2327 The Hypocycloid Engine
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- เผยแพร่เมื่อ 9 ก.พ. 2025
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I'll bet young folks would benefit from a class or two of your tinkercad tutorials.....you have a way with words that make things so damn clear 🍻
Well done guv!
wow - cheers mate
Very cool! I didn't know tinkercad was capable of such things! Thank you Robert!
Happy to help!
Robert is very creative with TinkerCAD 😄
I use TinkerCad for very complex designs. The only thing missing is fillets, a issue that can be partially circumvented.
i don't know why, but this has to be the coolest thing ive seen in quite a long time. its so smooth with relatively low part count. actually incredibly practical for a project i'm currently working on, i needed a exremely robust and long lasting rotational to reciprocating linear mechanism and this would probably be better than all the other options after a bit of modification.
nice - i am glad it helped
I would suggest to add some steel ball bearings to make it more durable.
@@wurstelei1356 actually, bushings are probably better considering i intend to make it entirely from raw materials. i'll cast billets of high carbon steel then machine it down and press fit with a aluminum shim, i'll only case harden the shaft in the spot that makes contact to make it more flexible. after that polish them and lubricate with graphite powder. i get plenty of graphite powder as a byproduct of making silicon carbide for cutting/abrasive tools (acheson process) so it just makes sense to use it instead of oil for most things.
"If you want to look forward, look back" - So true! Thanks for a very interesting video!
You have truly mastered tinkercad! Thanks as usual, great build!
Thank you kindly!
@@ThinkingandTinkering You should try Free cad. Version one. mango jellies. TH-cam lessons. We'll get you up this speed in no time. And don't get. frustrated And quit. if you don't get the drawing the first couple of times, Just keep at it. And then before you know it, you'll be using a 3D parametric drawing. CAD program. And be 3D printing using G code in no time.
@@nothingelsetolose7661 or save yourself the headache and learn Fusion like everyone else, its free too.
@@nothingelsetolose7661with the greatest respect why would anyone want to get into anything that has a steeper learning curve (my opinion) when with Tinkercad you virtually teach yourself as it's so intuitive. I'm retired now but spent a considerable amount of my working life learning/using autocad (steep) and various others (including SketchUp (less steep)).....when I bought the 3d printer Tinkercad I got completely frustrated with 'certain' recommended modelling packages until Tinkercad was shown to me and it complete changed everything. I use it for anything I need. Rob's videos have reinforced its use! 👍
What I love about your channel is how you give us a be of history, a bit of education and then a very practical demonstration on how to make the thing. Brilliant!
cheers mate
Thank-you for the insights, both about design process and about this very cool hypocycloid engine. Yet another thing to keep the mind buzzing!
glad you liked it mate
You never fail to make my mind race. Allwais thinking of new projects, you are lituraly inspirational, thank you!
oh wow - cheers mate
@@ThinkingandTinkering Same here, Rob! You are such an inspiration, I hope you realize that!
As well as showing some interesting mechanisms, you are providing some very valuable Tinkercad tuition!
Thank you Sir.
cheers mate
I absolutely love your content! It's such a joy to listen to you discuss science topics-you explain everything with such passion and enthusiasm. Thank you for sharing your knowledge and spreading it to the world.
i,m sure you will think of something ingenious as always keep up the good work so we all get our brains working . thank you ,terry
Thank you! Cheers!
Nice! I love watching you think the design through in tinkercad. Thanks for walking me through it
i hope it helps mate
I'm glad I found your channel with your Universal 3D Printed Bearing That Works post on thingiverse. I'm in love with your way of explaining things. Cheers from Canada :)
LOVE seeing the process of making these designs. With my love of engines, motors etc I have links saved on both hypocycloid engines and also the Pietro air motor.
awesome mate
Thank you so much, Rob. I recently looked into 3d printed bearings, saw the slew bearing and didn't think to try it as a universal bearing. I was hoping to find a linear bearing, like the LM8UU, but the one I tried was a bushing and still frictional. And I am delighted at that drive mech, so often in a design, even using magnets, recip to rotary is needed.
nothing wrong with bushings mate
@@ThinkingandTinkering I'm sure they're great but the printed LM8 bushes I tried in PLA didn't work well on mild steel rod. I have to say, I was using 5mm rod and resized the bushings to suit.
