Which - 3D Printed - Gear Performs BEST?

[@axtheb]

Its worth mentioning that, when using right combination of tooth size, helix angle and gear width, you can have helix (or herringbone) gear that has smooth continuous transfer of power (next tooth engages before last one disengages), which greatly increases resistance to tooth stripping.

[@Thorhian]

That's what I was wondering about. Doesn't that also greatly reduce the backlash of the gears?

[@saadqadeer7807]

How do you find that right combination though?

[@ge0rge76]

0:24

[@Bertinator-nm9ld]

​@@saadqadeer7807 At an initial guess, I think you'd probably first need to specify gear diameters and teeth length (and shape). Then you could do some trigonometry to figure out how far above parallel the teeth first make contact, and how far below parallel they start to disengage. Then it's just a matter of making sure to pick an angle that lets the next tooth start to engage at the same moment that the current tooth starts to disengage. But I may have to play with some numbers to see if there's anything I'm forgetting.

[@Paul-rs4gd]

The quality of this video is absolutely superb - super clear explanation, great animations and real 3D-printed examples too. It must have been a ton of work. Thank you.

[@Inkkari9]

How much does he pay for these comments?

[@SJWetz88]

45 degree helical pinions can also drive a gear with a perpendicular axis. Generally spur gears can be made lighter and handle higher torque due to the even tooth loading. Both herringbone and helical gears tend to spall and crack at the initial loading point so they aren’t well suited to high torque applications. You can still use them, but you generally need an additional stage to reduce the tooth loading on any individual gear

[@BenFenner]

"Generally spur gears can... ...handle higher torque due to the even tooth loading." This is incorrect. The spur gear teeth individually are weaker than helical gear teeth. Spur gear teeth have less radial support and fail at torque ratings that helical gears of the same thickness and material will survive. You are probably making a bad assumption, because car transmissions with straight cut gears are often sold as an upgrade to handle more torque, but that is because the side (axial) loads placed on the transmission case from the helical gears cause gear separation and ultimately gear failure. The straight cut gears eliminate the axial loads and transmission case flex does not come into play any longer. The greater torque capability comes from eliminating the axial loads.

[@twentylush]

I would consider this video the definitive hobby maker gear guide. It even includes a brief CAD tutorial

[@AlxM96]

Excellent job all-round: the shooting and editing, the flow of the video, the engaging presentations and explanations, all the prints that matched the context being presented, and your clear and concise way of sharing your experience, which is extremely valuable to other makers. Please, keep up the great work!

[@egeelcin]

mate i litterally searched for the reason of that transmission sound difference but couldnt found it. Thanks to you i know it now amazing video

[@ivanadiego6067]

Depending on the dimensions of the helical gear more than one tooth will be in contact all the times compared to the spour gear where only one pair is active. This is what causes them to be smoother since there's no impact as the next tooth engages.

[@SebBrosig]

You failed to mention that the french car manufacturer Citroën chose their logo to synbolise helical gears as a key innovation in their gearboxes in the 1920s

[@scientious]

You can print two helical gears and then pin them together using small bolts if assembly is an issue.

[@adamrak7560]

What about printing the double helical gear as two gears? This would make easy to print and assemble. This would allow you to push them together on the axel, and if the angles are right, forces would push them together during working (or you can glue them together too).

[@ddegn]

Are there any advantages to a double helical gear over a herringbone gear? If the two parts of the double helical gear weren't glued together they'd tend to separate when the rotation is reversed.

[@boulder795]

@@ddegn This is the issue. The axial forces will push the two gears apart

[@adamrak7560]

@@boulder795You can "heat mate" PLA parts easity, so no special glue is necessary. Locally remelted PLA tends to be even stronger than the freshly printed. The trick is to design it to hook them together after melting. So no true welding is necessary which is error prone and difficult to do manually without deforming the part.

[@FriedPineapple410]

The only point to double helix gears is they have the same advantages as herringbone but are far easier to cut into steel. This makes them cheaper to make but due to the gap they tend to be slightly weaker. With printing these advantages don't really mean much.

[@TestSubject173]

​@@FriedPineapple410 Double helix gears might have advantages in dirty environments.

