Disc Grinder Restoration and Conversion - 110V to 20V by Rewinding

Рет қаралды 3,900,232

2 жыл бұрын

Disc Grinder MG-125J
AC 100V 50/60Hz 8A
125 mm x 16 mm x 22 mm. 4300 m/min.
Power in 780W
Power out 480W
MITACHI
Tokyo Japan
I bought this tool from Japan recycle store without testing. When I use it, it does not seem to work well, because some bearings are broken. By replacing those broken bearing, this tool will work normal. But I want it runs with battery instead. As a result, I can do it.
Video sections
00:33 before restore testing
00:59 disc grinder blade removal
01:18 disc grinder disassembly
03:28 broken bolt removal
07:48 armature disassembly
10:04 commutator bar install
10:25 DC rewinding diagram 18V
10:29 DC armature rewinding
16:40 permanent magnet install
16:56 motor testing
17:26 carbon replacing
20:14 battery adapter mount
22:54 painting
24:48 battery disc grinder assembly
31:15 battery disc grinder grinding test
I hope you find this video useful and enjoy it!
Furthermore, I am happy to receive feedback, suggestions to improve myself.
!!! I'm sorry for the mistake if I did in this video !!!
Thank you very much for choosing to watch my video!
Have a nice day
Gear Show

Пікірлер: 932

@jlinkels Жыл бұрын

NO high speed playback, NO music, WITH natural tool and workshop audio, THANK YOU!

@Tomaszs9999 Жыл бұрын

Widzę że nie tylko mnie to denerwuje

@user-fj1zl9ul1m Жыл бұрын

@@Tomaszs9999 ,

@user-fj1zl9ul1m Жыл бұрын

@@Tomaszs9999 ,

@albeiroperez1917 Жыл бұрын

Buen trabajo mi muchacho y muchos éxitos 🙏👍

@joaquimoliveira1577 6 ай бұрын

@@user-fj1zl9ul1m😊

@alanerickson3075 2 жыл бұрын

I can definitely feel my blood pressure go down every time I watch one of your videos, it's always very relaxing to watch someone doing something right.

@gear_show 2 жыл бұрын

I'm so glad it helps you. Thank you so much for sharing!

@thirumoorthy893 2 жыл бұрын

@@gear_show Ni

@anmolsidhu2770 Жыл бұрын

@@gear_show L

@utggjhtghi1943 Жыл бұрын

@user-wv9yr5lf5j Жыл бұрын

@@gear_show۸۲۸حح ححح۸حح۸۸۷۸۲۲۲۲۲۲۲۲۲۲۲۲۲۲۲۲ح۸۸۸ح۸ححح۸ح۸ح۸۸۸ح

@lemagreengreen Жыл бұрын

Have to say I was surprised and pleased to see you rebuild the armature, never seen anyone do that.

@aquakey9834 Жыл бұрын

its prob because min wage where u're from is way over 50cts/hr...theres a whole industry of workers who rebuild armature n other consumable parts for a living, just nt in your part of the world.

@Mmouse_ Жыл бұрын

You see it a lot in places like India, something we'd just throw away and get a new one, they strip and rebuild, rewinding isn't hard it's just time consuming and fiddly. I once got a quote to have a 3 phase electromagnet rewound, the company wanted £700 to do it, a new one was £250.

@mobuildsstuff Жыл бұрын

@@aquakey9834 Not necessarily. I worked for a company in Germany which specialized in rewinding industrial motors for automated factories and heavy duty mining equipment. If you just need a standard 3p Motor its usually not worth the time, but old and specialized motors/generators are still beeing used all over different industries.

@joaosantos3229 Жыл бұрын

@@aquakey9834 ppppp

@omprakashjhangdi3514 Жыл бұрын

@@Mmouse_ g

@alexpadovano8172 2 жыл бұрын

Gear Show is the real deal. He's the only person in the KZfaq restoration game who actually rebuilds motors and fabricates battery packs. Also, I went out and bought a Makita 7.2v cordless impact screwdriver after seeing you use it so frequently.

@gear_show 2 жыл бұрын

I get more confident after seeing your comment, thank you for the comment.

