The Science Of Roundness

Every single one of the 3.5 trillion miles in the US are made possible by the hundreds of rotating parts that enable a vehicle to drive down the road. The performance of these parts is a direct result of the advancements in the science of roundness.
If we take the fulcrum point of a lever and move it completely over to one end, duplicate it repeatedly, witch each copy sharing the same fulcrum; a new simple machine is formed - the wheel.
Wheels allow us to multiple distances, speed, or force based on how much leverage we put on their center point.
Wheels provide another characteristic that has been critical to industrial growth. The ability to reduce friction by transmitting forces at a single point.
Roundness, along with size play critical roles in how parts are specified, designed and fitted. However, roundness diverts from the standard methods of defining dimensions such as length, area, and volume. Roundness is more of a relationship between dimensions and must be measured in a completely different manner. The measure of roundness, as well as other metrics of dimensionality, is known as metrology - the scientific study of measurement.
The ability to verify the roundness of a part is absolutely critical to a component’s performance.
In the intrinsic datum method, the datum points used for measurement are directly taken off the part and it contacts point with a reference surface. Typically a flat surface is used for a single datum measurement or a V block for a two datum measurement.
A measurement device that measures the displacement of the surface, such as a dial indicator, is brought to the surface of the part and zeroed to a start point. As the part is rotated, deviations from roundness displace the measurement tool from zero, with surface peaks creating positive displacement and valleys negative ones.
The solution to the limitations of the intrinsic datum method is extrinsic datum measurement. Extrinsic datum measurement is done by assigning a rotational axis datum to the part and aligning it the circular datum of a highly accurate rotating measuring fixture.
The four common types of calculated references circles are:
Least Square Reference Circle (LSC)
Minimum Zone Circle (MZC)
Minimum Circumscribed Circle (MCC)
Maximum Inscribed Circle (MIC)
The Least Square Reference Circle (LSC), the most commonly used reference circle, is a circle that equally divides the area between the inside and outside of the reference circle.
A Minimum Zone Reference Circle (MZC) is derived by first calculating the smallest circle that can fit inside of the measured data. Then calculating the smallest circle that can encompass the measured data. The out-of-roundness is given by the radial separation between these two circles that enclose the data.
A Minimum Circumscribed Reference Circle (MCC), sometimes known as the ring gauge reference circle and is the smallest circle that totally encloses the data. Out-of-roundness is quantified as the largest deviation from this circle.
A Maximum Inscribed Reference Circle (MIC) is the largest circle that can be enclosed by the data. The out-of-roundness
is quantified as the maximum deviation of the data from this circle. This is sometimes known as the Plug Gauge Reference Circle.
When rotating parts are examined, especially by extrinsic measurement, harmonics of the part become a consideration. Irregularities that exist on a rotating part that happens rhythmically are known as undulations.
In 2011, the International Committee for Weights and Measures spearheaded an effort to redefine the kilogram, moving it away from antiquated reference objects. One proposal, pushed by an international team called the Avogadro Project, aimed to define the kilogram in terms of a specific number of silicon atoms. In order to count the atoms of the large silicon-28 crystal, it was ground into a ball and its volume determined.
Moving past man-made objects, let's look at the roundest object ever measured. In 2013, in an effort to study the distribution of charge around the electron, scientist at Harvard were able the measure the smallest roundness ever.

[@bluejack644]

Fun fact: The red tip on the end of the probe (in the thumbnail photo) is actually a precious Ruby gem. I was a machinist for several years and worked in the CMM room occasionally where precision parts were measured in x, y, and z axis. They use a Ruby tip on the probe because it can touch objects many thousands of times without wearing out or becoming disfigured or flattened on the end, from repeated long term use. It maintains a perfect surface tip for touching and measuring with precise accuracy for repeated regular use over extended periods of time, as an accurate precise measuring device. Once the probe touches a part in many points, in all axises the computer gets a picture of exactly what the part looks like, in order to maintain continuity of accuracy in the production process of the parts being machined.)

[@hazza2247]

very interesting fact, any reason they don’t use diamond? is ruby better somehow or is ruby simply just ‘good enough’ and cheaper?

[@theondono]

@@hazza2247 diamond coated tips are used in some very specific applications, but cutting a diamond into a sphere with tight tolerance would be hard.

[@hazza2247]

@@theondono makes sense, thankyou

[@Metal27928]

Same reason rubies are used as bearings and pivot points in mechanical watches.