[@ModitRC]

Great video. In the hotrod world, straight cut gears are the strongest, but that's steel. Plastic has it's own concerns. Lubricating plastic gears is essential.

[@trash3570]

Not sure why you think that’s the case. Usually straight cut gears are more efficient, because they have smaller contact area which also makes them weaker

[@BenFenner]

This is incorrect. The spur gear teeth individually are weaker than helical gear teeth. Spur gear teeth have less radial support and fail at torque ratings that helical gears of the same thickness and material will survive. "In the hot rod world straight cut gears are the strongest" because car transmissions with straight cut gears eliminate the side (axial) loads placed on the transmission case from the typical helical gears. Those typical helical gears cause axial loads on the transmission case which flexes, resulting in gear separation which ultimately causes the gear failure. The straight cut gears eliminate the axial loads and transmission case flex does not come into play any longer. The greater torque capability comes from eliminating the axial loads and transmission case flex, not from stronger teeth. If the transmission case is designed to resist the flexing, and keep the gears meshed properly, the helical gear is stronger. Going even further, performance gearboxes with straight cut gears do everything they can to increase the width of the gears (to bring back some strength lost), by minimizing dog teeth height, minimizing synchro distances, and such in the process.

[@HKKyoya]

Me: "I wonder how he designed those herringbone gears in CAD. They look difficult" Resetman: "And here's how I did these in 2 buttons."

[@patrickpelletier9298]

the herringbone gear was the reason the sherman tank's transmission (specifically the final drive) was so reliable, compared to the panther and tiger tanks. the germans had limited amounts of tungsten, so they did the simple spur gear because it used the least amount of inserts to cut the metal. the americans however had a large supply of it, and were able to do a complex herringbone, which didn't break nearly as often as the spur.

[@michaelbujaki2462]

I use a combination of herringbone, straight and helical gears in my projects depending on the demands of the mechanism.

[@thekakan]

Out of curiosity, is there any/what's the advantage of spur gear over helical gear, mechanically ?

[@airsubzero]

Personal Self Notes: - spur gear: cheap & easy to make, sudden contact: Noisy ( slightly higher efficiency because of helical gear always want to slide sideways creating more hear thus more power loss ) - Helical Gear: gradual engagement: quieter, less vibrating and more smoothly especially at high speed but suffers extra axial force because of inclined teeth, ( helix angle ↑: axial force ↑) recommended angle: 25 degree - Herringbone: (R.Helix & L.Helix) eliminating axial forces 6:04 downside hard to assemble

[@angusmillerable]

Just came here to comment: the gears in the preview thumbnail look delicious 😋

[@fralinsandfriends]

My mind is a little blown because I'm not much of an engineer, but I definitely see the advantage of the heringbone gear. 😁👋💖

[@ericsumma7654]

I believe you just touched on the issue with herringbone and double helical gears, that being they cannot be disengaged by sliding action. As a result they are continuously driven. In your video you show each tooth engaging at the outer edges first, then proceeding to the center point. If these gears were tightly meshed this means the point could entrap air or worse, lubricant, creating 'hydraulic lock'. As liquids are relatively incompressible (not compressible), this would force the gears and their shafts to separate causing excessive wear. This is why herringbone gears are typically unidirectional turning, as to mesh the points first. The double helical gears are used where bidirectional meshing is required (rotating in both directions), as 'hydraulic lock' is relieved through the central gap when turning as to mesh at the edges first. So the central gap need not be large to relive this pressure. The axial thrust developed be single helical gear meshing can be countered with thrust bearings. So thrust bearings for double helical or herringbone gear meshing requires two thrust bearings, complicating design and assembly.

[@axtheb]

You dont need any thrust bearings for herringbone gears, as there is no axial thrust.

[@thesuperemeraldboat6194]

Thinking about it I feel like all of those gears are useful in different situations.

[@sebastiandevon9190]

The video I wish to comment ) Thank you for this useful explanation - easy about important. Now I know little bit more about gears.

[@zerojones227]

I'm very new at 3d printing, and your video has been very helpful. Thank you.

[@mattspawn1975]

This is an outstanding video. Well done and thank you. You have earned yourself a new subscriber.

[@Felix199393]

short, informative, straight to the point. yep. this is quality content right here

[@Venaloid]

This video was so much fun to watch.

