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Testing 3D Printed Stackable Gearbox
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Күн бұрынHead to squarespace.co... to save 10% off your first purchase of a website or domain using code michaelrechtin
This 3d printed gearbox way outperformed my expectations! I think it can even be stronger with some minor design and printing changes. Let me know if you guys have any recommendations on ways I should test or use it. Thanks for watching!
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@senorjp21 Жыл бұрын
The modular design is great - even for repairs. But the forces increase with each stage, so the size of each stage should increase, too. i.e. the planet carrier on the last stage could be bigger and stronger. I could see your design getting used IRL. Obviously you are a mechanical engineer.
@robertoguerra5375 Жыл бұрын
I agree with this suggestion 👍🏽
@namAehT Жыл бұрын
Or print the later stages in different materials. This thing printed out of glass-reinforced nylon would probably be more robust than a drill gearbox through sheer cross sectional area alone.
@coledavidson5630 Жыл бұрын
@@namAehTyeah, except that fdm 3d prints shear easily. Unless the layers are melted together
@BrokenBuildings Жыл бұрын
One pretty easy and cheap way to increase strength around where bolts are mounted in 3d prints is to add metal washers imbedded into the print, it helps spread a lot of the load out across more distance and gives a strong metal back.
@Ironwright Жыл бұрын
Planetary gears need to run on a through shaft to a backing plate. By constraining the shaft on both sides you will reduce the lever action on the carrier plate. Longer gears will just make this worse. as you will be increasing the lever length.
@asid61 Жыл бұрын
A double sided carrier near the output might help. Also as others have said, longer planets and even potentially a larger pitch ring gear/planets.
@reinierwelgemoed8171 Жыл бұрын
You can get those same battery connectors in "anti-spark". They have a built in resistor. Saves the arc damage on the connector and is less stressful to the ESC. I love these gearboxes. Awesome work.
@conorstewart2214 Жыл бұрын
It would be interesting to see it printed in nylon, preferably with glass or carbon fibre to reinforce it. Also it should be printed at 100 % infill. With the nylon you could test it just after printing but also after letting it absorb moisture from the air to see which is stronger. Heat set inserts are great, I am surprised they aren’t more common, they are so easy to insert and they are pretty strong, but it seems a lot of people don’t like them or are scared of using them. I was printing the matterhackers E3D V6 mount and found one that didn’t use threaded inserts and it required very specific nut shapes and sizes to insert and specific length bolts, whereas the matterhackers one that needed heat set inserts was very easy to put together and just used the inserts I had anyway.
@pietercronje6938 11 ай бұрын
This was so taking me back to my previous work as a mechanic for Barloworld, South Africa's CAT dealer. We have had so many failures in planetary systems that i cannot even tell you how many. I think that you are on the right track with identifying the output carrier as your weakest member so trt printing it in the strongest material that you have available. This will unfortunately lead to the next weakest item failing and so on. The idea here is to place a limit on the amount of torque that you want to have go through your planetary reduction drive as you can keep over engineering all the items ad infinitum and never reach a point where you are satisficed. If you look at your different CAT machines using planetary reductions, they are all designed and sold in different size and application markets, from handyman to relocating mountains. I really hope this helps as I am just a retired earthmoving mechanic on medical pension. Pieter (Pete)
@tomb7704 Жыл бұрын
Cool video. I think one of the easiest improvements is turning the carrier into a cage like design so the planets shaft is supported on both sides.
@kylewall9107 Жыл бұрын
One thing I noticed was that the planet gears spun concerning the carrier. This is indicating that there is too much force on one side of the planet gear for the carrier to handle. Putting another carrier on the other side would not induce a force on that side to help but may distribute the offset across the planets. Further, there should be enough room between the planet gears for the carriers on either side of the planet gears to be connected. The force could then be given to the planet gears from carriers on both sides and reduce the incorrectness of the torques on the planet gears.
