5 Lego Technic Gear Alternatives
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- čas přidán 1. 08. 2024
- Hi everyone, in this video I'll discuss some alternatives to gears. Except of #2 and #4 they might be not that useful, but maybe still interesting...
Enjoy watching,
2in1
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Links:
Rebrickable (part list, .io file and 3D viewer):
rebrickable.com/mocs/MOC-128640/
rebrickable.com/mocs/MOC-128642/
rebrickable.com/mocs/MOC-128643/
rebrickable.com/mocs/MOC-128644/
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Timestamps:
0:00 Intro
0:06 Gears
0:16 1 - Treads
0:46 2a - Beam
1:36 2b - Axle
2:14 3a Bevel Gear Alternative #1
3:21 3b Longer Transmission
4:19 4a Big Pantograph
5:11 4b Small Pantograph
5:50 5a Bevel Gear Alternative #2
6:56 5b Longer Transmission
7:50 Thanks for watching!
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#lego #technic #mechanism #gearbox #gears - Věda a technologie
I got a lot of comments stating that some of the mechanisms are fragile or useless. Here's just a reminder that the main purpose of this video is to learn something about mechanical principles, not to never use gears again. Of course it's better to use bevel gears than #3, but #3 just looks cool :) For example #2 and #4 are even useful, but that's not why I made this video
Enjoy watching :)
I wouldn't say its useless, something like the pantograph would be pretty useful to replace a lot string of gears, since the lego technic chain is terrible and constantly snaps under any load.
well the reason you got so many comments is that you worded the title of the video as if you were presenting a usable alternative to gears. a better title might've been "interesting alternatives to gears in lego"
How about a little challang: Build a motorized 4x4 drive train without gears. Bonus point for suspension ;-)
I'm sure I saw somewhere that an early differential used on early hotbulb motors for agri equipment used a principle very similar to #3 and was very reliable.
Question, can you make a Pantagraph chain?
The beam one amazed me, how clever. Thank you for delivering your amazing content that help our creations development, keep up the stunning content
This is called a "linkage" in engineering context. The issue I saw with the second example was that the force on the linkage was in the same direction as the friction fit of the parts. It's prone to pull itself apart under load.
Fewer moving parts means fewer things that can break. Great content 👍
What about 3a? It's bigger, adds moving parts, and adds friction from every moving part having to slide on an axle.
#2 is mechanically overdetermined (with plastic it works, but don't try this with anything that is stronger). If you run the numbers you'll find that the driven end of the rod is not describing a circular path and the angular velocity also is not constant anymore (if the wiggle point in the center is fixed).
If you got 2 circles on each end the crossing point of the wiggling strut vs the connection line of the two axis will move ALONG the axis.
PS: yes, that is experience talking, I tried to use something like that and learned the hard way 🙄
You're completely right, in this case the gap is big enough for some wiggle room, but you can't apply that mechanism to something that has to be precise (it's not constant velocity either). That's why I included #4, which is mechanically correct but has more moving parts
I don't suppose this is like U-joints, where using a second one would correct back to constant angular velocity? Also, I wonder how they got around this with steam locomotives, where one drive axle was driven by the engine and drove the rest using rods connecting the drive wheels.
@@SkorjOlafsen _"using a second one would correct back to constant angular velocity?"_
No (based on how the path of the driven endpoint is being distorted).
_"how they got around this with steam locomotives, where one drive axle was driven by the engine and drove the rest using rods connecting the drive wheels."_
No pivoting is happening there. This mechanic turns the turning direction of the driven wheel vs the driving one.. for a steam loco they all turn in the same direction due to the connecting bar keeping it's orientation (no pivoting).
i am read wor d
@@joansparky4439 they also had the other side of wheels offset by 90 degrees as well as counterweights in the opposite side of wheels, (so the left side rod was at the lowest/highest while the right one was on the most backward/forward position) you see the same thing in combustion engines with pistons and crankshafts although with those they also use full 180
I have seen several of these on older (often steam) farm equipment. This makes sense as back in the day many of these would be easier to fabricate or repair with common farm tools and materials, whereas most farms (then and now) lack the capability to manufacture precision gears which are perfectly balanced. For low rpm devices than can stand wide tolerances, these would be fantastic, and were. I actually had the opportunity once to run a steam driven water pump that applied 5a/5b.
keep in mind most of these mechanisms would have more linear inertia and vibrations than their gear counterpart due to linear motion so its up to your design to compromise into either fully rotary like gears, or with linear mechanisms as such.
Ye, but how cool do gears look in comparison? Not nearly as!
@@Reblwitoutacause unless its specified in the requirements, coolness is something we dont consider in engineering design xd
@Ao Yuki you ARE an engineer. No sense of humor nor sarcasm xD
Just playing and joking
@@Reblwitoutacause engineers always have a screw loose somewhere, you just gotta find where it is
Every alternative was great, but I found that 5a/5b was especially impressive! Very nice!
it looks beautiful in action. would not be out of place in a GBC.
