3D Printing Gears - The Ultimate Guide
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- Опубликовано: 8 июн 2024
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Bearing 6x13x5mm 686-2RS: alii.pub/66b1x0
In this tutorial we will learn everything we need to know about 3D printing gears, tips and tricks that I acquired by 3D printing quite some gears and doing dozens of tests with them.
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I just finished assembling the drive train of my robot.
It was a pain to print 36 M2-30teeth herringbone gears @100% fill with 10 walls (perimeters are faster than fill), just for the drive-train!
I advise you to get some lithium grease and apply it to your gears and shafts.
You will not believe the difference it makes.
Before, it ran loud and rough. A few gears even seized and had to be replaced. After application of lithium grease, it ran as smooth as a baby's butt and quiet like a whisper.
I was truly shocked at the difference little grease can make. Lithium grease is the only grease I know that's safe to use on all plastics.
Another trick before greasing, is to run the dry at low speed and pour powered sugar or fine salt all over the gears as they run, to lap them.
As they mesh, the powdered sugar will act as an abrasive. Like sand but finer and can be dissolved in water after.
Then, wash the gears to get rid of all the sugar that got embedded, then grease and assemble after drying.
Hey, thanks for the input! That's such a great idea with the fine salt.
Yeah, I do believe grease will make a huge difference. As I mentioned in the video, I wanted to make a durability test, running all different types of filament for a long period of time, but I couldn't conduct the test at this moment in my studio. And the plan was also to test greasing them will affect their durability. I will leave that for some future tests.
Cheers!
A silicone lubricant works well with plastics. Although I don't know if it's safe for all plastics.
instead of adjusting for elephant foot with bed levelling, first layer offset, or a raft, i will usually apply a chamfer to every edge that will be on the print bed. if the layer expands, it still won't expand more than the negative offset from the chamfer!
Add a little brim, and you have accurate geometry on the part where you need it, and large surface area on the print bed.
That's totally legitimate.
Thanks for the input, cheers!
thanks for all the effort you put into this!
Glad you enjoyed it!
Appreciate the work that you've done for everyone. Keep it up.
Much appreciated!
have been a long time missed your videos
Very interesting & informative, many thanks.
Love it ! ♥
Great video, thank you
Great analysis! For more strength print more (4-6) shells/perimeters and top and bottom layers (4-6), consider internal planar structures for additional interior wall strength. Printing hotter and slower improves layer adhesion and strength. Fixturing is important for the strength tests. As you pointed out, supporting the axle on both sides to prevent deflection and ensuring the lever force is directed directed through the center of the gear rather than offset will yield maximum strength.
Have you considered experimenting with TPU as a gear material? It's reportedly quiet in operation, and has amazing wear resistance.
is it rigid enough for gear teeth?
@@bachaddict yep. You can get stiffer TPU types for printing stuff that needs rigidity
@@bachaddict Yes! It can be, but as with all things, it's properties should be probed to determine appropriateness. Timing belts showcase this property effectively.
The surface can still dimple (eg. grain of sand between teeth) without chipping, and the teeth can slightly bend (reducing wear), and TPU is famously wear resistant. And the softness of the material reportedly also has a side-effect of lower noise during gear operation.
TPU is THE magical material hidden in plain sight -- it's almost as cheap as other filament, with incredible properties and a wonderful material for compliant hinges, functional, and decorative applications.
An object printed in TPU is virtually unbreakable and will handle stresses far better than many other plastics. A TPU "vase" can be completely crumpled, and return to its original form without any sign of damage. As a composite material, it is very interesting indeed.
And if that wasn't all, there are solvents that allow for the joining of TPU parts with the join being as strong (or stronger) than if it were 3D printed.
@@SeanLumly I do not agree that TPU price is comparable with other filament. I bought PLA for 8-13 euro and PETG for 16 euro, but I never saw TPU cheaper than 24 euro. That's significantly more expensive.
@@yansakovich That's fair. But certainly not exorbitantly so. It's also worth noting that while you can fine extreme deals on PLA/PETG, prices via popular channels (eg. Amazon) tend to have similar prices (at least where I'm from). This is what I was speaking to.