From the mad mind of Robert Murray Smith. Absolutely fascinating and you taught me some tricks with tinkercad that I wasn't even aware of.
awesome mate - i am glad it helped
A couple clicks and you're hands on w/ so many mechanisms to learn from or piggyback. F*ck around and find out never fails to educate. great tutorial!
glad you liked it mate - cheers
This is beautiful. I could work on old machines like this all day and night long all week long. taking and would happily keep going non stop until my body crumbles to dust.
You and me both!
Thanks!
wow - cheers mate
@ThinkingandTinkering just a tiny bit of support for some great educational content. And it gave me some inspiration, so thank you.
best tinkerkad tutorial ever, it's great that you introduced it, it's extremely helpful.
Very very educative , instructive and entertaining…!!! Love the wholeistic approach…from the physics to the engineering and construction…wonderfully satisfying!!!!!!
brilliant love these mechanical works of art you make. :-)
wow - cheers mate
How on earth have i not seen this channel before? Im sending this to my nephew to look at. i have been trying to teach him to use tinkercad to get him into CAD and basic design work, and this does a better job than I do at explaining construction drawings lol. Top notch!
awesome - thank you mate
Shining a beam of light to the past and bringing it forward to present day. Can't beat a bit of grey matter and experience.
Your one utubes great educator's.
oh wow - cheers mate
What a wonderful mechanism, and you have found a great way to design and print that mechanism thumbs 👍
Thank you! Cheers!
Loved this video on a beautiful and elegant mechanism- great tinkercad tutorial aswell. Thank you Robert
cheers mate
I appreciate the time you take to demonstrate how you use tinker cad. I'm amazed that you can nearly 3d print anything. The Bearings video was mind blowing.
wow - cheers mate
Its cool to see a bit of the CAD work, I think it contributes to the overall mechanical understanding.
i agree
This reminded me of your bellows air mover (the motor part), except that it has a much more stable lateral motion than the Munsen ring pivoting arm. I've wanted to try that at some point, but I don't have a house (yet) so I don't have anywhere to get hot/cold air from lol. This was a cool build, thanks for all your hard work!
good point mate - it does remind me of that now you mention it
Great video, very informative. I like that you actually print the working model.
cheers mate
Thank you so much Robert. Really great share 🙏 Great way to capture linear motion. The 3d printed bearing was great as well. 🩵 ✨
cheers mate
Tinker CAD sure is handy! used this as a semi-tutorial to get the hang of the interface - thank goodness I have some practice in Inventor - and feel like I just HAVE to use this in something... I love how compact it is in translating rotational into linear movement and vice-versa.
Great workflow, definitely something I need to get better at. Looking forward to what you're doing with this engine!
cheers mate
Really enjoyed this one. ❤
cheers mate
Great explanation of everything thank you. And really neat way quickly laying out mechanism in tinkercad, avoiding resorting to ruler etc. I learnt a lot in a short space of time!
Glad it was helpful!
I saw a model of this mechanism on an exhibition in Aachen. It was made according to drawings of Leonardo Da Vinci.
awesome
@@HvdHaghen Link please! (Scuse the pun)
You are officially the last person to get voted off the island. Stranded on a desert island you make all you need so well that when they ask if you need to be rescued you would tell them, " uh, I guess"
Great demonstration of the engine design, 3D Design and Printing!
cheers mate
I really appreciate the tinker cad segment. thanks
awesome mate - cheers
Each video the pace is going up, more and more come to play, this is so very fascinating to me, thank you Robert
Cheers 👍💪✌
Glad you enjoyed it
It may not be as elegant as a rotary vane engine but it's still an engineering delight.
It's amazing to imagine the skill of the draughtsmen who drew up the plans for those original parts for the Murray's Hypocycloidal Engine hundreds of years ago without the use of calculators, modern draughting pens, etc., etc. !
for sure - but I did technical drawing at school and i am old enough that when i learnt it it was with pen and paper
@@ThinkingandTinkering - and before electronic calculators, there was the sliderule …
Thanks for sharing and showing the tinkercad process
I hope it helps mate
Superb as usual.
