I'd very much like to see that done, maybe with a heavier and harder alloy that machines and polishes well like inco718 or the like. Having both pieces polished to a truly mirror finish and then shining lights or lasers onto the piece would also be a magnificent spectacle

@@CtrlAltRetreat Ah yes. Everyone has a 30cm Diameter scrap cutoff of Inconel laying around.

@@cayleependerass , what? You don’t?

I actually do! Hahaha

@@mynameismatt2010 The magic of KZfaq! I was actually thinking that if no one did, I'd call up some of my buddies back in the place I worked in 2008. The shop got acquired by allegheny but them and wyman gordon I know for sure are still making turbine blanks for forging out of inco718 and they always used to have about 8" end cuts of scrap off of each billet. Since we know we want a 1/6 ratio, that's actually pretty easy to buy something to work with. Even a 12" billet would only need about 2" of depth and they typically didn't use ones that big. Theoretically, the increased density and hardness should result in a much more efficient disk even with a little less diameter. If there happens to be a guy who has a nice lathe who's looking for some work near central to east Texas who's looking at this, post a comment replying to this maybe we can make something work. I'd be inclined to go through this just to have one of these around

Use glass.

Hardened glass might be okay

Put the metal plate or a glass plate on some fresh concrete. If the plate flexes just a little bit, it looses a lot of energy, so if you cast it into concrete there is no air gap underneath the plate and it is not able to flex at all.

I saw it shifting. Also I would have polished more and better, but that's what I do is make mirror finish surfaces by hand. Not machine precise. Really cool stuff though guys. More toys than I have.

When they were crouching down I was expecting things to get cheeki breeki

Such a nice sound on that machine. If this is what a midlife crisis looks like i can't wait xD

@@mojolotz I'm way past midlife crisis!

Watching lathes is quality machinist porn.

Indeed! And to avoid any loss of energy, the plate should be fully fixed to the foundation (no damping stuff in between!). Maybe put the plate on a "perfectly" level concrete area.

@@perribru Grinding the plate concave will help as well. The closer to optically perfect the better, but of course that is a complex task.

@@BixbyConsequence A hollow grind certainly seems easier to do than a perfectly level surface.

I'd try adding hundreds of playdough lumps under the plate. The idea is to minimise flexing of the plate which means if you can hear the disk rotating then it's wasting energy.

@@olsmokey The thickness of the plate could be increased to reduce the flexing - but the softness of the playdough will always be the major loss of energy - it allows the plate to move laterally and also changes thickness - both eating energy out of the system. If the plate was concreted/epoxied to the floor completely and allowed to set - I'd agree with you - but I don't think they want a metal plate concreted to the floor...

@@dav1dsm1th They could just bolt it to the floor so when they are done they are only left with 6 or so small holes that can easily be filled

this was my thought the moment I seen the playdough, why he didn't even consider it at any point this tells a first time view a lot

I'm curious. How did you machine/grind it and in what form was the original TC piece?

@@jeromeprater183 It came in the form of a solid rod. I am a machinist. I did it all on the surface grinder, first with a diamond cutoff wheel then a regular diamond wheel to true it up

@@SuperAWaC I'm thinking of having a few manufactured for me. Do you think it wobbles long enough (compared to steel) to be worth it?

@@Sgt.Hartman It depends on what you pay for it. It is mostly just for fun. The tungsten carbide will scratch everything up over time.

The bottom plate needs to be flat or else it won't spin the same

Counter top manufacturers always have piles of slabs for free. Mostly sink cutouts. Polished on one side, textured and ready to adhere on the other.

Stone wouldn't keep its flat under a steel disk and it would spray particles of sand all over the base.. especially granite, it's very brittle and the edge the disk would chew it up like a saltine

@@Faesharlyn I thought of this also and it would depend on the granite, radius and hardness of the steel. Black granite would be my go-to because of it's tight grain structure and would probably fare well with the radii in the video. But sure, a hardened steel disc with a sharp edge would score it like a glass cutter.

@@ross9580 definitely, a hard corner would do more damage than a rounded one but spin longer I was thinking about how different stones would sound, gritty or smooth depending on the hardness i would think, but the harder the more brittle.. what kind of force hits the plate when the disk lands flat? If on a piece of obsidian i think it would shatter like the obsidian ball under the press, just *splash*.. or an obsidian disk, spinning and whistling like a singing bowl? Shattering on landing? Wouldnit even hold together or chip at the edges? Physics fun!

And a discussion made out of Osmium ( YIKE$)

I tried it once and lost all circulation to my legs. Pfftt...weak American legs..!

Careful now. The fragile majority will take offense, without even knowing who, what, where, why, when, and or how.

Get the hard bass going!

If they had AKs and wind breaker jackets it would be complete

I was looking for that comment

I don't think you would see anything. All energy this system is the potential energy of the steel plate. And even just a part of that actually gets converted into heat. Thats almost nothing compared to the heat capacity of that ammount of steel. The temperature probably changes about 1/100 - 1/1000 of a °C

@@sushi3377 yeah you’re probably right, the thermal mass of the disc is far to big to register much of a change. I was just thinking of the loss of energy being converted to heat via friction but didn’t consider that. Good point!

Yeah probably at least 12 heat

I'm assuming something like: E=mgh+0.5mv^2+0.5Iw^2. With m=mass of disk, g=gravitational constant, h=vertical displacement of the centre of mass of the disk from initial position to final position, v=Initial velocity of the centre of mass of the disk imparted when spun, I=rotational inertia, w=rotational velocity when spun. Not too sure how that'll interpolate together but something like that, ignoring losses.

