It Worked Stunningly Well - Gear Teeth Repair With A Candle!
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- Опубликовано: 2 июл 2022
- In this video, I'll show a tricky way how to restore teeth on a broken gear using a candle. After repair, the gear will be as strong and durable as a new one.
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From 8:00 on, you should show us how to use the repaired gear to make a mold and then casting a complete replica gear from epoxy/cement.
The repaired gear will have a non-uniform density, while a cast replica would be more uniform in strength and appearance.
Plus, having a mold for the gear available allows multiple copies to be made, in the unlikely event of failure.
Damn good idea
Yes 👍 👍 👍 👍
I hadn’t considered casting a mold of the repaired gear but that’s actually a really good idea. Especially since as you said, the two different materials aren’t going to be uniformly powerful, and thus may simply result in the repaired portion breaking again.
I'm glad I saw this reply cuz it has to do with my initial thought and idea after watching this whole video... Even if you had all the tools and equipment necessary to completely this job, wouldn't it jus be easier and much more time and money effective to jus buy a new gear...??
@@adio2877 ok 👍 👌 🙆♀️
The end where you show off the finished repair would have been SIGNIFICANTLY more impressive if you had shown us the gear being put back into operation again with the other gears it was previously working with.
I agree. The durability of the repair is the most important thing, really.
There isn't a operation, it's a broken gear just for this video.
Not really a repair if it doesn't hold up during operation.
@@xXSquankyXx But it is a youtube video.
@@Andreeee75 So?
Interesting! I took a similar approach on my 4WD actuator. 2 sprockets sheared off and instead of buying even a used actuator for $300 i just started off as you did, but put 2 wire anchors in each sprocket before using CA Glue to fill the entire gap, then used a file to reshape the section by hand. It’s been working for the last 5 years without problems
I like the addition of wire anchors!
That was a very clever repair. I wouldn’t have ever thought of that. Pretty cool to see it done👍🙂
Congratulations! You made a broken gear whole again. Now let's see if it works without disintegrating when you reinstall that gear to whatever machine it came from.
I agree that we need a test however I know epoxy is incredibly strong so depending on the gear itself if it adhered properly that section might just be the strongest part.... hopefully it's for something not to intense
@@bigteo90 The epoxy wont be what breaks, most likely the connection to the old plastic. Also this fix wont work if this gear see much load at all. And it’ll be horribly unbalanced if it needs to spin fast. For this much effort it’s better to buy a new gear or 3D print a replacement if available
Somethings just aren’t worth the effort lol
Most of these videos never show how it works after repair
Feels like it's gonna snap just by looking at it
Looks good, we saw enough angles. Great repair, didn't find out if it was strong enough!
It should be, the plastic looked pretty cheap and he used a cement/epoxy mix, so it should be stronger than the rest of the gear. Those holes he drilled in the plastic looked like it was to give his epoxy mix some extra surface to grab onto.
@@sabastianleisek396 I agree, the only thing he could have done to add more strength is to melt Steel wire across the the broken section so I has more contacts between original part and new epoxy but overall well done.
@@bfflorida2311 _"... add more strength is to melt Steel wire across the the broken section..."_
I think he could have used that wax method to build a complete mold if he wanted to use the original plastic resin instead of epoxy.
Consider using chopped fiberglass added to the epoxy instead of cement
"Great repair, didn't find out if it actually did anything"
Then why did you say it's great?
For those that aren't watching the whole video, the repair is NOT made of wax, he uses was to cast the negative, then uses that to cast the repair in epoxy.
Several comments mention that a wax repair won't hold, they didn't pay attention to the whole video. 4:49
They did not pay attention because he click baited. The title clearly says he use candle for the repair
@@sdy.deathcall9608 no actully not clickbait as a candle was used in the process. It would be clickbait if there was a girl in bikini and or he took the broken gear then throws it into butter, rise and whip cream and ketchup and mentoes then bake it in oven and then magically remove a new gear and gets millions of views from natures less intelec.
@@frikkiesmit327 😂🤣
Fun video, not practical in this case as the gear is 2 dollars lol 😂 but what if it wasn't. I have had to do similar before on RC cars.
wax repair wont hold
WOOOOO!!! That was smooth. Brilliant idea and it worked perfectly. Thank you for sharing. 👍👍👍
You should have added more material in back of the gear teeth as the patch will be pulling on what little material was remaining. Thus the theeth patch can tear off easily as the previous damage shows a lot of force is applied while in use.
Yeah, judging by the initial damage this gear is meshed with a metal gear. I don't think this will last a minute under load.