@alexpadovano8172 2 жыл бұрын

Please keep it up! Seriously great stuff!

@boofe7206 Жыл бұрын

check out 'my mechanics'

@JDLarge Жыл бұрын

Sorry brother, you couldn’t hear me yelling at the screen telling you “Don’t forget the insulating paper!!!” That sucked but I bet you’ll never forget that again. It’s how we learn my friend, some lessons are easier than others… Sweet restoration overall, I did enjoy watching. Thanks for taking us along and owning up to your mistake. Honesty is the best policy and with that you’ve made a sub out of me! 👍🏼👍🏼 from this guy!

@ItsBoyRed Жыл бұрын

@@tomgreen4409 The metal is very sharp at the ends so it cuts the enamal wireing making a short, its not heavyduty insulation.

@mobuildsstuff Жыл бұрын

The motor could work if you got lucky while laying the coil and didnt scratch any insulation, but the vibration from running ac through a coil rubs enough enamel of to short the coil

@Troyvidihoo Жыл бұрын

Yeah that was surprising,I almost think he did it on purpose to show is that important step because this obviously isnt his first motor rewind! Either way it was awesome he included that, if it was truly a mistake I think most guys would have edited that out and not mentioned it!

@PaganWizard Жыл бұрын

@@Troyvidihoo I completely agree.

@user-ox3iz7vp9c Жыл бұрын

ما سر علاقة المغناطيس بالكهرباء

@mobuildsstuff Жыл бұрын

Its really nice to see someone rewinding their motors. Dont let these old skills become rusty and forgotten

@christophergrabon1294 2 жыл бұрын

Mad respect for you winding that copper!! You’re awesome.

@gear_show 2 жыл бұрын

Thank you!

@2OO_OK Жыл бұрын

That came out looking great!. The no load rpm is influenced by the strength of the permanent magnets. A stronger magnet results in more back emf and slower motor speed for a given input voltage. You could use 2 batteries in series. The original on off switch was designed for AC. You can protect it with a flyback diode for DC use. Well Done!

@xenoxaos1 Жыл бұрын

The switch it likely fine. The AC rating is typically higher than DC because most of the time it's not going to make contact at the peak of the sine wave. Without measuring the inductance of the coils, I can't determine the peak current of the the motor at start/stall. The battery probably has over current protection though. A flyback diode as well as a 30ish volt zener diode would have been good though. Not to protect the switch, but the battery. The battery should have diodes protecting the MOSFETs, but not necessarily guaranteed. The switch does disconnect the battery from the motor so the back EMF won't be a problem until the battery decides it's dead and turns off. Then the switch would still be on and the motor connected to the battery and could send high voltage spikes back to the battery. Using more turns of a thinner wire would have reduced the spindle speed and gave it more torque. I'm assuming that he did the math as number of turns at 100V and divided by 5 to get to what it could be at 20V.

@htn1986 Жыл бұрын

These are the kind of things they need to teach in school. Amazing video, thank you sharing!

@mdraju4574 4 ай бұрын

😅😅❤😅

@yasha1279 2 жыл бұрын

First thing I thought was "hmmm. No insulation paper. Well, he's the expert." Well, great restoration as always!

@gear_show 2 жыл бұрын

I saw this armature has insulation inside, but the armature stack hole is narrow for new coil.

@LISnoname Жыл бұрын

@@gear_show а почему на коллекторе не припаяны провода, почему не использовали щетки нужного формата, зачем оставили пружины в качестве токопрвода, пружины же быстро потеряют свои характеристики????

@intel386DX Ай бұрын

@@LISnonameI wondered the same. Why he did not solder the wires to the collector

@georgegeorge899 2 жыл бұрын

So...! You're the guy that showed me what's wrong with my JBL Xtreme... My battery had a swollen module... so I discarded the whole battery... I'm using the speaker without the battery because it's always staying in one place... 👍 Keep up the work !!!

@e8182461 Жыл бұрын

哈哈，馬達那邊忘了包紙，白弄了！又重拆掉，就是喜歡看有翻車的時候，讚！

@koreanature 2 жыл бұрын

Wow, My best friend, Thank you for your hard work in making the video. I enjoyed the good video. Have a happy day.

