ฝัง
- เผยแพร่เมื่อ 31 พ.ค. 2024
- Topics covered:
0:00 Modelling a helical gear using sweep
2:10 Creating a herringbone gear using mirror and combine
3:15 Creating a double helical gear
4:41 How to compute the angle to put into the sweep command
7:28 Positive and negative twist angles, or handedness
9:34 Transverse and normal systems
13:26 Shaft angle is sum of helix angles
15:06 Axial forces in helical gears
17:42 Herringbone gears can't slide into mesh
19:28 Herringbone gears do have a handedness in most cases
20:39 Helical gears have better contact ratio, so they run smoother
22:19 Machining the different kinds of gears
23:57 Comparing the method demonstrated with a helical gear generator
27:34 Herringbone gears and grease/dirt trapping
Full gears playlist: • All about gears
Next part (racks): • How to model Gear Rack...
For the Emmett gear bearing see:
www.thingiverse.com/thing:53451
This old Tony did a great video on cutting spur gears:
• Gears! - But Were Afra...
These are some resources that go far more indepth on helical gears:
www.sdp-si.com/resources/elem...
khkgears.net/new/helical_gear...
Section 4.3 on khk's awesome gear guide:
khkgears.net/new/gear_knowled... - วิทยาศาสตร์และเทคโนโลยี
![[TH] VCT Masters Shanghai Playoffs DAY 1 // 100T vs FUT | FNC vs GEN](http://i.ytimg.com/vi/erQ7pGChzxA/mqdefault.jpg)
I naively googled how to quickly model some gears in fusion 360 and now, after having watched the videos I have a whole different level of respect and fascination for mechanics and gears in particular. Spectacular work! Please more of that!
Thanks so much! More will be coming for sure, though I don't know for sure when.
Wanted to find gold, found a diamond. Arguably the best video about gears.
Man, I'm banging out these videos in the series and all I have to say, is 1 random guy on youtube can make insanely well explained high quality videos with illustrations in 30 mins, how can my University professor with 30 years in the field not explain these in an understandable manner in a 3 hour lecture I'm paying close to 10k a year for??? Shocking! Definitely earned a sub from me
@antalz has put lots of thought, afford and time in this series.
It does take a lot of thought for sure. First to ensure I understand everything correctly, then trying to figure out in what order I can best show everything, writing the script, lots of recording attempts. A common rule of thumb on TH-cam is that 1 minute of video takes an hour of work, and for this series that sounds about right. Maybe a little less than 1 hour.
@@antalz That's fair enough, I'm not trying to diminish your work put into this video at all, but similarly lecturers have years to improve and iterate on their slides and explanations yet (sometimes) fail to do so being paid for it haha
This video was the best birthday present. I spent most of the day yesterday trying to get my custom designed Herringbone gears to mesh. I was able to diagnose the problem as incorrect helix angle but wasn't sure how to produce the correct angle. I went to bed last night thinking "all I want for my birthday tomorrow was to solve this problem." I woke up, did a fresh google search which lead me here. Your video is the only source that I was able to find that clearly shows how to determine the proper "twist" angle for a given helix angle. My problem is solved, my gears are dope and the telescope I'm designing to use them on is gonna be sick! Thanks brother.
That's great to hear, and I hope your telescope is coming along well!
Brilliant explanations. Wonderful examples. You break down and lay out a complicated series of concepts in an easily digestible way. Fantastic instructor. My hat is off to you.
Thanks so much mate, that's really encouraging to hear!
I learned how to model and print functional gears using fusion 360 after watching your videos. Awesome tutorials that I can't find anywhere else on TH-cam. Keep up the great work and thank you.
Thanks mate, it's really encouraging to hear that my videos are helping people achieve their goals!
Excellent series on gears, thank you so much for your time and effort!!
Sir, I remember barely passing my college Calculus class with a C; it took most of the mathematical brain power I possessed at the time, which has surely diminished since then. So, long-story-short, I am not a mathematician. That being said, I truly enjoyed your detailed explanations of gearing and gear engineering. It is fascinating to watch how the mathematical calculations work to produce the required product. Very cool! Thanks for posting this information; it gives a better understanding of how to approach the drawing process within Fusion 360. Much appreciated.
