It Worked Stunningly Well - Gear Teeth Repair With A Candle!

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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[@richierich.1982]

Looks good, we saw enough angles. Great repair, didn't find out if it was strong enough!

[@sabastianleisek396]

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.

[@bfflorida2311]

​@@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.

[@awaitingthetrumpetcall4529]

@@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.

[@dinosaurus4189]

Consider using chopped fiberglass added to the epoxy instead of cement

[@lithuaniaball]

"Great repair, didn't find out if it actually did anything" Then why did you say it's great?

[@OPERATION_ARMED_CITIZEN]

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

[@j10001]

I like the addition of wire anchors!

[@danc2014]

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.

[@js-wy8fg]

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.

[@iakatat2]

Totally agree, this patch won't last long

[@Aladinscave]

If I was really desperate for this part I would use the repaired one as a sample and cast a aluminium one

[@barryadams243]

He should have made a sand mould from it and cast it in aluminium

[@Reman1975]

@@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.

[@DJFlare84]

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.

[@tasmedic]

I agree. The durability of the repair is the most important thing, really.

[@Andreeee75]

There isn't a operation, it's a broken gear just for this video.

[@xXSquankyXx]

Not really a repair if it doesn't hold up during operation.

[@Andreeee75]

@@xXSquankyXx But it is a youtube video.

[@DJFlare84]

@@Andreeee75 So?

[@Reman1975]

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

[@uli9643]

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!

[@Reman1975]

@@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.

[@uli9643]

@@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!

[@deanpatterson9036]

"Everytime he crashes the mill!" WTF? This happens regularly???

[@Reman1975]

@@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

[@nazroolhosein2251]

Forget the negative comments, I'm a dental technician, in my opinion you did the best ,you're a genius, thanks for the info.

[@ricrandmfx]

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.

[@ceedub04]

I would have liked to have seen it reinstalled and functioning also.

[@SergioGMN]

3D printing would have worked too

[@dragunov525]

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

[@sdy.deathcall9608]

They did not pay attention because he click baited. The title clearly says he use candle for the repair

[@frikkiesmit327]

@@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.

[@mafia461]

@@frikkiesmit327 😂🤣

[@StarlightCipher]

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.

[@klaasover]

wax repair wont hold

[@madzen112]

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

[@inventiveinsight1]

I tried this method on my channel as well, and I have to say it turned out great and very durable. Even with glue and cotton, it worked really well!

[@propolaco]

Não sei se a resistência no local ficou a mesma do restante da peça, mas a ideia é genial. Parabéns!!

[@verovero4031]

Kkkkkkk

[@davidsnyder2000]

That was a very clever repair. I wouldn’t have ever thought of that. Pretty cool to see it done👍🙂

[@MarinusMakesStuff]

One of the best videos you made to date! Awesome solution. I hope I remember this when I need it!

[@andewfusthe3rd]

I like the video but would’ve liked to see it work as a finale to the video, like going back into the application it was made for originally

[@BudoReflex]

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.

[@twoeightythreez]

May as well cast a new one out of metal!

[@venkateshgovindaiah5826]

Hands down the best “build” video I seen in a long while.

[@leroyusa935]

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.

[@DQSH8999]

It's a great get you by diring this shit inflation

[@nefreston8503]

He won't be using the gear he fixed. He will be using the revenue from this video to buy a new gear.

[@peter-peter5929]

WOOOOO!!! That was smooth. Brilliant idea and it worked perfectly. Thank you for sharing. 👍👍👍

[@viorsa8200]

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) 🔝

[@CarlFritz24]

Absolutely AMAZING ! Intelligence, Imagination, materials... !

[@gmc07joe]

It would be good to see the repaired part working on the item it is from. A durability test would be good. Nice work.

[@dazofthemoo1531]

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.

[@njfile]

Nice work. The repaired gear would make an excellent pattern for a 3D copy with carbon fibre, or a brass moulding.

[@louisguerin8513]

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.

[@njfile]

@@louisguerin8513 Some people, like myself, really enjoy fixing things, because, we can!

[@Fgh-ij1sn]

Well done! If you add graphite powder in mixture it will be even better. Graphite good vs friction and for colour in your case.

[@naturalsettings7098]

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.

[@umakantgajjewar8898]

That’s what I was thinking as well.

[@Luciphers_Workshop]

That's why he made the 4 holes so the resin had anchors

[@antonionunez3759]

@@Luciphers_Workshop So you think that the epoxy is reinforce by these holes? Interesting🤔

[@Luciphers_Workshop]

@@antonionunez3759 it anchors, it grips the plastic inside and out

[@jaybomb5022]

Considering how easily he carved that material. It's only good for very weak applications

[@mryoung8586]

This whole process looks awesome, especially if you were trying to make an aluminum mold

[@ДенисГончар-э9л]

Great video! My only concern is about temperature changes during epoxy hardening, I think it can melt that paraffin mold

[@jameslastname9171]

That’s your only concern?