Thank you! Cheers!
watched this and wondered about placing magnets on the pole, and having them inserted into the copper coil and ahving the flywheel as a wind or water turned item
I like that a lot mate - very nice thinking
Amazing video thank you very much!!!
Glad it helped!
Thank you very much....
cheers mate
What an interesting mechanism. Great video thanks.
cheers mate
Another excellent presentation. ❤❤❤ Ur videos
Thank you very much!
A 200-year-old engine with the same mechanism can be seen at the Henry Ford Museum in Dearborn, MI.
I love these how to kind of videos. ! Please keep making them :-)
Glad you like them!
Great Video, thank you for your hard work.
Glad you enjoyed it!
neat stuff! thanks for sharing!
glad you liked it mate
Fascinating, although I will have to watch a few more times to get my head around the Tinkercad bit.
I hope it helps mate
Interestingly, at the dawn of the industrial revolution, the idea of using a crankshaft had been patented for a while. This is one of the reasons you'll sometimes see a pair of gears (not arranged like this but two identically sized ones) called a "sun and planet gear" on early steam engines. What that also does is make the flywheel spin faster while keeping the cycling rate of the piston the same, but I don't think that was the main concern.
Thanks ! Learned something today !
Truly fascinating! Interesting if one analyzed the component loads in operation to see if there are any issues.
cool idea
Very cool. And sorry for your loss.
thank you and thank you for taking the time to say that
It's all about constructive geometry, isn't it ? Peppered with well defined constraints.
yes exactly
Especially good for situations where compression is not an option.😊
good point - cheers mate
I shall build one on these in Cinema 4D. Many thanks for sharing!
awesome mate and cheers
you can also rotate the big gear, and this can be used to varry the stroke length of a reciprocating motion. I made a video on this called "hypocycloid variable stroker"
i watched it mate - awesome job - i am going to incorporate that if that's ok
Then there is the "one stroke" engine driving a swash plate.
very true - cheers
It seems to be an intreresting engine design i think it can be used either for puming liquids up or compress air/ gas
Nice translation of maths into mechanics. May I suggest a nice translucent purple material for reference objects to make it clear that they are not part of the output and maybe opposing colours (blue/yellow or red/green) to indicate the negative space you are constructing.
good suggestion mate - cheers
rack and pinion + one way clutch could convert reciprocating motion into rotary.
idea I've had for a 2 stroke ...
two opposed pistons. the piston's motion can control valves akin to "bash valves"
have piston reciprocation drive a toothed rack.
Pair of pinion gears driven by rack
each pinion drives a one way clutch . the clutches engages on opposite rotation
each one way clutch drives a shaft
shaft rotation connected via equal toothed spur gear.
power out via one of the shafts, or spur gears
give it a go building it mate
Great video. Best wishes for the new year.
cheers mate and all the best to you and yours too
Robert ! ! ! Theuh best as usual.
cheers mate
Another great tutorial! Thank you!
Glad you liked it!
Awesome 🎉
cheers mate
Many positive much forceful happiness! Engine make big success journey.
thank you mate
I like the new intro Mr. Smith!
RIP Patti, I'm new here from Morocco.
thank you mate and thank you for your condolences - it means a lot to me
Part of the reason this engine had been running so long is the piston isn't subject to lateral forces with this layout. Also, the piston movement is perfectly sinusoidal. A combination into a scotch yoke?
cheers mate and sure a scotch yoke would be good though it does tend to 'snatch' at TDC and BDC
@@ThinkingandTinkering this cleans that up
I’ve been scratching my head for a while on how to create ring gears, and then when I saw you do it I felt a little dumb 😅
it's a bit of a fudge mate - but it works ok
@ No it’s perfect! Simple and effective.
