How to model Worm Gears (Gears pt 7/?)

[@1endell]

I've been working at mechanics maintenance for 10 years now. My work is to project, mount and improve mechanisms everyday and all theses videos are so accurate to how stuff works. Thank you for sharing this treasure!

[@antalz]

Thanks a lot! Part of why I made this series was because so many videos on this subject were just inaccurate.

[@antalz]

I figured out a better way to do the sweep after I had already recorded everything, so that delayed this video a bit. I'm quite happy with this workflow though.

[@ryanoconnor7957]

I don't seem to be able to select a line as the sweep profile anymore?

[@antalz]

@@ryanoconnor7957 The line is the path, the sweep profile is the tooth profile, perhaps you got that mixed up? Also make sure chain selection is disabled when selecting the path.

[@ryanoconnor7957]

@@antalz I found what I did wrong. I wasn't using surface sweep but solid. I've never used the surface tab. Maybe you could consider a video on the difference between the two and useful things to do with the surface tab, like this?

[@frankg7370]

Fantastic work. I'm an absolute beginner with modeling and printing gears, yet this tutorial made the process easy and fun. 10/10 teaching quality.

[@Liris777]

Incredibly useful video that I have found after 2 years with Fusion 360. I love your lessons, man! Thank you very much!

[@piconano]

Binge watched your playlist. Extremely well done. Thanks for sharing your knowledge.

[@spielp]

Same, just finished the series.

[@kaschberle6948]

Wow, this is great. It helped me a lot. To avoid the issues with overhang when 3D printing the worm, i tried cutting it in half along its rotational axis in the slicer software and printing both halves facing the printbed. It's not perfect, but for low-stress applications like mine it worked really well.

[@antalz]

That's actually a reallygood idea. If you select a very low layer height you should be able to get something a lot better than printing vertically. I do recommend adding alignment pegs to the halves, a small misalignment between them will create a really harsh edge. Thanks for sharing, and thanks for watching

[@DrifidiantoIlham]

Hi, I tried like 4:17 using sweep, but get "Error: There is a problem with the guide rail. Check that it pierces the profile plane and that it is on the same side of the profile plane as the path." Do you know where I miss? Thanksss

[@antalz]

I'm afraid I can't tell, could you send your .f3d file to [e-mail] so I can take a look? Perhaps you could also briefly describe what you're trying to accomplish, if you're not reproducing the video exactly.

[@bp8__163]

@@antalzI am getting this same error while following the video instructions exactly. Cannot compute the sweep for some reason. Thanks for the guide!

[@prkaph]

Got the same error using 3 starts. Changing to 4 starts, doing the sweep, then changing the parameter back to 3 starts fixed it for some reason.

[@timogross8191]

3:37 you somehow created the little triangle "midpoint" that you forgot to mention. Took me a while to fully constrain my sketch. I am so grateful for these instructions and I find them fantastic. Clear and interesting.

[@antalz]

I think I do that at 3:17? I put a midpoint constraint between that line and the endpoint of the helix. Thanks for watching

[@timogross8191]

@@antalz Yes, you do! Did not understand it, but you help me getting there. Thank you!

[@ishantandon9167]

High-quality content as always! Thank you for making these videos

[@antalz]

Thanks again, you're most welcome

[@dgeorgester]

Thank you for the great lesson. I agree that it's quite complete. For the next lesson, it would be nice to see how you would do a globoid worm gear. And even further down the line, to take full advantage of 3D printing technology, a globoid worm meshing with the globoid worm gear.

[@antalz]

I'd like to do globoids, but at the moment I'm still quite ignorant on how to do it. I have tried one design technique but I believe it didn't work.

[@אופיררחמים-י3ג]

can you explain how would you design the wheel gear if you want to keep it spur and not helical?

[@jordanh9520]

Next is double enveloping/globular worm gear sets?? This is my far the best gear series on KZbin.

[@antalz]

I think I can do enveloping wheel, but globoid worm I have no idea currently. OT Vinta has a video on that though, using mathematical curves in Blender I believe. And thanks so much!

[@jordanh9520]

I did see his video, I believe that was the one where he built the worm then cut the faces from the worm to make the gear and scaled them down slightly to allow for backlash. Your design approach is just so much cleaner. I was racking my mind (pun intended) on how to make a globoid worm similar to the method you've shown. I suspect it could work with a ring gear as the basis for the tooth profile, but I have no idea how or even if that can be used to draft a parametric part.

