This is why worm gears are so cool...

[@Venaloid]

Some points of clarification: 1. The worm itself is a gear with only one tooth, hence the gear ratio observed. 2. Worm gear drives *can* be back-driven, depending on the ratio and on the friction between the gears. It is not wise to assume that any given worm gear system cannot be back-driven, though it is often true.

[@sethpolevoi4027]

Also important to note that worm gears are the most inefficient gears. Spur gears are over 90% efficient and worm gears can be as bad as 50%.

[@Venaloid]

@@sethpolevoi4027 - Oh I've seen worm gear systems go down as low as 40% efficiency: there's a lot of friction, BUT, their compact size is super handy, especially for things that need to be carried around.

[@SurgicalAxe]

You can spin a worm gear with a worm wheel if the helix angle is sufficiently high.

[@jwonderfulsuccess]

What would the ratio be for it to be driven back. Im working on a project and really depending on the worm to be driven back functionally and smooth- also 3d printed

[@keyboardheroism]

​@@Venaloid Better to remain silent and thought a fool than it is to speak up and remove all doubt.... Thanks for speaking up about your knowledge of the principles of worm gear drives.. chapter 1..."'can not be driven". Check out the the Torsen differential design. Really cool worm gear application 😎

[@Brick_Science]

cool dude! great way of explaining. i love worm gears!

[@wolfgangtatzel3706]

Yes - worm gears are cool- check out my worm gear 😊😊😊

[@jimmymelonseed4068]

I just learned about these at work! Never knew why it took so many turns to open a water service valve, and how it did it in such a small space

[@AstonishingStudios]

Would you say you are good at playing the violon, or the ukulele?

[@MistahPhone]

What is a violon

[@aidanc9328]

It's a violin

[@Dragon-Slay3r]

Its long dude

[@aunabreslingaming3279]

"I play games" .....figures

[@HawxAnimator]

get back to making lego videos!!

[@vandacrewsailing]

Hell yeah I used the exact hoist you showed in the video to build a centerboard hoist for my sailboat! Worm gears are awesome!

[@Everydayisagooddayyy]

I love how talented you are! Explaining wise and violin wise! I listened to that part three times!

[@Madman6505]

They are also used in torsen limited slip differentials. They allow the car's drive wheels to turn at different speeds when cornering and will also transfer torque to the wheel opposite of the one that's slipping/starting to slip.

[@pantherplatform]

Worm gears are what make cable elevators move up and down but stay put when the motor stops turning the driven gear.

[@logandihel]

Very concise, interesting, and educational. Great video!

[@LoosiuFlying]

Nice demonstration ! And good explanation. For Your information - worm gear can be designed to be back driven - for very special use cases.

[@HelloKittyFanMan.]

Yeah, as in modern cars with electric power-assisted steering instead of hydraulic.

[@acmhfmggru]

I came here because I encountered such a back-driven wormgear in a music box assembly and I was curious why it could be backriven forward but not backward. I noticed the (not-worm) gear had an asymmetrical profile so I assume that's the reason, but I was going I'd find an explanation online... Nope! 🙃🕵️🏿‍♀️

[@Gambiarte]

Forgot to say that worm gears have lower efficiency than common gears. Also, it can be backdriven dependending on its construction. But yes, it is nice anyway!

[@dondywondy]

Also it conveniently turns the output 90 degrees to the input

[@glenc5185]

Also used in torse differentials.

[@wendolinmendoza517]

I did learn something new with your video! Thank you, it is very interesting and curiousity-fostering!

[@greggriffin3005]

LEGO introduced me to these in the 1990s. Great explanation on how they work here!

[@keyboardheroism]

Torsen torque bias differential is an excellent example of a utilized worm gear design. Can only drive. Cannot be driven. Thx

[@BraydenGoluba]

This is beatifully informative.

[@Dilshad-gu7je]

When designing our own worm gears, what are the parameters we need to consider? How do we design them successfully?

[@3DPrinterAcademy]

Fusion 360 has a really good add-on called "GF Gear Generator" it can be used to make very precise worm drives

[@bbbndddl]

The most important thing is the fact that they are really bad when it comes to effectiveness, they shouldn't really be used anywhere where you can use any other type of gearbox. Printed worm gears are really fragile, soft and don't have most of the benefits that the precision milled metal ones have.

[@JoeLaFon3]

I liked it when the Sharpie cap squeaked 🤗

[@pushkarlimbu6689]

Thanks for the answer that had been in my head for a while.. Now I can sleep well!

