The Science Of Flatness

2019 ж. 20 Мау.
3 410 301 Рет қаралды

Flatness is an often misrepresented property of our own intuition. Many of the objects we consider flat, pale in comparison to surfaces manufactured to actually be flat. It's also a property that our industrialized world relies on to function.
While most of us experience flatness as part of aesthetics and ergonomics, flatness in manufacturing is a critical property of positioning, mating and sealing parts together. The high pressures produced by combustion are contained by two mating flat surfaces aided by a gasket.
Let's look at a sheet of float glass. The floating process self levels the glass, giving it a relatively flat, uniform thickness.
Let's say a manufacturer's specification calls for a 3mm thick sheet of glass. For a sheet to pass a quality check, its thickness is sampled at various points along its length and as long as it is 3mm thick, plus or minus a specified tolerance, the sheet passes.
But what if during the process of moving the floating ribbon of molten glass a subtle disturbance is introduced to the molten metal. Let's say this disturbance imparts a 0.25 mm wave-like undulation throughout the entire ribbon. Now to eye the cut sheets would appear flat and they would pass the quality check for thickness, but the surface of that sheets of glass is far from flat.
Flatness isn’t derived from how closely a part matches its specified dimension. It is a property completely independent of the part’s gross shape.
If we take a surface and sandwich it between two imaginary parallel planes. The gap between the planes that encompasses the surface is known as a tolerance zone. The smaller this distance the flatter the specification.
On parts that do explicitly define flatness the method of both measuring and producing flatness is determined by how tight of a tolerance zone is required.
Flatness specifications down to around 10 microns or about 4/10,000th of an inch are quite common in machinery.
Those mating and sealing surfaces found in car engines can be found at this level of flatness. Sealing in fluids at this level of flatness requires the use of a gasket.
Field testing flatness at this level is done with a known precise flat edge and a clearance probing tool known as feeler gauges.
Actually measuring the flatness of a surface is a lot more complicated. An obvious solution would be to measure the surface against a flat reference. For example, if a part has a surface parallel to the surface to be measured it could be placed on a surface plate. A surface plate is a flat plate used as the main horizontal reference plane for precision inspection. A height gauge could then be used to probe the top of the surface for flatness relative to the surface plate.
If we first place the part to be measured upon 3 columns with adjustable heights. Then, with a height gauge, run the probe across the surface while looking at the amplitude of the needle, we get a snapshot of the difference between the highest and lowest point on that surface.
Automating the process with the use of a coordinate measuring machine or CMM is a common practice. CMMs are typically computer-controlled and can be programmed to perform the tedious repetitive measurements.
Going beyond the 10-micron levels of flatness requires the use of surface grinding. This process typically used to produce precision parts, precision fixtures, measurement equipment, and tooling.
Lapping is the process of rubbing two surfaces together with an abrasive between them in order to remove material in a highly controlled manner. In lapping a softer material known as a lap is "charged" with an abrasive. The lap is then used to cut a harder material. The abrasive embeds within the softer material which holds it and permits it to score across and cut the harder working material.
Wringing is the process of sliding two ultra flat faces together so that their faces lightly bond. When wrung, the faces will adhere tightly to each other.
This technique is used in an optics manufacturing process known as optical contact bonding.
When an optical flat's polished surface is placed in contact with a surface to be tested, dark and light bands are formed when viewed with monochromatic light. These bands are known as interference fringes and their shape gives a visual representation of the flatness.
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Joe Pieczynski - How to Accurately Inspect a Flat Surface
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Пікірлер
  • To everyone wondering why the video cuts off abruptly, I lost the last 2 seconds of my audio file. It's supposed to end with "At these scales, the definition of flatness quickly becomes moot."

    @NewMind@NewMind4 жыл бұрын
    • Never apologize, you are a perfect ray of sunshine.

      @hipser@hipser4 жыл бұрын
    • Top marks for the way you explained how to get a reference surface without getting bogged down into datums and such. Also, I have the same set of old Russian optical parallels, I just need to find a lamp for them, my LEDs aren't monochromatic enough.

      @paint4pain@paint4pain4 жыл бұрын
    • Great video. Thanks for explaining the missing end.

      @jimviau327@jimviau3274 жыл бұрын
    • What about a reupload?

      @AlessioSangalli@AlessioSangalli4 жыл бұрын
    • I thought it was deliberate and brilliant!

      @si98justme1@si98justme14 жыл бұрын
  • So, when flat earthers claim the earth is flat, maybe they're just working with higher tolerances...

    @timorieseler276@timorieseler2764 жыл бұрын
    • Incredible. This man needs to be the next President.

      @jongwookmah603@jongwookmah6033 жыл бұрын
    • The earth is flat in the context of a human being. The sun also revolves around the earth from our perspective. It isn't accurate to take only the scientific perspective.

      @silo3com@silo3com3 жыл бұрын
    • @@silo3com From our perspective, the sun merely moves across the sky. It's science that tells us otherwise!

      @martynridley3671@martynridley36713 жыл бұрын
    • @@martynridley3671 Indeed! Science - so called. Nowadays men believe what used to be called the "idiot box" instead of their own eyes!

      @colemanadamson5943@colemanadamson59433 жыл бұрын
    • @@colemanadamson5943 'so called', 'idiot box'?...explain what you mean.

      @martynridley3671@martynridley36713 жыл бұрын
  • "The definition of flatness quickly become..." Become what.... BECOME WHAT?

    @alexisandersen1392@alexisandersen13923 жыл бұрын
    • moot (whatever that means)

      @kubacube342@kubacube3423 жыл бұрын
    • It doesn't really matter.

      @alexisandersen1392@alexisandersen13923 жыл бұрын
    • Endless

      @hawkhawkens6100@hawkhawkens61003 жыл бұрын
    • eight

      @alexisandersen1392@alexisandersen13923 жыл бұрын
    • Muh

      @cillacowz2668@cillacowz26683 жыл бұрын
  • "Do you want to experience true level?" -Rick

    @jeffklaubo3168@jeffklaubo31683 жыл бұрын
    • This is all I could think about watching this video.

      @micahlindvall285@micahlindvall2853 жыл бұрын
    • I came to the comments to find this comment.

      @ChargedTTq@ChargedTTq3 жыл бұрын
    • Funny enough, booth are not compatible. A perfect flat surface is not level because a perfect level surface mimics the gravitational force of the Earth.

      @Toxicity1987@Toxicity19873 жыл бұрын
    • @@Toxicity1987 listen here... captain buzz-kill...

      @jeffklaubo3168@jeffklaubo31683 жыл бұрын
    • The second I saw this video that's what I thought of.

      @james4wd236@james4wd2363 жыл бұрын
  • Nice video, but it ended flat.

    @realhealthquotesllc2195@realhealthquotesllc21954 жыл бұрын
    • your whole life is flat

      @hipser@hipser4 жыл бұрын
    • @@hipser Your head is flat :(

      @phillhuddleston9445@phillhuddleston94454 жыл бұрын
    • Real Health Quotes, LLC ..... You mean it left you feeling flat

      @neriksen@neriksen4 жыл бұрын
    • The Earth is flat. Wake up!