[@antalz]

@@jordanh9520 Aren't you talking about the video from my tech fun? Anyway, my current idea is to create a small helical path with the same parameters as the worm's helix, and then sweeping the right tooth profile along that tiny section of helix. I don't know yet how long that helix is allowed to be before you get interference though, still racking my brain on that. Edit: My tech fun's method leads to a few problems, among which the incorrect tooth profile on the wheel, and incorrect addendum/dedendum. I'm not even sure how much it matters because worm gears are so inefficient to begin with.

[@fafhrd0023]

Really useful video. I have mapped most of this to an onshape project but at 11:00 , which height are you referring to by "H"? It appears to be the wheel gear thickness but I do not understand why that should impact the angle (consider a very wide or narrow wheel gear... why should the angle change?) . I assume I have the wrong height ? (e.g. a 200mm height wheel gear comes out with an angle of 22.6 deg )

[@antalz]

That's because theta is the angle you put into the sweep command. And the reason the angle depends on the height is that if the gear is twice as tall, then the helix must make twice the angle to still get the same angle/length. But yeah that should be the gear thickness. So if you use the exact same values I use, but with 200 mm thickness, then you should have a 143.24 degree sweep angle.

[@fafhrd0023]

@@antalz Thanks - I will check my angles etc. All looking sensible enough but I am new to CAD tools.

[@bobmvideos]

I'm looking forward to your treatment of spiral bevel gears and maybe hypoid too? So far I haven't found any videos that describes them other that a few that do "that looks about right" shapes for the tooth profiles.

[@antalz]

Yeah I find way too many tutorials which only make something that kinda looks okay. I do think I can do spiral bevel gears at some point, but at the moment I have no idea how to do hypoid unfortunately. If you have any good literature sources I could take a look, but it's going to be a while. Quite busy at the moment unfortunately, haven't made a video in over a month now =[

[@steelstone]

I'm preparing a presentation of Straight, Zerol and Spiral Bevel Gear. Fully parametric, as I'm used to 😉 No Hypoid, but also ready to learn from any sources that someone would find and share.

[@antalz]

@@steelstone Really nice, looking forward to those! I imagine it's going to be a pretty long process

[@ryanoconnor7957]

Why do the number of teeth factor into the twist angle? I have 300 teeth on my large diameter gear and the twist angle is less than 0.037 degrees. It doesn't match up at all with the worm. I ended up just doing trial and error using interference and the twist angle I needed was around 0.4deg - more than an order of magnitude off

[@antalz]

Simply put because a gear with more teeth has a larger diameter. Every time you see numberofteeth*module that's the pitch diameter, and when you multiply that by Pi you get the circumference of the pitch circle. There's some more info on that in video 2. If you're still having trouble, could you send your files and questions to [e-mail] please? I'm on the road for a few days, so I'll get to it when I get back, but with the file it's easier.

[@TheHypaaa]

Brilliant as always!

[@antalz]

Thanks a lot once again!

[@smarterreefs6350]

Thank you so much, these videos were extremely helpful and informative. Easy enough for a beginner, but also contains advanced material and also advanced but succinct mathematics. Very helpful indeed, you are an excellent teacher. Thanks again.

[@hemumanchit]

0:24 please confirm if this is always the case.

[@antalz]

I don't know, it's possible that some worm gears might have a different kind of construction. I'm not aware of any however.

[@dianamccandless7094]

You are a fantastic teacher! Thank you!

[@antalz]

Thank you for watching!

[@Butterkekskrumel]

In my current setup, I have problems with oscillations. The period matches the revolution time of the worm. So I suspect that the teeth of the gears do not match well. What can I do to improve the situation? The worm is cylindrical and was bought, so I can not change that. Would making the wheel globoidal help? How would I go about modelling that?

[@antalz]

That could be a ton of things. It's possible you used a slightly different module or maybe the wrong helix angle. Maybe the surface finish on the wheel is too poor? I don't think making it globoidal will help, and currently I don't know how to model those accurately.

[@UzunKamis]

Thank you. I am planning to use a T8 8mm shaft as a worm gear and I have to create a suitable worm wheel for my project. Is there a place that I can get dimensions of T8 shaft with 4 starts? Thank you once again.

[@antalz]

I tried to search around a bit, but didn't get too much. What you could do is model a TR8x1.5 in Fusion360, and then use include->intersect to get it into a sketch. That should at least give you an idea, though the pitch of that rack will be wrong. But when I do that I actually get something that only resembles a gear rack. The pressure angle is just 15 degrees for example. The tooth depth also appears to be shorter than standard.

[@lesterdelacruz5088]

When 3d Printing. Should we add a backlash to the wheel? You didn't mention in the video, at (3d printing pointers) whether or not you ended up adding a backlash to the wheel. Before that, If I'm not mistaken the model in Fusion 360 still had 0 backlash.

