Lapping my Granite Surface Plate to AA Grade


229tn visningar39

    This video shares the processes we took to both measure my granite plate using differential levels, and lapping it into a AA grade spec based on ASME specifications. I am extremely happy with the results and it will exceed my needs! Big thanks to my buddy Lance who helped me with this project.
    Paypal Channel Donation:
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    My second SEprom channel that covers our fun explorations and traveling.
    Abom Adventures

    Publicerades den Månad sedan


    1. tolga1cool

      Next time on the show: Lapping my new kitchen countertop

    2. Glenn Pady

      Does the expert have a SEprom channel?

    3. omzig18

      What is the purpose of something like this like why does it need to be so flat

      1. unInnocentBystander

        In fine machining, you not only want to be precise with parts--you want to be consistent along the length of whatever your fabricating (that's one example use). Let's say you want to make a metal cube. You machine one, set it on a table, put a level over it and go "hey sweet it's perfectly level, it's a perfect cube". But then you notice you can slide a post-it note under some areas, or shine a flashlight on one side of the cube and see a bit of light peaking through the bottom of the other side. This means your cube may be (to the naked eye) square, level, and perfect--but in actually there's variations along that surface you're examining. So in machining, flatness is an important quality of making certain parts. Try taking two clean pieces of plate glass and rubbing them against eachother--you'll notice it's a challenge to get them to budge. That's because both of those two surfaces are making contact perfectly. Pretty much a vacuum seal. Obviously this is a useful quality, yet another aspect to pay attention to when talking about "tolerances". So, a surface plate like the one in this video is used to reference the "flatness" of a part you're making. You'll see many of these plates made out of Granite because its a hard material and is pretty "flat" naturally. Lapping--in the context of this video, is abrasively "reflattening" the surface after years of use and abuse as good maintanence. I hope this reply helps.

    4. Ale Malvina

      Is there a reason is made of granite? This old Tony channel mentioned a flat surface for measuring made in granite. My guess its that granite is thermally stable unlike metals

      1. Ale Malvina

        @unInnocentBystander Ok thanks.

      2. unInnocentBystander

        Not only that (though that is a good quality too), but granite is harder than metal (pretty much)--so you won't need to worry about scratching your nice flat surface as you place (and sometimes slide) your machined parts across it. And the reason I say "pretty much" is because you can obviously do some damage to a flat granite surface if your part is covered in say, diamond dust.

    5. Chad Johnson

      I for one appreciate the background and education required to learn a topic thoroughly. I only just completed my Master's in the health care field, and do not have near the level of education Lance has achieved. I am also a hobby machinist and am learning all the time. Trust me when I say becoming a doctor of veterinary medicine is no small feat, and requires a great deal of work, discipline, researching your topic, and proving your statements. For myself, I appreciate Lance sharing his knowledge of metrology. I mean no offense to anyone, but please give the man the benefit of the doubt. His credentials speak volumes. Keep up the good work gentlemen!

    6. No One Of Consequence

    7. The Off Cycle

      I see some RCBS dies... ya this guy is about precision.

    8. lethis196

      Dumb question but what's the granite slab for and why is it so important to be that flat?

      1. Jon Watte

        If you're OK with your things being wobbly and not fitting together, you don't need any flat reference! But things that slide and mate precisely (without gaps) need to be very flat and very square. If you start making things yourself and try to achieve precision, you will quickly realize this.

      2. Fettgummie

        its a surface plate and if you want to fabricate anything you have to have one surface that you know to base everthing else of and the first thing used was a surface plate there are some realy good videos on youtube about the origin of prezision that explains it realy understandeble by a youtube channel called Machine Thinking

    9. Gregor Teplý

      Experience true level!

    10. William T. Musil

      Hiya Adam

    11. Was-a-Gus

      You get him for a 2nd day! Sheesh. My 17025 guys only do one day. Probably good enough for what we're doing. Couldn't imagine what this guy charges. Nice job. Now don't ever use it again. Haha.