Anyway, it's beside the point. TPU is a cheap and flexible material that warrants investigation.
You could also test the efficiency of different materials
When comparing strengths you should divide by mass to get better results
A point about your test setup to determine force to destroy gears. Your pull meter has to be at right angle / perpendicular to lever arm and pull force must be applied in the same direction. Basic Physics.
That's true. It was not the most scientific way of testing but I tried keeping the angle the same for all test.
I tested a gearbox made up of Helical gears for the motor shaft and Double Helical gears, all printed in PLA.
The gears moved a Step Feeder system, with low torque, for about 100 hours.
I did not use any lubricant, and after this time the gears showed very little wear.
A video finally
I get rid of elephants foot by dialing in a little bit of negative "Initial Horizontal Expansion" in Cura. Not sure if other slicers have this function.
Yes, that would work, but sometimes for getting rid of it, you would need more that just "a little bit" of negative "Initial Horizontal Expansion". :)
Hi there! I enjoyed the video a lot - but the backlash testing part got very messed up. There was play everywhere - well, you pointed that out yourself and that’s good. But then… the printed parts could have been made with tighter tolerances. I actually don’t know how to proceed into creating a mechanically correct testing rig to compare them. If the mechanical wisdom affirm herringbone gears have less backlash and the 3D printed part is having more backlash, then it’s clear we did something wrong, right?
Hi there and thanks for the comment!
I admit that I kind of failed to provide better information on that point in this video. I guess, I got lost myself with that much printing and testing.
My initial plan was to also include a comparison with different tolerances, but I didn't do it. Though, it's probably hard to make a conclusion for that matter, as every single 3D printer will have different printing tolerance, so I don't think any specific tips or numbers can be told.
What I have noticed from previous tastings, which is also obvious, the tighter the tolerance, you lower the backlash but then also lower the efficiency as greater friction is introduced. Check @piconano comment out on how he used to "fine sand" the gears before greasing them. It such a cool idea and might help with the overall backlash/ efficiency and even durability performance of the gears.
Cheers!
If you look at the close ups of his gears, the perimeters aren't even printed nicely. You see a lot of random "bumps" sticking out, for example in the printing sequence at 6:40. These bumps basically void any tolerance tests, so that part of the video seems pretty much meaningless to me. On a better printer and with better slicer settings you should actually get a pretty clean, smooth and consistent perimeter that would help to get better data out of these tests.
Great video! Just one thing that may caused the teeth to shear is that you have used many loops. The gears sheared at the transition of the loop and shell/infill area. Maybe a single perimeter (wall line count) and 90-100% infill would result in stronger gears.
Hmm that's would be interesting to be tested.
From my experience with 3d printed gears it's always better to print with (for example: wall count 100 and Infill of 0% ) instead of (wall count 10 and infill of 100%). Depends on the gear size, the wall count must be increase to fill the whole gear even when the infill is 0%. The goal is to connect all walls (outer ,inner and hole walls) together.
I guess the slicer engine might have a significant effect on the results as well, using some variable line width slicers, like arachne, will probably help to have less voids in the print, especially at the root of the teeth where there is a missmatch in the lines. Would be interesting to see if increasing the line thickness and/or increasing the nozzle size has any significant effect as well. I would guess thicker lines and slow print speeds would actually be better to increase the strength?
Good and interesting video.
To avoid the elefant foot I usually add a 0.25 chamfer to my designs. That works great.
And: Please make noise measurement from a distance of 1 meter. This allows real world comparisons for others. Holding the microphone directly to the source is just wrong…
Yep, adding chamfer to the whole gear profile will do that job.
And yeah, someone else also mentioned for measuring the noise I should hold the microphone at a distance from the source.
Thanks for the input, cheers!
Bevel gears and worm gears... where are those .. and talk about the backlash of each please..