Thanks mate, thanks for watching
Oh boy oh boy! I've been looking forward to this! You are my go-to guide for anything gear related when it comes to accuracy! :D
Thanks for that mate, comments like yours are really motivate me to keep going!
@@antalz No problem! There's an upcoming game called GearBlocks coming out in a while which will be a large gear mechanic sandbox, so I've been brushing up on my knowledge. I saw your videos by chance during a youtube spree, and I felt that no one had gone into detail, explaining concepts like pressure angles and such, the way you do. You made it clear how important small design changes can either make or break a mechanical project. Engineer text-book grade!
Excellent video. Thank you for the informative video!
Your videos are just great ! u can't find this informations else on youtube. Ur channel is so underrated i'll try to share it with my friends.
Thanks mate, that is a big part of why I started this series. A lot of this information is presented in incomplete or even incorrect ways, so I really wanted to make something that's concise, complete and accurate. I hope I'm achieving that goal.
these videos are great , no missing info
I've been binge-watching your videos, please keep making more. You're very helpful!
I'm hoping to, not sure when though. Thanks for watching and good luck.
This is one of the more interesting videos about gears. Especially the theoretical parts are explained understandably and invite one to explore the physics of things. Thanks.
Thanks, I'm working on more parts for the series, I hope you'll enjoy those too
Amazing video! Thank you so much for your time and dedication to sharing your wealth of knowledge and explaining all of the details and pros and cons!
Thanks a lot mate, thanks for watching
Brilliant work mate
Thank you very much for your time put into explaining and showing us all this. Excellent video series!
Thanks! I've run into some delays with my tank, but hopefully I can get that going soon so I can finally do part 4. I think I'll also make a video on bevel gears, and I'm still experimenting with worm gears.
@@antalz Subbed :)
Hello! These videos are amazing! Please continue posting videos! :)
Definitely dropping a like!!
Wouahh... Amazing explanation, love it! Thank you.
Take care 🍀
Awesome. GREAT video, all of them in this series.
Thanks, I'm hoping to expand the series with bevel gears soon. After that helical gears.
Highly fascinating! @Antalz, I admire how perfect your explanations are. Job well done! I cannot wait to watch the rest of your videos.
Best in 1.25x speed :)
Thank you, let me know if you run into further issues. And using speedups can help a lot, these are long videos after all.
This is really great, clear and pedagogical!
Thanks so much, glad you enjoyed
Nothing I didn't already know but I liked the video.
Subscribed.
Thanks for watching! Do you have a lot of experience in gearing? Maybe there's something in the rest of the series that might be new to you.
@@antalz Sure, I will watch all your videos of course.
Best video to explain the gears.
Thanks, happy to hear it's helpful!
Fantastic videos i like how you go in depth and even say shortcut keys. i have never used fusion360. I think i will give it a shot thanks
Thanks and good luck! The tutorial should work fine in other CAD packages, they tend to have the same kinds of commands. If you need any help let me know.
Can't wait for part 4. These are great. But too few upvotes. People, don't forget to upvote.
I have a suggestion. Please edit the description, to link to the next part.
That's a good idea, hadn't thought of that. I put all the gear videos in a playlist, would it be better to put a link in there to the playlist? Or both?
Perhaps asking for likes and subs in the video would help, but especially the tutorial content I don't want to spoil with a sales pitch like "Before we get into it don't forget to smash that like button, and if you haven't already please subscribe and don't forget to hit that notification bell to ensure you get notified any time I upload a new video, and hey why not share this video with your friends? Thanks guys it really helps a lot, now let's get into the video". I'll just have to be more patient I suppose to get big numbers. But thanks for admonishing people in my stead!
Thank you so much!
Thanks for this great video. I really learned a lot about gears and how to design them with Fusion 360.
Great to hear, thanks for watching
Just a note on gears and lubrication, good, clean oil will provide an oil film between the gear teeth. This significantly reduces wear. The herringbone gear type is especially suited to this but requires a good oil circulation and filter system. Either that or extra clearance to prevent damage from the grease or dirt as you described.
Thanks for a great video.
John
Thanks for that insight, I think the surface quality of the gears may have a big impact there. On a smooth machined gear that oil film will form, but on FDM 3D printed gears the surface finish is much worse, so maybe then a thicker grease is more appropriate? Oiling and greasing is a really fascinating topic, the physics is really weird and I know little of it.