    12. Jason Thomas

      ..but that ride along!

    13. Michel Auron

      Them's some pretty neat levels, and a very good result. I've got my diy plate down to under 1/100 mm overall. I wrote my own software (based on a friend's excel spreadsheet) to do it. Doesn't use moody - after all, moody was working when a "computer" was bunch of people doing math by hand, and results had to be achievable within a reasonable timeframe, say a day or so - instead it does a bunch of matrix math and uses a rectilinear grid, so gets overall *and* local flatness (within, obviously, the size of grid, which is somewhat defined by the length of your level). To go any lower on my plate, which I don't actually need or particularly intend to do, I'd need to get some new measuring equipment, as I'm already deep into the realm of margins of error. I'm using a 200mm long 0.05mm/m spirit level, and running it on a 3-point carriage to get 60mm between readings (my last video was still "roughing" and using a 9cm grid). My last mapping involved taking 5 readings at each station, throwing away the min / max outliers, and averaging the rest. Took 6 hours to do, for a 1m x 20cm plate. Aaaaaanyhoo, the software is up on my github, it's simply a local web page with a bunch of javascript that does the calcs, if you or your buddy with the levels wanted to do anything with it, feel free to do so. BSD License,

    14. Ed Flanders

      A great video would be taking a worn surface plate to AA demonstrating the ABC wear method.

    15. Eric’s Home brewing

      Great video guys thanks so much.

    16. Ane Adams 💜👌°°° 🔞🅿️🆁🅸🆅🅰️🆃🅴🅽🆄🅳🅴🔞°° 👌 🤩 今後は気をライブ配信の再編ありがとうです!この日のライブ配信は、かならりやばかったですね!1万人を超える人が見ていたもん(笑)やっぱり人参最高!まさかのカメラ切り忘れでやら1かしたのもドキドキでした! . 在整個人類歷史上,強者,富人和具有狡猾特質的人捕食部落,氏族,城鎮,城市和鄉村中的弱者,無`'守和貧窮成%員。然而,人類的生存意願迫使那些被拒絕,被剝奪或摧毀的基本需求的人們找到了一種生活方式,並繼續將其DNA融入不斷發展的人類社會。 說到食物,不要以為那些被拒絕的人只吃垃圾。相反,他們學會了在被忽視的肉類和蔬菜中尋找營養。他們學會了清潔,切塊,調味和慢燉慢燉的野菜和肉類,在食品市場上被忽略的部分家用蔬菜和肉類,並且學會了使用芳香的木煙 山核桃和豆科灌木 😍

    17. tim smith

      Ammonia I have read some where is good. I clean my plate with it. Yes it smells. I'm no source of info. But most glass cleaners have ammonia. ***It's been said*** "not by me" that ammonia will strip all the oil out of metal. Then a drop of water can be observed to soak in quickly. As far as officially certified remember that. "FDA Allows Bugs In Your Food: Food Must Reach ‘Defect Action Levels’ To Be Labeled Unsafe" I'm no expert just saying.

      1. Marcos Mota

        We'd have to throw away 90% of our produce and meat, and one grape would cost a $.50.

    18. Josh Nabours

      You can become an expert on a topic in a year as a hobby. To be a world leading expert it takes longer though. I don't know why people were fussin. You can tell an expert by their demeanor and knowledge as long as you have a little basic knowledge yourself. It is not like experts are infallible superbeings of genius intellect that don't make mistakes at times. Professionals and experts make mistakes too. They are people with flaws just like us.

    19. hrosemd

      "Reality is poison!"

    20. Gacheru Mburu

      Thanks for the info..👍

    21. hrosemd

      I wish I understood why this is so important.

      1. Jim's videos

        A straight-edge for drawing things is valuable because it is straight. This is essentially a 3D straight-edge. Good?