      @WernerBeroux@WernerBeroux4 жыл бұрын
    • @@WernerBeroux you're asleep at the wheel-sphere

      @canlib@canlib4 жыл бұрын
  • The gaskets aren't just for imperfect surfaces. They are for materials that grow, shrink and warp with heating and cooling... Every component in an engine bay for example.

    @jonanderson5137@jonanderson51374 жыл бұрын
    • Especially dissimilar materials that expand and contract at different rates (e.g. iron block and aluminum head)

      @PhthaloType@PhthaloType4 жыл бұрын
    • Very true.

      @Rubixdecampo@Rubixdecampo4 жыл бұрын
    • Old air-cooled Porsche engines don’t even use head gaskets. They rely on the thermal expansion of the materials as the engine heats up,and the precision machining of the parts,to seal the combustion chamber.

      @RunDub@RunDub4 жыл бұрын
    • @@RunDub Which is why air cooled Porsches need a $17k rebuild/remachining every 17k or 3yrs.

      @dilligaf0220@dilligaf02204 жыл бұрын
    • Right, so it becomes imperfect somewhere along the lines =P.

      @MyriadSkies@MyriadSkies4 жыл бұрын
  • My wife says she's flat I told her she's within tolerance

    @MikeBova1@MikeBova12 жыл бұрын
    • 😂😂

      @Grannybang35@Grannybang352 жыл бұрын
    • @@albratgaming2348 I think we lost him bud!

      @jagtan13@jagtan132 жыл бұрын
    • @@jagtan13 sorry guys I had to sell everything to get her implants, now im stuck reading the comments at the local library

      @MikeBova1@MikeBova12 жыл бұрын
    • @@MikeBova1 you're alive! 👍

      @jagtan13@jagtan132 жыл бұрын
    • @@jagtan13 I'm still sleeping with one eye open because... you never know

      @MikeBova1@MikeBova12 жыл бұрын
  • I took a tour of NASA's Glenn Research Center in Cleveland, they created a sealed room with an absolutely flat floor, within some microns of tolerance. I can't remember what kind of testing it was used for but they seemed pretty proud of it.

    @tncorgi92@tncorgi923 жыл бұрын
    • It could be for the James Web space telescope. Smarter Everyday has a video about it.

      @DDKolt@DDKolt Жыл бұрын
    • At those tolerances I suppose it pretty much looked like a mirror

      @GeneralKenobi69420@GeneralKenobi69420 Жыл бұрын
    • Saying something is 'absolutely flat' is like saying a square is a circle. No such thing as something completely or absolutely flat.

      @SH-bl9wh@SH-bl9wh Жыл бұрын
    • @@SH-bl9wh Bruh, they specified "absolutely flat *within some microns of tolerance* " that's definitely not saying something as stupid as "a square is a circle" , and isn't even saying it's perfectly flat. Why be so pedantic?

      @alexh5725@alexh5725 Жыл бұрын
    • I like the idea of a NASA scientist hosting a house get together, boasting about his extremely flat living room. ‘Ya, its within 5 microns, using statistical sampling.’

      @p.g.3806@p.g.3806 Жыл бұрын
  • Morty knows true leveling.

    @LiezerZero@LiezerZero4 жыл бұрын
    • I know about the water and the bubble, Morty!

      @Yora21@Yora214 жыл бұрын
    • Rick

      @samuelvreede770@samuelvreede7704 жыл бұрын
    • and there it is lol!

      @adammada511@adammada5114 жыл бұрын
    • Lambs to the cosmic slaughter!

      @SpecialEDy@SpecialEDy4 жыл бұрын
    • I dabble in PRECISION

      @YanaiSachs@YanaiSachs4 жыл бұрын
  • I think you missed an important part of flatness which is the 3 plate method, who's discovery allowed us to create flat surfaces without the need for a known flat reference. We couldn't rely on any of the methods you showed in this video without the use of external flat references making up the machines and tools used to measure them. The 3 plate method gave us those first reference surfaces.

    @Volcanoelectricity@Volcanoelectricity4 жыл бұрын
    • Thank you, I am glad someone mentioned it, even though I had to scroll halfway through the comments to find one of the most important inventions in machining history.

      @RealHankShill@RealHankShill4 жыл бұрын
    • Thank you, I am glad someone mentioned it, even though I had to scroll halfway through the comments to find one of the most important inventions in machining history.

      @RealHankShill@RealHankShill4 жыл бұрын
    • I think I have an idea of what you mean by three plate method, but from Wikipedia's explanation, it sounds like it would only create a plate that is round, they could easily create a dome shape or a crater shape.

      @allennelson1987@allennelson19874 жыл бұрын
    • whose* discovery

      @goodkopbadkop9054@goodkopbadkop90544 жыл бұрын
    • @@allennelson1987 I find that Wikipedia often times has explanations that are technically some of the most correct definitions or descriptions of concepts, but not always a good explanation for someone unfamiliar with that concept. You are correct that if you only had 2 surfaces to rub together, you could eventually get them to mate to one another near perfect (or perhaps even perfectly), but that doesn't guarantee that you also have 2 surfaces that are flat, only that they mate/fit together perfectly. The 3 plate method successfully cancels out some of the "doming" effect as you called it (convex and concave surfaces) and with multiple cycles of choosing to rub different combinations of 2 of the 3 plates together, can achieve some of the best flatness achievable by mechanical means. This is going to be an over-simplification, but I think it could help understand the core concept of what makes the 3 plate method work. Imagine you had your first plate that was kind of dome-shaped. To clarify, that first plate is thinner on the edges and protrudes in the middle. When you rub it together with a second plate, it would make the second plate like a dome, but in the opposite direction, right? Like thinner in the middle and a little thicker on the edges, so that it matched and fit perfectly with the first plate. Well, do the same thing, but set the second plate off to the side for right now and bring in a new third plate to replace it. You'll be rubbing that same first plate, the dome-ish one against this new third plate until they fit together again, making the third plate pretty close to how the second one was, thinner in the middle, and thicker around the edges. At this point you set that first dome-shaped plate aside and focus on the 2nd and 3rd plates. What do they look like? Well, they've both got that anti-dome shape, where the edges are kind of raised and the center of the plate is a little recessed/sunken compared to the edges. These two plates are by no means identical, but they are close. If we were to set those two plates against each other, with their anti-dome faces in contact, what would be the surface that would come into contact? Since both have the edges protruding compared to the center, the edges of both of those plates would touch first. If you rub plates 2 and 3 together, you will be almost guaranteed to wear down the raised edges before you wear down the middle (there's proper techniques to follow here, but again, I promised a simplification). So now plates 2 and 3, after having their raised edges be the first thing to be worn away, you're left with 2 plates that have had quiiiite a bit of that dome-ishness removed from their surfaces. There's a ton of other interesting stuff going on, but hopefully this explanation serves as a foot in the door, and you can increase your understanding from there. I think important terms to understand that could help with reading technical literature on the subject would be: 'abrasion', 'bearing', 'concave', 'convex', 'plane'/'planar' Additionally, when I was super confused about the whole thing, I was able to find some pictures that finally made the core concepts "click" for me. Wikipedia doesn't always have illustrations that make the most sense, so if you don't immediately get it after reading a short, technically-worded summary, don't worry about it, keep searching for an explanation that you understand, and if you don't understand it, try to find exactly what about it is confusing you and search that concept, or just find someone and ask them how that things works.