HI. I would like to create a worm gear reduction. the (single-start) worm h?diameter of 4.5/4.8 mm and the towed gear with 9 inclined teeth diameter 6.0/6.3 mm. I create the gear by setting the number of teeth and the diameter and it calculates the module. I would like to know if I can set the module when creating the worm. Thank you
very instructive, thank you!
No problem, thank you
I've been cracking my head at the same things. I really like normal module helical gears (being a mechanical engineer). But modeling that thing with solidworks and getting the clearance enough for gears to rotate but not so for the planets to come apart (I was making a planetary system) was a nightmare. I literally had everything worked out and printed a working version yesterday and today I saw your videos with fusion 360. RIP my time spent in those things. I really liked the thinking behind double herringbone gear. Didn't think of that earlier. Thanks for the info. Really great series!
Thanks so much! I personally prefer to work in the transverse system, the math just comes out easier. The normal system does work of course, but all your shafts and distances become such weird numbers.
@@antalz Shifting to transverse system now. Life gets easy.
That was great! I would never have figured out how to do gears like this...even following the tutorial I had issues. Totally great though. Now to figure out how to extract the twist parameters from the existing gear I need to copy and I'm golden. Cheers!
Thanks mate! It's a tricky subject, so I'm happy you were able to figure it out in the end. For reverse engineering an existing gear I got a few ideas, though I'm not sure if any of them are any good:
1) Measure the outside diameter and the number of teeth. Use that OD = m*(N+2). This will give you a transverse module. Most existing helical gears are in the normal system, so the normal module should be some preferred number, like 1, 2, 0.5, you can find lists online. Try to figure out what the helix angles should be for different likely normal modules, and one should stand out as the most likely
2) take a picture from the side, as straight-on as you can. Draw line tangent to the gear tooth closest to the center. Measure the angle between the tangent line and horizontal. You can do this in Fusion360 by using the picture as an attached canvas.
3) Measure how much a single gear tooth twists, and measure the thickness of the gear. Essentially directly measure beta and h, and then do the math from the video in reverse. I have some idea in mind for how to do this with a custom jig, but it's quite a lot of work to make. If the other methods don't work we can talk about this more.
Best of luck!
@@antalzI will try it later today. Importing the picture is a GREAT idea.
Follow up. Turns out the piece is a nylon compound gear...a thin wide helical gear on the bottom and a narrow larger spur gear on top. I had assumed it was two separate gears. The spur gear has three partially sheared off teeth. I tried to rebuild the three stripped teeth on the spur gear with some steel impregnated epoxy but that was a dismal failure. So it's back to 3D printing. Cheers.
@@kennethwood9200 You can find the module of the spur gear using that formula I gave, OD = m*(N+2). Just measure the OD and count the teeth. Good luck, if you run into any more issues do let me know, I'm happy to help
simply great. thanks
Thanks a lot mate!
Awesome video! Could you do a video on bevel gears? There are almost none and your's are very useful and concise!
Thanks! I'm actually looking into bevel gears and worm gears right now. I got an idea for how to do bevel gears but I'm not totally sure it produces a good gear. I want to be dilligent with this because you can find a ton of gear tutorials on youtube that are just inaccurate.
@@antalz Oh that would be very nice! Please take your time, would be awesome to have another superb and accurate video :)
I really appreciate you making these videos--SUBSCRIBED!!!
QUESTION: I am trying to make a 3DP reduction drive for a radio tuning capacitor (6.35mm shaft) and a I need about 8-10:1 ratio. I figure for the pinion, I need a minimum of 6-teeth (correct me if I'm wrong on minimum teeth utilized in a design). The other requirements are that it be as small as possible and still be 3DP, and that preferably it have zero-backlash--a lot of back and forth tuning movements are used to properly tune in a signal. So, what is the smallest practical/reliable spur or helical gear that can be printed using a 0.4mm standard nozzle? And, would the helical or herringbone pattern be better for backlash? I realize that I can brake the tuning-capacitor shaft but would like to still not have any backlash in the gears. Could you share some thoughts on this? Thank You for making this series...
"Wait a minute" something wrong here? No! Just watch the complete explanation to the end and be patient. Finally a lot was explained to "mesh" my information again. Thank you.
Great to hear, thanks for stopping by
Great videos! We need a worm gear video!