    22. Jairo Andres Vargas

      I am here watching this video down one of my many machining rabbit holes and I'm hearing Larry's explanation at the beginning. I get this weird feeling that I have met him somewhere, like he sounds oddly familiar. As the video goes on I can't shake the feeling so I check out his website and remember he mentioned he was a vet. Suddenly it all clicked together!! He was my very first dogs vet when I was a student in university!! He was such a great vet and so willing to help and really understand and connect with his patients that he has been my benchmark for all my future vets. Very hard shoes to fill but I'm glad to see him again and not surprised he is this knowledgeable about his hobbies as well. What a ride!!

    23. Rich Staples`

      what ts the point of all of this work?

      1. Rémi Mailhot

        To have the flattest surface plate for whatever you may need it for. It's not a countertop or a workbench, it's part of your toolkit used to make your precise measurements upon. You can see behind him there is a big table, they mention it is a granite surface plate and he put a big wood protective cover on top of it to protect it so he can use it as a tabletop.

      2. Paweł Gołębiowski

        To have as good flatness standard as you can make it. Never gonna be perfect, but chasing perfection is what this is all about.

      3. Dingle Flop


    24. HULKGQ Nissan Patrol

      How true is the work bench. Did, never mind it's on cheap home-made bench with steel wheel's on a concrete floor! 😂🤣😂🤣 Better keep trying.

      1. Paul Stanley

        @Pieter Skuse yep, flatness is not related to inclination.

      2. Pieter Skuse

        Are you saying that its not flat because its on a steel trolley? The granite on top can still be very flat and used as a reference surface irrespective of what its mounted on.

    25. James Taylor

      “We don’t want to bore them to death” I think he underestimated your viewers!

    26. Austin Moody

      Don't mean to be a smartass, but patreon is not spelled with an I.

    27. Glen Smith

      I know there is a cost associated with getting a plate certified, but I'd love to see what a certified certifyer would certify this plate at.

    28. AIO inc.

      True Level

    29. Warhawk76

      Sitting here wondering why the hell I am watching this... yet I still watch the whole thing

    30. motherhorsefucker

      As a certified Fischer Price machinist, think about the word "machinist" like the word "engineer"

    31. Dominic Del Principe

      My god metrology is interesting

      1. Paul Stanley

        @Dominic Del Principe :)

      2. Dominic Del Principe

        @Paul Stanley Ha! Yeap... uh, weather

      3. Paul Stanley

        Is that like the weather n stuff? ;-)

    32. Tom Kavanaugh

      What are granite plates for?

      1. Dominic Del Principe

        @Scott Schradle Yeah, I love that bit too... "... lambs to the cosmic slaughter! *Aaaggghh* !!"

      2. Scott Schradle

        @Dominic Del Principe LOL... I was waiting for someone to bring up Rick and Morty.. One of my favorite Rick moments!

      3. TheChzoronzon

        @Dominic Del Principe Too slow, I clean mine with a chisel driven by a rotary hammer

      4. Dominic Del Principe

        @cucking funt Haha! Make sure to use a Brillo pad or some other steel wool to clean it as well. Pay extra attention to the spots you sharpened your axe on ... Elbow grease recommended

      5. cucking funt

        Sharpening knives and axes and stuff. Just take the wooden cover off, put a bit of oil on and go to work.... Make sure you clean it up after or your dad will be pretty cross.

    33. Travis

      dam he works slow lol :p

    34. Justin Brown

      What is this for?

      1. Justin Brown

        @Paul Stanley I actually watched further into the SEprom tunnel. Didn't know anything about this; pretty cool stuff.

      2. Paul Stanley

        For an absolutely flat reference surface.

      3. Justin Brown

        Is this for dnd?

    35. Rv4 Guy

      What is the make and model of the electronic levels?

    36. Peter XYZ

      The problem is... people with little experience nor knowledge, Dunning Kruger effect. Anyone can hand lap to extremely high consistency just by using 3 surfaces, given enough time & good technique

    37. Keith Monarch

      I can appreciate your background. I had person who trained me to flake and scrapping ways. I'll be honest, this process is not for everyone...... Even a Lathe operator, would be challenged. It's for machine builders...