      @williamhinrichs6558@williamhinrichs65583 жыл бұрын
  • *Me, an A-cup:* "Finally! A youtube video just for me!"

    @ShazyShaze@ShazyShaze3 жыл бұрын
    • Very nice pettan.

      @boncattoo@boncattoo3 жыл бұрын
    • Rushia wants to know your location

      @SinCosILoveIt@SinCosILoveIt3 жыл бұрын
    • I was waiting for this type of comment, ngl

      @wilsonwilson3674@wilsonwilson36742 жыл бұрын
    • You will never be a woman

      @justforshit57@justforshit572 жыл бұрын
    • @@justforshit57 Redpilled

      @diobrando2160@diobrando21602 жыл бұрын
  • Tickles me now to recall the Metrology class back in the early '90's; where the statement that even the thought to be flattest surface, still sits on just 3 of its highest points.

    @soldtobediers@soldtobediers2 жыл бұрын
  • I see the KZhead algorithm has brought us all together again. I hope you’ve all been doing well.

    @dietcurt@dietcurt4 жыл бұрын
    • My happiness is immeasurable and my day is saved

      @kinga6347@kinga63474 жыл бұрын
    • Best comment of the year

      @zoesdada8923@zoesdada89234 жыл бұрын
    • I haven't! But thanks.

      @Asdayasman@Asdayasman3 жыл бұрын
    • It did it again. I was so surprised to see a comment of my own on this video, goes to show how easy it is to consume and forget.

      @diegohuijbregtsgarcia5102@diegohuijbregtsgarcia51022 жыл бұрын
    • They knew I would be one of the suckers who could not resist clicking on to the bait for a subject such as this.

      @stephenk.5839@stephenk.58392 жыл бұрын
  • Last two minutes really squashed this machinists mind. Good video.

    @APage-hn6cz@APage-hn6cz4 жыл бұрын
    • Austin Page i worked at a grinding shop for about a year. Those last 2 minutes were normal to me 😂

      @JohnD595@JohnD5954 жыл бұрын
    • Search for a video by Andor Gafotas titled "indistinguishable from magic: manufacturing modern computer chips". It's a talk from 2009 that does a really good job describing some of the crazy manufacturing that goes into modern chips, with thin film deposition layers measured in atoms and the result having to be within 2. As mentioned, the talk was in 2009 and he wasn't talking about trade secret cutting edge stuff even then, and its also relatively large scale manufacturing, not experiments in labs done for papers. It's about an hour long, though. Worth a watch.

      @randommcranderson5155@randommcranderson51554 жыл бұрын
    • only a machinist knows there is no truth, only "within tolerance"

      @Villains_Nate@Villains_Nate4 жыл бұрын
    • @@JohnD595 I sent this vidnto my gf as a joke 😏

      @stevethea5250@stevethea52504 жыл бұрын
    • Yeah, nobody but OOOOLD timers that don't understand new systems really do it like that anymore. Modern electronics do a better job, faster, and often cheaper than a good optical flat kit. Less maintenance, and cheaper calibration and certification too.

      @operator8014@operator80144 жыл бұрын
  • Very well done. As a retired Certified Mechanical Inspector and Metrologist, I found many people not familiar with GD&T would have a difficult time understanding flatness. They would always get it mixed up with parallelism. Flatness is essentially a characteristic measured to itself. I sure miss those days.

    @privatepilot4064@privatepilot4064 Жыл бұрын
    • Metrologists Unite! (We do not predict the weather)

      @howtoguro@howtoguro5 ай бұрын
  • I’ve had a pretty interesting perspective on flatness going from woodworking to becoming and engine machinist.

    @stephenkrambeck6589@stephenkrambeck65893 жыл бұрын
    • It very quickly goes from "eh, wood glue will fill the voids" to "yes it is perfectly flat but is it REALLY FLAT?!"

      @randoprior4130@randoprior41302 жыл бұрын
    • Totally opposite for me. I have been a tool and die maker for most of my career and now just getting into wood working. Needless to say it has driven me to the edges of insanity.

      @matthewcornelius5862@matthewcornelius5862 Жыл бұрын
    • @@matthewcornelius5862 Oddly, when your mind is working towards an exaggerated level of perfection, your woodwork will "pop" when completed. People will ask "how do you do that?" It's a culmination of many tiny compensations working together. Works every time too!

      @bryandraughn9830@bryandraughn9830 Жыл бұрын
  • This should be a required video to watch for mechanical engineering classes.

    @Nerfornothin111@Nerfornothin1114 жыл бұрын
    • This should be a required video to watch for flat earthers. They actually think the surface of the oceans are perfectly flat.

      @timhallas4275@timhallas42754 жыл бұрын
    • Not so much for mechanical engineering classes as for material science classes

      @T0BBi94@T0BBi944 жыл бұрын
    • I've had a Metrology class as a Machinist that taught me about these topics, it's actually sad that this is not mandatory for a mech eng, this is why i always say a great Mechanical engineer is one who was a machinist first.

      @misternintendoman@misternintendoman4 жыл бұрын
    • I kinda know 90% of the content already. So showing it would be highly appreciated but may not be as necessary as you think.

      @SuperDeinVadda@SuperDeinVadda4 жыл бұрын
  • I have a special butter knife I use to spread the atoms out evenly for perfect flatness. Only works with monochromatic blackberry jam, though.

    @BrilliantDesignOnline@BrilliantDesignOnline4 жыл бұрын
    • So if it doesn't work with butter, why call it a butter knife? Surely it is a monochromatic blackberry jam spreader knife

      @SuperDeinVadda@SuperDeinVadda4 жыл бұрын
    • I'd love to see a video on flattening peanut butter with your knife.😂

      @nowvalleydiorama885@nowvalleydiorama8853 жыл бұрын
    • @@SuperDeinVadda You are right: an MBJSK; make NASA proud using TLA's

      @BrilliantDesignOnline@BrilliantDesignOnline3 жыл бұрын
    • i feel like i am reading an scp file

      @2x489@2x4893 жыл бұрын
    • @@SuperDeinVadda it does amazing things with butter, too

      @BlackSoap361@BlackSoap3613 жыл бұрын
  • As a CMM programmer, it's always cool to see popular videos like this introducing people to what I do! Great video.

    @KnappstersaurusRex@KnappstersaurusRex3 жыл бұрын
    • do you know what the things at 9:30 and 9:40 are called?

