A new method of repairing a broken tooth of Gerari is a good method made of silver metal mandrel #new #method #repairing #broken #tooth #gear #good #made #silver #metal
The repair looks really good, but in that last shot I can tell just by looking at it the weld didn't get proper penetration. There shouldn't be a harsh line like that. I can't say if the entire weld didn't, but that edge sure didn't. The entire filler surface probably should have been cleaned via a little grinding prior to welding.
That edge might just be a bit of overhang from the lathe operation, made more obvious by the contrast. I get the same out of my cast iron gears..I can never get the weld dead flat with the rest of the gear without digging into the side of the rest of the gear so I wind up with that. Back lash in the carriage I suppose.
Other than insufficient cleaning and poor welding, using an angle grinder to shape the welded tooth will never give him the correct angle on the drive or coast side of the tooth. If the angle is too steep, it will load the next tooth in line excessively. If the angle of the tooth is too shallow, it will load the previous tooth excessively. Either instance will result in more broken teeth. Better cleaning, shielding adjacent teeth from splatter and using a high nickel rod would give the best possible life. Using a form ground carbide cutter in the lathe toolpost, he could have broached the tooth to be EXACTLY like all of the other teeth.
Я не устаю смотреть такие видосики. Когда совсем плохое настроение, включаю их и мне становится легче - как же много вокруг долбодятлов и самооценка, а с ней и настроение повышаются. Я считаю, что это терапевтические видосики, получше любого доктора психотерапевта!!!
мне тоже нравятся такого рода видео, я учусь в центре технического обучения и люблю сварку, этот человек хорошо работает, но его работу нужно немного довести до конца
It all depends on the gear tolerances. If these are loose-fitting gears, this repair may be adequate. But if the gears are tightly fitting, eyeball grinding is not good enough. The gears are likely to wear and clank and grind, perhaps wearing in to better conformance, perhaps to worse. Only time will tell.
I didn't think about that, but you are correct, I saw a few episodes on manufacturing machinery, and some of the gears they were making had to be within a certain tolerance, guided with a computerized cutting machine and checked within a tenth of a millimeter. 😦😦
if you look at the gear you will see that there is a lot of wear on one side so there is no way that it could ever be described as a "close fit" gear train.
I did the same thing on the ring gear on a locomotive. Lasted a while and eventually they had to pull the engine and replace the gear. Kept them going anyway.
3rd world countries do what is needed with what they have, it is commendable, and good to keep repairing. If only new machines could be repaired like the old ones can be.
you think in a 3rd world country, that can't afford much, wouldn't want to do a poor repair job that breaks apart maybe causing more damage to more gears!
I've seen hundreds of these videos. One in a dozen they show the truck driving away. They never show if it still worked an hour, a day, or a month later. I bet, usually broken again.
Complain complain.. it needs to be hardened and forged etc.. this will work cause it is flexible as long as the sharp load is placed elsewhere on the gear it work
There is nothing even remotely "New" about this method of repairing broken gear teeth. My family were doing this in their workshop back in the 1920's ( that is over 100 years ago) on steam engine gears. In those days about the only welding rods that were available were early Quasi-Arc rods and the AC power source was very crude. After the war we were running nearly 100 engine driven Lincoln, Petbow and Hobart welding sets. The only difference being that welding power source and welding rod technology has come on in leaps and bounds since then. Ps back then there was no such thing as an "Angle grinder" but we had the some of the very first Flex grinders that came into the UK back in the 1960's. So the gears had to be set up on the "shaper" to re-cut the tooth profile.
@@tigerteff015 Look at the title of the video where it clearly states "A new method of repairing a broken tooth of....". Does that help clarify the error in your comment?
Para un mecanismo sin grandes requerimientos puede servir como chapuza para salir del paso. En todo caso lo que se añade es otro material sin penetracion y el tallado con amoladora una barbaridad aunque sean dientes rectos.
Old method it work's but not long lasting in some case because grinding ,welding both are not so proper but it is hand work not shaper or milling machines. Good job good effort excellent.
All is there it is to make the Gear Working I am worried about the Material of Electrode that it should be near to the Gear Material. Thanks for the Video.
10:30 🤣🤣🤣 ну думаю, а где фрезер?? а вот и фрезер!! А сразу он угловой пилой не мог обойтись?? бор машинку возьми, лапоть! Нет, я уважаю рабочих людей и эти тонкости -- не по нашей вине, но повеселили меня, спасибо!
Primero no es algo nuevo, lo hacen en muchas partes del mundo. Segundo, este tipo de reparaciones son "pañitos de agua tibia". Sirven para salir de un apuro momentaneo. Eventualmente esos dientes deberan repararse nuevamente puesto que las propiedades de esos materiales no es la misma que solo soldar y esmerilar. De hecho con solo calentar el material ya existen cambios importantes en la estructura metálica. Normalmente las ruedas dentadas son aceros de alta dureza, generando resistencia al desgaste. Al calentar la zona, posiblemente produzca una cambio de fase, y lo q antes era resistente ahora ya no lo es.
This gear is steel but many gears are cast iron which are far more difficult to weld, Depending on the hardness of the gear itself this might last a long time.
I'm excellente mechanikal enginieus and high class specjalista from Pakistan. My quastion is, what is that "hardeness" iin metal, which you are talking about?
welded incorrectly see the glaring gap in the weld(s) piled it on without removing all of the slag every time he poked at it with the rod a drop at a time
Well, if the tooth is too hard, it will bend off. The core must be a bit more flexible than the surface and there aren't neither temperiong nor hardening. It will simply crach again and a bit lower this time. It is simple physics.
I know is a patch and is a nice work, But the lathe sparks shoe that the gear got a higher carbon content than the weld , is just a time to this to get to fail as welding damages cast metal
1:Dude makes the involute gear profile by hand with grinder... 2:He kills the hardened teeth with metal casting. 3: The repaired teeth and their surrounding are not hardened again.
sure it will . it's only 1 tooth. every old machinery repair book shows how they would braze back missing teeth with brass which is way softer that steel. it's been done forever.
its ok for low rpm and a gear tolerances that leeve yous whit some play and loose anyway repair all always made on old machine whit wear and some loose and play anyway it work for 5 years do so you jus gain 5 years
That kind of welding leaves residual stresses in the material up to yield point. That makes the “repaired” tooth very weak indeed, i.e. it cannot transmit the original torque. 😒
Seems like an unneccessary amount of work just to finish with an angke grinder. Might as well have just built up the tooth with multiple passes on arc welder befire grinding it down.
They "repair" those parts just to put them on display in automotive museum in the departament with extremely botched repairs. They will be used as a warning on how not to amend parts which lead to serious deadly accident.
looks good, but that weld will not hold up unless that gear is just for timing, better off drilling then tapping a screw(s) into that area, and then weld it and grinding, or you get a proper HOT full penetration weld (but that cast material probably is full of junk inside it ) ...
Those Welding Shoes 👟 Are OSHA Approved In Pakistan Why are these people Always Squatting on the Floor Like They Are Taking a Crap No Chair's? if not make one you have a Welder!
Isso ai que move nosso mumdo da tabalho pra fazer e por isso que cobram caro lo servisso ai o cidadão tem que tirar o escorpiao do bolsso sem pestanejar top exelemte