Plus iirc it works at any angle, and iirc that also means it works for changing the angle while it's rotating if you use some sort of connection that can change its angle.
@@HaveYouHeardOfManedWolves Do you mean the angle between the axle rods? Interesting, with the right connection it can indeed be variable.
@@Sokail87
Yeah, if the corner pieces were replaced with a piece that can bend, then the resulting linkage can work at any angle (even if one or both sides are moving within a certain plane)
A couple of these look useful if you want to stop torque twisting axles too easily. The tiny pantograph looks like a cool mechanism for all sorts of applications. I might try a few things out.
I really like 2b, you can use the middle pin as a reciprocating output if needed
I was thinking that as well!
Almost like a figure eight, wouldn't take much to turn that into a well-aligned reciprocation.
God, as an engineering student seeing this shit is always awesome!! Knowledge in so many fields can come from and go to so many places. Always keep an eye out for nifty things and ideas, you never know when or where you could use them!
This is really cool!! I think it could be even cooler if you reduced the gear ratio of the initial motor so we could see it moving a lot slower, but still very cool.
#4 reminds me of these mechanical legs that somebody put in his bike, or these huge walking robots that are more like art than anything else
Yeah same, I think they’re called Strandbeests.
So freaking cool. This makes me wanna go dig out my old legos and try to imitate these.
Well done!
Very cool mechanisms, thanks for sharing!
I would love to see these stress tested to failure for a few reasons:
1. Capacity: knowing how much load each can take both nominally and at failure to know which are capable of the highest load and also very high rpm.
2. Mode of Failure: seeing what broke will allow you to possibly compensate and increase capacity depending on the mode.
3: unforeseen effects at high load, such as massive vibration, heat generation, skipping of cycles, or warping of the module leading to failure or inefficiency.
Chains and driveshafts, obviously. The moving beam is a pretty good idea though.
I will keep in mind the beam/axle drive extension. Often I want to bypass the usage of many gears but chains present too much friction. This looks somewhat more efficient, and the inherent fragility present in the assembly could almost act as a fail safe against excess torque in the system.
Amazing content, thanks a lot for your vids! This one is longer then usual it seems, a nice surprise :)
Would love to hear more of your commentary on pros and cons of those designs and where you can use them
Edit: also, could it be possible to use angled axel joints in the bevel var.2? Would it remain as robust as the 90 degree one?
Yeah, in this case I'd recommend using #2 if you want to create longer transmissions without gears and less backlash, or #4 if you need something more robust than gears...
It is possible to use angled axle joints, and the cool thing about this one is that you can also use that principle to make a constant velocity universal joint: czcams.com/video/nYLRZBvCwPE/video.html
1 - Good ol' chain drive. Very robust and efficient, likely the best alternative to replace a long gear train.
2a - It's okay but a bit overcomplicated for the task.
2b - Slimmer, simpler looking than 2a. Looks way better, it might fail under load though (the rounded T join may be pulled off the end of the axle)
3 - Very creative! Also makes me unreasonably upset. It's a great demonstrator of translation-rotation conversions, but it's super inefficient and fragile. You would never want to use this thing to power any machine, ever.
4 - This one looks fun. You can probably attach things to the moving joints to do god-knows-what.
5 - This looks very cool. And dangerous, for me. Don't let it anywhere near long hair.
Yeah, let's not talk about the usefullness of #3 :)
Even #5 has a high friction. The only useful ones except #1 are probably #2 and #4 because #2 doesn't have that many moving parts and #4 is pretty robust
@@in1 #5 is actually used in some designs for 90 degree drill attachments
@@in1 #5 is a simple CV joint that just doesn't flex. If you replace the 90* connectors with swivel joints, you can aim the thing in all sorts of different directions, and it will work just fine
@@kuhljager2429 #5 is definitely pretty good, all though under really heavy loads you might run into some torsion issues. A few reinforcing rings and maybe some springs or a pusher plate to keep the sliders from getting out of sync under strain would probably be enough to make it take a beating though. You just want to keep the amount of unsupported travel to a minimum for best results.
Totally epic man! Really had a great watch here!
i really like steampunk settings and i always find Lego videos like this really good to find inspirations for machine parts on a steampunk setting
Lots of these blew my mind!!
Hello there
General Kenobi
@@Xx_ToterTigerLP_Rockt_LoLxD_xX 🤣
I have an orange S too
Mortal combat Scorpion “ Get over here”
@@Xx_ToterTigerLP_Rockt_LoLxD_xX you are a bold one
I could see these going into some great steampunk models.