      @SighsInternally@SighsInternally Жыл бұрын
    • @@SighsInternallygage blocks

      @kylez9094@kylez9094 Жыл бұрын
  • As someone who works in the engineering and manufacturing industry, I loved this video. I’m subscribing to this channel, I hope to see more of this kind of content here.

    @Ahmed4th@Ahmed4th4 жыл бұрын
    • nerd

      @traumatic_@traumatic_ Жыл бұрын
  • Geometric tolerances are incredibly important in manufacturing and design processes. Excellent presentation, keep making videos of this calibre sir!

    @DogClutch@DogClutch4 жыл бұрын
    • This is better explained than the labs of my manufacturing process courses and GD&T class.

      @epistte@epistte Жыл бұрын
  • "At these scales, the definition of flatness quickly becommb-" **has stroke**

    @GuidoHaverkort@GuidoHaverkort2 жыл бұрын
    • Some say he is flat on a bed to this day.

      @ADVBear@ADVBear2 жыл бұрын
  • Incredible video. Metrology is such an interesting field.

    @JaczSolar@JaczSolar3 жыл бұрын
  • quickly become moo? I knew cows ruled the world! goddamit

    @genin69@genin694 жыл бұрын
    • Cow pats are flat.

      @deadfreightwest5956@deadfreightwest59564 жыл бұрын
    • Moot.

      @nebtheweb8885@nebtheweb88854 жыл бұрын
    • “We love our Moo!”

      @Derpy1969@Derpy19694 жыл бұрын
    • 😂 😂 True i thought the same thing

      @fcfdroid@fcfdroid4 жыл бұрын
    • came down to comments looking for this.

      @shredo2@shredo24 жыл бұрын
  • The only way to obtain perfect flatness is to leave a bottle of soda out on the counter for a week.

    @nukeemwins4174@nukeemwins41744 жыл бұрын
    • Then it will finally be drinkable

      @koikoi9817@koikoi98174 жыл бұрын
    • Nope! It will be slight curvature (comparable to roundness of Earth) in there ;)

      @NuViss@NuViss4 жыл бұрын
    • pop*

      @theyseemeloling@theyseemeloling4 жыл бұрын
    • @@NuViss also will be curved due to the skin effect of the water that it is comprised of.

      @Colonel_Overkill@Colonel_Overkill4 жыл бұрын
    • Only if you open it first!

      @SH-pc4xt@SH-pc4xt4 жыл бұрын
  • 12:37 -At these scales, the definition of flatness quickly becom *ERROR*

    @alanwatts8239@alanwatts82393 жыл бұрын
  • Very well explained.. I think that all of this can only make sense once you've gone through trying to manufacture parts to flatness levels between 5 and 20 microns in large parts. We've found there's very few machine shops in the world that are capable of doing this work reliably over a long period of time. As you say, half the battle is actually measuring accurately in a repeatable manner.

    @peterraffin2227@peterraffin22272 жыл бұрын
    • Which sort of sophisticated industry are you working with?

      @OmmerSyssel@OmmerSyssel Жыл бұрын
    • @@OmmerSyssel mass spectrometry

      @peterraffin2227@peterraffin2227 Жыл бұрын
  • Thank you. This is my real job. You have present it very interesting and correct 😃👍

    @JanDrebes@JanDrebes4 жыл бұрын
    • Ok, but what's your fake job though?

      @ADOBEFXPRO@ADOBEFXPRO4 жыл бұрын
    • What do you do and how can I begin? You look very well off. :)

      @MatMabee@MatMabee4 жыл бұрын
    • @@MatMabee Find a trade school or community college that teaches machining or better yet, Metrology (Science of Measurement), though there are very, very, few Metrology schools. My graduates regularly start around $24 an hour and get very close to six figures (with overtime) within 5 years, after only two semesters of Metrology training.

      @ringlord13@ringlord134 жыл бұрын
    • Thanks for making flat stuff

      @ghoulbuster1@ghoulbuster14 жыл бұрын
    • @@ringlord13 curb your expectations, i maker under 16$ an hour with an BA at an NMI

      @linusteir@linusteir4 жыл бұрын
  • Aaah, mechanical engineers should watch this in their first semester

    @karoma7898@karoma78984 жыл бұрын
    • Mechanical Engineers should be exposed to this in their first internship.

      @inorite4553@inorite45534 жыл бұрын
    • @@inorite4553 if only we had a proper internship

      @arjun6358@arjun63584 жыл бұрын
    • Coincidentally, I'm in my first semester of an automotive engineering program.

      @diegohuijbregtsgarcia5102@diegohuijbregtsgarcia51024 жыл бұрын
    • Geometric dimensioning and tolerancing in drafting/CAD was the introduction to this subject to engineers.

      @epistte@epistte4 жыл бұрын
    • And any Machinists. I actually worked as a surface grinder, this video glossed over some details but it is exactly what we did. Really any soon-to-be machinist must learn this.

      @joser9237@joser92374 жыл бұрын
  • Imagine making an engine that is bonded by spontaneous cold-welding due to perfect flatness in a vacuum. You couldn't open it to check it I guess but fuck it, it would be impressive.

    @TerkanTyr@TerkanTyr2 жыл бұрын
    • Space manufacturing is going to be great

      @AJ213Probably@AJ213Probably2 жыл бұрын
    • @@AJ213Probably "I'm tired of this (lack of right to repair) grandpa!" Elon: "well that's too damn bad!"

      @timmyopally@timmyopally2 жыл бұрын
    • It would be cool if it worked, it would be good if the head and block were the same material otherwise heating and cooling would warp the surfaces and create a mess

      @clarence4343@clarence43432 жыл бұрын
    • I had an idea for a 3D printer using cold welding in a vacuum. The "pixels" would need to be cubes or something with a flat edge.

      @cyalknight@cyalknight2 жыл бұрын
    • Just wait til subie owners hear about this

      @chasethompson7392@chasethompson7392 Жыл бұрын
  • I work with similar stuff: roundness and straightness.

    @sethbettwieser@sethbettwieser2 жыл бұрын
  • as someone who gets structural design courses, and works at a tool manifacturer, this is amazingly well produced and well informed i love it

    @waveboard111@waveboard1114 жыл бұрын
    • Nobody actually asked a quality inspector. Tons of guessing going on in this video. It provides most of the basics but, we need more information on how the Flatness is actually called out. Is it to itself or in relation to other datum points?

      @larrylund2682@larrylund26824 жыл бұрын
    • Drafting 101 GD&T.

      @epistte@epistte4 жыл бұрын
    • I liked it, too. I worked in a GE Energy machine shop that had 16 CMMs, both in final inspection and on the shop floor. I did NDT but was enamored with all final’s cool tools.

      @jockellis@jockellis4 жыл бұрын
    • @@larrylund2682 Flatness is a form only control, it cannot have a relationship to datums. If a print references either the ASME or ISO GD&T standard and it had a feature control frame with Flatness AND datums, the print is in error and wasn't produced per standard. I agree that it is a great introductory video, but one getting into the level you are asking for would be significantly longer.