[@arbjful]

Any idea where to get a tightly toleranced worm gear for a stepper motor?

[@MRCAB]

The circular saw use would allow for a bigger motor that wasn’t sticking out to the side and getting in the way.

[@niceguy4423]

today i learn something. tks

[@jruicker1]

Another nice reason is that it changes the angle of the gear axis.

[@ugurunver2403]

They are basically diodes of gear based torque transmission.

[@wendolinmendoza517]

Interesting point of view!

[@sigalemiri]

Can you transfer movement from the gear to the worm?

[@chrisbysize]

1:20 misconseption: A worm gear can be driven backwards. Depending on the ratio it takes only 3.4Nm to turn the worm gear via the blue gear. Rattling without any force within the play tolerances is not really an evidence.

[@RocktracksSC]

how did you get 3.4 Nm?

[@chrisbysize]

@@RocktracksSC by using a digital torque meter with 1/2 inch on a 1:40 gear ratio design for a transfer case motor.

[@RocktracksSC]

@@chrisbysize Interesting, also I imagine pressure angle would also influence this number. Thanks for the info

[@lebronjames1844]

Mechanical Engineering is so beautiful bro

[@stevens4689]

Any circular saw i have used allows me to spin the blade by hand. Why don't they lock

[@manuelmejia-h4o]

Exelent I will like to see that turning both ways also the ratio different ratios .

[@shottysteve]

bro the sharpie and gear audio gave me an extreme shot of bill nye vibes

[@thenextproblem8001]

Another great feature it offers is that you can convert circular motion to linear motion or vice versa

[@marcosrp3740]

no

[@mohdsajid4976]

That's rack n pinion

[@RixtronixLAB]

Nice info, thanks for sharing :)

[@jenildodiya2689]

Which material you have used to print this worm and worm wheel

[@pythonboi5816]

It could be back drivin but only when the worm drive isnt that flat

[@Jareyousure]

reason why cool 1: worm gear is the solution if you need very compact high gear ratio 2: you can't turn the last gear but only can turn it on the first one

[@Funnycatgavin12234]

Can you make a another generater gearbox

[@paramtrx9558]

Nice! Thx!

[@DanJonesShow]

I like it!

[@garramiro]

technically speaking, when using low ratios of reduction worm gears are reversible. One needs to install back-stop devices in gearmotors with low reduction ratios.

[@martinfisker7438]

As a general rule, if the effiency in the forward direction is over 50%, the gear can be backdriven. This is also true for high ratios with very low friction

[@FamTech.]

Your video's are great! Ceep on going to make video's!!!

[@EilikHatesUTTP]

My recent lego build uses this mechanism

[@KazuyaYuza]

Nice video. Subbed.

[@tunakann7629]

Lego gave me an emmence hatred for worm gears because my baby brain always expected a 1:1 gear ratio and got mad when it took forever to spin

[@robertojuarez959]

I once had a toy train that had the exact same mechanical mechanism😅.

[@CenReaper.]

You can back drive a worm gear with a proper gear module.

[@luke475]

Imagine trying to spin the normal gear at 1000 rpm with the worm gear

[@AntiViGames]

But can you make a worm gear that looks like an actual worm.

[@ManWithBeard1990]

not being able to be backdriven can be a huge disadvantage, too. If you were to use one in an application where you spin up something really heavy up to a significant speed, it's completely possible for it to self-destruct when the motor unexpectedly loses power.

[@sergeb7945]

Worm gears are highly inefficient, due to very high friction

[@Science-Vlog]

Cool!

[@jwonderfulsuccess]

Thank you for telling me it can't be back driven ouch. Im trying to get 2 vertical rods to turn vertically by turning a knob horizontally. Please help someone. Whoever helps will have 5 years of great luck! :)

[@Trisha_an_Artist]

That is the most balalaika sound I've heard from a violin

[@aaronalquiza9680]

elevators use worm gears too!

[@dmitryastapenko6650]

Cool! ratio ~ 1:20

[@akshayr2862]

Afsal 🎉

[@BobBob-ye4vz]

wow

[@gaudhamnv1424]

Good as

[@steffenrosmus9177]

And they work even better when made with an printer that costs more than 20 $.

[@libbychang413]

actually a worm gear can be back-driven if the tooth (thread) only has one revolution...

[@R.sabarinathan]

thankyou buddy @3DPrinterAcademy