How to Use a Micrometer

We show you how to use a simple analog micrometer to very precisely measure small lengths.
demos.smu.ca

[@angelofdeath8739]

My practical are tomorrow and I'm watching this at 12pm at night. For someone who has exam tomorrow, this doesn't seem like a good time to be awake. Good luck to all those night owls who stay up late and get up early with no energy drain. I do.

[@SMUPhysics]

Good luck on your exam! You got this! Remember: Every complete turn of the micrometer is 0.5mm. Just count the marks on the main barrel (bit that doesn't turn) to find the total number of complete turns and then use the marks on the barrel (bit that does turn) to get the fraction of the last incomplete turn.

[@ellerona5918]

How was the exam? Where are you at life now? Hahhaa

[@ellerona5918]

Bebeng, what's your course?

[@icantfixu]

​@@ellerona5918 ello !! 😊

[@icantfixu]

Gl with ur exam

[@newsmoommy]

Worst sound usage

[@adithyarathnayake9797]

This makes wanna fight some invaders with a micrometer

[@SMUPhysics]

Then our job here is done! :)

[@adithyarathnayake9797]

SMUPhysics🙂🙂😀

[@IbnuCuruk]

Also, never touch the spindle. The heat of your hands makes the spindle expand, making your reading inaccurate.

[@yoyo895]

learnt to use a micrometer. Now just back for the song! What is it?

[@SMUPhysics]

After years of people complaining about the music, let me say that you are my new favourite person! The music in the vid (and all our vids) are Apple Garageband "jingles"

[@tamannapatel5052]

You don't know what is this

[@nitrousgtx3]

I like that music too. :D

[@DEATHWISHVQ]

Learnt

[@yoyo895]

Raised a smile. Grammatically corrected 6 years on :D @@DEATHWISHVQ

[@Dubiestcream]

exactly what i needed, great video! Got my Physics P3 A levels tomorrow and i realised last min that i dont know how to youse a micro meter. Bigtime thanks!

[@SMUPhysics]

Glad to hear it! Good luck tomorrow (today?)

[@chaoticweeb229]

SUPER USEFUL!!! The textbook had barely any details on how to actually use the micrometer, and you showed it in such a clear and logical sequence (with epic music in the background, too). Thank you

[@ivanwalker6459]

Thank you. Exactly what I needed, no more, no less. Mainly wasn't sure what the ratchet was for, but a confirmation on reading the dial was great as well, thanks again.

[@SMUPhysics]

Glad it was helpful. And yeah, the ratchet is mainly there just to keep you from over-tightening (and possibly damaging) the screw.

[@uyenhoangnguyen3231]

i know right !

[@guitarswift7953]

My AS practicals are tmr and only now I'm watching this Hahahah it's already 10pm

[@SMUPhysics]

+Guitar Swift Good luck on the practical!

[@abdurrahmaanmooraby4955]

+Guitar Swift lol! beat me..mine are in 2 hours --'. good luck!;)

[@markhenry2186]

same ahahaha

[@Nole2701]

2018 AS physics practical in 45 minutes and I’m only watching this now lol

[@reezukarmacharyaroll3356]

mines in 35 mins 2018 watching this on data as i ride the bus FML

[@gaiusmarius4112]

Cool music Gaelic pride :D

[@Mnga86]

1- Very Helpful 2- What a wonderful music!! Love it

[@SMUPhysics]

Thank you for the nice words! We're glad it was helpful!

[@skycouncil8523]

Loved you're simple but clear explanation!... thank you very much! :D

[@itznaveen_0076]

Thank you 👍🏻

[@Jhpc399]

Thank you!

[@bruckpetros]

Wtf is that tune 💀

[@uyenhoangnguyen3231]

same question bro

[@hye2354]

lol

[@daved3494]

Great video. Interesting music. I always wanted to find a 0 to 1" internal micrometer but so far, no luck!

[@JohnPatrick58]

Nice film which explains things very well, I didn't know about the 0.005 bit, but I do now, thanks JP

[@-NotAvaRoblox-]

no problem!