      @ringlord13@ringlord134 жыл бұрын
  • The beginning of this video reminded me of Joe Pera Talks You To Sleep

    @AnAmericanComposer@AnAmericanComposer4 жыл бұрын
    • Would enjoy hearing Joe Pera reminiscing about all the delicious holiday meals he's made on those lovely flat granite countertops.

      @michaelbook2019@michaelbook20193 жыл бұрын
    • Im here from school

      @zaidkhan7133@zaidkhan71333 жыл бұрын
    • The most under rated video on youtube

      @The_Real_Daniel@The_Real_Daniel2 жыл бұрын
    • A voice that is smooth and flat, within the tolerance zone, will induce lethargy which progresses to the suspended consciousness known as sleep.

      @stephenk.5839@stephenk.58392 жыл бұрын
    • I feel compelled to inform you that while watching this i fell asleep and dropped my phone on my chest. Then picked up my phone and immediately saw your comment. Real life never felt so scripted.

      @celticknotbrain@celticknotbrain2 жыл бұрын
  • being a machinist we use precision measurement tooling and there are some tables that we use specifically for measuring or hand sanding something. those tables are made out of calibrated slabs of granite.

    @jrodthegreat1@jrodthegreat12 жыл бұрын
  • the tight script and ambient music make for a very immersive experience!

    @Brightly2109@Brightly2109 Жыл бұрын
  • Hands down, one of the most unerrated channels. Thanks for the educative yet quality content. Just binge watched your videos. Congrats and cheers :)

    @studioWORKS97@studioWORKS974 жыл бұрын
  • I work for Keysight Technologies, and we manufacture glass in very high-end specification for laser measurement systems... I am going to go quiz the glass manufacturing team, because this was the coolest video!! I had no idea of some of the specs that could be reached with flatness!! Thanks for sharing!!

    @Retox5@Retox54 жыл бұрын
  • As a production tool maker/tool grinder. . . . you aced this video as far as I go. I've seen videos on how they shaped the hubble's telescope lens and it never ceases to astonish me how much more there is always left to learn in machining. We need to get more young kids into this field right out of high school and college because if we can't build, what are we?

    @kevinspacey5325@kevinspacey532511 ай бұрын
    • Parasites?

      @joea5228@joea52283 ай бұрын
  • Down the youtube rabbit hole again. Now I'm looking around my house and yelling my wife things aren't really flat. The looks im getting are priceless

    @NCshooter1213@NCshooter12133 жыл бұрын
  • Found this channel because KZhead algorithm "recommended" it for me. For once, KZhead got it right! Truly interesting subject matter explained about as clearly as possible and with good graphic support. A winner -- thanks.

    @jonrutherford6852@jonrutherford68522 жыл бұрын
  • Great video! As retired mil and new machinist, I found this very informative and well presented. While working on my education as a machinist I took several engineering and GD&T classes. Every little bit of info helps.

    @jim6265@jim62654 жыл бұрын
    • do you know what the things at 9:30 and 9:40 are called?

      @SighsInternally@SighsInternally Жыл бұрын
    • @@SighsInternally Gage blocks or Gauge blocks

      @IFearlessINinja@IFearlessINinja11 ай бұрын
  • As someone who works in a machine shop and deals with "the great struggle" daily, I can say this video was well done.

    @TheTarrMan@TheTarrMan4 жыл бұрын
    • "The great struggle". Yeah, that about sums it up. I'm in the same trade. Perfection is an unachievable goal that some of us struggle to achieve anyway. After tossing the manager in to the chip bin, and getting on with it... ;)

      @MrMccurley@MrMccurley4 жыл бұрын
    • do you know what the things at 9:30 and 9:40 are called?

      @SighsInternally@SighsInternally Жыл бұрын
    • @@SighsInternally Those are called "gage blocks". The ones at 9:40 appear to be ceramic (higher quality, ridiculously expensive) while the ones at 9:30 appear to be the steel "shop grade".

      @TheTarrMan@TheTarrMan Жыл бұрын
  • around 9:30 the concept of wringing... that blew my mind. I had a co-worker several years ago who used to work in calibration and described this to me as one of the tools they used, calibration blocks. That's incredible hat surfaces can just bond like that. I guess it essentially created a vacuum between the parts because they are such a precise fit even air can't get between them.

    @Chris119.@Chris119.2 жыл бұрын
  • These videos are a blessing when you have the day off work, and your neighbor gave you a special brownie.

    @carlosbarrientos7915@carlosbarrientos7915 Жыл бұрын
  • great video. the only thing missing is the beauty of hand scraped surfaces, which would add to the difference between flatness and roughness

    @delirio1987@delirio19874 жыл бұрын
    • Also, the "three plate method" deserves a nod in that context. Hand scraping (and lapping) combined with the three plate method is what gave engineering its first accurate reference surfaces for flatness

      @lordchickenhawk@lordchickenhawk4 жыл бұрын
    • @@lordchickenhawk The dawn of precision manufacturing.

      @bodyno3158@bodyno31584 жыл бұрын
    • @@bodyno3158 That is a wonderful video!!!

      @Industrialitis@Industrialitis4 жыл бұрын
  • Extremely high production value. Well researched and presented. Terrific work! Subscribed. Looking forward to seeing more of your work!

    @jadefalcon001@jadefalcon0014 жыл бұрын
  • I just retired after44 years in Aerospace Quality and Engineering. This is one of the best general explanations on this subject that I've ever seen. Great job !

    @BELCAN57@BELCAN57 Жыл бұрын
    • do you know what the things at 9:30 and 9:40 are called?

      @SighsInternally@SighsInternally Жыл бұрын
    • @@SighsInternally They're called "Gauge Blocks" usually made of extremely hard steel for wear resistance (although ceramic blocks we're in favor for awhile), they are precision ground on opposing faces - with a surface and finish that is so fine that they are able to be "wrung" together and will "stick" to each other (as in the video). They have various uses in Manufacturing/Quality Assurance applications.

      @BELCAN57@BELCAN57 Жыл бұрын
  • "Have you ever experienced true level Morty?!!"

    @fredcscully@fredcscully3 жыл бұрын
  • Very interesting video, as a knifemaker its easy to achieve high level of surface roughness but flatness is a real challenge and something to keep improving on!

    @barthooghwerff1682@barthooghwerff16824 жыл бұрын
  • What the heck!! This amazing video comes from channel which only had 14K subscribers?? This channel should get millions of subscribers with this amazing explanation and quality content!!

    @user-uw1wq9rj8g@user-uw1wq9rj8g4 жыл бұрын
  • Thank you for this quick look into this very interesting field. I especially enjoyed to see the different testing devices. The lens that uses monochromatic light is fabulous. When it sits in its case, it just looks like a piece of glass, until you use it properly.

    @andrebartels1690@andrebartels1690 Жыл бұрын
  • Very good job of explaining the basics of flatness. My background in is tool and die making and design and all of what you covered was the world I lived each day. I ran surface grinders and have to maintain tolerances within .0001".