[@screwsnutsandbolts]

Excellent video ! 👍

[@dan2688]

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.

[@MF175mp]

Depends on the rpm. Very Low rpm doesn't care that much about minor imbalance

[@euphanasia210]

Yeah looks way off.

[@majorpentatonic2310]

Reminds me of a story my Dad told me once from the 1940's when he improvised a clutch repair on his motorcycle using bottle corks from a chemist shop while on holiday in Wales. My Mum rode pillion and were stuck far from home when the bike broke down.

[@arielbene2013]

But how strong is it? Will you trust it with high torque?

[@striker_9]

Depends on application

[@josephmarino3045]

Finally a video that has some content that could actually work!

[@jedhughes6743]

Excellent ! The vid gives a great example for other repairs in plastic I can utilise.Thank you for uploading.

[@mehmanqurbanov3042]

Does white cement helps to make epoxy glue much more hardener ? Or its need only changing the color ?

[@Craftspenguin]

Seems it would work well as a decoration piece. Where metallic gear teeth get broken, how a cement tooth can bear that pressure?

[@michaelbedell6523]

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.

[@321tryagain]

Can you explain a bit about what "white cement" is? White portland cement?

[@technicalitems731]

I wanna know too? Baking soda that is sometimes added to super glue?

[@paulfrost8952]

I’d like to know what the white cement is as well.

[@DAS_FreelanceArt]

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.

[@321tryagain]

@@DAS_FreelanceArt So, why would you use that product specifically in this project?

[@nyscersul42]

It's role in this appears to make it's composition irrelevant. It provides complex particle adhesion within the resin to improve the strength with a less uniform structure, which makes it more resistant to shear stress. The added powder is basically doing the same job as shale or gravel added to normal pure cement to provide a better resulting strength in the material. Talcum powder, or some other powder would likely do the job as well.

[@warrenmarks9311]

Ingenious, but surely ordering a new part would be the best bet.

[@BHARGAV_GAJJAR]

Nice idea but you must make a video of it operating as a fully loaded cantilevered teeth in a gear mesh

[@poolio_69]

Great job. Should have added some black to the resin mix for an invisible repair. Interested to see how it would hold up to load.

[@nickwashburn723]

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.

[@EDToft]

To the naysayers... This is a solid repair...not necessarily a permanent fix...I have done similar repairs and one of them (though reinforced with shredded 000 steel wool fibers) is going on 7 years of use in a washing machine that gets used at least twice per week. 1) Most epoxies will be stronger than the plastic/nylon base material. 2) the through holes for anchor points are ok. Should use more smaller holes at varied angles. 3) epoxies do a great job of binding to minute abrasions in the surface being bonded and their multibranched, crosslinked polymer chains (assuming a proper formulation) essentially create molecular hooks that encapsulate the ridges of those abraded surfaces. Good build. Good demo. Well done.

[@MrBerryK]

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.)

[@JMVD48]

Thank you for this demonstration, can be useful in future. 👍

[@talentelectricals786]

This is one of the best videos. Greetings.🎉🎉🎉🎉🎉❤

[@HubCityMan]

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....."

[@ytkatz]

Thank you for documenting this process so well

[@toolman.dustin]

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.

[@4bikeregistry]

Reminds me of the time when I used a credit card to stand in for the broken reed valves on our 2 stroke boat engine. Got us back.

[@ugurylmaz144]

This is by far the most basic and most clever repair video i have ever seen. Liked and subscribed!

[@tacit46mikhail]

Браво Мастеру! Вполне жизненно-техническая ситуация,а решение ---остроумное и довольно быстрое...Спасибо и за хорошую и привлекательную съёмку !

[@savvalukhin2965]

Сомнительно, что "новый сектор" зубьев выдержит рабочей нагрузки. База крепления слабовата. Но сделано аккуратно . На совесть !

[@UlexPapov]

@@savvalukhin2965 да уж. Сделано и снято красиво. Но то, что съело пластиковые зубья, может легко съесть и эпоксидку.

[@4767Seeker]

Nice trick to copy the form. Thanks for sharing.

[@sabrinatscha2554]

This was satisfying to watch. Thanks

[@Tyemuck18]

I did this to a vintage RC car. Gone through 10 tanks and it still works.

[@cobravids]

Great job. Wonderful execution. I would have loved to see the gear back in service working. I really enjoyed the video, thanks. For some reason I was delighted to see it rolling around. Lol.

[@mafia461]

I was waiting for you to spray paint the ⚙️ gear black for a stunning look. Nonetheless, great job 👍🏻

[@edgardoa.bressan1362]

Lo aplique, muy practico, ahora esperando que endurezca. Gracias

[@RaksasaMentawai]

Cement and epoxy resin..... genius ❤️

[@Hellbent7069]

Great video, thanks for sharing. Baking soda and super glue works well to and cures much faster.