Terimakasih,,, atas pembelajaran yang Anda berikan
You multiplied the power by 10.
observing the failure modes of the printed gears was interesting. it seemed like the failure was primarily happening either Wall-Wall or Wall-Infill. I wonder if minor filament under extrusion can lead to weaker wall-wall bonding. I don't like the use of the horizontal expansion setting personally. I think it is better to explicitly model allowance into the printed part before slicing.
I think it's pretty good. Remember that a car with mass ~1t have engine that provide ~150 Nm of torgue. You could probably create ultra leightweight cars for cities with small electric motors with 20 Nm of torgue and these plastic gears.
Helical and herringbone have less slack than straight gears.
3D prints that need extra strength in a particular straight plane like gears, should be printed on a 10° angle/slope instead of flat on the bed.
@07:30 it's impossible for a perfect print . The key is post print processing . File the rough edges down . Àlteratively , you can increase the bottom and top later thickness and sand down the base and top by a little amount to take away any issues .
Try the same test with "mechanical", or iron gears!
It would be interesting how much more force is required to break the gears if the center shafts were kept from moving relative to each other.
Both gears should have a bearing and shaft, the shaft long enough to attach a connecting plate to each to stabilize the viewing side. This way you won't get the "belt bolt" issue over time, and would make each tests far more accurate and comparison with each other.
The connecting bars could be easily gotten from a hardware store in the shelf bracket section. A bar of 4" long with screw holes at either end.
If you want to test durability, reverse the ratio so that the last gear is spinning 16 (or more) times faster than the drive. High speed should wear it down faster, but you'll still probably have to run it for quite a while before failure.
Yes, that's right. I though about that, but then I also though that such a high speed will increase friction and will generate quite some heat that will affects the performance and the test results.
I'm glad for this video but measuring the efficiency of gears without loading them does not make any sense. You could use another DC motor as a generator and actually do the math or you could measure rotational acceleration of a heavy disc or something
Helical gears should be more efficient under loading btw
I agree that my approach for testing the efficiency was not the most scientific nor best one.
Cheers
I found your experiment to be eye opening and very valuable reference for the future.
I thought PETG was stronger than PLA. Me so wrong :(
I had the same assumption. I would like to know the reasons behind this as well.
Thanks again! Well in this situation the problem might be my particular PETG filament. Just like shown in the video, a different brand PLA provides different characteristic, same goes for the PETG. Maybe I had a PETG filament with lower quality. :S
I should have done more tests, but it would be like never ending video to produce and watch if I put everything to the test. :) I know I'm missing some things and could have been better explained and compared in this video, but it's hard to make a perfect video. :)
Cheers!
@@HowToMechatronics That might be an idea for new videos.
Testing all the different brands of PETG in white. Or For PLA+ or Whatever.
I've never seen a video like that. CNC Kitchen and alike do the same tests as you did. Unless the viewer buys the same brand or even the same batch, then there's no absolute rating. From my experience, clear (pure) PETG is a bit harder than color white of the same brand.
Gray gears holes/bolts are loose. Use larger width?
great video as always... i live in the same city as you, can you please tell me where do you get the extruded aluminium profiles? thanks in advance.
Hey, I usually get them from AliExpress or Ebay.
@@HowToMechatronics oh ok... thanks... i thought you found a local resource 🙂 if i find one i will let you know
❤
PLA+ Must be even better since it doesn't break catastrophically?
it softens considerably when heating and has pretty high creep. Not sure PLA or PLA+ are the answer.
My MG995 Servo motor top gear destroyed after excess loading and I want to 3d print.
But it's very small and thin, what do you think is it possible?
I use a resin printer to print gears for MG995 without problems, but I would advise against FDM. The resolution of the filament printer is too low to produce functional parts with such fine details.
Hmmm, that's really questionable. I guess it would work, but not sure how good.
Why don't you test that out and let us know how it turned out.
Cheers! :)
Thanks for all the work you put into this. I must point out that you have made a mistake on sounds levels. Nearly everybody (99.999999%) doesn’t know that sound is measured with a logarithmic scale because of the great variation of levels which makes a change of 3db’s twice as loud. So 50dm and 53db is twice as loud.