Have you considered making a double piston chamber Sterling Engine with that? You could make 4 chambers alternating hot cold. Thus your left hand piston portion would be pushing with heat expansions while your Right hand area would be pulling with cold contractions. One of the gains would be the valving would be paired opposites the same place on the rotation would open the cold (In it's own air channel) and the opposites sides hot (again in it's own air channel) but only requiring one sliding valve with two separate air passages. * (Were the lengths of bar shaft shorter you could make all 4 valve opening cut from one long plate of flat material. But since rod length has to be long to accommodate a Starline Engines compression area, which would be right next to a contraction area (They would alternate titles) the valving would be better served as two separate valve chambers each with a single Hot and a single Cold that are controlled via how they are clamped onto the working shaft (a fixed position on back and forth shaft would not allow for timing adjustments.)
* The material for the sliding valves would best be served by a material that does not create a heat sink/Cold sink in it's middle via Thermal Bridging. As you would also not create any air passages that share a common wall for any length.
that's a good idea - i am still pondering the input section
@@ThinkingandTinkering There are Sterling Engines that have a large expansion chamber (about1/2 the size of a pool table) With a little work 2 such expansion and contraction chambers could be made to set on each side of the shaft. I have the room here to set up the heat collection boxes and let them run.
The work shop's progress is I am still hand digging the foundation for Building Number 1. (woodworking mostly) and it's detention's are at 41.3' by 90' The weather here is about 2 degrees F. in the morning so using water to soften the ground is out of Season. As soon as the earth is not frozen I can begin digging a Geo tube 10' down 150' long and it would provide air at 59 degrees all year long. (It would be a win IF the Geo tube could power the fan to run the air through the Geo tube (as near a perpetual motion machine as I would care to try for.)).
Interesting and thanks. Reminiscent of a Scottish Yoke? In terms of the rod's motion.
it is reminiscent - but the scotch yoke does tend to 'snatch' at TDC and BDC
Oh go on, play with it a bit more for us!
definitely mate lol
This could be a replacement for the Scotch Yoke cam used on the Bourke engine. Does the bar reciprocate twice for each rotation of the flywheel?
oh that's good thinking mate and yes it does
I think this was to get around the crankshaft patent, i think watts held it.
Wow, are you related to the engineer, that designed this Steam engine? One of the few examples, employing this funky mechanism.
Cycloidal motion has potential for engines. So now we need a cylinder on each end of the central drive shaft, clone the unit, and connect the two shafts of the units together. Now you have a low friction 4 popper. How could one make them function in balance? Could two drive shafts actually move by reciprocation?
Pretty cool, I think once me made good linear generators the conversion into rotation isn´t as "needed" anymore. Most machines can be electrified instead.
i think it will be a good few years before it is obsolete mate
@@ThinkingandTinkering Obsolete ? Oh no it won´t be obsolete, just less frequently used.
this is off topic:
i just saw an "electret" an object with a permanent electric field, the plasma channel guy made one, that is very interesting, you should make a video on that topic or even build one its like making a magnet, i wonder if that electric field could be used to make a current and how much it would last
i iknow about electrets mate - i can make one if you like
@@ThinkingandTinkering that would be awesome! =) im really interested in what that thing could be used for
Always enjoy your videos! I'm not sure if you've done a video about this before, but is the hypocycloid gear similar to a blacksmith's flypress?
no mate a flypress is basically a great big screw turning on its own axis
@ThinkingandTinkering thanks, I was a bit confused about that.
I think the gears on the Birmingham engine should have been twice or 3x the size for more torque at the flywheel
maybe - but it was what it was and you can't take away from the fact that it has been running since 1805! that is pretty impressive in itself lol
Mr. Murray-Smith, I have vague memory that James Watt couldn't use a crank because it was patented, I also recall that drawings of the Watt engine showed a ring gear and planet arrangement similar to the one you've featured at about 1:30. I'll likely never know, but makes for some interesting speculation.
Watt used a sun and planet gear not a ring ear - but he did it for exactly why you say. Actually it was William Murdoch but he worked for Watt so Watt patented it - this was in 1871 - this engine was created in 1805
I like it!
Are you printing these parts on that massive ELEGOO?
no on the flashforge Adventurer pro or the Bambu carbon - they are small parts
This presentation has drastically changed some of my heat engine driven configuration plans! \(^_^)/
Goes to show, one is never too old, smart, or wise to continue to learn, grow and invent!!!