    @hootinouts@hootinouts Жыл бұрын
    • do you know what the things at 9:30 and 9:40 are called?

      @SighsInternally@SighsInternally Жыл бұрын
  • How does this channel only have 4.3K subscribers? That's insane! You should do collaboration with "It's Okay To Be Smart", he invites people to his channel just to say a few word and then links to their videos. I guarantee you that your subscriber count would rise at least 10 times.

    @davidreinhart373@davidreinhart3734 жыл бұрын
    • Ill look into that. i have no I idea what edge I’m missing to get huge. Growth has been slow and constant though and the sub support has been awesome. Thanks for the kind words!

      @NewMind@NewMind4 жыл бұрын
    • @@NewMind Your channel has the content and production quality for older channels with more subs to be willing to collab - though it can take a while to find channels looking to make a video on the same topic as you, and where the schedules work. You're on the right path, and making videos the right way.

      @chrisedwards3866@chrisedwards38664 жыл бұрын
    • I seriously wonder this as well. The quality of scientific/engineering information here is even better than Real Engineering. I think this channel's author might need to invest time into the marketing concepts of how to grow a YT channel; an advertising and marketing adventure and skill set that is very different from just making excellent science/engineering videos. Just don't stop making the videos at least. They rock.

      @jonathancrawford6919@jonathancrawford69194 жыл бұрын
    • I know right. This channel needs a million subs by this time next year.

      @BenMarvin@BenMarvin4 жыл бұрын
    • Well now he has 5.9K.

      @phillhuddleston9445@phillhuddleston94454 жыл бұрын
  • Very informative and well edited video. If ever you chose to revisit this topic, a concern when you start approaching high level of flatness is that temperature differentials throughout the part being measured can significantly skew the results making climate acclimatization an import step before measuring. I've seen toolmakers and engineers struggling with inconsistent readings for weeks only to find out that parts need to sit in the QC room for a while till they acclimate. Otherwise mounted on measuring fixtures can pull the heat out of one part of the piece while the rest is still warm causing it to warp.

    @siggyincr7447@siggyincr74474 жыл бұрын
    • I used to flat lapp seals for pumps and they were perfectly flat under the glass when they came of the machine but once they cooled a little the light bands I saw didnt make me happy anymore so yeah temp is a big deal

      @markkoot5318@markkoot53184 жыл бұрын
  • This video is a whole mood. I sometimes feel flat. Sometimes round. Or like an edge. Or a spike.

    @neatt3815@neatt381511 ай бұрын
  • Absolutely fascinating- and great info for those who may have a limited understanding of materials and manufacturing. Thanks for this!!

    @quaxenleaf@quaxenleaf2 жыл бұрын
  • Chances are I'll never use this knowledge, but its still very intriguing and I'm glad I watched it. Thanks for the info

    @mohammedobeed714@mohammedobeed7144 жыл бұрын
  • As a mechanical engineer and cmm engineer at an aerospace company is makes me so happy to watch this.

    @IVGHOSTLY@IVGHOSTLY2 жыл бұрын
  • Wow! Thank you for this, my dad was a Metrologist who spent his life making slip gauges and even taught me to lap and perform optical flatness tests

    @jeffquantrill5570@jeffquantrill5570 Жыл бұрын
    • do you know what the things at 9:30 and 9:40 are called?

      @SighsInternally@SighsInternally Жыл бұрын
  • You showed a clip of Tom Lipton from his KZhead channel oxtools. He has many great videos showing how to create flatness, the science behind it and tooling used to achieve it and how to measure flatness. Tom is a pretty awesome teacher.

    @393strokedcoupe@393strokedcoupe4 жыл бұрын
  • The flatness causing objects to bond is one of the most amazing things I have ever heard!

    @Renwoxing13@Renwoxing134 жыл бұрын
    • It's even more amazing the first time you stick a couple of Jo-blocks together.

      @currentbatches6205@currentbatches62054 жыл бұрын
    • It has to be the same material. Something this video missed, but clearly showed.

      @meoff7602@meoff76022 жыл бұрын
  • I remember watching my Dad use a straight edge, a set of feeler gauges, a 4" angle grinder (with a varying grit sanding discs) and some heavy cut & polish to shave the warped head of an old Toyota we had as a "bush basher" when we were kids... that fix outlasted plenty of other parts!

    @macca462@macca4623 жыл бұрын
    • Nice compression ratio

      @satsumagt5284@satsumagt52842 жыл бұрын
  • Wow. Exactly today, we worked with the magnetic grinder, and we grinded the surface of an steel cube. And the interesting thing is, how precise that grinding is, and even more mindblowing is, that thats not the best surface-fining method like honing, laping etc.... 😃

    @kexcz8276@kexcz82763 жыл бұрын
  • 10:25 lower left portion of the lens... Love the CCCP technology

    @dmitriyk6962@dmitriyk69624 жыл бұрын
    • СССР

      @mikihisakaribe2319@mikihisakaribe23193 жыл бұрын
    • Do you have an idea from where we can buy that lens?

      @GbpsGbps-vn3jy@GbpsGbps-vn3jy2 жыл бұрын
    • Also sitting and smiling =)

      @udafflong1619@udafflong16192 жыл бұрын
    • @@GbpsGbps-vn3jy YES! After reading your question I found your answer. But it doesn't have the CCCP logo. Here: www.edmundoptics.com/knowledge-center/application-notes/optics/optical-flats/

      @coloradostrong@coloradostrong2 жыл бұрын
  • My great grandfather used to make precision surface plates. Lots of hand-scraping.

    @ClockworksOfGL@ClockworksOfGL4 жыл бұрын
    • It is amazing what the human hand can feel as far as minute changes in thickness and surface uniformity.

      @BestLittleStudio@BestLittleStudio4 жыл бұрын
    • I really admire the look of scraped and flaked surfaces. Hadn’t had opportunity to try it myself yet, but there are many videos about the process. Cheers!

      @dipi71@dipi714 жыл бұрын
    • Jim Henline - It was many years ago when my grandfather explained the process, but I recall him saying it involved multiple plates and different colored “leads”, which would show high spots when the plates were rubbed together. My grandpa was a toolmaker himself and hand-finished a 90 degree angle just by lapping it until no light passed by when it was held up against a master square. I had it checked by a metrology calibration lab a few years back and it was accurate within 20 millionths/6” or something insane like that. The old man was really something else - he even specified the exact concrete formation for the foundation when he built his house.

      @ClockworksOfGL@ClockworksOfGL4 жыл бұрын
    • @@ClockworksOfGL You can still get Prussian blue dye which marks the high spots. The stuff he must have used was red lead, or minium. Not so healthy for you, but you can still get the powder as a paint pigment and mix your own compound for hand scraping

      @keiy.4031@keiy.40314 жыл бұрын
    • @@BestLittleStudio i doubt it ,total flatness was made with three plate method three decent flat surface correcting each other.