    38. T. A.

      Veterinarian = Trained scientist. If you can pass organic chemistry you can work out how to lap a surface plate.

      1. James Marks

        If you can throw a wrench, you can throw a ball.

    39. sunkid86

      There are several thing I can say about this: 1. I’ve learned today something new. 2. I now understand the Rick&Morty part about flatness. 3. I’ve just watched two middle aged men scrape a stone for almost an hour. An most surprisingly I didn’t mind it. 4. Girl: I bet he is cheating on me. While him: 5. I love craftsmen doing their thing taking pride in it.

    40. Andy J Can’t

      Dish soap, without all the hand softener bullshit, is my favorite cleaning agent. Purple degreaser is my second favorite for tough jobs. There’s a cleaner for all situations.

    41. Frans de Haan

      In all the movies about service plates. I never hear someone about the temperature inside the room. Is the temperature in the room climate controlled?

      1. Dingle Flop

        He talks about this being the "AC room" at some point- So maybe, but probably not to a particular degree of precision.

    42. YTE l Yare too Eazy

      I don't know about granite, but all cleaners like windex leave a layer on glass. That's why professional window cleaners use sunlight, or palmolive.

    43. Ronin

      I'm a stone mason who who makes kitchens out of granite, i got really excited when I saw granite

    44. Candice Jay !💜👌°°° 🔞🅿️🆁🅸🆅🅰️🆃🅴🅽🆄🅳🅴🔞°°💋👌 今後は気をライブ配信の再編ありがとうです!この日のライブ配信は、かならりやばかったですね!1万人を超える人が見ていたもん(笑)やっぱり人参最高!まさかのカメラ切り忘れでやら1かしたのもドキドキでした. . 在整個人類歷史上,強者,富人和具有狡猾特質的人捕食部落,氏族,城鎮,城市和鄉村中的弱者,無`'守和貧窮成%員。然而,人類的生存意願迫使那些被拒絕,被剝奪或摧毀的基本需求的人們找到了一種生活方式,並繼續將其DNA融入不斷發展的人類社會。 說到食物,不要以為那些被拒絕的人只吃垃圾。相反,他們學會了在被忽視的肉類和蔬菜中尋找營養。他們學會了清潔,切塊,調味和慢燉慢燉的野菜和肉類,在食品市場上被忽略的部分家用蔬菜和肉類,並且學會了使用芳香的木煙 山核桃和豆科灌木 ❤️

    45. Stryker Enterprises LLC

      See those handles on the top of the heads? They're there for a reason... so you don't induce heat into the heads or the surface plate you're trying to measure accurately. Tools are only as good as the person using them.

      1. Glenn Pady

        @Stryker Enterprises LLC in person, you won't act this way and you know it. Normal internet anonymity stuff.

      2. Glenn Pady

        @Stryker Enterprises LLC and you are watching, why?

      3. Stryker Enterprises LLC

        @Glenn Pady Who forced you to read anything? Nobody, turd. You see things through your perspective - win or lose, while failing to comprehend anything outside of your little bubble as there was no "win" or lose. The video was a poor attempt to educate the general public on lapping and measuring a surface plate. Neither was achieved. You may want to view Robin Rezetti's channel on You Tube where he measures correctly and also laps correctly. This video was nothing more than half-baked entertainment to the knowledgable...

      4. Glenn Pady

        @Stryker Enterprises LLC you are dismissed, Boy Scout.

      5. Glenn Pady

        Turd, it makes you feel some kind of special to go on SEprom and be able to tell people something. You get a "win" and a pass to look down on others. (I really doubt that you are all that. People that have to use such tactics are compensating for something)

    46. Kesjár Andor

      Very interesting, the process was mesmorising to watch. What is a granite plate used for that it needs to be this flat?