@dexternavejar8365 Жыл бұрын
I haven’t gone through all your videos so I’m sure you’ve done this before, but I would love to see you do pre-test analysis to predict failure. I think it would be a great learning experience to see how systems are modeled and remodeled iteratively to match empirical or experimental results. Great video, Mike!
@Dangineering Жыл бұрын
With my carriers I have a screw that acts as a center shaft through the carrier and this way there is some metal reinforcement at the core of the axle that goes all the way through the part.
@Tritiumfusion Жыл бұрын
make that gears and carriers longer the more torque that are applied to them. First stage 1x, second stage 1.4x, 3rd is 2.2x, last of the four is 5x long
@rbstudiobutcher 4 ай бұрын
Very entertaining thank you. I’m learning so much from your projects. On strength in plastics, it’s generally good practice to design out stress with radii and chamfers, especially for structural loading. The bigger the radius, the better distribution and transfer of stresses - minimise notch fractures.
@FilmFactry Жыл бұрын
I've always wondered if you could make an plastic 3D print stronger by leaving vias in the infill and pouring an epoxy resin as used in fiberglass. Think of how rebar is embedded in concrete to give it extra strength.
@YOGURT1 Жыл бұрын
The fact that you didn't already print it at 100% infill is a lol moment. Great video!!!
@graealex Жыл бұрын
100% infill with Nylon or Nylon with carbon fiber content. Or with more classical materials: print a positive on the resin printer, make a negative from silicone, and cast a positive from polyurethane resin.
@colinsmith6340 Жыл бұрын
You should make the carriers double sided. Run a web up between each gear so its inside and outside are still clearanced, but support the gears at each end. That should help.
@sirslowey Жыл бұрын
You know how I know you're a good person? Step files. Bravo.
@BobWidlefish Жыл бұрын
This was excellent, thank you! Can you link your motor and ESC in the description along with the design? I think I may want to follow along at home, so to speak. :)
@TheRealSamPrentice Жыл бұрын
Great video, i've been looking at those motors for a few months now and wondering what the performance would be like,. When printing gears I found that strength is usually won by the layer lines over infill, so for the smaller gears maybe a 12 layer line. Polymaker Tough PC Filament we've used one a couple of the robot builds, on gearing especially. There is an annealing process with that filament too, so pop it in the oven for a few hours which will aid on the compounds to become stronger. Love the video !
@jpjay1584 8 ай бұрын
yup. heat treat the prints will help with max strength. there are some test videos online.
@TheRealSamPrentice 8 ай бұрын
@@jpjay1584 thanks for the reply a year later lol :)
@bustean Жыл бұрын
As far as improving the planet carrier, one thing that can be learned from impact drivers is that they capture the planet gear pin on both sides; What that means is that there is a second plate with a hole in the middle that restricts the movement on the ends of the pins, stopping them from twisting side to side. Usually the carrier is made from a single solid piece, which should not too difficult to 3d print.
@dan2800 Жыл бұрын
Would be interesting to see how machined aluminum with this design would hold up or some different metal
@GeomancerHT Жыл бұрын
The spark connecting the batteries is a classic in the solar / off-grid community, you should add a switch and do the plugging while the switch is off, to limit the sparks.
@agoffgrid640 Жыл бұрын
PLA is wayyyy stronger then the stigma everyone gives it. When I design my firearms I do so with bargain bin pla in mind and it always surprises people to learn that, especially that I'm make a 50 caliber rifle with it (on the top end of my designs).
@ronnetgrazer362 Жыл бұрын
Happy to hear that, because that's what I've been stocking up on lately, I've got all the colors now : / TPU in the 75D range like ninjatek's armadillo seems like a good alternative to use on budget printers, when PLA doesn't cut it. Although gears probably need relatively heat resistant filament, especially when operating non stop, so budget printers could never deliver the optimal printed plastic gearbox.
