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How does a pull-back car work? Illustrated teardown
- Muhammad523 3mo agoI really love this site, it is obivous that the owner puts a lot of effort into this
- roelschroeven 3mo agoMuch like https://ciechanow.ski/ https://ciechanow.ski/
- donkey_brains 3mo agoWow. I love being reminded of stuff like this. Those cars were so cool. Edit: I took one of these cars apart as a kid to see how it worked. This site brought back a lot of memories. The little coil spring inside the gear. I have to get my hands on one of these now…
- bluescrn 3mo agoThe original 80s Darda cars were great fun, with enough power to get around great big loops. One of those childhood toys I wish I'd took more care of and kept hold of... They did still produce a version relatively recently (looks like they're discontinued entirely now?), but the cars were significantly lighter and less powerful, all-plastic where the originals had metal bodies
- smackeyacky 3mo agoI bought a Honda Civic toy from an auto parts store recently. I thought it was purely static but it has a spring pull back motion and also flashes the lights and honks the horn when you open the doors. Then I leaned on it and discovered it makes a starting noise and vrooms the engine. I felt like I was 10 years old again.
- matt-attack 3mo agoThis really needs to be done for a GLP-1 auto injecting needle. Pretty sure it’s the same as an epi-pen as well. It blows my mind. It’s a disposable, single use device that at the press of button: 1. Inserts the needle in your skin, 2. Slowly presses the plunger until the dose is injected 3. Then retracts the needle with plunger Three distinct and seemingly opposing motions. With timing. All in a little plastic enclosure. It sure I can think of a toy with that kind of mechanism.
- jrussino 3mo agoCheck out this video from Steve Mould; I think it covers exactly what you're looking for! https://youtu.be/CfhsW1kaa2Q?is=ug5_Ze2HczVMGTMR https://youtu.be/CfhsW1kaa2Q?is=ug5_Ze2HczVMGTMR
- Retr0id 3mo agoUntracked link: https://www.youtube.com/watch?v=CfhsW1kaa2Q https://www.youtube.com/watch?v=CfhsW1kaa2Q (It's a really good video btw!)
- gonzalohm 3mo agoSteve Mould has a great video explaining the mechanism in epi pens
- jaggederest 3mo agoThere's an even fancier mechanism with e.g. glucagon pens, where it actually has to rehydrate the freeze dried hormone (glucagon forms aggregations when it sits, has to be mixed fresh)
- jaggederest 3mo agoActually, after looking into it recently, this is actually not true any more. All the current glucagon delivery mechanisms are either dry powder or DMSO-based, so no actual water involved, and are premixed and ready to go basically the same as epipen style autoinjectors I'm excited for the advent of dasiglucagon which is a non-clumping peptide designed for the purpose.
- dbgrman 3mo agoabsolutely love it! Gorgeous drawing, meticulous detail.
- groos 3mo agoLove this site! Well done!
- asdff 3mo agoWhat is the name for the sort of toy car you push in one direction and it continues slowly in that direction? These ones were usually styled as 4x4 vehicles and almost moved like a rock crawler with the 4wd set to low. They could be pushed forward or in reverse (and then would go in reverse).
- emil-lp 3mo agoFriction or flywheel car. https://en.wikipedia.org/wiki/Friction_motor https://en.wikipedia.org/wiki/Friction_motor
- amock 3mo agoAre you talking about https://en.wikipedia.org/wiki/Friction_motor https://en.wikipedia.org/wiki/Friction_motor?
- rob74 3mo agoWell, you could get it up to higher speeds by holding the car in your hand and repeating the "pushing" action several times...
- reactordev 3mo agoI learned this when I was 4. We even had ones that shot sparks. America. The animations on this are really well done and I loved that trip back to childhood of pulling the car back and letting it rip. However, given the popularity, you should simulate what happens when you pull it back to the extremes over and over again and the spring gets stretched. It no longer kicks as fast as it used to and in some cases, it won't go at all.
- barbazoo 3mo agoIf you have access to a 3D printer, this helps explain the basics too: https://www.thingiverse.com/thing:3308710 https://www.thingiverse.com/thing:3308710
- nefarious_ends 3mo agoyes this print is great, I was very surprised by the performance of the 3d printed spring. I did end up putting rubber bands on the rear wheels to give them more grip.
- tantalor 3mo agoPlease leave my browser history alone
- sreekanth67 3mo agowhat does this mean ? whats the context ?
- AmazingEveryDay 3mo agoI guess as a kid I only had access to the cheap ones? Would pull back, not knowing where to stop, and there was eventually a crunching noise. Then I'd worry I'd ruined the thing!
- kibwen 3mo agoThe "mystery" posed at the end of the OP suggests that that crunching noise was the action of the built-in strain relief within the spring enclosure.
- arjie 3mo agoOh, is that why when you "overwound" it it would make that rapid ticking sound? The outer end of the spring is falling into the next little slot, huh. Fascinating stuff.
- federiconafria 3mo agoYeah, good to know you are not just damaging it!
- khurs 3mo agoGreat site!
- raldi 3mo agoWhy is the wind-up gear needed? Couldn't the axle be connected directly to the spring gear?
- tetris11 3mo agodampens the force somewhat and ensures the car doesnt burnout all the energy at the beginning?
- LastTrain 3mo agoWe had these for my boys. The target age range of someone who can have fun with these ends at about the same age you learn to be careful enough not to break the motor.
- starky 3mo agoThis doesn't answer the most burning question I have, which is why the wind-up gear has the spiral around the shaft...
- tetris11 3mo agoThey used to paint flames there, but wanted to appease the spiral god instead
- raverbashing 3mo agoCool, I'm surprised they are a relatively newer invention (70's) Of course they were bound to be surpassed by electrical cars with remote controls ;) Looks like history rhymes
- amelius 3mo agoIt would be great if this was just a model running in a physics engine.
- 0zer0 3mo agoFascinating animation. But there is one thing I don't understand. What is the purpose of the left axle gear (green)? It is not fixed to the axle because it rotates in the same direction in both modes. Wouldn't is be more efficient to connect the wind-up gear directly to the right axle gear (blue) and through pushing to the left spring gear (red)?
- shlewis 3mo agoOne of my favorite website ever. Delight as always.
- dieselgate 3mo agoCool write up and cool site. Off the top of my head the only other places I see spiral ribbon-springs like this are in a wall mounted thermostat.
- fuzzythinker 3mo agoFor a site that's named mechanical pencil, its mechanical pencil page is too simple. It should add the shake mechanical pencil and the rotating mechanical pencil where the tip rotates 40 deg or so on every click next.
- NoSalt 3mo agoI'd love to see one on the toy car where you rub the wheels across a surface several times in a row to get the engine going faster and faster, then on the last rub, you let it go and it zips away.