For the first one, the bar covered in gears, the alternatives all have sliding between parts which may cause them to wear. A better solution may be to replace the centre piece with another rotating bar, like the ones at the ends, so the whole thing works like a set of old train wheels, so three bars coming out from the shaft, all connected to a single long bar, so if you rotate any of the shafts they will all rotate.
The problem with this solution is that it just gets stuck at the turing point where all the cranks are aligned.
@@in1 if one of the cranks are driven it shouldn’t really.
I have now acquired the knowledge of Mechanical Lego Principles 01
Thanks for the ideas this can reduce the use of gears
2:00 bro went super wiggle mode
Great video. Some cool concepts are shown. I am only worried about some of them having problems with friction. For example these moving bars for wear out
would love to see more of this
Definitely gonna use this for FLL
Awesome! #5 is also self-tightening!
rlly helpful thanks
brilliant execution.
I wonder if it would be possible to replace the two 60483 pieces in #2 and #4 with liftarms of different lengths, to reproduce the effect of gearing up or down. And if so, how the ratios between different liftarm lengths would work.
Exactly, but even if you make a side of #4 bigger, the "gear" ratio stays the same...
This is amazing!
The n4 thing looks like it is pulsating when it is moving and I can see someone using it when building that is supposed to be alive or alien.
All very cool, but those beveled gear alternatives baffled me. Very cool!
That is next level engineering.
Especially the 3rd one
I realized the main principle of how these work is changing rotational motion -> linear motion(?) -> rotational motion.
You never fail to amaze 😲
Thank you for a great video
A bit surprised a pair of bevels driving a crankshaft didn't feature although that is a boring design, it's essentially what you'll find under most cars.
Belt drive deserves a mention as a self-tensioning version of the featured chain drive (treads).
Also, pretty sure the beam driven systems could be further simplified by running the drive beam directly between both output cranks, with the cranks indexed to the same position. But running it across with the 90° angle looks so much cooler.
Of course bevel gears are pretty common, in this case I didn't include it just because the video title was "Alternatives to gears"
I actually built the belt drive and wanted to make it something like #1b, but somehow managed to forget recording it
The beam has to be angled in this case, because when you just connect them without something in the middle, the other end will just oscillate because you don't force it to turn over. When adding another crank in the middle, it will just get stuck in most cases.
I think it might be interesting to build something that has decorative gear alternatives that are connected to the actual working gears, so that it looks like the decorative mechanisms are doing the work.
These hit different at 10 pm
Can confirm midnight adds a new layer of hitting different
I play a lot with lego but I hardly ever use technic pieces, when I saw the 5a and 5b my mind exploded 😂
Great video 👍🏻👍🏻
Really cool!
moving beam/axle causes alot more vibrations. it has pros but also cons... so maybe mention the disadvantages as well. thanks..i like the idears!
Those pantograps would probably make a nice quadroped walker robot if you add some static legs to it and double the mechanism. It had a distinct up&down stroke on an angle for each end, perfect for legs really.
Yeah I tried around with it a little bit, but the scrapped the project because the walker wasn't really compact at all. Maybe I'll continue trying and upload a video about it when I get it to work, not sure...
Just wanna say, beam will transfer rotation unevenly because of pythagorean theorem (like a universal joint).
Yep, that's why I included #4
Remember, Friends. The only one here that's actually good in the real and industrial world is the pantograph. Sometimes the beam, If you really do need it. The others aren't smooth and create unwanted stress because of it. Even the beam has it's flaws, Being that it has to rub against the middle post. Friction is the machine killer.
. . . Though I will admit, The transmission has always been amusing to watch.
This is so cool. very interesting and unique ideas. Keep up the great work! You give me lots of content to binge while I procrastinate on 3 projects due tomorrow 👍
5 may be a bit impractical due to friction, but man it looks cool. Perfect for a steampunk-esque build.
Nice job.
Well some are helpful or just look plain out cool. Very good video like 6:47 was looking good. Yes sometimes they are not as effective but it looks way better than gears.
I liked for the walking beam, I was astounded at tye wizardry of 3a.
#2 (Or rather a similiar arangement of two crankshafts) where actually used in German mines before the spread of steam engines to transmit power over a cople fo hundred metres from waterwheels to the mineshafts where the power was use to drive pumps or elevators.
,,,,,a cool video keep up the great content.. Thank you….
Could've told me 7 years ago when I tried to make a rear engines, fwd ping pong ball hopper
Wonderful.
Wish I knew this sooner
Good video. 5a is a kind of CV joint.
the Thing about Gears is that you generally don't get the osilation that beams and other horisontally or vertically moving mass gives so unless you are trying to make your mashine slither about or jump I would sugest using gears for most drive trains. not to meniton 99% of the time a gear asembly is more compact then most of these alternatives.