@graealex Жыл бұрын
PLA has one major drawback, and that is its susceptibility to heat.
@Dangineering Жыл бұрын
@@graealex Yeah Its honestly ideal in most situations, but you get it even warm and its useless. (not good when using high power BLDC motors)
@phantomhck Жыл бұрын
Heat set threaded inserts changed my life and the way I design prototypes man. Also, barrier to entry for CNC milling is pretty low. (Relatively, I have a CNC machine shop already) You can get a genmitsu pro for pretty cheap and with some mods to the backlash nuts it will most certainly machine aluminum. You can also solid print the bearing backings combined with the housing to give extra support to the pinions.
@javqui410 11 ай бұрын
if you add some potential energy, then convert to kinetic energy to the dumbbell (by dropping it in to your sensor), you will have a complete different measurement. That's what are you doing when you measure the torque output with additional kinetic energy. Either way, there is no plastic gear match for this motor, unless you make them very large and introduce even more problems. Plastic gears will get destroyed with or without stored kinetic energy.
@ernie5229 Жыл бұрын
I like the gear salad at the end!
@frjhracing Жыл бұрын
head on over to the torque test channel where they show Milwaukee's impact planetary drive system. They recent faced controversy where they redesigned the drive to a single shear support for the planets - and the mechanism kept breaking out of the box. You want to go with the tried and true double-sheer design which encases the planets and has bearings on both sides. This would make your system much longer per gear set, but will solve the carrier breakage.
@chadwinter6873 4 ай бұрын
Love your videos! Looks like there may have been some layer adhesion issues, no? Maybe print slower, with slightly higher temp. Or basically, don’t rush the print. Idk. You the man bro!
@FreeOfFantasy Жыл бұрын
If I see that right you have the gears planet gears only attached to the carrier at one point each. I bet a lower ring connecting the gears on the other side could take a lot of those twisting forces. Also a shaft straight through all the stages to help align them could do a lot.
@dollarbutt Жыл бұрын
Agreed on last part. Stick a sanded 8mm rod down a hollow print with epoxy/glue
@ObsessiveEngineering Жыл бұрын
Awesome video (as usual). I'd be interested to see pure Nylon parts if your 3D printering skills & setup are good enough for it (warping might be difficult to tame). It's surprisingly rigid at high infill and basically indestructible (it will have to fail through deformation, instead of snapping/breaking). Nylon-CF would also be worth a go, but it's pretty abrasive so even if the gears work, they would probably wear down over time.
@lio1234234 Жыл бұрын
If it's all nylon-CF then the higher abrasion shouldn't make much of a difference. Also nylon is excellent purely for its self lubricating properties!
@prabhuprakashjoseph8060 Жыл бұрын
An aluminium plate sandwiched between the planets hub, which also serves as the mount for planets.
@easycheesy187 11 ай бұрын
The planetary gears are tearing out of their mounts, because the tolerances are loose enough to induce end-climb. Add a backing plate for the far-end of each gear shaft, or switch to double-helical teeth, to minimize the end-climb, and compensate for the wide tolerance. And if you are using lubrication, add a center-channel valley. Experimenting with its depth will allow you to "leverage" some of the hydraulic lock to your benefit, as it effectively reduces the tolerance problem that is causing end-climb.
@pizzamonkey7801 Жыл бұрын
5:36 now that was epic 😂
@RonPaul20082012 10 ай бұрын
The carrier will be really strong if you use bolts that go into the shafts to compress the layers. The bearings should go on the plastic carrier's shafts, inside the shafts is the bolt which compresses every layer from the bottom of the carrier to the top of the shaft. Bearings aren't really necessary if you use lubrication. I made a much smaller 64:1 planetary gear box that uses no bearings. The carriers are practically indestructible.