[@volbla]

@@Metal27928 I was just about to ask! Watches are so cool. They're like a miniature engineering exhibit.

[@lewzero]

Wow, that "125 feet" comparison made me realize how incredibly well made ball bearings actually are. Amazing video, thank you.

[@HelloKittyFanMan.]

Bearing balls, actually.

[@harryharrison4876]

Well, as long as they’re not Chinese...

[@h3xagon488]

@@HelloKittyFanMan. Balling bears you mean

[@HelloKittyFanMan.]

@@h3xagon488: I _do?_ So you think you're a mind reader?

[@jeron9272]

@@h3xagon488 Nonono, its bear balls

[@ai4px]

This and the History Guy are what needs to be on Discovery Channel instead of all that reality TV programming.

[@octane613]

This is what it used to be like. It's what I grew up watching, and it truly expanded my way of thinking of how things are made, designed, etc.

[@pvic6959]

discover USED to be that. i used to spend so much time on it as i grew up in the early 2000s. its what turned on me onto science in the first place

[@frontiervirtcharter]

But advertisers are willing to pay more for the audience that follows reality TV, and the stockholders listen to the beancounters.

[@ijuvatar]

as a former specialist in the field of measurement technology i approve this video

[@alligatormonday6365]

Metrology is so interesting and important.

[@BillAnt]

@Steven Cone < You're right, especially for guys who like to measure certain parts of their body... if you know what I mean, ;D

[@shankarnarayan3118]

Your no one to approve the video

[@felixschrodinger7533]

Only thing I disapprove is the use of the imperial system. Especially when talking how accurate machine tools should be and the machines use metric.

[@AndreAnyone]

#$600OrWAR ! give us our fvcking money! “every society is just 3 meals away from revolution” March on Washington! surround senators homes 24/7 "the french aristocracy didn't see it coming either!" they have unlimited money for wallstreet and the banksters and wars but only crumbs for us ? time to rise up! DEATH TO TYRANTS ! protest with GUNS so what do you think is gonna happen when 50 million people start to get evicted ? you think they just gonna lay down and die?? lol they are going to burn Washington to the fvcking ground !!! jfj

[@kirara4953]

"The wheel is a bunch levers organized in a circle." Whoever invented the wheel got discredited so hard

[@firefox5926]

i think youre thinking of gears :P

[@fomalhaut_the_great]

@@firefox5926 watch the video before commenting

[@firefox5926]

@@fomalhaut_the_great in a brave heart-esque yell "NEVEEEEER" but on a more serious note i prefer to do a running commentary as a watch :)

[@the_hanged_clown]

too bad so sad wakanda

[@tensevo]

The wheel: I invented myself

[@ringlord13]

Got here from the Flatness video, this one is well done as well for a high level introduction. A great follow-up to this one would be a GD&T specific video on the differences between circularity (roundness), cylindricity, run-out, and total run-out. You may find your word choice in this video isn't quite as precise as it needs to be if you dive into that rabbit hole. Well done nonetheless.

[@samp-w7439]

Same here. I preferred the flatness video.

[@earthenscience]

around 5:00 they go on about "constant diameter" then go on some long winded explanation about circumscribed circles, instead of just saying to use constant radius. i quit watching the vid after that lol

[@lucasng4712]

@@earthenscience no

[@trackie1957]

I’m a retired mechanical engineer and I’m just loving your descriptions. Stuff that I’ve intuited you have expressed wonderfully.

[@erikjohnsen807]

I’m planning on studying mechanical engineering this fall, and these videos are getting me even more pumped for it.

[@matito_67]

oh boy just wait until finite elements, jokes aparts the best career in the word

[@theghostmachine]

By the time you finish your degree, I doubt you'll remember roundness measurements, unless you do a project in this subject.

[@VadersAprentice2000]

Wait until materials science. Hard as fuck but incredibly interesting.

[@dizzywow]

Patience. You've got a year of calculus and physics, first.

[@mrwess1927]

How is it going, don’t give up

[@Factory400]

Roundness is directly proportional to the volume of beer I consume in a given period of time. I am now perfectly round as I have optimized my consumption of beer.

[@the_original_Bilb_Ono]

I would like to apply to be a test subject to further your theory, Professor Ale.

[@alphabravo8850]

Lol

[@jamesbra4410]

Im surprised you can finish typing your comment. I would have probably rolled down the street.

[@Kev376]

Now to find out why my girl looks this way in... The Science Of Flatness

[@mal2ksc]

That's one sure way to get in shape. Round is a shape!