Totally agree, this patch won't last long
If I was really desperate for this part I would use the repaired one as a sample and cast a aluminium one
He should have made a sand mould from it and cast it in aluminium
@@barryadams243 A sand mold would probably leave a surface finish on the teeth that would need a lot of clean up, but I can't see why he couldn't do the part as an open topped mold in plaster. It's not a process I've tried, but apparently, with a little trial and error, the surface finish achievable with plaster cast moulds and alloy can be excellent.
Nice process. A friend did something similar as few years ago to be able to make sacrificial "high/low speed" double gears for his mini milling machine. He rebuilt a gear pretty much as you did, made a mold of that gear, then used the mold to cast the centre part of that to make a 3 piece mold in aluminium. Whenever he kills a sacrificial gear now, he packs the mold with glass fibre filler, clamps it all together hard in his vice so that the filler get's pushed right to the tips of all the teeth, then next day he has a new gear that just needs the centre hole drilling/reaming through, and 3 faces skimming on his lathe.
Considering the OEM replacement gears cost over £30 each (About 35 USD at todays exchange rate), it's since worked out significantly cheaper than buying genuine gears every time he crashes his mill and spreads teeth all over the inside of it's head. :D
What do you mean by sacrificial gear? A plastic gear that shears off in an overload to keep the rest of the machine whole?
Then £30 for a spare part is incredibly expensive. Even if you never get the load capacity and precision in such a replica of course as good as the original, certainly a super project!
@@uli9643 I think they're "Sacrificial gears" only in the sense that they're the weakest link that's always the first thing to break in that mill. They're a fiddly job to swap though (IIRC it's one of the rebranded SIEG machines), so personally I'd have converted it to run a toothed belt drive long ago, but he says so much of the head design looks "Under engineered" that he'd be worried about turning something a lot more expensive into the weakest point.
He also pointed out that it's such a lightweight mill that there's little point in re engineering the drive train to be stronger, as it still wouldn't be able to make heavier cuts without chattering.
@@Reman1975 Very interesting! I wish I had more time for such things, too.
Often the allover stiffness of the machine is much more important than the drivetrain, I think. So, maybe an improvement of the drivetrain would lead to other issues when making heavier cuts. So, I kind of understand your friend's approach not to try to hard on that. 😅
Have a nice sunday!
"Everytime he crashes the mill!"
WTF? This happens regularly???
@@deanpatterson9036 by "Crash" I mean more along the line of "Pushing a distinctly hobby grade machine beyond what it's capable of doing". Things like trying to use a 25mm waisted shank drill bit to hog out a hole in 1" steel plate, or making a 4" DIY fly cutter then trying to clean up an uneven saw cut surface on a block of steel in one go by hitting it with a 100 thou cut !....... It's just easier to say "Crashed his mill". :D
He's in essence a very competent welder/fabricator who just happens to also have a little mill and a lathe that he plays with to make his own hobby projects. He'll get an idea for something off the internet and decide he desperately NEEDS to have a go at making one. This is why he also has things like his little propene alloy smelting furnace, a 3d printer, all the stuff to anodize alloy, and one of those cheapo desktop CNC engravers/"Milling machines" (The kind that are fine for milling, but only if you just want to mill small pieces of plastic or wood ! :D.). It doesn't help that he's not the more mechanically sympathetic person in the world, and when stressed by things going wrong, he can also get pretty impatient. I'm not saying he can't do good work when he put's his mind to it though (He's made some really nice alloy parts for his motorbikes over the years ), but it does seem that the quality of what he's machining is quite dependant on his mood at the time.
On the plus side, he's a handy guy to know if you ever need bits of carbide to make odd ball lathe tools.... he tends to always have a few broken end mills kicking about. :D
Excellent ! The vid gives a great example for other repairs in plastic I can utilise.Thank you for uploading.
Nicely done! Great repair 👍🏼🤩❤️
I would suggest adding some kind of fibre strands in the mix will make it stronger.
Totally agree, and a bit of black dye to really finish it.
He added that "cement" powder. Dunno , maybe for strength? Never seen anyone mix in powder into resin.
@@noelstephenryan4837 a full RPM test will fail. 3d print or buy another cog. It was interesting though
If plastic gear teeth broke how can candle wax be strong enough for the job?
@@robertspringer9477 See the video again. He used epoxy
Wow!! I thought you would use 3d printing...but this makes more sense and is a great repair work...kudos👏
Very good demonstration & video overall. Especially if the broken part is irreplaceable/difficult to find or too costly to replace etc.
I would really like to see the repaired part function after the work was completed.
I would have liked to have seen it reinstalled and functioning also.
3D printing would have worked too
Probable one of the most useful videos on RUclips 😎👍.