@waynefilkins8394 9 ай бұрын
PETG is less brittle. They say PLA is "stronger" but for gears PETG may work better. Also you want to grease the gears I think. pretty sure that's how they make gear boxes usually they put a bunch of grease in there. The PETG is higher temp too so if it gets hot in there (especially without grease) that would work better.
@novadea1643 Жыл бұрын
You could have the planet gears supported from both sides by having a bottom layer with large enough hole for the output shaft of the previous stage to pass through into the next stage, should help against the twisting load on the planet gears.
@wotdescriptions 5 ай бұрын
cool. you most consider higher module for second and third stage
@sm9300 Жыл бұрын
One word, genius 👏 Very interested to see how this plays out!
@NicholasRehm Жыл бұрын
I also recently started using those heat set threaded inserts… don’t know why it took me so long lol
@holikarbon Жыл бұрын
Thank you for CAD and STL files.
@regoso8580 Жыл бұрын
if your going to do anything in resin id advise you to use Siraya Tech Blu-Tough Resin. its really really strong
@lio1234234 Жыл бұрын
If you go for 100% infill, go for all walls instead of all infill. It's stronger
@dollarbutt Жыл бұрын
Aka 100% concentric pattern. Is this the strongest? I heard somewhere that 90/95% cubic/gyroid (depending on force direction) was the strongest.
@lio1234234 Жыл бұрын
@@dollarbutt typically not from what I've heard, since there's a higher likelihood that the layers from the concentric pattern are placed directly on one another which means it's more likely to be stronger between layers.
@lio1234234 Жыл бұрын
@@dollarbutt When you get to 100% filled, force direction means little to nothing. At that point it's all about how well the layers bond to each other. Else I would totally agree with you
@NUeB_net Жыл бұрын
… and maybe some over-extrusion to fill the last tiny gaps remaining, too.
@DKFX1 Жыл бұрын
Aligned Rectilinear infill is the strongest of all.
@oakld 9 ай бұрын
Nice experiments. Though I have a little comment - you shouldn't compare loads you've measured with rated output loads (like Smart car). What you got is a peak, but for a more meaningful results you'd need to keep the parts under the load for some time and step-by-step increase the load until a breaking point. Of course, that is more difficult test-setup, since you'd need transfer from rotation to the force gauge. And another parameter would be introduced - speed. You will get different torques for different speeds, which would mean to a lot more experiments needed. But don't take it as criticism, it's great when people "play" like this and those test results have some rough results too.
@memyselfandI0123 Жыл бұрын
Amazing design. I have to get a 3d printer! This would be so much fun
@kevino6670 Жыл бұрын
This is a cool video, what I learned is I really need a quick 3d printer.
@OERYV Жыл бұрын
How about having bored holes in the middle of the sun gear strengthen by thread rods. Like this symbol Ꙫ , with them side by side. Or even better, use some FHCS opposing each other screw in and held by nuts on each end. Hence, externally bind the 3d print layers together.
@robertoguerra5375 Жыл бұрын
Great experiment :D Maybe the carrier could be thicker and the planet could be thinner… also choose a planetary with fewer teeth overall (to make each tooth bigger)… maybe the carrier axle should be a metal square tube or a pipe with threaded holes, so you can secure the carrier. Finally, I have read that “annealing” does wonders in layer-to-layer resistance.
@DKFX1 Жыл бұрын
Great video. You want to select the aligned rectilinear/linear infill at 100% for best performance.
@DKFX1 Жыл бұрын
In Cura you have to manually adjust the line angle by typing the angles in settings.
@yoshums7970 Жыл бұрын
Thin piece of steel sheet on both sides of the carrier, with 100% infill 3D-printed carrier sandwiched in the middle. It wouldn't prevent warping completely, but it's likely the cheapest way to get more torque out of this thing.
@KaleDeatherage Жыл бұрын
Im extremely excited for the next video!
@BloodyMobile Жыл бұрын
* gentle words or persuasion * ahhh, one of my people :D
@jpjay1584 8 ай бұрын
heat treat the prints and use herringbone gears. that should increase the strength significantly.