[@antalz]

Yes, for real-life gears you should add backlash, though the exact amount depends on the accuracy of your printer. Usually 0.1 or 0.2 works. I use 0 backlash in modelling to prove that the modelling method is correct, there are unfortunately many tutorials about gears on KZbin that are plain incorrect.

[@Tony-rd7gk]

Great video! Does the worm gear use an involute profile?

[@antalz]

Sortof. The worm uses a trapezoidal thread, which is the same shape that is used for a rack. They form a perfect match to involutes. In fact a gear with infinite teeth has these trapezoidal teeth.

[@gerritdehauwere]

indeed great insights and teaching abilities!!! amazing how easy you make it, congrats

[@יואלרוזנפלד-ת1י]

your explanation is amaizing! i'm not design in Fusion360(in soliidworks) i;m missing the equation to build the tooth of the gear(wheel not worm). i searched in previous movies but not find. mostly, according to my knowledge, use with addendom equal to the modoule and d-dendom to 1.25*modoule. do you recommend so?

[@antalz]

It's a bit tricky, because the modelling I'm showing here is in the transverse system for helical gears, where many other places use the normal system. You'd really need to check video 3 in full to see the difference. But yes, your numbers for addendum and dedendum are correct, that's also approximately what the Fusion360 gear generator creates. For some reason it creates slightly too much dedendum.

[@MauricioHernandez-de8is]

Another great video! I would like to see un the future a compound planetary reducer tutorial, thanks for sharing

[@antalz]

Thanks! Compound planetaries are on the list, though I think it will be a while before I make that video.

[@maggge89]

Your videos are great, and would also love a video on compound planetary gear. Especially on stepped-planet gear.

[@antalz]

@@maggge89 I think that's the type I had in mind. That's the type where the planets of both sets are rigidly joined right? I was planning on sun input, stationary ring gear for the lower set, and ring output on the upper set, to hopefully achieve something like 50:1 quite easily.

[@maggge89]

@@antalz Yes, I think so. Do you know if the ratio of the number of teeth and the module, between the lower and upper set of planets, should always be the same?

[@antalz]

@@maggge89 No, within reason the upper set can have totally different module and number of teeth. You can think of the upper set as being a "regular" planetary gearset, where both the spin and orbit of the planets are directly determined by and equal to the spin and orbit of the planets in the lower set. That's why a sun is redundant for the upper set. The only thing you generally want is that the pitch diameter of the upper planet is roughly the same but slightly different than of the lower planet. In practice that means just a slightly different module and/or slightly different tooth count.

[@christopherdaviddigitalcre8887]

Excellent video. Did you ever have any luck with throated worm wheels?

[@antalz]

I did not, I did find a reddit comment that has a promising method for throated worms, but I haven't even really wrapped by head around throated wheels.

[@GabrielDemarchiMaia]

Great video, I was looking exactly for this tutorial(with parameters), complete and well explained thanks :)

[@antalz]

Glad to hear it's helpful!

[@Kineth1]

17:21 you mistakenly swap the worm and wheel in your dialog.

[@antalz]

Great catch, I'm really glad I said it right the second time with steel/bronze/cast iron, and that I was pointing at the gears.

[@gmusic9061]

"Numeber of Starts" could you explain about of this. & diameter is pitch circle Diameter of worm?

[@antalz]

The diameter is indeed the pitch circle diameter, it's equivalent to the pitch line in racks, sortof. In most gears that's just module*number of teeth, but for worm gears you're more free to choose what you want. The number of starts is essentially the number of teeth on the worm gear. If you have 1 start and you turn the worm once, the wheel advances 1 tooth. If you have 2 starts, the wheel advances 2. You can find the same thing with TR8x2 and TR8x8 leadscrew, the former has 1 start, the latter has 4 starts, so a single rotation of the screw advances the nut 4 times further. Maybe you can find better illustrations online because I'm not doing a great job of explaining I feel.

[@gmusic9061]

@@antalz Thank you for the explanation. It's a very helpful video, so I've been following it over and over again.

[@何良-x7r]

Great knowledge & sharing! look forward to your steel/bronze/cast iron sample🤓

[@antalz]

Thanks! I don't think I'll show such an example, I don't have a need for worm gears currently. I would purchase such a set, I can't make it myself.

[@何良-x7r]

@@antalz it is interesting, I had calculated 1 Worm & Gear. The meth parameters logic the same as you. the Worm had been finished yesterday. the GEAR(heat treatment had been finished yesterday) now is waiting for the grinding, my grinder is the busy on other parts, the planed finished date is 12-23. i will share the result to you this week.