[@klazzera]

when you try to drill a thin sheet of metal, most of the time the drill hole is a reuleaux triangle. i never realized that this shape has a constant diameter, it all makes sense now since the drill bits are almost a line in their cross section.

[@klazzera]

follow up: i meant the regular twist drill bits. there are also special stepped drill bits for thin sheets that drill a nice round hole.

[@genelomas332]

@@klazzera Also, use a vise to hold the part, oil for lube, and go slow on the drill press handle.. assuming of course that the roundness of the required hole is important.. ;)

[@klazzera]

@@genelomas332 yeah also you can use a piece of oiled fabric between the part and the drill, not sure why it works but i saw it on youtube, better for big sheet metal structures when you cant use the press

[@dustinjames1268]

For drilling thin sheets I always put hardwood underneath and slowly drill through into the wood below The pressure from underneath keeps it flat and the slow steady follow thru keeps things round

[@klazzera]

@@dustinjames1268 that would also keep a steady center resulting in a circle hole

[@thelunchbox420x]

I just found you in my suggestions after watching a bunch of space videos and I'm glad you did. I love the information and how in-depth you go. Thank you for making all these videos, they are really interesting. You earned a new subscriber.

[@NC-oy8hq]

I used to have to change tools in a horizontal mill and tram them in to less than 50 millionths TIR , the set the front of the insert to 6-9 microns above the guide pads and about 15 microns below at the back ... I would say this is a very truthful and informative video

[@redpilled3569]

What type of indicators did you use and who was the work for, nasa?

[@NC-oy8hq]

Red Pilled mititoyo , and basic production machine shop. When your shoving a one shot boring bar ( no rougher ) that’s 4 fluted , pcd tipped , and 385 mm long down an aluminum part in 3.2 seconds holding plus or minus .015 microns on diameter , shit has to be straight.

[@RainBoxRed]

Was doing some reading and it seems the ways of manufacturing machines often use moore scraping to get them very flat. The techniques are amazing really when you get to that level where holding a part and heating it will give you measurable deviations.

[@tylercgarrison]

came here from the "science of flatness" video. This was just as good. Keep up the great videos my friend.

[@joemathew7284]

Me too lol

[@barthooghwerff1682]

I love your approach to these videos how you start at the fundamentals and end with the limit. Very thorough!

[@snaproll94e]

I felt like I was watching the fundamentals of a GD&T class. Good stuff with great illustrations of principles.

[@LaGuerre19]

The roundness of those silicon spheres at the end is mindboggling. Another great video; thank you!

[@FortisNome]

A few videos later, you have convinced me to subscribe! Keep up the great work!

[@PPYTAO]

My new fav channel! Keep up the amazing content, you’ll blow up in no time.

[@DougDingus]

These are well produced, concise, informative, and inclusive. Well done!

[@motonol_409]

this is pure gold. bestexplanation of the mechanical engineering basics ever!!! keep up the good work

[@kerryh8er04]

Your metrology video's are great. Really clear and concise.

[@jmchez]

This was great! I love details of precision machinery, the science of metrology and ideas of quantum mechanics. You combined them all. Very well done. This channel and "Machine Thinking" go very well together.

[@Glenn.Cooper]

Really enjoy your channel! A great look at aspects of engineering and related topics that I haven't really seen covered - at least not so well.

[@captainkiddoregon]

Interesting timing on this video. I was just sitting here trying to figure out what roundness callout to be measured on a SLA pattern we just built. Not that the video gave me that number but it was still educational. Thank you.

[@ezzywill7467]

I like your use of terminology with explanation. Many of my colleagues including myself in the manufacturing industry refer to these different types of measurement incorrectly and resulting in confusion regarding this very subject. Thank you

[@yoddlegcoin]

Awesome channel, so glad it got recommended to me. Keep up the good work!

[@zvisger]

This channel makes the best content. He makes it feel as prolific as it is.

[@FilterYT]

I'm new to this series, thanks for sharing such great content!

[@ttiff97]

More GD&T videos please!! As a recent MechE grad these are super helpful in improving my understanding of GD&T

[@ag135i]

This is a different and unique video video from the regular mainstream videos in a good way I mean, thanks for the informative video.

[@gambero972]

Master piece! You just made a summary of 2 semesters of my engineering course.

[@bentonrp]

Your no nonsense approach is refreshing indeed.

[@aahillakhani399]

It's crazy how the intro could be a short video on its own. My new favorite channel

[@BrianHoff04]

I measure this stuff everyday and believe this is a terrific video to explain to the production folks exactly what we are measuring and how that measurement is being made. Thank you.