@semtex2987 Жыл бұрын
perhaps using heringbone gears for more even torque transmission?
@trentsaunders3351 Жыл бұрын
To measure torque, would have been easier to set it up as a winch lifting an adjustable/increasing weight? You could then also calculate speed at various loads (ie power). That way you are measuring the torque in motion rather than measuring an impact?
@RicardoLameiro Жыл бұрын
Nice project! You could try to print the planet carriers with PLA Carbon, also 100% infill seems a good idea. Bump the extrusion temp as much as possible for the material. Usually it makes the bonds stronger.
@magicstew45 Жыл бұрын
As well as salt annealing forsure
@Suzuki_Hiakura Жыл бұрын
perhaps having more and smaller planetary gears would help more? Rather tired and thinking about how a bearing uses balls and such to minimize the contact to reduce friction considerably, so it could be that my thinking on the suggestion is flawed from the beginning, not counting the being tired portion
@chocoking2103 Жыл бұрын
you can print the planet carrier out of a filament that uoy can turn into metal or just not
@mr.commonsense Жыл бұрын
Try metal by ordering parts. Maybe a company that makes cnc products. I found this video today and subscribed half way in. 10/10 ❤
@jocrp6 Жыл бұрын
Got to cage planet gears.
@gheed4348 Жыл бұрын
If you are able, you could try filaments with fiberglass reinforcing for the carrier, should take a bit more abuse.
@renegadethesandwing02050 Жыл бұрын
I wonder how much stronger the gearbox would be having each of the components machined rather than 3D printed yes I understand that is beyond the point of the video but I'm just curious
@koopdi Жыл бұрын
Electroplating the parts would be an interesting experiment. Would it increase the peak torque? Would it extend operating life through increased heat dissipation?
@l0I0I0I0 Жыл бұрын
Just wondering, have you considered magnet driven gears? I don't know how long the magnets will last but at higher torques it will just slip preventing breakage I and increasing the life of the motor. I remember seeing a 100 ton piston snap and threw hardware at the operators. Having a slip mechanism could have prevented breakage, replacement cost, and potentially of saved a life or injury, not to mention longevity of the part as no gears touch. Granted regular magnets will not do 100 tons, 😂.
@SuperMakeSomething Жыл бұрын
Great video! Are you noticing a lot of part shrinkage when the resin cures? For resin parts I have made in the past, I have noticed that mine can shrink up to ~5% depending on the resin, so I mostly stick to PLA for “functional” prints. If you are seeing shrinkage, how do you deal with this? Are you pre-scaling the size of the parts to be slightly bigger or are the tolerances in this design loose enough that this change doesn’t matter much? Thanks!
@michaelrechtin Жыл бұрын
I haven’t really had shrinkage problems with the Siraya Tech nylon black resin. I typically just use the horizontal expansion setting in the slicer to get the fit I want between parts
@SuperMakeSomething Жыл бұрын
@@michaelrechtin Nice! Thanks for the info. I will pick some up and try this out.
@tylerf660 Жыл бұрын
What if you print the ring and planets at the same time so you could use heringbone gears (the ones that have v shape) for the support material you could use PVA so once first stage is done you can use water to remove the PVA
@BenKDesigns Жыл бұрын
I feel like laser-cutting metal bits for the carriers might be your best bet. Or maybe ABS at 100% infill?
@MicheleHjorleifsson 2 ай бұрын
try annealing the parts, that will give you another 20-30% strength. also PETG-CF will give just a lil and not shear
@germimonte Жыл бұрын
maybe 2 planet carriers? like a support ring on the other end
@janbutz5169 Жыл бұрын
this gives me ideas
@BooBar2521 Жыл бұрын
Maybe you should print the planet carrier 180° turned to the side.