      1. mike s

        @Eldritch thanks for a very good explanation

      2. Eldritch

        To be the absolute reference for flatness, straightness, and parallel-ness in a machine shop, so you have something you're absolutely sure is flat to compare your parts to and make your measurements relative to.

      3. steven hintz

        It is used for measuring and inspecting parts.

    47. Parker Bartnicki

      A little long for someone that has no idea what’s happening, but a I throughly enjoyed it!!

    48. Microdoser

      I have to wonder how thick the pencil marks are compared to the imperfections on the plate.

      1. Big Picture Thinking

        Not sure but ox tool did a video on the thickness of a sharpie mark a while back.

    49. Chanchanchan

      Since I'm a complete ignoramus, i wonder... What is the use of such flatness?

      1. nick 450

        @Chanchanchan you can do a lot with a surface plate, flatness, parallel, angels. really anything to your heart's contents with some fixturing. but it will all be off if there is a dip in the stone.

      2. Rv4 Guy

        You would use it to blue up a part to be precision scraped, or you would blue up a straight edge to blue up machine ways for precision scraping. To scrape machine ways flat you need a reference surface to compare to.

      3. Phillip Mitchell

      4. Limosical

        @Chanchanchan flatness

      5. Chanchanchan

        @nick 450 measurements of?

    50. Spectt

      I want to collect old "out of calibration" surface plates and use them as "pavers" and make a new patio.. lol

    51. Gunhaver

      my inner engineer wants to put an "out of cal" sticker on the side, even though we all know its not out of cal lol

    52. Junk Name

      Look, it's simple, get one certified and there won't be any question about it and shut all the doubters up..

    53. xl

      What is the end goal of owning a granite surface plate that is less than μm from a plane ?

      1. Gunhaver

        sometimes you need a super flat reference. usually its so to transfer a flat surface on to something else, and you can only be as flat or less flat than your reference

    54. BlessedSelf

      WTH, Lance, get certification, do this commercially, and kick some serious, pompous asses, rather than getting kicked yourself!

    55. whaleh8er

      This is really cool... but what is it for?!?

    56. Jeffrey Durham

      Thanks Lance for bringing up the way a low could be mistaken!

      1. Jeffrey Durham


    57. Jay Sims

      Awesome. I wondered how you could get those granite plates that flat. Now I know.

    58. Duncan Love

      Impressive work! How much does the diamond grade that you use influence the quality of the lapping?

    59. Chaz Lupsha

      I don't know how i'm going to explain to my girlfriend tomorrow that a relaxing one am activity is watching a one hour video of two men leveling out a granite plate and how important an object like that is to modern civilization

    60. TheSoloAsylum

      The human mind can not comprehend true flat and level. I saw this on Rick and Morty.

    61. T. P.

      Is the granite plate below sittingon 3 points?

    62. William Garrison

      Whats the point of it being super flat whats it used for im srry if I missed it in the video

      1. Chaz Lupsha

        precise machining down to the measurements they specified in the video.

    63. GIT-FO

      My first job out of high school was in a machine job shop. I just did the gopher stuff: deburring parts etc. I ran a Bridgeport milling machine there eventually (including the set up for a simple job) and that was the sh*t. I messed up and never pursued that as a career.

    64. u rothe

      I once needed to visit a measurement room (2 by 3 meter table).--- do not lean, to not touch, do not breathe, if possible stop produce heat, juist STOP do anything

      1. Gunhaver

        i'm the guy that reminds everyone to not drop the references... mostly because there is always that one new guy that i know will drop the references. generally i try to keep that guy out of my lab lol

    65. Wesley223332

      Up until a thousandth or so, it's fairly constant, once you get to fractions of a thousandth you start to have problems with temperature, dust, hair, gravity, breathing, witchcraft, bad vibes, or even thinking too rough . Anything can throw it off when you're in the millionth of an inch range.

      1. 1320crusier

        @Rv4 Guy that cant be a feasible tool in 'real world' without almost lab like conditions..

