrometer are the same increments but wring up the gauge blocks to the correct sizes.
Mitutoyo gauge blocks would be nice to have, but I don't even want to know what the price tag is on them.
Not too bad if you get the steel ones and keep them small. Amazon sells individual Mitittoyo blocks at around $40 for the .500 steel. Ceramics are pricy though.
Where can I get the ball gage for parallel face checks.
I would like to know that information as well @MitutoyoAmerica
Hello Mitutoyo team, Where can we purchase these Gauge blocks? We need the Gauge blocks to calibrate the instrument internally
Hello Chit, thank you for the question. For pricing, if you live within the United States, please call us at 888-Mitutoyo (648-8869). If you live outside the United States, then you can use the following url to locate and contact the nearest dealer to you. www.mitutoyo.com/about-us/worldwide-locations/
We hope this helps.
What is quantizing error??
Internet celebrity!!!
Hi, could you clear my doubts.
1) What is different between optical flat and optical parallel?
2). What is the 4set of optical parallel? And what are the different.
3). Which on is the right selection for the micrometer anvil parallelism measurement?
Typically optical flat and optical parallel are used interchangeably.
The set of optical flats are typically different thicknesses so that you can measure the parallelism and different incremental rotations of the spindle.
It's not about which is right or wrong. It's about following your procedure. I prefer checking flatness and parallelism with optical flats over the ball method. Imo the ball method skips a large portion of the surface area of the measuring faces.
How to measure the flatness of measuring face with gauge Block
The best way to measure flatness of the measuring faces is with an optical flat. However, the value of an independent check of the flatness is highly debated by the experts and not commonly done by calibration labs (at least in the US market). The strategy of both the ISO 3611 and ASME B89.1.13 standards is to include a test of the "partial measuring face contact", which looks at the combined influences of flatness and parallelism. That is the goal of the test with the small sphere.
Jim Salsbury
Thanks for your replay. Expecting more learning videos .
Where can you purchase that measuring sphere?
Hello David, thank you for the question. These are known as Ball Gages, and we do not sell these. There are some US companies that should sell them, such as Ball-Tec. We hope this helps.
Is this process the same for pointed tip micrometers
Short answer: yes. The same gage blocks used to calibrate the outside micrometer can be used to calibrate the point micrometer. They would test the micrometer across it's range. Obviously, you would not need to assess the parallelism of the measurement faces.
Please explain how to calibrate mechanical external micrometer
What the code number on your external mircometer
3:56
I can hear nothing on this video, was it muted? can someone pls. Summarize what he sayin?
I would first try looking at your volume controls to make sure your volume is on and turned up. If you still are having issues with the volume, we do have Closed Captioning for this video. Hopefully one of these works for you.
inside micrometer calibration sir
You didn't calibrate them. You just checked that they were calibrated and within tolerances.
Thanks for the reply. The topic of this video was calibration of an outside micrometer. We did not cover adjusting the accuracy if the unit was out of tolerance. At 12:04 Dr. Salsbury states that this mic was calibrated and was within tolerance so no adjustment was needed.
@@MitutoyoAmerica Yes, to be fair he did. But being 12 minutes in to a video with "How to Calibrate" in the title, it's not exactly honest to just state it didn't need to be calibrated. Yes that's true, the mic was good, but I've already watched this specifically because i wanted to see the calibration being done.
You could easily have swung a mic out of calibration to demonstrate, or just titled it "how to check calibration", either is fine and a viewer would get what they should reasonably expect from the title, but as it stands you're promising content you're not delivering.
Please don't read this as overzealous or hot-headed, I just want it to be explicitly clear to you as content creators that it is frustrating to users when you overstate or mislead in the presentation of what the video is. I don't accuse you all of doing this with malice, or even consciously, and I'm not saying it's a big deal in the context of a single video. But little behaviours like this imply to your audience that maybe we shouldn't expect from you what you state you'll deliver and perhaps you value our views more than being honest with us.
I don't feel there was a big wrong doing here, just explaining why it is annoying. Food for thought.
I appreciate your comments and concerns. Unfortunately there is a lot of confusion about the definition of calibration. You may be interested in episode 5 in this series which directly addresses that question.
Here's the link for our video that discusses the meaning of calibration: ua-cam.com/video/NV1VToAqfXI/v-deo.html
I'm not impressed by the use of the ratchet thimble in such a haphazard way. Nor of it's use when measuring cylinders or balls!
your videos is more about outside micrometers, how about inside micrometer?, you didn't know how to calibrate it?