Thanks mate! I agree, but I haven't quite figured out how to do it myself. I have an idea but I'm not totally sure the final geometry is correct. I'm pretty sure I have bevel gears figured out though, so that will come, though not soon because there's a bunch of other stuff I'll be doing in the next month or two.
Nice explanation and no video wasn't long but interesting.
Another excellent video, thanks for posting. Any plans for a video to cover design of beveled gears?
Thanks! Yes I do have that planned now, I got a pretty good method now based on "Tredgold's approximation". I first want to complete my Hobgoblin remote controlled tank and the video about ring gears though, but yeah it is planned.
Havnt watched every minute but really good video!
Thanks mate, you can use the timestamps to skip to the relevant bits.
Hi, great videos. I have a question. How do you model herringbone and helical gears for a given center distance between to gears with different number of teeth? You have explained it very well for spur gears. Thanks!
It's basically the same, except that instead of the regular "module", you must use the transverse module. If you're working in the transverse system that's easy. In the normal system you'll get really weird numbers for center distance, you'll just have to deal with that unfortunately. It's hard to target a specific distance in the normal system.
I need to make a replacement helical gear that drives a rack in a machine tool. One method I have considered is 3D metal printing. This series will enable me to model and print a prototype in PLA before committing the design to a commercial printer. Thank you..
Thanks, it's really good to know my effort is helpful to people
Your videos are tantalizing beautifully explained. I made the herringbone gear with twisted angle and followed your formula's, but I don't arrive at making a herringbone rack with twisted angle. A hint please?
Are you trying to make a rack or a herringbone gear? I think it's important to understand what all the symbols are, especially that beta is a helix angle and alpha is just an angle you put into the sweep command.
I am having trouble meshing helical gears of different sizes. I am using the same diametral pitch, so they match perfectly as spur gears, but when I sweep them to make them helical, they collide. Any advice?
Are you putting the correct angles in the sweeps? Keep in mind that if the gears have different tooth counts, then to achieve the same helix angles, you need to enter different sweep angles into the command.
@@antalz I was entering 30 and -30 as the angles. But one gear was twice the pitch diameter. How should the angle differ? Should the smaller gear be half the sweep twist angle? For example, if the large gear has 30 degrees twist sweep, and the small gear has a 2:1 ratio, then the sweep angle should be -15 degrees? I will try it anyway to check :) Thank you for the response by the way!
@@PoohTheWinnie At around 5:00 I go over it. Notice that module*numberOfTeeth is in the denominator, so +30 for the small gear and -15 for the large one should work.
update: I tried it and it looks like it works :). I also tried yesterday using GF Gear generator, which works but the gears look a bit boxy and as you highlight in your video, do not have the root fillet. Thanks again!
Hello! The equation: Sigma = helix angle1 + helix angle2 does that equation work for normal spur gears, of course, their helix angle is 0 degrees. Just curious, Thanks!!
Does it mean the Helical gears can be used as an angle gear as well? Or is better to use more conventional angle gears, e.g. bevel gears?
Helical gears do work if 1) the shafts are not parallel, and do not intersect and 2) the load is light. A "crossed" set of helical gears creates sliding friction on the teeth, and the higher the helix angle the worse it is. It's definitely better to use bevel gears if that option is available to you. Bevel gears require intersecting shafts though.
Why wouldn't you use the the Coil function to twist the Gear? You can put a pitch angle which would make things easier or am I missing something?
Could you describe the complete workflow for that? I've tried a couple of things like sweeping the whole gear on a helical path, and sweeping a tooth on a helical path, but they don't lead to a good gear. You also can't put a pitch angle into the coil command as far as I can see, your options are revolution and height, revolution and pitch, and height and pitch.
@@antalz I am sorry yes you are right you cannot insert a pitch angle.
I already started writing a long comment how I use the the coil function to model the gear, however I found a video that does basically what I do:
th-cam.com/video/DT0nZn9B72M/w-d-xo.html
@@maximilian.arnold I have three issues with it still:
1) coiling with a custom profile is not available in Fusion360. So you have to make a coil first, then sweep the tooth profile along that path.
2) If you do that the tooth profile doesn't turn the right way. This is more noticeable if the helix angle is steeper, and he uses just 10 degrees. Moreover he doesn't show a crossection of meshing gears, I'm not entirely convinced his method is accurate. Specifically I worry that he's mixing up normal and transverse modules, an error that's hard to see on small helix angles.