@schizophrenicgaming365 Жыл бұрын
try Markforged Onyx Nylon if you can get your hands on some
@woodrunner51 Жыл бұрын
Amazing design!
@TheDayssincethedoor Жыл бұрын
Can you please update the parts list to include the new motor?
@Ollie9T7 Жыл бұрын
If the gear ratio increases by 4 at each stage then each stage should be make stronger to deal with the torque increase. Id start by testing a single stage to see how much torque it can withstand and then create a ratio of torque to part metrics, you will then now how much stronger each section needs to be to deal with the forces it is experiencing.
@gamersplaygroundliquidm3th526 10 ай бұрын
I was thinking of making a simulator setup for my pc and driving and flying games wonder if this might work on moving the seat platform , hmm?
@brandonhicks7549 Жыл бұрын
Any way to put the plat gears in double-shear, with a second plate on the far side
@leifmessinger Жыл бұрын
First time using heat set inserts 🤨 What do all the other wood screw holes use
@freakinccdevilleiv380 Жыл бұрын
Excellent
@NickNam3 Жыл бұрын
Impressive!
@HM-Projects Жыл бұрын
100% infill would be interesting, also sintered metal filament planetary gearbox ?
@TheBlaser55 10 ай бұрын
With that power it would be nice to see how to biuld and test a shear pin......
@sigcat5975 Жыл бұрын
Micheal, great video! One thing about the audio recording tho, your clock cld be heard in the background haha it drove me crazy trying to find a clock in my room that is ticking but apparently its yours (,;
@Novers Жыл бұрын
I want to see this in a bigger gear size to see if that would hold up better
@miggyfixx6418 Жыл бұрын
Can you run it backwards to make a speed multiplier with the high torque motor?
@RinksRides Жыл бұрын
3d print the carriers out of A2.. should be good up to about 400 ftlb. Sick gear box tho. Props.
@ericanderson7570 2 ай бұрын
I'd love to scale up the design for more beefiness. With only a STEP, I'm thinking my options are just a blunt overall SCALE of the whole thing. Not sure that's ideal. Don't suppose this is Fusion 360....
@petrhafan1265 Жыл бұрын
Thanks Bruu
@Javii96 Жыл бұрын
It looks like your load cell wasn’t very close to 90 degrees from the output lever. You probably put out more torque than you calculated unless you accounted for this offset angle with math.
@l0I0I0I0 Жыл бұрын
Love it. Just subscribed. TY for sharing.
@TheRedstonelabz1 Жыл бұрын
If you make the sun gear axle a little longer you can put a plate on both sides of the planetsmaking it a lot harder for the planet axles to break.
@PatrykMCMania Жыл бұрын
Mace it bigger about the size of that new motor like diameter wise im sure it would be able to do better then haha, cool video btw
@anon_y_mousse Жыл бұрын
I'd love see how this would fare if you machined the parts out of steel. For that matter, since you have the 3D printed parts already, maybe make a mold and cast out of aluminum and see how much force it could take.
@martinandersen7312 Жыл бұрын
The last gears needs to be of the strongest material
@ianrafaeltoh7679 Жыл бұрын
You forgot the top black brace thingy so the gearbox lifted up and may have affected the output torque.
@pusnirizda5481 Жыл бұрын
Nice video, thanks
@Charles-jy6nx Жыл бұрын
Did any one suggest using using Taulman Alloy 910? It is a nylon mix that is heavy duty.
@Cheesecannon25 Жыл бұрын
Maybe longer gears at the higher torque sections?
@PhG1961 Жыл бұрын
Very impressive !
@achillesmj 5 ай бұрын
I've decided to print it out and try. Unfortunately in the outer ring, teeth are too close to the planet gears' teeth which causes problems with assembly and the whole planet gear rotates unnaturally and with great resistance. Planet gears with sun gear works well and there is some distance in CAD files between them. Have you faced a similar issue? Do you have other corrected or adjusted 3D files? Thank you for help, very nice project.