[@yuriy77]

Hi, first of all, great explanation and tutorial for the helical/spur/worm gears. I was looking for way to design a helicoid focusing gear set, that are used in lenses. Usually it's 2 sets of helical gears and they work together for moving the optics for focusing. What I haven't seen online so far is how to make an internal/external helical gear set that can be parametric just like you have here in this video. Any idea of it's possible/easy to parametrize that? I'm a relatively new into gear design so don't know the extents of the possible things you can do parametrically. Thanks

[@antalz]

I'm afraid I'm not familiar with those mechanisms. It sound like you need an internal gear, which I show in the planetary gears video. I also do a helical internal gear in that video. I don't know how to do it parametrically, because the gear generator doesn't work with parameters unfortunately.

[@yuriy77]

@@antalz yeah, I need an internal and external gear set. Actually 2 sets. And they are helical gears with a very large helix angle (80°+). Trying to model them by hand, or using the add-ons kinda does the job, but to be able to do them parametrically would be the most ideal.

[@yuriy77]

Here's a short example of a lens helicod and how it works (sort of). I'm trying to find a way to model that behavior kzbin.info/www/bejne/o2SlYYeEoaZ5r80

[@liamgleason3416]

I appreciate these videos a lot, thank you very much!

[@adammckay278]

I am struggling on modeling a worm face/helicon gear, it would be really helpful if you made a video on how to create them.

[@antalz]

I've seen those too, unfortunately as of right now I have no idea how those work geometrically speaking. If you find anything please let me know I'd love to learn more about them.

[@burtonkent4549]

You're amazing at making everything seem both logical and simple. I've also become better at Fusion 360 from watching your videos. Thanks! The only problem I had is the Fusion 360 interface's text is too small to see unless my screen is maximized. Not a big deal at all though, it was well worth dealing with.

[@antalz]

Thanks so much mate! Now that you mention it, the text is kinda small in Fusion360... And I see nothing in the preferences to make it bigger

[@burtonkent4549]

​@@antalz I just tested this in both Mac and Windows. You can change the font size at the OS level, Fusion 360 accepts this change with no problem. Menus do take up more space though.

[@antalz]

@@burtonkent4549 At the OS level, that makes sense. I'll try to remember that for if anyone needs help with that in the future, thanks

[@vaughanrocketry863]

Excellent videos!!!

[@danielsaenz5570]

How Antalz! I really enjoyed this series!! Thanks so much for making it! I've learnt so much from you! Are you still planning on making more videos? That would be amazing! Although, I know making videos is hard, so only if it's possible!

[@antalz]

I do have plans for more videos, but for now I can't seem to get around to making them unfortunately. I hope that'll change.

[@danielsaenz5570]

@@antalz Okay! It's totally fine!!

[@HuFlungDung2]

An actual worm wheel gear is not a helical gear. The worm, which you have modelled correctly, will interfere with the helical geartooth on both the entry and exit side, because the worm is not a rack, it is a helical path, which makes it twisted. This is why your interference inspection at the centerline fails to inform you of the actual interference that exists off the centerline. You're better off using the solid model of your worm as a solid cutter, and cut into a disk blank ( which becomes the worm wheel). You will have to make several of these solid cutter operations with the worm rotated a few degrees around the wheel, in effect, generating a worm wheel tooth into the blank. I'd do this repositioning and solid cutting about 4 or 5 times to get a reasonable facimile of an actual worm wheel tooth. Then isolate one completed tooth and copy/rotate it around the center of the wheel. I have done this in real life machining. It's a bit messy to have a model composed of tiny slivers of surfaces. But it's far closer and better mesh than your helical gear.

[@MihaiDesigns]

Cool video!

[@antalz]

Thanks a lot, your designs are great!

[@Kineth1]

Great video, thanks for sharing!

[@steelstone]

Nice job ! And thanks for the credits !

[@julezsmith4548]

this looks like an excelent tutorial but those are helical spur gears not worm gears

[@igorfomenko9189]

Solidworks toolbox draws toof profile schematically, by arcs, I think the same is in Fusion. I think it is a reason of your interference. It is not a big problem to draw involute, it is interesting geometrical task. Just don't use equations, use geometric relations instead. Otherwise you will have update problem when you try to change geometry because equations are solving after geometric relations. Thank you for video and good luck.

[@antalz]

Those options aren't in Fusion360 unfortunately. If I get another chance to use Solidworks I'll check out those options!

[@becool4961]

GOAT

[@akirasuzuki9269]

How is here because of PS5 Adaptive Trigger