      @woozhi9218@woozhi92184 жыл бұрын
  • One of the flattest surfaces we know how to produce is pure molten tin. Aluminium has a similar effect, however when it is in its pure molten state it must be kept prohibitively hot to prevent oxidizations forming and ruining the flatness. It’s one of those cool properties I wish more factory games would play around with, needing to maintain a constant supply of a consistent molten metal.

    @Jaxck77@Jaxck772 жыл бұрын
    • i wonder if you could get it to harden in an place without gas that reacts to it and keep that flatness

      @hfso372@hfso3722 жыл бұрын
    • @@hfso372 You would have to cool it down really slowly, within non-reactive atmosphere. Possible but not the best way to achieve flatness

      @mirko241@mirko2412 жыл бұрын
    • actually it's as round as the Earth. And mica is flatter and solid

      @trollmcclure1884@trollmcclure1884 Жыл бұрын
    • @@hfso372 You can. It’s a fucking nightmare, which is why it’s almost never done.

      @Jaxck77@Jaxck77 Жыл бұрын
  • Wow! The optical measuring blows my mind! Cool!

    @xw591@xw5913 жыл бұрын
  • 12:36 "at these scales, definition of the flatness quickly become..." indescribable by words :D :D

    @engineer9528@engineer95284 жыл бұрын
  • you sir just earned a new subscriber, I myself work in machining, flat really in most cases means I'm within +-0.01mm :D If you go over to the optics side they measure flatness in radiuses the size of the planet :)

    @Strothy2@Strothy24 жыл бұрын
    • Strothy2 and by radiuses of the size of the planet, you mean infinitely large radiuses, cause the earth is flat, everyone know that. And before anyone takes me seriously, yes, I am joking

      @aboriani@aboriani4 жыл бұрын
    • I just imagine you going to 0.02 and chuck whatever your making across the shop.

      @bryanmartinez6600@bryanmartinez66004 жыл бұрын
  • Excellent work here. Your use of language is unusually precise. Thanks.

    @Larpy1933@Larpy19332 жыл бұрын
  • I never ever ever thought I could be sucked into a video on flatness. Some simple things are way more interesting than you realize

    @mikealangaloe1774@mikealangaloe17742 жыл бұрын
  • Pleasant, concise delivery of knowledge - thanks.

    @LitchKB@LitchKB4 жыл бұрын
  • 10:17" ancient Soviet technology! :D

    @stevenbodo965@stevenbodo9654 жыл бұрын
  • I just came from how glass is made and they explain the tin floating glass part so this is spot-on I understand perfectly

    @BigSp3nda@BigSp3nda2 жыл бұрын
  • im an industrial mechanic, and ive did some further education. this shit was really cool in school honestly. i specifially worked with molten aluminium, and there is so many exciting things about this industry. also cool using cnc to make very precise machine parts for food industry, or calculations how to cast a part from a bottom of a bmw car.

    @coooolibri@coooolibri2 жыл бұрын
  • and ensuring the work is uniform in its temperature to avoid thermal induced error.

    @routtookc8064@routtookc80644 жыл бұрын
    • @carpe diem Imagine if the top of a "flat" plate was warmer than the bottom. The top would expand, causing the plate to warp. This affects flatness.

      @soaringvulture@soaringvulture4 жыл бұрын
    • @@soaringvulture Yes, a 1 degree Celsius difference in temperature between the top and bottom of an AA grade surface plate can throw its flatness out of tolerance. Even without a thermal gradient, materials expand and contract less at their edges, so a surface plate becomes convex as the temperature rises, and concave as it drops. Calibration laboratories go to great lengths to prevent thermal errors - tightly controlled environmental temperature, forced air circulation to prevent vertical thermal gradients, limiting the presence of 70+W organic heating elements (humans) to a minimum, even minimizing lights to limit radiated heat. It's normal to fixture components and gauges, then leave them in place for hours to normalize, then to take the measurements as quickly as possible before the human presence starts to affect readings. NIST have a great document on gage block calibration, "The Gage Block Handbook" , that describes the lengths they go to in order to accurately calibrate gage blocks. Personnel wear mylar capes, cotton gloves and use insulated tongs in order to prevent human heating effects. They even worry about different surface finishes absorbing radiated heat at different rates affecting comparative measurements which they use to reduce uncertainty errors. Yes, thermal errors are very real

      @genixia@genixia4 жыл бұрын
    • @@genixia Yep. I have an inspection block level for leveling machines and it's good for 2 arcseconds, or .0001" per 10". You'll see the bubble start to move if you touch the level, breathe on it, or let a sunbeam hit it. It's a good demo to show people how even minuscule levels of heat can change your measurement. It also makes me wonder why so many shops don't bother with the expense of a temperature controlled shop so the machines can take full advantage of the thermal stability of the environment. The chiller systems can only do so much.

      @keiy.4031@keiy.40314 жыл бұрын
    • @@keiy.4031 I calibrated these

      @geraldstewart@geraldstewart2 жыл бұрын
  • I got to show this to the new guy at the machine shop. He was supossed to paint a stamping tool, painted surface ground mating surfaces and when told to remove the paint he used a hand held angle grinder...

    @tomte47@tomte474 жыл бұрын
    • Man I’m just out of HS machine shop... Sounds like maybe he didn’t really belong there in the first place lol

      @russellg1473@russellg14733 жыл бұрын
  • My shop teacher used to own a transmission shop. Valve bodies in hydraulically shifted conventional planetary automatic transmissions are among the flattest components in cars, as manufacturers tend to use no gasket between the valve body and the transmission body yet have to seal in high pressure atf to control bands and clutches. Funnily enough he purchased a broken fine grained granite tombstone which the mason had cut to .0005 of an inch, he claimed. Cost him an arm and a leg. He would secure a sheet of 1500 grit sandpaper to it and run the valve body’s mating surface over it to ensure flatness... who would have thought a tombstone would have worked?!

    @ramblerclassicman221@ramblerclassicman2213 жыл бұрын
  • Incredible video! I am an economist myself, but I love to learn about these kind of things I followed everything quite well, until the greenlight part of video came up. Then I was like - ARE YOU A WIZARD :D incredible stuff

    @Frlja@Frlja2 жыл бұрын
  • Dont you just love when thr youtube algoritem shows you somethings science instead of timewaste

    @rubikfan1@rubikfan13 жыл бұрын
  • Well i see this channel going places. Right up my ally. Earned a sub on first video

    @ryanburbridge@ryanburbridge4 жыл бұрын
  • I had a boss who owned a epoxy’s company. He had a bathroom that was perfect. It looked weird. Never noticed but imperfections make perfection

    @hung8969@hung8969 Жыл бұрын
  • My dad was a machine operator at a Nike site and manufactured parts out of "pure" silver for NASA. He left for cigarettes just after I was born, but my mom said his tolerances were 1/10th the thickness of a human hair.. that's what I kept thinking about watching this.. I mean his parts were perfect but only by his measurements and the standard she was given. better equipment and tighter tolerances would have shown that they were far from perfect.. I've often pondered this and I think this video did a good job of getting into it