[@MaxImagination]

Very informative video and well-explained! Great work

[@robertlackey7212]

Great video ! Keep up the good work ! I wonder if some kind of spline shaft would be better than square , you could have a shaft that has a couple splines on top and bottom and flat sides so it would still be easy to print.

[@cynic5581]

I always struggle with herringbone because they are impossible to slide together which means my model needs to consider this throughout its design. I end up making a strong gear with a case that is inherently weaker. It’s easy to have helical eventually rubbing on the housing in a tight design due to axial thrust. Even when it’s held in place that axial thrust is a twisting force trying to bend the gear and axle. I generally end up using a straight cut and deal with a little extra noise in a model I play with for 30 minutes and never touch again. 😂

[@ifell3]

Loved it. Don't give up, you make awesome videos!!

[@asicit6789]

You deserve more subscribers. Excellent educational video. 👍

[@MrElapid]

Great vid & presentation...Thank you! Just bought a printer (Flashforge Adventurer 3 Pro at a decent discount) and A*todesk 360 is an excellent solid modeler, very much like SWorks. I love that 3D printing doesn't break the bank, at least for a beginner.

[@alexandregrynagier1762]

But there's an issue with the chevron pattern. Citroen bouhgt the pattern from a Polish Engineer, hence their logo. That's not the issue. The issue is that unlike common helical gears, you can't make a gearbox change speed by simply sliding the gears. You first need to desegage them, then put them back into position. So it is really cool if you have a direct drive system, (probably with an electric motor), but changing gears with this sytem can easily get quite complicated, in case you'd have a gearbox with variable speeds. Which is often the case on actual vehicles. ANyway, nice video, thank you :)

[@ddegn]

Fortunately gear change ability isn't very important when using electric motors. A DC motor kind of acts like an automatic gearbox. Diesel electric devices use the DC motor as the gearbox for the diesel engine. Do you know if there are other issues with using herringbone gears besides the inability to slide gears together? I second your opinion that this was a nice video.

[@BenFenner]

What in the world are you talking about? Automotive transmissions don't change ratios by sliding gears. They are constant-mesh transmissions, and herringbone gearsets would be no issue at all.

[@ramonoderso]

helical gears are better because they also have more than one teeth in action per moment

[@dvd-R5]

The angle of rotation of the tooth "beta" is chosen so that two teeth are engaged. This is enough to reduce noise. The rest is decided by other gear parameters.

[@borysnijinski331]

A couple dB difference is actually a lot since it is a logarithmic scale. My car has helical gears for reverse…no whine in reverse; I have had cars which did whine in reverse.

[@mediocreman6323]

Here are a few fun facts: • Spur gears were one of the reasons German tanks had that much of a tendency to break down during WW2. Because if you move _a friggin tank,_ and you use spur gears, the entire force will basically hit a single tooth, it will not spread out in any way, which lead to broken gear teeth - and broken transmissions. U.S. tanks had helical gears, and their transmissions were much more reliable, besides running much smoother. • Herringbone gears are indeed amazing. So amazing in fact, that French car manufacturer Citroën derived its logo from it.

[@ABaumstumpf]

"Spur gears were one of the reasons German tanks had that much of a tendency to break down during WW2" And this happens if you only listen to half the story and then think you know the gist of it - nope, you are simply wrong. The problems was nto that they used spur gears. Even funnier no, helical gears are known to be weaker for the same size.

[@senjos]

Very interesting! Good explanation! Thank you :)

[@jumar.anonuevo]

Is there anywhere i could find STL file for that helical gears combination at 5:10?

[@rentaspoon219]

Touring cars use straight gears due to noise not being a problem and needing quick engagement

[@kkuenzel56]

That was very informative!

[@borysnijinski331]

Regardless of the type of gear you still need a bearing that can absorb thrust. Spur gear needs to be designed to have thrust in a known direction to prevent hunting and provide loading on the thrust bearing.

[@jdasfjjtdou5501]

Increase the center distance (a little) and you will be happy. It will be interesting to know how much the noise changes...

[@Kokice5]

This is video is really good quality so i will subscribe for more

[@MrLelopes]

I haven't watched yet, but my bet is on herringbone.