GREAT SHOW ROBERT!!! (~_^)-b
wow - from you that is praise indeed mate - i have nothing but respect for you
Condolences! 😳
thank you for taking the time to say that mate it is well appreciated
In the 1970s, a Dutch company built a car with a Hypocycloidal engine. Project was abandoned at an early stage because of unexpected and insurmountable vibration. I remember it, but can find on trace of the engines history today. Regardless, It seems impossible to design a 4 cylinder horizontally opposed engine.
porsche has a patent for a 6 stroke engine that seems to be hypocycloidal
always a dangerous thing to say something is impossible mate lol
Nice video, Anthony
lol - cheers mate
Robert,
Fascinating content in a lively presentation, but would you mind using a cheek microphone for your audio,please?
Thank you
Great job! What are drawbacks ? Why is not used more ?
you might notice it is not very compact
What an awesome mind you have
i've been wondering about a mechanism but don't have the tools to build it.. a horizontally rotating wheel that has a second unbalanced wheel mounted on its circumference, spinning around the rim so it rotates at the same speed as the primary central wheel... so the weight is always kicked out in one direction and rotated back in towards the centre in the opposite direction... like a kid kicking its legs out on a swing... wondering if the whole thing might move in one direction if the structure was mounted on a mobile platform... any ideas for a simple mechanism to rotate both wheels in sync?
to be honest i would actually encourage you to get the tools and give it a go - dreaming and doing are very distinctly two different things and you learn and achieve so much more when you try
first let me say I love your channel. When I tune into one of your videos I can count on you engaging my brain. Thank You.
With that in mind I wondered why do you call this an engine? It seems to be more of a transmission changing linear motion to rotary motion. What do you see as the benefits to this design over a crankshaft system?
cheers mate - it's part one of a two part video - to be honest I haven't decided on the power input yet - then - of course there is the option of making it a generator - ah so many possibilities - even so the completed thing is an engine and i will be adding that second part soon - the main benefit is there are no sideways forces
@@ThinkingandTinkering I seem to remember a diesel piston layout where the piston was in the center of a cylinder with a combustion chamber at either end. the piston was driven back and forth which would fit right into the hypocycloid. I can't remember what the layout was called, it's kind of like the opposing piston design but with a combustion chamber at either end and only one piston moving end to end. I'll see if I can find the vedeo I saw.
Is cutting the negative of a gear the right way to do a ring gear like that, or just a convenience for an unloaded demo model? I would have thought that a ring gear would still need convex tooth faces for proper engagement.
the right way? It's a way and It works fine - i have done several tutorials on ring gears including modelling them with onshape - but for this a cutaway is fine - it's never a question of what is 'best' only ever a question of what works, what is appropriate and what gets the job done - given the video is really about the use of construction drawings how you do the ring gear is really up to you
@@ThinkingandTinkering Fair enough! It can be so easy to fall into those weeds when explaining a design process, but you keep things very clear by avoiding tangential minutiae (not easily done). By the by, I live near the Ford museum, but I can't recall if I've seen their example of this engine or not. I'll have to keep my eyes peeled next time I'm there! Cheers :)
@@jamespray it really can mate - I went there once about 5 years ago - amazing place i really want to go again so I am jealous you live so close lol
Question:
The center line is symmetrical. If driven by the shaft the turn-around points have an ambiguity, it may spin left or right with equal probability. To ensure that for oscillating linear motion the rotational motion is always in one direction it must thus require a (small) perturbation to break the symmety. Without that it won't turn the same direction with every thrust.
How is this done practically?
(I can imagine uni-directional gears or a ratcheting mechanism may be used, but what is an elegant way to ensure this? Is that perhaps why the actual engine has all the extra epicycles in the back?)
i believe thats the point of the flywheel so momentum would keep it rotating in the same direction as it passes each end point
So what are the advantages? Its seems the primary one is the force on the 'con rod' is straight.
Is it a failure of my imagination, or is it impossible to have a bank of cylinders like a straight 6. although a radial arrangement would be possible?
i would think that was the primary advantage - but that is quite an advantage