3) With all that said, his method seems slower than what I presented too. It's a 5 minute video, while my demo took just 2 minutes.
Which cad software is this ?
Autodesk Fusion360, but the ideas work in any CAD software. Some CAD softwares have inbuilt generators, which are quicker of course. There are plugins for this for Fusion360 too.
"Herringbone" are smoother, if I understood correctly the reason why... I believe it's possible to reduce the backlash to zero with this model, correct?
Herringbone and helical gears are smoother because the teeth go into and out of mesh over a longer period of time. However they don't allow you to reach zero backlash, in that they are limited just like regular spur gears
Even though the process is kind of right, the start sketch does not correspond to an helical gear profile....you can't start with the teeth dimensions of a spur gear and just sweep it along a curve, extrude it twisting it. The size of the tooth itself is different from a spur gear....
I'm doing everything in the transverse system, because it's easier to explain and easier to do. I think you're thinking of the normal system, and the tooth profiles in the normal system aren't different per se. They are still regular involute curves, it's just that the normal module and transverse modules are different, and the normal and transverse pressure angles are different. But they're still involutes all the same, in both ways of looking at it.
I Seen a lot of old machinary that used herringbone gear, but i guess they was casted, so they was probobly casted out of two heicalgeras or something like that
I think they would shape or cut two helical gears and then put them together. You can cast a herringbone gear, but usually you want to come in afterwards to clean up the tooth surfaces, and that's hard with a herringbone.
@@antalz I don´t quite remember. But it was a bunch of machinere that was old.. talking like 19-centary old.. or at least was original produced that long ago. There was a bunch of diffrent eqivpment but all of it used the same gear. My guess is that one company made loads of gears and sold to other companies around, they had to be fairly cheap to make, they was i pretty much everything.
@@antalz it might have been a double helical... the thing is i visst a farming school next to where my cussins live. They had sort of a section with older equipment.like handcranked or belt driven. Anyway all the equpment had Open gears that was fairly common back then. I never seen hearing gears prior so I asked my cussin about it. And he thought there was norhing strange about ot and they had some equpment on there farm with the same sprocket.
Anyway when we got home to them he showed me a potato sorter. The fun part was that it was freaking identical to one we had at home. The only diffrance was that our at home had straigt gears and there had hearing one.
The one we had was really noicy, and theres was almost scilent.
Since then when ever I se a farm museum i got to se what kind of spockets they have. And I seen a few diffrent. The strangest i seen is helical with a tracking rail to keep them inline.
@@matsv201 That sounds really cool, I wonder if it all has 14.5 degree pressure angle. I kinda wonder when 14.5 degrees went out of style.
@@antalz i cant remeber, but the image in my mind is that the angle was pretty steap
Helical Gear Generator Plus seems better.
I do wish though that it could change parametrically after the fact.
I imagine the spur gear generator is actually better in that regard, because you can manually modify it, but then have all of your new parameters apply.
Cancel everything I said. None of it worked. Am very disappointed. Id really like to see a gear generator that actually changed with parameters.
I think scripts and add-ins can't work with parameters. You can draw the involute manually, see: th-cam.com/video/NaW4jWARFdY/w-d-xo.html
The add-in is probably much easier, the only difference I think is the root fillet. But by modelling the shape yourself at least once you understand the geometry better. And part of the video covers forces and other theory of course.
very well exlained. but i feel like it's to well explained, almost as you try to show a 2 year old how to put those square, triangle and circle shapes in their holes in boxes.
literally demonstrating that you can't push a herringbone gear in sideways and such... feels like people in need of this type of explaining will not and should not try to build anything :P
sorry for my negativity but i just felt like a child while watching x)
That's a fair point. I kinda belaboured that point specifically because I'd hate for someone to have a beautiful herringbone planetary gearset modeled in CAD, only to find out there's no way to put it together. I still have a 3D printed motor housing that took 20 hours to print that can't be assembled.
I do have chapter markings in my tutorials, so you're totally free to skip to the next chapter if I'm belabouring a point too much. You can also set playback speed to 1.25x or 1.5x.
Don't worry about being critical, it's very nice to hear encouraging and positive comments, they motivate me to continue making videos, but critical comments help me make those future videos better.