[@SonOfAntalis]

I am late to the party. Your videos are amazing. Great quality, narration, information distribution, and length.

[@truevision1463]

The reason why the wheel reduces friction is because when a wheel is rotating, without any force being applied on it, the point of contact is at rest when compared to the ground. This is because the point of contact has two components to its velocity, one the linear motion of the wheel, and two the rotational component, which are equal and opposite to each other, when the wheel is perfect rolling. And since there is no relative motion between the wheel and the ground, there is no friction. Also the frictional force between two surfaces only depends on the normal force between them, and the materials they are made from. It is independent of the surface area of the contact

[@peetiegonzalez1845]

The friction remains at the axle but is easily overcome thanks to the leverage offered by the wheel.

[@HotelPapa100]

What you say about friction is a theoretical concept laid down in Coulomb's law of friction. It does not hold up to close scrutiny in practice; the coefficient of friction is NOT constant. Both speed an pressure have an influence. As for no friction between wheel and surface: again, this is an assumption of perfection. The touching surfaces are not infinitesimally hard; they deform on contact. As there is hysteresis between compression and release, the center of force of the contact area is shifted from the point exactly under the axle of the wheel, resulting in a small distance that acts as a lever. Rolling friction thus is sometimes expressed in terms of that "friction radius"; this concept explains why larger wheels roll more lightly, (that, and the fact that they re less disturbed by imperfections in flatness on the surface they roll on.

[@peetiegonzalez1845]

@@HotelPapa100 That's totally irrelevant to the point in the video about leverage. If your wheel was the same diameter as your axle you'd have a hard time overcoming the friction. With a large wheel on a small axle you have leverage making it much easier to overcome the friction, because there's less distance for the rubbing surfaces to travel against each other, and more force (torque).

[@HotelPapa100]

@@peetiegonzalez1845 I was replying to Sankar Manoj. That the lever in a wheel is hidden in the ratio outer diameter to bearing diameter is kinda obvious if you analyze the problem a little more in detail.

[@aculasabacca]

Great job, Best I've seen in a while, on any subject.

[@ItsJarred260]

You give people such a good understanding of what I used to never be able to understand

[@peteroleary9447]

Great video! I'm glad these are showing up in my recommended. These videos make a great compliment to the Machine Thinking channel. FIM (full indicator movement) is slowly replacing TIR on engineering drawings. I would've liked to see discussion of roundness vs cylindricity vs sphericity. Roundness has a somewhat transcendent quality because it only exists in 2 dimensions and doesn't exist in a 3D world.

[@jmchez]

The "Machine Thinking" channel is the first thing that came to my mind. They both, do indeed, go well together.

[@janvanruth3485]

3d roundness= a ball

[@philhawtin5269]

I really appreciate you doing these videos. Thanks

[@RichardBaran]

Wow I can't believe you don't have more subs. Excellent content!

[@qutaara3454]

Why this channel has only 300k ! Explanations are astonishing! Luv it

[@WildmanTech]

Excellent treatise! I wanted to do this on my channel, but I like your's so much I'll just send people here!

[@trudyandgeorge]

Just a great channel. Keep it up mate.

[@ConceptHut]

Very well done videos. This is probably my fourth. Next up, The Evolution of CPU Processing.

[@AlexLopez-gn8qc]

I took metrology on my first semester of college, was the best class. Something so natural as measurements can be so unique

[@blabby102]

Really nice video. But if you are talking about metrology at such a high level, why on earth don't you use metric?

[@ajinprakash9763]

True though!!!!! Anyways great video.

[@RainBoxRed]

Although I agree, it isn't really an issue as the conversions are all exact and this video is more about the techniques rather than the units of measure. And I hope they use metric on the ISS.

[@genelomas332]

@@RainBoxRed dude, of course they do.. EVERYONE uses metric, except most of those stubborn buggers on the other side of the Pacific, and half their northern counterparts.. ;)

[@AirCrash1]

Good point and the USC is not a true measurement system as it has no references other than to the Metric system. The USC is a trade barrier employed by axis of evil countries like the USA and North Korea.