That is correct. On top of that, usually the sound level is recorded at either 10cm or 100cm away, so you get some comparable results and you can actually calculate the decibels you would experience at a given distance. He should probably have used either an average or peak hold setting on the mesurement device as well, as the meter in the video is jumping all over the place, so it's hard to pick just one value. When we do sound level measurements we actually move the microphone to different positions in a circle around the source too, as sound can be very directional and you would usually want to pick that characteristic as well to find the worst noise direction.
Doing good, reliable and repeatable noise measurements is actually pretty tricky. The bigger labs have some fancy non echoic rooms and even fully suspended solid bunkers to cancel out most of the external noise and any reflections. You actually feel really strange in these rooms as we are just not used to the silence and audio experience you get in there.
@@ProtonOne11 There is also Db 's and Dbm 's. We use them for measuring radio signal's. Still a logarithmic scale.
You should try to test a "real" gear in aluminium... just to have a reference of how good are 3d printing gears. Anyway, thank you for the video I enjoyed.
Yeah, that would be a good comparison. But a durability test in such a case is mandatory. It's a pity I didn't have chance for this video to make that durability test.
First! Not that it really matters, interesting topic for a video, definitely will be useful~
Confirmed! Thanks
Never been this early wow
You said “elephant tooth” instead of “elephant foot” intentionally to get reactions, didn’t you?😊
If you design a chamfer into the gear, you can avoid manual chamfering. I do that often when it’s critical. And the term is “elephant foot” not “elephant tooth”.
That's right! 😊
9:38 74 dB, not 47dB
Nice catch! :)
Elephant FOOT, not teeth..haha
haha, yeah now I know as well, after reading all the comments... I watched two times the video before publishing but it was pointless, after printing and seeing and talking "teeth (tooth)"... :)
Actually you are also incorrect, its "Elephant's Foot".
It's elephant foot not elephant tooth 😂
hahaha, man, after so many "tooth" that I printed and saw and counted, and talked about, the "foot" became "tooth". :)
You are also incorrect. The correct name is "Elephant's Foot". English is a pretty tough language to learn right?
Sorry ,your contrivance is not stable,The result is not true.Mill is so thin and not
rigid.And there is single force holder aganist your appling force..You must change test your contrivance.
It's not perfect, it's missing some precision and details, but I guess we can still come up with some conclusions from it.
Cheers!
Obligatory elephan *foot* comment. Its foot, not tooth.
haha, yeah! Welcome to the club!
Obligatory spelling check comment. The spelling of the quadruped that you are referring to is "Elephant". There is a "t" at the end. It makes the "tah" sound. And the situation that you are referring to is "Elephant's Foot". Its possessive because it belongs to the elephant.
I will never trust Onshape because it's web based. They can pull the plug and there's nothing I can do. That might be OK for hobbyists but it's no way to run a business.
Fusion looks as web based too.
@@darkfrei2 Precisely why I don't use Fusion. Serious work is often not allowed on internet enabled machines.
Cloud based is the future of softwares. Onshape just doesn’t have the longevity in the industry that Autodesk has which makes it a riskier product by perception. However the product is revolutionary in that it does not require a $4500 machine to run. So yes a risk, but you can also mitigate with data backups to a physical location. Most of these part files can be converted one to the other, if the need were to arise.
@@joshuaboardman3650 Cloud based is worthless and essentially impossible for anyone working under a strict NDA or any sort of security clearance.
I agree with you cloud based is OK for hobbyists and small business, but will never be OK for the big boys. A $4500 machine could be half a month's wages for the operator, it's hardly a big deal.
Oh wow hi Dan
Hi :)
Your Noise levels mean nothing... 1) no one puts there ears near spinning Gears. 2) All noise measurements MUST be done at the same distance from the noise source for accuracy.
I guess you are right. Thanks for the tip!
Cheers
You do bring up a good point about distance for testing noise levels. But EVERY GOOD designer thinks about the end user experience. For mechanical design, noise is a very large compent for consumers.
3) noise and mechanical losses change with load. No-load test has very little information value for application.