[@hamidkochtschnellerezepte]

Sehr informatives Video und gut erklärt! Gute Arbeit

[@fredtorres1703]

Excellent and thank you!!!

[@themanwithmon6538]

Thank, dude, for this information

[@antoniocross5956]

Great video. Thank you very much! Could you share what plug in you use to create the helical gears?

[@jakejensen4809]

Good and informative. Can never underestimate production costs though.

[@MrAtom631]

Very useful! Thanks for the video. You have my sub

[@patricklepoutre]

Hi, did you know that Citroën car maker logo origin was that herringbone gear?

[@h3Xh3Xh3X]

If you print the annulus in two parts it may be easier to use herringbone teeth in a planetary gearbox.

[@quinnobi42]

As I understand, some racing gearboxes use straight-cut gears rather than helical, which is done to make them stronger, from what I understand. I don't know why this is, but I would guess that the teeth being loaded across the entire surface at once reduces the possibility of a tooth starting to shear off at one end.

[@juanmf]

Very instructive. Thanks. What about backslash (by design)? I need three gears that will never complete one turn, but will go back and forth, precision is paramount.

[@RixtronixLAB]

Creative video, thanks for sharing :)

[@lazyman1011]

Very nice vid!

[@madcrokodile]

So, what do you want to say? Where is endurance tests? Efficiency tests?

[@arva1kes]

Some cars have reverse gears as helical and thus there is no sound even on reversing. I have such a car :)

[@zajlord2930]

i expect to also see the curved teeth gear (very similiar to angled teeth gear) but i guess there isnt that big of a difference from just angled teeth

[@predator8900]

awesome video thank you

[@TylerLL2112]

Great video.

[@Mr30friends]

It would be interesting to see you revisiting the press project. But without the press-channel kind of experimental theme. But instead to see if you can make an actually usable metal bender with enough force to actually be able to make metal parts. Judging by the actuator you made being able to lift almost 100kg while using those tiny gears. You might be able to produce a ton of pressure (maybe literally) if you really went overboard with it.

[@kamurashev]

Can you test involute vs non involute engagement ? That’s one interesting topic. But not only discus it actually test it.

[@Eluderatnight]

Good, consise info. I have a 10krpm motor I'm trying to bring down to 500rpm. I'll try your 1.2mod herringbone concept. Thank you.

[@竹間君takema9]

my english is not very good. so ,if someone want to know what i say can copy to translate 我認為第一種(spur gear)在組裝時是方便的 因為可以在同軸上做移動，可以一直堆疊 至於第二種(helical gear)就沒有相較於第一種方便了，可能需要調一個位置 例如：迴力車玩具。 你可以先把軸安裝好在去放上齒輪，最後再將上蓋蓋好 最後是第三種(herringbone gear)，一樣套用上面的例子 在安裝時可能就需要將齒輪先安置好特定位置上，但到後面安裝軸體跟蓋上蓋就有可能出現問題 特別是出現在多齒輪同軸的問題

[@wowgggearing]

next, make compound planetary gears without carrier arm

Another great job. A unique piece, lots of style and lots of creativity ... Thanks for sharing. (promotion) :-)

[@Source-here]

@Retsetman, You use in video on gears Pla plastic?

[@ahmeth7049]

Güzel ve bilgilendirici bir video. Devamını bekliyoruz

[@z.Burakhan]

Bu arkadaş Türk değil mi? Şivesi çok türkü andırdı kullandığı kalıplarda giriş seviyesi orta olunca emin oldum gibi

[@alee-j8q]

Great!!!! Thanks

[@hertza]

Hello, what is the best and affordable program for calculating and drawing herringbone gears. I use Solidworks very freely, but in it the drawing tools are very difficult, even impossible in the standard package. Thanks for all information in video! Its really helpful.

[@putteslaintxtbks5166]

Is there a way to know what size is best, say for a 1 inch diameter gear, 10 teeth, 20 teeth or 30 teeth. With more and smaller toothed gear, there would be more teeth contact, but with less, each tooth would have more surface and thicker. I would think this may change depending on if they are run at high or a slower speed, 300 rpm or 1500 rpm. Maybe a vid on this? Also, I find planetary gears real interesting and would also be a good video. Thanks for you videos.