[@adoatero5129]

I'm just a layman, but in the middle of the video I too begun to feel that something is not quite right. At first I couldn't put a finger on what it is, but a little later I realized that it's the words "science" and "inches" used together. It doesn't ruin the video at all (I think the video is very good). It just feels a little off. On the other hand it's easy for me to notice, as I live in a "metric country". I have a great sympathy towards those people who don't learn to use the metric system as children, and for some reason have to learn it when they are older. The metric system is of course easier than the imperial system, but you still have to "grow" to it to feel comfortable using it. I'm glad that I don't have to learn the imperial system - that would be torture. Well, I know that one mile is about 1,6 km, and an inch is about 2,5 cm, but that's about it :-). And of course the actual torture aren't the units themselves, but counting and converting between them.

[@sean..L]

This is so interesting, I would have never even wondered about this stuff.

[@halonothing1]

Wow, I watched 2 videos on curves,solids of constant width like rouleaux triangles yesterday. I didn't expect to see them again in this video. I just came across it while binge watching other videos on this channel. I wasn't actively looking for anything about rouleaux polygons.

[@tensevo]

Great video mate, it would be good to see you cover more mechanical engineering topics.

[@paul_fredrick]

Great job explaining stuff. Feynman would be proud.

[@RacingTIR0]

TIR0 I came up with this user name some 20 years ago. Over time I found out dozens of meanings of the word which always fit me. And you just unraveled another one, the biggest meaning so far. And it fits me again perfectly since I’m a notorious perfectionist.

[@kaylor87]

Watched the flatness video a couple weeks ago, so of course, YT has been suggesting this one ever since. Can finally say, I'm glad I watched it! Sub'd after this one as well, thanks for the content!

[@ahndeux]

Congratulations! This video was better than Melatonin in putting me to sleep. 5 minutes into it, and it was lights out!

[@jennyanngarcia1031]

This video is informative and helpful.. ..been looking and searching for some information that i can learn to solve my problem about unsble rondness ... many mechanical set up and replacement of machine parts and toolings were done , leveling of machine and runout checking of spindle were conducted.. yet same problem still occur most frequently.. i just hope, this channel.can give.an additional advice and solutions.. thank you..

[@aledirksen01]

So I was watching the vid and thought it had a lot of interesting concepts in it and it all in that 4 mins. Nice vid and then I notice, that was just the INTO. Holy I will keep looking and will probably get my mind blown!

[@genin69]

love your content.. i would love a video on the science of structural engineering and why certain structures are stronger etc.. the videos on that subject on youtube are really really bad..

[@mikefelber5129]

Finding not only a fulcrum that could be strong enough to life the rock in the initial example & a force that could reach the height of such a long fulcrum are major considerations. Love these videos- Roundness, flatness- I didn’t even know ovality was a word! Soundly like an arthritis medication lol. #RockOn #KeepLearning

[@satyris410]

My life is complete, a video that uses "datums" as the plural of "datum" and "data" as singular. I'm just playing, I love this creator, one of the absolute best on YT

[@blueckaym]

I really like how you start with the basic concept, and definition and step by step go thru different fields using the same or similar concept. For me it's really eye opening when I can compare different scenarios and find the commons or differences. Keep it up!

[@jimsvideos7201]

Those Avagadro spheres warm the cockles of my heart.

[@xtremepowerpaul]

Great explanation. Thanks.

[@danieljakubik3428]

Impressive ending and throughly educational!

[@morkovija]

Gotta subscribe for some of that sweet quality content

[@manavdeepsingh8372]

As always great video.

[@groupchat2554]

Seriously amazing work.

[@landenevans4938]

That was a well Rounded video!

[@YISP7]

I was like: Oh, quite interesting video. Cool hope there is mo... Oh, that was just the 4min intro :>

[@recklesflam1ngo968]

loving this channel

[@EchoDafunk]

Thanks for the info. I feel a little smarter. 💪😎

[@sasquatchhadarock968]

Got a job as a machinist a couple years ago and they made us watch these cringe-ass corporate training videos from the 70s/80s. They ought to be using these videos. 👍

[@ryanburbridge]

Awesome video. Please do a video on the watt balance. You know the way they redefined the kilogram instead of the cesium atom

[@justinberdell7517]

Great videos! I just subscribed!

[@quosswimblik4489]

You can use circles to measure more in depth thermal and electrical properties of circuit layouts and place/manage the devices and required logic better.

[@edwincloudusa]

He already got me mesmerized in the first 4 minutes when I realized it was just the intro!

[@zachcrawford5]

A constant diameter doesn't constitute roundness but a constant radius does.

[@pork_cake]

True, but as he mentioned in the video an axis or point of rotation is not always available or useful in metrology, which is why the circumscribed/inscribed circle method is the preferred fundamental principle.