[@GameFlife]

Uhm… i dont have exam but amma calculate a lifter tmr *finger cross hopefully i able to fix up my 00 echo she got beat up but amma make her run

[@psgaming8908]

thank you! All ready for my advanced higher physics experiment tomorrow 😎

[@rohitendrachatterjee9216]

Nice Video....Thanks a bunch...Will really help me tomorrow for my practicals...

[@SMUPhysics]

+Rohitendra Chatterjee Good luck on the practical!

[@GraceT10]

At 0:29, do you mean sleeve instead of barrel?

[@BedsitBob]

The two words are equally valid.

[@m4gn3tic82]

This is scottish dubstep music

[@SMUPhysics]

Good to know. Thanks.

[@pbp1701]

All ya had to do is not put that background noise in the video and say a few words..... nope you decided to go the extra mile to mess it up with your terrible instrumental selection....

[@SMUPhysics]

Sorry the volume control on your device is broken. Please see the bursar for a full refund.

[@sherazkhan2802]

Isn't the screw gauge precise to the second decimal point in millimeters ??? Then how come it is 12.105 mm ?

[@BedsitBob]

He estimated the fraction of the division.

[@laneyblenkin3271]

This helps very much thank you!! But where did you get the .105 from?

[@joshp6061]

Because it's halfway between the 10 mark (12.10) and 11 mark (12.11) on the barrel. The 0.005 is actually an estimation since it doesn't perfectly line up with the 10 or 11 marks, but it's better than recording the measurement as 12.10mm or 12.11mm since it's between the two.

[@Takemehome99]

Okay so I got the first measure of 12 right but I’m confused on the second measurement. What’s the sleeve line? I don’t understand where ya got 0.105 mm from?

[@newsmoommy]

I literally have to payse and play every second

[@JeromeJermaine]

Thank you so much

[@tonyarc9455]

I got 10.2 Im a FAILURE!!!! :(

[@Nico_417hz]

This background song is completely annoying when I’m trying to focus on what a micro meter does

[@jiuyuan106]

I do feel that the bgm is hyping me up so that I don't get sleep while learning this stuff xd

[@patrickkelley2014]

Yes, especially since we don't have the ability to mute it in app/browser on screen

[@cbarbadillo1]

Very clear explanation, thanks !!!

[@SMUPhysics]

Glad you liked it!

[@newsmoommy]

Buh it was useful anyways thanks

[@apsaraarawpola3191]

good job

[@Tech10you]

Why noise music Ganda

[@frounier2258]

Tank you

[@JoseRodriguez-jh5mb]

How u get the 105mm?

[@baruchben-david4196]

I like the music...

[@apsaraarawpola3191]

very helpful

[@ninjaarmy9943]

1

[@Tech10you]

And thank you so much

[@JohnUk65]

thanks for this ..its a big help thank you!

[@TotallynotRyuji]

Why do we add .05??

[@thomashverring9484]

Perfect video (the music adds the final point to a 10/10!).

[@leathaface187]

Closing the faces of the micrometer will damage them. There should always be a gap between them.

[@SMUPhysics]

Agreed that they should never be forced closed. The ratchet at the end should allow you to close them safely.

[@BedsitBob]

@@SMUPhysics I think Boogies24 means for storage.

[@mazeemadaline3091]

God bless you

[@gabrielcundari3104]

haha best quality video I've found on the topic but yet has no commentary but music like da fuq (still understanding thanks) and just realized this metric

[@dimondc24]

This really helped! Now I know how to use a Micrometer for school

[@saifullahhatami9437]

w video

[@66ElCamino357]

Excellent tutorial, thank you....

[@samstephens891]

very helpful, music really puts you in a measuring mood

[@redwanshah6483]

music gave me depression

[@Mike-pv3hg]

Lol go listen to maralyn manson somewhere else you sewer rat

[@askaryerzhanuly9891]

hey I know it's a physical channel but I learned how micrometers work and watched this video just to know "if we can possibly measure cells of an organism?" which are mostly between the range of 10-100 microns. and it seems like this tool's accuracy is 10 microns but really? can we really measure a cell with it? any answer (and from anyone) will be appreciated!