[@matekochkoch]

There is no definite answer for your question. It very much depends on a couple of parameters. Helical gears are less efficient. Also on 3d-printed gears the layers add a roughness perpendicular to some frictional forces on helical gears, which will reduce lifetime and efficiency even further. Spur gears on the other hand cause a lot of vibration, because the lever of a spur gear changes with the contact point of the teeth. A spur gearbox has an output speed which swings between two speeds each time a tooth engages. The difference between those two speeds is determined by the size of the teeth. Those vibrations can cause fatigue breaks in materials. On spur gears all the force is always on one single tooth. In general the bigger the teeth the more force (torque) they can take but the bigger the losses and vibrations.

[@TomorrowTom1337]

What if a herringbone and spur gear are combined? So in the middle the portion is straight.

[@nunyabidniz2868]

That's easy: a herringbone gear, which is no more difficult to make by additive machining than any other gear, unlike IRL by cutting a gear out of metal...

[@noyza2132]

there's another disadvantage to herringbone gears. they can't be used with worm gears and are hard to use with crown/bevel gears.

[@sametersoy6806]

Thanks you hocam çok başarılı bir video

[@Roboboy-v6]

Wait, althought the helical gear has less vibration, wouldnt its small initial surface area contact increase the chance of damage?

[@dav1dbone]

How to make metal spur gears? Don't have lathe or cnc

[@animalloveriranian]

Wow very nice idea 💡 👌🏻 💖

[@VictorDolgov]

Btw, the third type was invented by Andre Citroen, so you can see literally it on Citroen logo

[@WhistlingStickman]

if you printed the gears diagonally vs straight on, would it make them stronger?

[@ghorabih]

I believe you when you talk about the sound reduction caused by the helical gears, however, I believe your sound test was incorrectly setup due to the sound of the motor turning the gears. A better sound test would require a motor that is quieter than the sound of the gears. This is a well done and very informative video!

[@pimprock23]

what layer height? do you find thicker layers are stronger?

[@nelchan2421]

how to make a 270 degrees rotation gear?

[@ContadeEstudos-w3l]

hi! nice video. how you did the helical gear button appear?? there's something to import to fusion??? idk if its a joke or if its really a button, would be great if someone help me with this.

[@weld4200]

Put to oppisite helical gears on 1 hearing bone gear ?

[@andrzejj9326]

Hi, what software do you recommend to generate tooth shape? I use Alibre design for 3D modeling but according my knowledge there is no option to generate the tooth shape. Nice video.

[@paulunga]

Huh, I would've thought that a smaller impact zone for helical gears leads to MORE stress at the point of contact...

[@J3n555]

Spur gears are stronger though. Noisy but strongest

[@ashutoshpanda2003]

No

[@rhubarbpie2027]

Would it be worth trying to print two thin helical gears that are mirror images, so you can assemble the item and then fasten the gears into a herringbone with hardware or adhesive?

[@phiros666]

what's the name of the program you use to design theese? :O

[@bspyder4310]

What decibel meter app is that?

[@АртёмМовчан-в7я]

I'm wondering what 3D modeling software do you use?

[@therickestric]

which plugin do you use to create the gears?

[@maxjointoyeurpro5994]

Superbe travail 👍👍

[@friedtomatoes4946]

Can you do a rounded hemming bone instead of a triangle do a curve?

[@ABaumstumpf]

yes

[@vishnudayal385]

Ye gear khape milege sir ji

[@JarppaGuru]

they all work fine. slow speed. its plastic and layers not full cast

[@Matthew-qm5cz]

Is there any sort of clearance to be taken into account when designing these gears. Are the gaps always equal to the size of the teeth?

[@retsetman9698]

If you mean the distance between the two gears, I first find the exact value from the inter-axis distance formula, plus add 0.1 mm or so, so that it can work more easily without jamming, this is more related to the printer.

[@Matthew-qm5cz]

@@retsetman9698 so the gaps are .1mm greater than the size of the teeth?

[@nizamnaim6956]

What is the name of the software that you use to create the gear?

[@dawnbringer6375]

What cad software do you use? Autodesk inventor doesnt have a gear tool