    @rogerbussiii@rogerbussiii2 жыл бұрын
  • As a kid i was wondering about how the first perfectly flat object was made as in my logic that would require something else equally flat to shape or form that object and thereby creating a paradox. Then i learned that liquids are perfectly flat and also that there are many different methods to produce "flatness". And finally i learn that everything is relative and depends on reference frames and that you can not know everything about anything. There will always be uncertainty, thats the only thing we can really know for certain ;)

    @Rocksteady8519@Rocksteady85194 жыл бұрын
    • Haha, yep. Even with optical methods there will be gravitational distortion so it's impossible to actually measure it as you can't get a true reference, only better and better approximations of it. But, once you get down to those lowest levels anyway, reality itself becomes kinda lumpy and not at all a thing where straight lines and such even have much meaning :p (like, what even is a flat surface? The atoms themselves have uneven electron field densities, like their shape undulates, so there is no flatness)

      @mduckernz@mduckernz4 жыл бұрын
    • Liquids are not flat, though, they're curved along the Earth's surface. Which in turn isn't a perfect sphere. Fun fact: if the Earth was a flat disc or rectangle, spilled liquid would still not form a flat surface :)

      @VioletGiraffe@VioletGiraffe4 жыл бұрын
    • @@VioletGiraffe I get your point but i feel some kind of astounded that you had to mention the earth is curving aka round... If Earth didnt rotate and was covered 100% with water AND gravity was evenly distributed along the entire surface, then it would be quiet close to being spherical no matter how many valleys and mountains it contained. (the moon would have to go at this point also) Liquids are shaped by gravity and surface tension to my knowledge so you cant really apply a shape to it. The "fact" you mention would be nice for others if you elaborated a bit on that part. I totally get it but other people might not

      @Rocksteady8519@Rocksteady85194 жыл бұрын
    • What, were you some kind of ultra nerd as a kid? I guess I wasn't the only one pondering odd questions.

      @jaredkennedy6576@jaredkennedy65764 жыл бұрын
    • look up the 3 plate method

      @hunger993@hunger9933 жыл бұрын
  • I'm trying to figure out how to properly calculate why "flat is justice" and this has been a huge help. Thank you New Mind, very cool!

    @ocircles738@ocircles7384 жыл бұрын
    • well, flat is justice because when two flat surfaces rub together, they become stuck.

      @GameFuMaster@GameFuMaster4 жыл бұрын
  • I enjoyed polishing flats more than grinding. Second surface polishing was done with the work mated with the block by molecular cohesion as you have shown here. It was a great job but paid squat. Oh, one of my light boxes used a ruby laser.

    @babydriver8134@babydriver81342 жыл бұрын
  • as a former specialist in the field of measurement technology and cmm programming i also approve this video

    @ijuvatar@ijuvatar3 жыл бұрын
  • 10:33 lol no Russian can miss the CCCP logo on that glass.

    @PM17E5@PM17E53 жыл бұрын
    • Да, товарищ! Хороший глаз.

      @coloradostrong@coloradostrong2 жыл бұрын
  • Don't know why KZhead recommended me this and I don't know why I clicked it, but I don't regret it 😂

    @dronicx7974@dronicx79744 жыл бұрын
  • I work in a steel mill. My job is to grind skp rolls. Our tolerance on a roll 17" in diameter, 6' long is 0.001...I know all about flat lol. We also take a roughness measurement, and there is a tolerance for that as well. That would be a good video as well how smooth is something really.

    @compoundlml7156@compoundlml71562 жыл бұрын
  • Meanwhile my boy out here rubbing three plates together in turn to make the flattest thing I've ever seen.

    @Asdayasman@Asdayasman3 жыл бұрын
    • Triple lap.

      @mckenziekeith7434@mckenziekeith74342 жыл бұрын
  • If you want to try the effect of having two really flat surfaces stick together try two platters of a hard disk. They also make perfectly flat mirrors. To get an idea of how flat they are try using them to reflect the sun into a distant building, it like a laser.

    @graememudie7921@graememudie79213 жыл бұрын
  • Плоскопараллельные стеклянные пластины из СССР (USSR) со знаком качества :)

    @aftaev@aftaev4 жыл бұрын
    • Остатки древней, более развитой цивилизации.

      @a3sop@a3sop3 жыл бұрын
    • Hahahaha 😂🤣 good one

      @RyanMcIntyre@RyanMcIntyre3 жыл бұрын
    • @@a3sop Цивилизации, которая развивалась, пожирая своих детей.

      @OlderSpud@OlderSpud3 жыл бұрын
    • @@OlderSpud Детей?

      @a3sop@a3sop3 жыл бұрын
  • I was a machinist in my previous employment. Among the jobs that I do is lapping repairs of sealing surfaces of mechanical seals. Flatness is measured in light bands. 1-2 light bands is acceptable.

    @Zakaius@Zakaius Жыл бұрын
  • I once had a 3500 word essay on the difference between precision and accuracy in college. There is a huge difference.

    @billabong9215@billabong9215 Жыл бұрын
  • Very interesting information. I was surprised to find out that very flat objects will stick to each other. Very cool.

    @dustdrop@dustdrop4 жыл бұрын
    • The first time I saw it in person I was blown away. Whats even crazier is you cant just pull them apart and need to twist them off.

      @southjerseysound7340@southjerseysound73404 жыл бұрын
    • And it's not "exactly" known what causes this.

      @rabie4x4@rabie4x44 жыл бұрын
    • Air pressure causes the objects to stick or rather the lack of air pressure between the surfaces does.

      @PaulBednall@PaulBednall4 жыл бұрын
    • Could it be the Casimir effect? Microscope slides are packaged with a powder-like substance between them to keep them from bonding. Occasionally you find them stuck to each other permanently.

      @markc2643@markc26433 жыл бұрын
    • It's the Van der Waals force.

      @Fritzpuddel@Fritzpuddel2 жыл бұрын
  • As a previous mechanical nuclear inspector I really enjoyed this. Thanks.

    @brucefulper4204@brucefulper42044 жыл бұрын
  • Ringing occurs when I have a beverage on my coaster where the glass cup collects and drips water from condensation and attaches to the coaster, forming a vacuum. When I lift the cup, the coaster sticks to the bottom for a few seconds.

    @mavenfeliciano1710@mavenfeliciano17102 жыл бұрын
  • This reminds me of the saying of - When you ask someone to measure a coastline of a land mass? Sure the person can come to a certain perimeter BUT then you realize that you can continuously change the measurement system to measure the perimeter of the land mass and it can get broken down into finer and finer segments of connected measurements.

    @benmcreynolds8581@benmcreynolds8581 Жыл бұрын
  • This is the best video you will watch about Flatness on youtube, well done everything said was correct, i love that you pointed out the common misconception about inspecting flatness and parallelism, many machinist will appreciate this video, thank you.

    @misternintendoman@misternintendoman4 жыл бұрын
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