[@aliabdullah1835]

wouldn't the cell get squished by it?

[@miaa4937]

why the music on this video tho ?

[@uyenhoangnguyen3231]

because it is physics core

[@chrischen1535]

Thank you for your video, just one question. In the video, the length you measured is 12.105mm, but on your micrometer, it says "0.01mm" which means that the smallest scale should be 0.01mm, so I thought the 0.005mm should not be included in the length and it should be measured as 12.10mm?

[@RitaDevi-lh8ti]

Chris Chen yups... i also have the same doubt

[@davidgruty]

I understand this is because it is in between the two lines. the 0.01mm are the marks

[@hussam9044]

Listen, so yeah the lowest division line is 0.01 mm. When you have a line exactly between the two divisions then the lowest measurement you can take is half the uncertainty value for the lowest division. If you have a ruler that can measure values to the nearest 1 mm then values should be taken in consideration of half that value. So you are able to record for 0.5 mm. Only 0.5 mm no other number since that's half of the lowest scale reading on the ruler.

[@BedsitBob]

You estimate the fraction of the division. *FYI* Many imperial micrometers measure, not to 1/100th of an inch, not even to 1/1,000th of an inch, but to 1/10,000th of an inch.

[@MrMalawk]

Thank you so very much for the help with this video I really appreciate the assistance with this quick "How To Use" explanation when using a Micrometer

[@SMUPhysics]

Glad it was helpful!

[@yasandslay3912]

watching this, exam in less than an hour lol

[@SMUPhysics]

Hope it went well!

[@yasandslay3912]

@@SMUPhysics haha we didnt get a micrometer question, but it went well and the video was also very helpful :)

[@neilfurby555]

Slow down, and reduce the music volume... give me a chance to attend to what is being demonstrated please!

[@SMUPhysics]

Hi Neil. I don't know your settings but you can reduce the music volume yourself with the volume control. As for the speed of the video, you can also control that in the KZbin player settings. Since all the info is in the video (audio is just music), you can pause and rewind without missing anything.

[@bensonsabu1423]

This music is steal away, reprise

[@uyenhoangnguyen3231]

thank you for helping me out with my ib physics practical

[@SMUPhysics]

Happy to help!

[@wyattandwill12]

Thanks! I’m doing an engine rebuild and just ordered a set. I’d watched it before but didn’t figure it out, this time I did.

[@SMUPhysics]

Glad you found it useful!

[@NoIDa-cq6jh]

How you figure out is 12.105mm and not 12.104mm or 12.106?

[@BedsitBob]

He estimated the fraction of the division. It was pretty much in the middle, hence 0.005mm With practice, you can estimate to 0.0025mm, or finer.

[@malts100]

Hello i still cant get the 0.105 measurement pls reply.. thanks!

[@BedsitBob]

He estimated the fraction of the division. It was pretty much in the middle, hence 0.005mm With practice, you can estimate to 0.0025mm, or finer.

[@antypanag1]

very well presented !!! well done !! thanks a lot !!!!

[@SMUPhysics]

Thanks for the kind words!

[@antypanag1]

@@SMUPhysicsyou are welcome my friend

[@abdelrahmanabdelghany646]

thanks a lot

[@AliAli-iy1ig]

Well illustrated

[@kalpakbagi5049]

Thanks a lot for this vedio this really helps

[@osamaamir8583]

nyc track whats its name

[@mcf1933]

Great video! But I think where I'm still confused is the ratchet. How do you know how many times you should turn the ratchet when measuring?

[@SMUPhysics]

The ratchet will stop closing the micrometer when it meets resistance. So it doesn't matter how many times you turn it once it starts clicking.

[@AbuAlhasan-117]

Thanks

[@dewnifernando110]

Thank u was really helpful

[@prarthanapaudel7293]

thank u soo much

[@govinddumbre4344]

Really helped in exams

[@prakashbhattarai4113]

that music tho

[@BedsitBob]

"Close the spindle and make sure the zero line on the barrel lines up with the line on the sleeve." But you don't say what to do, if they don't line up. Also, at the end of the video, you left the spindle in contact with the anvil, which isn't a good way to store a micrometer.