[@zachcrawford5]

@@pork_cake I didn't quite understand how you find those circles with out a physical center.

[@SlyNine]

@@pork_cake but how do you know you created a circle to measure if it's a circle?

[@mad-cyantist3159]

Great video. Such a simple thing runs our world.

[@Aufenthalt]

These are videos which make KZbin a better place.

[@ProjectPhysX]

I've seen one of these silicon spheres in person. There are 7 of them in total. That thing is really round and shiny!

[@alexanderSydneyOz]

Question: the out of roundness derived from the 'minimum zone reference circle', the 'maximum inscribed reference circle' and the 'minimum inscribed reference circle', are all the same number, unless I am missing something. If that is so, is there any useful conceptual difference between them? Thanks

[@ralphdoggie]

2:33, this double's the torque at wheel A's axle, not B's. 2:59, the reason a wheel reduces the effective coefficient of friction is NOT because only a small area of the wheel makes contact with the road. It IS because the vertical force on the axle bearing is (essentially -- see below) the same as the force between the wheel and the road. If the wheel is rolling, the sliding friction force acts on a lever length equal to the radius of the axle bearing, whereas if the wheel is sliding, the sliding friction force acts on a lever length equal to the radius of the wheel. The friction is reduced by the ratio of the two radii. Note that the above is for the simple case of same coefficient of sliding friction in the bearing and between the wheel and road, a simple sliding bearing (versus roller or ball bearing), and uses an ideal wheel (as mentioned in the video) that doesn't deform under load, and has zero weight (even real wheels weight much less than the loads on them).

[@Penguin_of_Death]

The word 'doubles' does not need an apostrophe

[@joelsterling3735]

Nice presentation, dude. I want you on my team for sure.

[@TheAlison1456]

This channel is one year old and already has such quality videos. It's like the new Vsauce but without too drastic tangents. Though, it'd be good if you cited sources and additional reading in the description alongside the transcript. Possibly through another URL such as google docs.

[@DEtchells]

Really fascinating (as always)! I’m curious how they get to “first principles” roundness (for lack of a better term). For example, the metrology setup used a probe and a rotating stage. How do they know that the rotation of the stage is perfectly circular? I guess that’d be when it has zero TIR, but what if deviations in roundness of the stage just happen to correlate with opposing deviations in the bearing supporting it? The info on bearings was eye-opening, I had no idea they could be so perfectly spherical(!)

[@LeoStaley]

goodness I love your videos so much

[@09NXN06]

I welcome this with exceptional insight!

[@realitygaming7982]

Yet another amazing video

[@jameswiblishauser9745]

this is so cool. subscribed.

[@trackie1957]

Fascinating video. Runout is not necessarily caused by out of roundness. At 8’22” a shaft with a smaller journal is shown. If both cylinders are ‘perfectly round ‘ but their axes are not concentric, non-parallel, or both, runout will be present. In this demonstration, the runout decreases as the indicator was lowered. Either the journal was less round at the shoulder than its tip or its axis was not aligned with the body of the shaft (or the specimen was not held properly in the fixture...).

[@dominicjose3660]

6:07 wow, you just explained the concept of circularity tolerance so easily...

[@holton345]

You guys scienced the hell out of this.

[@yomybutthurtzzz8051]

I use a manual revolution plug gauge at work and work with tir everyday.....thx for the video

[@SaiVihtooMyint]

Left the field of engineering but did really well in college Metrology, I always appreciated metrology and the precision of things we can make

[@nickandersonco]

The animations are so good, how do you create them?

[@njenga.n.n]

Thanks for this vids..

[@nbaua3454]

This video can be a semester project highlight.. nice

[@carterredfearn4249]

I just started my career as a CNC machinist. This video was absolutely entertaining and incredibly informative. Thank you for producing such a wonderful video!

[@philzail2532]

FNG

[@michallacki9462]

Great video ! Could you include metric measurements as well ?

[@dr.blauerkraut]

L+Ratio lmao Get 360NoseFucked N00b gg

[@mraxilus]

Full agreement, I'm surprised that more people aren't upset about this.

[@EdgedPixie]

It's amazing that some chill music made me sit through a lecture on metrology. ...I'm a computer science student.

[@ndyce]

@ 9:05 I experienced an endorphin kick when seeing the dial gauge shape up to 5 to 1. Having spent the last six months dialing in bicycle disk rotors seeing something go from 5 to 1 on a dial gauge makes happy. ROUNDNESS!