Really brilliant work, dude! Nicely done!!! 😃
Stay safe there with your family! 🖖😊
iamalso with you ji
One of the best things about youtube, is that if you think an idea is funny or worth trying out, there'll always be someone out there somewhere that you can share it with & that'll get what you're trying to do
Hands down the best “build” video I seen in a long while.
Looks surprisingly balanced. Nice work!
Very nice repair and I am sure equally as strong too. If there is a will, there is always a way... Thumbs Up!
Equally as strong? Candle wax would fall apart the second they put a load on that gear, there's a reason you don't see the gear in action once it's "fixed"
@@zakabog Did you watch the video? Candlewax was used for the mold, the new teeth are epoxy resin.
Though I still doubt this will hold up in actual use.
One of the best videos you made to date! Awesome solution. I hope I remember this when I need it!
This is by far the most basic and most clever repair video i have ever seen. Liked and subscribed!
Thank you for documenting this process so well
Your process and the result is excellent. If I could offer a suggestion, it would be that you should have added much more material on the inside to provide more of an anchor for the new teeth. The thin section at the root of the new teeth is likely not going to last depending on how much torque is being transmitted through the gear.
People working with molds at home, usually end up having to break the mold after using it for casting.
3D printing from Nylon could be a better approach.
@@oilybrakes 3000 for a 3d machine for a gear. no thanks
@Edward Elizabeth Hitler So he needs better raw materials or some sort of additive to the concoction he used. The idea is solid however.
Different material and extra thickness may make the gear off balance, which may be an issue if it would rotate fast.
@@rafalmag That looks like it bolts on three places and probably not a fast gear where balance might be a big issue.
I enjoyed watching it. For many who cannot afford a 3D printer ( me included) it’s a great display of creativity, knowledge, and skills. Good job. I’m subscribing. And using the Roman Gladiator hand sign for life. 😊
Well done!!!. Really like the thought and creativity involved.
Amazing way to repair broken stuff 😍 thanks for sharing
Great craftsmanship! Love the use of very basic tools and materials👏 bravo!
Cool, but you never showed it actually working.
Absolutely AMAZING ! Intelligence, Imagination, materials... !
One of the few tip things from RUclips that I'll keep in my memory. 👍
Não sei se a resistência no local ficou a mesma do restante da peça, mas a ideia é genial. Parabéns!!
Kkkkkkk
Epoxy resin once cured is way harder than regular plastic ( I assume that is). Excellent reconstruction technique. Thank you.
Very Informative, helpful and Educational video! Thx for the tutorial man!
I'm going to have to remember this for emergency repairs on my boat, thanks for sharing this.
Heck yeah, as long as that epoxy is strong enough and bonded well enough that should work!
I would be totally convinced seeing it in actual operation on the equipment it was initially used for. If this original part suffered this type of damage I doubt if this patch would hold up.
It's a great get you by diring this shit inflation
He won't be using the gear he fixed. He will be using the revenue from this video to buy a new gear.
Great concept that can be applied to lots of things. Thanks for sharing
It would be good to see the repaired part working on the item it is from. A durability test would be good. Nice work.
Excelente proyecto muy bien desarrollado y mejor ejecutado, esa rueda dentada quedó cómo nueva, gracias por compartir tanta información y conocimientos, un saludo cordial y por supuesto un gran like desde Narón (Galicia) 🔝
Finally a video that has some content that could actually work!
That's brilliant. Nice to know it could be a DIY if needed.
Amazing fix. Thanks for calm music at a sane level.
Great approach, but how well will it handle the applied force and load? As the original break implies a seemingly strong torque/load application.
All aside, nice video and editing job.
That’s what I was thinking as well.
That's why he made the 4 holes so the resin had anchors
@@Luciphers_Workshop So you think that the epoxy is reinforce by these holes? Interesting🤔
@@antonionunez3759 it anchors, it grips the plastic inside and out
Considering how easily he carved that material. It's only good for very weak applications
This was satisfying to watch. Thanks
I can dig that. That's pretty cool man!
Good work. Now make a mould of the whole thing before it breaks again. It is happens once, it will happen again. A full resin gear.
May as well cast a new one out of metal!
EDIT: Please read the replies, I know it's not wax, there are other concerns on why the repair would not be effective (assuming that damage was real and not staged for the video)
---
The repair would fall apart as soon as load is applied, but it could be used to make a mold to cast a new full gear
Exactly
Honestly it depends on what the gear is used for, if it is used for something that needs a lot of torque it will most definitely fall apart.