[@jeanyves5380]

Bonjour, merci pour la vidéo. C'est très ingénieux, maintenant à voir si la soudure du ciment au plastique est solide, et si la différence d'homogénéité ne produit pas une faiblesse mécanique, produisant un "décollement".

[@CreationContinuous]

Really creative, great video

[@elysehbiagini]

Amazing way to repair broken stuff 😍 thanks for sharing

[@demirpp]

Perfeito amigo. Têm muitos comentários negativos, pois os pessoal com certeza não assistiu o vídeo inteiro. A resina é muito mais forte que o plástico, duvido que não dê conta do recado. Gostei da ideia de usar a vela para fazer o molde, vou tentar utilizar nos meus projetos.

[@juanburgossanchiz1082]

Mui bonita la pieza pero tendrás que hacer algún vídeo para que veamos si aguanta la pieza de donde quiera que sea Bravo

[@fleaniswerkhardt4647]

Great work. The only thing I would do different is to use a sander for a few seconds to vibrate any air bubbles out of the epoxy.

[@adilsonarantesaparecidoara7683]

PARABENS , MARAVILHOSO , MUITA CRIATIVIDADE E COMPETENCIA .

[@rccrashtestology7289]

Nice work! If the gear isnt under intense load or high speed should work fine. Ive used my 3D printer with ABS plastic and have printed many different gears they all work well unless introduced to significant load or speed or both. The friction heats it up and causes self destruction! 😅 great video!

[@GrantOakes]

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.

[@nickbrown3023]

Well done!!!. Really like the thought and creativity involved.

[@eross21]

you should look at smooth-on plastics. they have a perfect plastic made specifically for gears and high strength parts like this. epoxy gets brittle over time and may not last long. great video though. very cool

[@ChrisHolt1]

Would have loved to see the part back in place. I have little doubt it worked. Just would have "put a bow" on an excellent video.

[@zivzoolander6705]

Can you post a list of materials used in the description please? Eg. What was the green putty stuff, or the white stuff in the syringe? Is their another more common name for "white cement"?

[@JesusTorres-qr1gz]

Wow, outstanding and impressive work, congratulations.

[@la_trastienda]

Very good repair

[@ASelman]

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,

[@williamjamison5010]

Fun fact, there is a deeper sense of satisfaction, knowing that your efforts are worthwhile.

[@oftin_wong]

They aren't

[@bluddywulf6796]

If we happen to have rcs in the apocalypse this will be a handy tip.

[@namash55]

Good job

[@alant779]

Looks surprisingly balanced. Nice work!

[@foofooblenda734]

best video 2022 so far master mold maker

[@greenlungo3996]

If you watch those shredder machine videos, you've probably seen machine or automotive gears go in there and possibly even pause the machine before exploding like a Prince Rupert's drop. They are rock hard. Makes me wonder how an epoxy-cement composite is supposed to survive the load that ground off those teeth in the first place.

[@trustenbaker8766]

YOUR playing a dangerous GAME. I don't know how much more of this your mother and I CAN TAKE!

[@YeahNoTellTheTruth]

Seriously well done

[@wadewilson524]

Very impressive! Was going to be pretty sad if those new teeth came off with the wax! A great tip if a new replacement part can’t be found! Kudos!!

[@menititehnik]

Solusi yang bagus, sangat berguna..👍very useful..👍👍👍

[@MGsModShop]

This would work under a light load. Very cool.

[@franklinfernandez5005]

Muy buena su construcción te felicito el vídeo muy explicativo exitos 👏🤗🇻🇪

[@parvindersingh]

Miraculous work. You're master expert.

[@cyberwolf6667]

Fun to watch, but is it really stable enough and what about balanced, might not need to be balanced if it’s a slow moving gear. I still enjoyed the brain power to repair it. 😊

[@PaulRestorer]

Great idea and interesting tutorial. Very clever repair.👍

[@ianpolo5673]

That is a beautiful repair.

[@oldhammer1992]

Incrível,me ajudou muito, saudações do Brasil,✌️🇧🇷😃

[@Digitallifeconcepts]

That's brilliant. Nice to know it could be a DIY if needed.

[@rbeehner2]

Ingenious. Would have like to see what the gear belongs to.

[@Roko3131]

... well done, congrats!!!

[@jameshines4012]

I would just order a new one but great repair for the short term.

[@faustdj7878]

Nice job, hopefully it holds up in the application. Would have been nice if you used black dye to make the repair look more seamless.

[@jimmybare3026]

Excellent repair!

[@knobsdialsandbuttons]

Great video ! 👍

[@Gkitchens1]

Use cooking spray as a mold release to guarantee the wax comes off without breaking

[@SusanAmberBruce]

Blindingly brilliant