Yo, Dr Nozman here I found the most satisfying object in the world Look! And, it’s funny ’cause two weeks ago or so I uploaded a video about a pretty satisfying substance too kinetic sand But here for someone like me who often doesn’t know what to do with my hands it is the perfect object to help me. Actually, it’s called a hand spinner and it is useless, like really Except and that’s pretty cool to focus, concentrate or even relax So actually it’s not that useless At school I was from the team ‘I spin my pen without stopping’ like this It was either this, either this kind of thing I don’t know. And I always and even now need to occupy my hands to do something. And this thing allows perfectly to fix this problem which isn’t really one, let’s be honest, to add the satisfying side of the object. So I don’t know why but it’s super pleasant to spin it A small blow and it’s gone for 30 seconds of rotation noiseless, without any vibrations It’s crazy so I don’t even talk about the really cool stroboscopic effect which make us belive that the rotation direction inverts itself just like car wheels so, how does it works ? really nothing too magical but it’s really interesting The object is made of plastic with a little surprising shape et we see that there are 3 ball bearings inserted in holes So first important thing in the object conception 3 identical weights distributed at some specific distances really specific so that we have a good balance because we see it directly If I remove a bearing and that I make it spin, there is an overpoise. My arm moves The object is trained by its own imbalance. With the 3 no problem. That’s by the way why we can do this. Then another ball bearing in the middle It’s interesting the ball bearing at the functionning level Small mecanic part all of this ! In a ball bearing there is what we call two braces Here we go on macro mode to observe all this Brace that we see very well here and here probably made of steel by the way Between those braces are placed the famous balls that are themselves stuck In what we call a cage There is really a lot of different ball bearings types And here at least we have a “deepthroat” ball bearing… Sorry I didn’t create the names Excellent The two braces aren’t connected So they can turn with an indenpendant way just like this And if we mix macro mode + a little bit of good slow motion… Here there is what we call a punctual contact And this contact notion that means that there is a contact between two solids in one point Here the ball and the brace…well it is super important The punctual contact that we find at the level of every balls Prevents the parasites movements, the shaking and it limits the frictions There is actually a bit of resistance in front of the bearing And so with a bit of lubricant it can spin really fast And mostly for a loooong time It’s pretty crazy, it’s physic and mechanic So I said it can spin for a long time Yeah it’s long I guess And again there are some that can stay like 5 to 6 minutes I’m a bit curious so I tried printing one in 3D The hand spinner’s structure in any case I’m not gonna try to print ball bearings, don’t be crazy I found the model on the internet The model is really cool and let’s go for 35 printing minutes Small time-lapse like before Here it is beautiful, I just need to remove it from the support It spins pretty good like this it’s funny I need four ball bearings that I will insert in every hole and let’s test this Super, it’s excelent it works perfectly even if it’s printed in 3D it’s cool You know the score, 3D printing on the channel means….? I make a giveaway of it like usual So if you want to participate to this giveaway to win this hand spinner First of all, like this video It makes me feel happy 🙂 You can share it on social networks et mostly, tell me that you are participating in the comments from the Facebook post in this video So on my facebook page, it’s useless to participate on Youtube comments, watch out! It’s on Facebook only So like, share and comment on the facebook post So that I see your participation Really I’m super happy that I discovered this thing it’s crazyyy I will annouce the winner the Thank to everyone subscribe to the channel to never miss what’s happening here See you soon, see you next time! Because science isn’t waiting ! Ciao !