@@gactalaboratories1329 all gears are used to transmit force (torque and speed). I don't recall any gears made out of wax for that reason. I can't think of any use where this will hold up for even a few months. I could picture the gear coming to stop at wax part and then when it turns back on, the wax teeth would just break off (with lack of momentum to get system to start turning)
@@SoulDelSol the teeth aren’t wax. They’re an epoxy composite.
@@davidktd oh I must've missed that part. I also saw a critique video of this that referred to teeth as wax. That changes things
Brilliant! I wish I had a gear like this to repair 😁
Forget the negative comments, I'm a dental technician, in my opinion you did the best ,you're a genius, thanks for the info.
Nice work. The repaired gear would make an excellent pattern for a 3D copy with carbon fibre, or a brass moulding.
completely ridiculous. It's true that I break cogwheels every day. I certainly won't bother doing all that, I order the spare part on Amazon and that's it.
@@louisguerin8513 Some people, like myself, really enjoy fixing things, because, we can!
Nice technique and skills.
No epoxy resin I've came across would adhere to thermoplastic
In a mechanical bond it adheres just as well to thermoplastic as it does to other types of (fully cured) polymers (except on silicones, polyurethane, rubbers and teflon, technically) and all other non porous, non absorbing materials like metal, glass and so on.
Epoxy makes a chemical bond to uncured epoxy making it one material instead of a composite ... and stick really well to porous and absorbing materials like wood or prepped concrete.
Everything else is a matter of preparing the smooth surface by scratching, sanding, making holes or anchors to get the best possible mechanical bond (more irregular surface area to grab on to).
👍🏻
Devon Plastic Welder epoxy might but he also drilled those small holes in it to help lock it in. This doesn't look to be for a high-speed application, and also might be a part with hardly any force against the gear.
Well done and good to see this working with a candle.
I agree about the full mould to make new full replica gears, but life gets complicated, depending on the tolerence required for the gears.
A full cast can be difficult to release and softer moulding materials are not good at very accurate shapes, which indicates a multi-part mould with locator pins.
Then the mould can be a filled resin with fibres as well as other additives as required to make a much stronger gear, but again more complexity and multi-coating / casting if adding different layer properties.
I hope that this gear works OK, but the bonding to the original gear may be the problem due to the plastics surface energy. The flaming will have helped a lot, but I had a thought that some pins (or screws) through the back could also help. Luckily, in some ways, it is quite a long repair and therefore a longer shear area for the load transfer through the bond.
I first hit these problems with higher capacity paper shredders, that include plastic gears which shear, but are custom parts that are not available as spares, but appear to provide a limit in the drivetrain, although it would be better to sense the motor and fita cutout! But that would be more expensive in both gears and circuitry,
Thank you for this demonstration, can be useful in future. 👍
Ive been repairing equipment a long time. I have rebuilt plastic and metal parts. There are great epoxy resins out there....some even get hot while curing which helps them bond to their substrate. As many stated, we don't know what this gears purpose is. The damaged area appears to have been caused by another round gear, (watch the first time he shows the damage) when this gear locked up, the gear it meshes with continued rotating causing the half round depression. This gear that was repaired was locked up, if it were the drive gear, more teeth would have been torn off and there would not be a half round depression. Rather than being jagged all over, the depression is more smooth and half round indicating a low ,"shore hardness". The scrapes in the depression are from pieces that were torn off and rubbed against itself, showing again it's low shore hardness. The tengential force applied to the teeth is the greatest force in this application or the gear would be more solid. Perhaps being light duty is how it protects the machine from jams. The shear resistance of the epoxy against tangential loads would be even greater than it's resistance to radial forces. So based on what we do know, this repair will work just fine, and if it fails it will be because once again the machine gets jammed. If anything the epoxy may be harder than the rest of the gear and if it jams it will just break off at each end of the epoxy, much like a good metal weld repair will break on the sides of the weld. Something to consider, My Dad warned me against making the repair too strong as it may cause something else to fail. GREAT VIDEO!!
Great video that encourages us non mechanics to be able to make any type of “repair.” While a replacement could be bought quickly, it’s the challenge that is more rewarding.
Ingenious, but surely ordering a new part would be the best bet.
Excellent video ! 👍
You didn't just show us "how to repair a gear"... You showed us how to repair a gear "with style"! :O)
interesting method. Just 3d print another cog
yup it's just gonna break again. no way it bonded as good as a whole gear would
That and he also showed us how to repair many other things. He did that subliminally.....
But how strong is it?
Will you trust it with high torque?
Depends on application
PARABENS , MARAVILHOSO , MUITA CRIATIVIDADE E COMPETENCIA .