      2. Rv4 Guy

        At the king scraping class we were on the 2nd floor of the building standing on a reinforced concrete floor. If we all stood on the opposite side of the surface plate the reading of a precision level changed

      3. 1320crusier

        Dont forget raining on the exact opposite side of the earth and tectonic activity.

    66. Vinnie Cocco

      Great job guys this was very interesting.

    67. Luka Pogorelz

      Could you explain to a layman what the roller's function is? Thanks!

      1. Luka Pogorelz

        @Wesley223332 Oh so that's what "charging the diamond" means. Thanks!

      2. Wesley223332

        I'm not familiar with the process, but I believe it embeds the diamond powder into the surface of the plate to turn it into a microscopic sandpaper.

    68. SuperPhexx

      "So, what are your hobby?" "Flat"

    69. Qualia Control

      Thanks for doing this Adam and Lance, I'm amazed at how much I learned from these 2 vids

    70. Qualia Control

      Frankly I was impressed when you said you're a veterinarian

    71. bluecraney

      Purple power is a degreaser that is excepted to not leave a residue

    72. Leo Arc

      Is this how snooker tables are treated?

    73. confuseatronica

      yeah have fun when a week later the moon is 90 degrees around the earth and the tides warp your surface plate :P

    74. Jason Spenny

      The creation of a truly flat surface was one of the key enablers of the industrial revolution. :-) This is awesome to watch.

    75. Unbias

      I came in without a clue what this is used for, and never once did I question that it _had_ to be done. It must be flat. :)

    76. Kay Bakkali

      This reminds of the episode of Rick and Morty when Rick shows Morty "The experience of True Level"

    77. Jon Doe

      This was EXTREMELY educational! Adam, thanks so much for recording and posting this video for us, and thank you Lance for showing us how these plates are "flattened" and what the gradings means. Great job guys! Now I have some accurate info when I purchase my first plate.

    78. A HILL

      Just curious but when you mark on the granite with pencil and your dealing with millionths cancer that give a wierd reading. Wondering how sensitive, but maybe I missed it.

    79. Todd Hoover

      I see the 8 fold path ... I have absolutely no need for anything to be so close in measurements. If it is within an inch, we weld it. Thank you Abom, I always like learning about things that I will probably never use... but knowledge is power.

    80. First Name

      You and Lance should do a regular show. Top notch.

    81. AIon

      Thank you for documenting this process here🙂. Would also be useful to make a video on the science used behind thouse measuring devices. Knowing how to use some device mechanically is not as good as being capable of deducing its limitations or possible alternatives - which can be infered from knowing the underlining working principle. Also such principle once learned can potentially be applied to an entirely different field. Then is also just cool to know this i think.

    82. Carl Sartor

      Is the steel plate just a lap or is it itself a surface plate?

      1. Clifford Arrow

        cast iron lapping plate

    83. Mike beats tsb

      What's this for? What does it do? What do you do with it?

    84. missmymountain

      I wonder where the Starrett pink granite is quarried? I worked as a driller for a civil engineering company that primarily designed foundations for bridges. We cored and tested a lot of rock, and plenty of granite. There really is something special about pink granite. We cored pink granite in Columbia, South Carolina that tested up near 33ksi compressive strength. That's some really hard stuff.

      1. Hugh MacDonald

        I want to say Minnesota. Somewhere in the upper midwest I think.

    85. rkalle66

      How stable is the floor? You're walking around the table while taking measurements.

      1. Unbias

        @Thomas Schulz I think it would matter if one foot of the table constantly dipped under the weight of the lapping device. He said there is some flex under loading. (I have no clue though.)

      2. rkalle66

        @Thomas Schulz ok, relative measures will do. I had some experience with measuring the surface of a telescope mirror. With the measuring device on one stand and the mirror on a second stand I was seeing my heartbeat in the picture (interferogram) transfered via floor vibration into the system. Quarter wavelength precision is going gown into nanometers.