I think it’d be far more useful to demonstrate a use-case as to why the alternative would be used. I work in mechanical engineering and one of the few things I’ve struggled with is teaching the new hires what they’re looking at
Thank you
bro the bevel gear 2 was trippy as hell
chain/belt drives are common but are there any examples of these other transmission methods being used irl?
#4 is based on a Pantograph, which is actually also being used in different real life applications
A modified version of #5 is used in constant velocity joints
i believe 2 was used on the wheels of steam trains
All of these would be great for building where they can be seen, instead of hidden like usual.
cool! 😀
these were pretty clever! are they all 1;1? if so it would be cool if you could create some different gear ratio without the use of gears!
Maybe the first one (use a bigger/smaller tread wheel on one side), but the best option would probably be a belt. I built it, but forgot to include it in the video :)
Hey can do u do a video about alternatives of changeover Gear? (The Orange One)
You could use the first mechanism from this video: czcams.com/video/1WeNkikqeOs/video.html
combined with a changeover catch (part 6641) to archieve the same effect
moving beams is energy loss on back and fourth motion unless it goes in counterbalanced formation
I have recently returned to legos ( after a 30 year break). This looks absolutely amazing. Thanks for giving me a taste of what can be done. The last one was mesmerizing. Is there a way to get the motor to run more quietly. My electric car can go 80 MPH and make less noise :)
No, Lego motors are loud and you can't really change that. Glad you enjoyed the video :)
Someone’s been watching those mechanical principles videos I see.
Wish you would have explained the pros and cons of each setup
1 Lego Technic Gear Alternatives alternative:
worm
I have gained the knowledge of mechanical principles
I wonder if #2 and #2b have any applications in modern vehicles.
Not really, because technically it's not 100% right, so you can use it in Lego which has a big wiggle room anyways, but not for real life applications. A variation of #4 is being used in real life, though (Wikipedia: "Pantograph"), maybe even in vehicles
Question about 2a and 2b, what is the point of the guide in the center. Isn’t the beam already restricted to moving like that without it? Just wondering if I’m missing something. Either way, beautiful video I like it
When you don't use the thing in the center, the mechanism gets stuck at the point where all the cranks are aligned
@@in1 makes sense actually, thanks for the answer!
How are these for gear ratios? All 1:1?
Yep, you can modify #1 for different gear ratios, but creating a gear ratio without Gears, Treads and Belts is pretty much inpossible
can you make offroad venichel
good
That one is cv joint
You should use all of these to build a machine that does nothing but
Yeah, you're right, that's a missed opportunity
For 2b is there anyway to make the middle part spin to?
Not really. You can do it by keeping the rotating beam parallel and using 3 cranks, but it will get stuck then...
@@in1 but can you make 2a spin if you use 3 cranks?
@@Hm-nc2of It won't work, if you don't spin 2 of the cranks
@@in1 ok
@@in1 if there is a another crank in the middle of the beam in 2a does the middle crank spin to?
I’ve got one way! Use a flywheel!
Any Mathematicians here?
correct me if I'm wrong, but I believe 2a and 2b with the linkage transmissions are Not Constant Velocity joints?
No, they aren't, mechanically they aren't even 100% correct. That's why I included #4
#1 Works With Any Thread
Cool ideas 👍
I think if you slowed down the motor it would better show the movement being transfered through the mechanisms, but good video
Thanks for the feedback!
*[Her]:* “He’s probably thinking about other girls.”
*[Him]:* 5:39
#4 is very good IMHO!
Do any real life applications use these?
#1 ofc treads, but not as a power transmission
#2 Steam Locomotives
#4 Pantographs are actually a real life thing to copy movement, you can look it up on wikipedia
#5 Not really real life, but it's the same principle as a "constant velocity joint“ which is being used in real life
@@in1 just looked at the pantograph thing, very interesting
Video was very interesting too! I think it would be good to add a bit where the motor is going slower so we can see the mechanisms moving in slow motion
#3 hurts my soul because that just looks like it's screaming in pain
I wanna use 5B to power a four-wheeled vehicle
Yeah, would look fance, but have a lot of friction :)
@@in1 I was imagining using one on each wheel. Looks like I’ll be warm for the winter then
The real best solution would be to put a single big sprocket in the middle. The other solutions are pointlessly fragile and have a lot of loss of power at their needlessly many moving joints.
But in many builds the space is limited so bigger sprockets would fit properly.
@@GrillerRohde Most of the options in the video probably cost more volume than a single big sprocket.
@@SmartassX1
Some do, others don’t.
It’s always specific for each build but in most cases a bigger sprocket should be fine.
4 this is a really necessary mechanism for elevators
Interesting...
Comment for video interaction metrics
they auclly did make right angle drives like 3A
With the exception of 2, you're looking at a lot of power loss within these movements.
#1 and #4 are probably even better than #2, but yeah, there's more friction compared to gears