@Pandacat 666 sounds like my kind of party.

The rotational speed (on the floor plate) is at its greatest at the moment the disc hits it, and it gradually slows down from there; yes, I know that's obvious, but it needs to be said to address posts I've seen elsewhere, stating that the disc is spinning fast, like a top, AND GOES FASTER AND FASTER. For a 3" diameter disc (which, not weighing much, can be spun much more quickly than the monster disc shown in the video), a good spin for a long run for me starts at about 2 full rotations per second. So -- unless one is incredibly strong -- the 60 lb. monster disc must have a _much_ lower starting rotational speed than my 1 lb. disc.

And Lauri said it was very noisy, thats additional proof, but the biggest proof is the short duration, very severe energy loss.

@@pflaffik good point about the noise. Great example of something that seems obvious once you know about it but isn’t actually so obvious until you pointed out that the noise is a form of energy emission.

That and backing the plate with some tacked on studs then pouring say a foot of concrete would stiffen up the surface so it isn’t bleeding out so much energy as noise.

Yeah get them nitrocarburated

Bit difficult to harden literal “mystery steel” and if I recall correctly from the surface hardening video, the cost involved as well as the amount of time required with even the most superficial surface hardening is just completely unrealistic on a project like this one.

@@Jay22222 Nitrocarburation is relatively cheap, it happens on quite a huge scale in the Nordic countries. Minimum charge at a place I used to deal with was only around €80.

@@jcims A bigger thicker plate would be simpler.

He said something like conwaved

A good way to remember is if the center goes in, like a "cave", it is concave. The other is convex, if the center comes out.

@@mtnvortex Thanks, really useful tip for a non-native speaker =)

@@mursmumies123 No problem. I had a teacher tell me that when I was very young. It was something I used myself to remember.

@@mtnvortex same. had a good physics teacher

Unless you have Play-Doh hands.

@@sdspivey Yes, if you have friends who are Play-Doh people then you must supervise them when performing this experiment! 😂

Or unless your coin weighs like 50+ pounds

Unless you do it in front of my old study hall teacher for 20 minutes or so. Then it is not safe.

Beyond The Comments

do you got a video? :)

Attach with bolts from edges to a heavy steel plate. Should be fine then.

Set it in grout perhaps?

*playdoo lol

I agree. They need to put that plate on the granite surface plate they have in the shop. I bet the play-doh robbed a good bit of energy from that system.

U must be Canadian eh? lol

@@mgtowrules1649 Nope Dutch ;)

I don't think It's spinning fast. I think the rotation even slows down over the process, because the rotation momentum is tranformed to the up and down movement!

@@GuaranaMontana Initially while it's mostly vertical it's rotating on a very small axis and going fast, but as it lowers the area that it's rotating on expands and the spinning slows down, a visual representation would highlight this.

@@JosephParker_Nottheboxer Slowmotion footage from above would solve the miricle ;)

Include a clockface in the background that has a second hand. So there is a known frame of reference speed.

Men are never to old to get exited about new toys. As you grow older, the things you regret the most are the ones you never did when you had the chance.

I hate to say this but ... you are right! 😲

entropy at its finest

No no, you have a point

He's got a point

420 to ya man 👍

Those are long overdue.

It's a funny meme shirt from cheap market. It says in Finnish that my well being is at knife's edge :D It's a bit of inside joke since we used to do way too much work and sometimes it felt like it's taking its toll from you.

I was wondering that myself. It's kind of hard to not notice the shirt.

No. In theory, the speed will always go towards infinity but due to the imperfections of the reality, the disc will never reach that speed. Those small imperfections are the only thing that effects the final speed. Of course, larger the disc, smaller those imperfections are in relation to it's size, so that causes larger discs to reach higher speed usually.

Matt Parker has several great videos about Euler discs.

that's kinda what I was thinking, but I figured removing mass from the centre would be the bigger factor rather than the concavity. So I suggested using a steel hoop made from round bar... you might get more rotations out of it that way, but in any case, once it lays flat it's game over.

Intresting and I would say to dangerous. But considering the stone comp... I think it's a great idea

@@peterzingler6221 yea that atlas stone thing looks super dangerous. Figure this would fit the bill also. Have you seen the video where the dudes spine just gave out while lifting the stone? And then it fell on him too, jeezus.

@@peterzingler6221 its too dangerous. Atlas stone might crush something but its difficult because of the diameter. It tends to push the legs away from the stone when its dropped. This can lop a toe or fingertip off with ease

Depends on what you mean by efficiency. If you shout loud enough to stop further questions it might be more efficient ;-)

@@benbaselet2026 If you do not allow someone to speak, you will give cause for violence. And violence is definately wasteful, as you have to break something that can not be unbroken. Perhaps mended or healed over time, but not unbroken.

That's actually really good idea! I will check out would it be too expensive build but I think I could pull it off

Yep probably shit load of steel beams and one day of welding :D I will do some calculations on cad to solve would it be too difficult

@@Beyondthepress I mean you could also press test a tensegrity table :D

@@peterzingler6221 I think I have to do both. I will laser cut smaller one out of sheet metal and then weld large one out of steel beams

'if the track is clean' ;)

What would you do if you could afford anything? First...think about it. A large fraction of desire is being beyond reach.

A mid life crisis is when you buy the toy - even though you can't really afford it - because you want to fool yourself that you're still young.