      3. Thomas Schulz

        I don't know that it matters since the device is measuring relative to the stationary sensor on the table. Otherwise there'd be no productive way to produce an accurate measurement as there'd be too many variables in play that couldn't be controlled for. Could you imagine the nightmare it would be to have to take things like the stability of the ground under the object being measured, the local instantaneous gravity, the local air pressure, local temp, etc. basically anything that could even minutely effect the physical properties of the item being measured.

    86. John Driggers

      Adam, just wanted to thank you for giving Lance a couple of minutes to highlight his investment in time and energy in learning and applying the science of flatness.

    87. polloloci21

      I remember the first time seeing one or these stones. I was at an air aircraft manufacturing facility and it was a massive stone table- probably 3 ft thick and 6-8ft long.

    88. Jim Lahey

      I unsubbed due to the excessive ads 6 months ago.. thought I would check it out again..

    89. 63jeepj20

      As someone who has no formal education in machining the little bit ive done working for my dad rebuilding cylinder heads it really isnt that difficult to get things to an exact specification with s little knowledge and the right tools. I was resurfacing heads to a more precise specification than the majority of manufacturers. You have to remove several thousandths from a gm cylinder head to clean up the tool marks made by the manufacturer. Keep up the good work and anybody who questions your abilities likely has limited knowledge.

    90. SlickSquared

      Nice work! Interesting that you are hitting 40 millionths which just happens to be 1 micron! Is a non American AA grade a 1 micron flat? ;^)

    91. RickBaconsAdventures

      Lance is a really cool guy. Lots of qualities to aspire to. So much patience and the right attitude to learn!

    92. Stephen Brown

      It's very interesting to see a tool that gets more precise with repeated use! I wouldn't have guessed that a lap would do that!

    93. Syrusoo

      How do you choose a granite slab to make a surface plate?

    94. Kaluqwe Monsoon

      This is the real life version of Rick’s “True Level”

      1. Mason Borden

        Ive stood on a stone that came in at AA grade flat, within .0000148° of perfect level. It actually feels like it factory resets your entire equalibrium. Its at a lab in Switzerland

      2. 4Lo

        Glad I'm not the only one to think of that.

      3. erikig

        😄 This was the first thing I thought of too

    95. Taskarnin

      Having worked in the metrology industry for about two years it always amazes me (but is no surprise) that the most accurate tool we have is a craftsman’s hands and knowledge. The first straightedge had to have come from someone’s hands. All the technology we enjoy today sits on top of this knowledge which terrifyingly few people understand.

    96. MasterCommandCEO

      I was just wondering about how to do this a few days ago only to find this video uploaded a week before. That's awesome, very cool video.

    97. kelly Borgman

      I spent several years as a machinist. I got to work with granite plates and guages a little bit. I got to "wring" 2 gauge blocks together once. It's fascinating.

    98. Shayne Lafferty

      "let me show you what true level really is Morty..."

      1. Willy Nebula

        I was looking for this comment 😆

    99. Mike McNamara

      Wow! How riveting!

    100. deLulz

      -I am graduate in something really different -I have ~1 year of experience -I am better than anyone in this field What is Dunning-Kruger effect?

      1. Tracy Lemme

        The Dunning Kruger effect must have a prime example in you.

      2. Unbias

        What he actually said was that he worked in ISO and at a repeatability and level he invited external testing for. "My experience is still limited, and mostly in pink granite."

      3. RJ T

        If that is what you read into it you have some serious inferiority issues.

      4. francis Rampen

        Frankly I appreciate that Lance wants to generously share his knowledge and expertise. Certification labs don't lap things into flatness - they just tell you how flat they are. If you follow the written procedure you should equally be able to determine its flatness repeatably. As he explained he understands that he can't issue a cert that an ISO registered facility would need but that is not the point - he and Abom only care that it is flat for their purposes. Thank you Lance and Abom.

      5. TurboVisBits

        that is not at all what he was saying.