[@tariksleftnut]

there's a little hole on the sleeve. You'll need some sort of a spanner to fix it. Turn the barrel all the way to 0. Now take you're spanner, put in the little hole and turn the sleeve in such a way that it coincides the sleeve 0 to the 0 on the barrel

[@BedsitBob]

@@tariksleftnut I know that, but don't you think it would've been a good idea to include it in the video?

[@tariksleftnut]

@@BedsitBob yeah probably, but in most schools/colleges where they need to perform this experiment, they just take it positive zero error / negative zero error according and just calculate the lengths. So even if there is zero error, you could just change your formula/calculations accordingly instead of correcting the zero error.

[@BedsitBob]

@@tariksleftnut Very complicated approach, which increases the chances of making a mistake. Far easier to simply zero out the micrometer.

[@tariksleftnut]

@@BedsitBob As a student, if you know the formula, it's not that complicated at all. You just have to subtract the zero error from the measured value, that's it. Saves time, easy and comes in handy if you dont have a spanner to adjust it.

[@bensonsabu1423]

Nice video .

[@SMUPhysics]

Thanks!

[@alishayang2863]

love the music

[@SMUPhysics]

Thanks!

[@TheCyndicate]

👎🏻 - Maybe don't blare the music.

[@SMUPhysics]

The music is only as loud as your speakers make it.

[@TheCyndicate]

@@SMUPhysics , so you're a supposed physics person, denying relativity. 🤡

[@rabbitreincarnate7775]

Too Fricking fast, i can't concentrate on video and read at the same time

[@SMUPhysics]

Sorry about the speed. It is possible to play it at slower speed or you can just pause it while you process the info.

[@hamshank29]

Umm so pause the video. Jeez, have some initiative

[@sharmass3756]

u have not mentioned about how to measure zero error

[@JMarwah]

+Sharma SS That's obvious. Keep rotating the ratchet until the barrel stops and note the measurements at that time. the sleeve will be at 0 so you just have to find whats on the barrel to get the zero error (it will be 0.___ where ___ is the number you got on the barrel). Then you just subtract that number from all your readings to correct the zero error.

[@benellimon]

+J. S.M. (Zantorym) Yes, but is it not the case that micrometers are measured against standard size block to verify accuracy? This is not "zeroing" the tool, technically, but it is still quite important. My understanding is most machinists do this at least once every calendar quarter (4X per year).

[@JMarwah]

+Tom Renda as far as I'm concerned that is not done in the 11th grade physics practical finals. pretty much every Indian watching this video is here due to their exam.

[@sharmass3756]

J. S.M. yes I am a grade 11 student .They ask us to measure even zero error also

[@websolutions6117]

Great vid, did not know about zeroing. Thanks.

[@chicku975]

Awesome Music

[@SMUPhysics]

Thanks!

[@hoors_viewpoint]

well explained👍👍

[@shahkhuram7280]

nothing was explained

[@maryamdaud4840]

Why would you add music???? Just ruined all my concentration

[@SMUPhysics]

All the explanation is visible in the video. You can turn down the audio and miss nothing.

[@prajwalbdvt7742]

thank you.this is the easiest and simple way

[@dhimanmarapana8793]

The damn music is distracting

[@SMUPhysics]

Just turn it off. All the info is in the video and subtitles.

[@nobodynobody6432]

this music is really annoying

[@SMUPhysics]

That's why they invented volume control! Plus, since there's no narration, you won't miss any of the explanation!

[@ultimatepirate9589]

+SMUPhysics i find the music quite good i actually wanna know the song name

[@nobodynobody6432]

+SMUPhysics still i think it's annoying...it gives me a headache

[@sean_tristan31]

lol you can just mute that you know

[@gabrielcundari3104]

Nobody Nobody agreed wrong setting for the music like it's okay music just wrong setting