Genius level repair
With a world so quick to buy something new, it's awesome there are still a few that actually repair
Yeah but there's a reason he didn't show that gear in use. What bonded the teeth to the gear? I'm betting those new teeth rip right off. Now had he used that gear to make a mold for a new gear made from an epoxy it might work
Great video! My only concern is about temperature changes during epoxy hardening, I think it can melt that paraffin mold
That’s your only concern?
You did a perfect repair nice work
Excelente vídeo. Obrigado por compartilhar seus conhecimentos.
Did it work well on the equipment when you reinstalled it?
Just my thoughts exactly, depending on what it came from,
I doubt very much if it will last very long at all it's only molded on to the original shit plastic otherwise it would not of broken in the first place 🤔🤔🤔🇦🇺
Can you explain a bit about what "white cement" is? White portland cement?
I wanna know too? Baking soda that is sometimes added to super glue?
I’d like to know what the white cement is as well.
White cement is made from raw materials containing little or no iron, chromium or manganese. The substances that give normal or conventional cement its gray in color.
@@darronsellick4202 So, why would you use that product specifically in this project?
Trabalho de Mestre! Parabéns!
Brilliant idea! I can see other types of applications that are similar. Strength could be greatly improved by the addition of either fiberglass or carbon fiber strands.
well that worked out nice. Did it work well when installed? Only thing I'd worry about is adhesion between the plastic and the epoxy, but it looks like there was quite a bit of surface area so should be fine.
Does white cement helps to make epoxy glue much more hardener ? Or its need only changing the color ?
Seems it would work well as a decoration piece. Where metallic gear teeth get broken, how a cement tooth can bear that pressure?
Great idea and interesting tutorial. Very clever repair.👍
Wow, outstanding and impressive work, congratulations.
Balance of the gear might be off if weight of added material for the new teeth is lighter or heavier. Usually gears need to be equal weight all around to avoid a wobble.
Depends on the rpm. Very Low rpm doesn't care that much about minor imbalance
Yeah looks way off.
This is really cool, I’m just wondering if this would be strong enough to still function as a gear? Either way though making a mold out of wax is always fun.
epoxy resin is stronger than that plastic gear itself
... well done, congrats!!!
I have to be honest, once I started watching this video, I couldn’t stop. Wow great job. Bet it works too, cause some of that epoxy they make ain’t no joke.👍
Thanks for that mate I think it’s cool how you repaired it sometimes parts just aren’t available off the counter anymore and it’s a case of do what you have to do 👍😃
Very clever repair. However, it's longevity will depend upon what stresses it is under, and from which direction. As another mentioned, there is not much but a few peg holes holding it on the hub itself. Reinforcing the back, where the peg holes are, will make it more durable. Great job !
This video would be more aptly named "Gear teeth repair with a candle, a dremel, some screws, play doh, a little copper tuna can holder, an empty tuna can, epoxy, a belt sander, ect ect ect....."
That is a beautiful repair.
Perfect, excellent idea
Nice idea but you must make a video of it operating as a fully loaded cantilevered teeth in a gear mesh
It might be a good idea to add a pigment to the epoxy, so that it's easier to tell the mold (wax) from the repair (epoxy). In this video they're both white. (it could be that it's actually easy to tell if you're actually doing it, I don't know. But having a sparkly blue gear would be cool.)
Pure genius!
Alot of folks hate ing on this. But I think its a great idea. Even if you just follow the process untill you can re mold a brand new cog. Very good. Thanks.
Great idea. I did something similar when the drive gear on my garage door opener stripped gears. It broke again in a few runs. I ordered a new gear and it broke right away. They sent me a replacement, it broke. In the end I replaced the opener. Most likely something else is going on.
Our garage door opener has a sacrificial nylon gear about that size. It is the weakest and cheapest part of the mechanism. The gear is easy to replace.
If a track gets twisted or something else makes the door too hard to move, the gear fails rather than something hard to replace.
If the nylon gear fails, make sure you fix the real problem before repairing or replacing the gear. It is a safety feature, like a fuse.
A spring loaded clutch like on a cordless drill is a much better solution for the customer. If the door gets jammed, the clutch will make a noise while preventing further damage. Then the customer can straighten out the track and lubricate the system.
Kinda like a torque limiter on a cordless drill!!!
@@fookingsog Thanks "torque limiter" were the words I was looking for.
Great work! Thank you for sharing
Genius idea..... thank you
Seriously well done
Thanks! I will use this candle wax technique for my friend’s 2000 hp drag car!
Excellent repair!
Absolutely amazing
That was surprising satisfying to watch 😁
That gear geared up to be great!
This is one of the best videos. Greetings.🎉🎉🎉🎉🎉❤
Colombia . excelente demostración . gracias