@gear_show 2 жыл бұрын

Thank you so much, my friend. I'm so glad you enjoyed this video.

@LambeauLeeeper Жыл бұрын

Hes my best friend not yours.

@CyberPick Жыл бұрын

I can't believe so much work, so complex, so skilful and finally it's working. For me it's art. Congratulations :)

@themoemechanic Жыл бұрын

0:45 *motor is sparking like crazy and sounds like literal explosions* "It does not work well" I laughed pretty hard.

@gerards-tips-and-tricks Жыл бұрын

What a challenge! I never saw someone modifying an AC motor into a DC motor. Well done!

@jzrgrmm Жыл бұрын

Those motors are called universal motors, they natively run on both AC and DC. Most corded power tools have them. I've seen people build 120/240v DC power banks to supply power tools on remote sites, and they work just fine.

@arisusnto3314 Жыл бұрын

@@jzrgrmm ttjtjjtjtjjjjjtjtjutjjtjjtjt8pppjppp7p

@arisusnto3314 Жыл бұрын

@@jzrgrmm higl

@zoisbasis7791 2 жыл бұрын

I recently was given a Makita impact driver. It's in a bad shape, no battery or charger. Can't find the courage to restore it. Hope I will manage it. Love your job. Great, relaxing & educational. Thanks from Greece🇬🇷🇬🇷🇬🇷. Keep up 👍👍👍

@guillermoocsasgamarra4327 Жыл бұрын

Da .mucha ayuda y efectiva graçias

@m0sh1994 2 жыл бұрын

Thank for this video, i asked you to do this modification in old angel grainder video by rewinding the armture and finally i see this video, it's very satisfying work👍 No noise, no lot of vibration, good grip and weigh balancing👌 I was excited for every minute in this video 😁 Keep going... 👏

@gear_show 2 жыл бұрын

Yes, I remembered you ask me to do it. Anyway, I'm so glad you like it, thank you!

@alexandres8846 2 жыл бұрын

You are very creative with a lot of skill, probably more than an industrial designer who has studied.

@gear_show 2 жыл бұрын

Wow, I'm so motivated after read your comment. Thank you so much!

@Offheap Жыл бұрын

i love this guy,he dosent fuck around ,just fixes it

@edgar7472 Жыл бұрын

Great job on the grinder,looks an sounds amazing,thanks for this videos sir.👍👍

@QuockhanhPham20 2 жыл бұрын

Around 5000rpm that wasn't too bad it still enough for grind and very safety because the speed was't too big Keep it up i love your video

@gear_show 2 жыл бұрын

Yes I will, thank you for the feedback!

@johngassmann9581 Жыл бұрын

My man is over here hand winding the armature. What an absolute mad lad!

@ralphxanderryngksai3306 2 жыл бұрын

One of your best restoration ever. That is just..... Brilliant...

@gear_show 2 жыл бұрын

Thank you very much!

@Yaman-D-Chhaya Жыл бұрын

2 words!! Simply awesome Great build brother God bless you and keep the good work going 👍👍👌👌

@youtubed.4264 2 жыл бұрын

Impeccable work, congratulations !!!! 👍🏻👍🏻👍🏻👍🏻🔝

@intel386DX Ай бұрын

Brilliant restoration, especially rewiring the rotor twise.

@francisgaming5016 Жыл бұрын

Very satisfaction to watch...Great work dude, converting from electric to battery operated grinder

@rolandolievanoagudelo.5112 Жыл бұрын

Maravillosa restauración maestro 👍

@AbhishekKumar-cj6xi Жыл бұрын

Great work. I am a DIY enthusiast and seeing your work and the ideas you implemented when you face any problem. Gives me inspiration. Keep it up good sir.

@garyjones2582 2 жыл бұрын

I knew this wasn't going to be a straightforward restoration, that you were up to something.. Well very nice 👌 work, thx for taking us along.. Take care my friend...

@gear_show 2 жыл бұрын

Thank you so much! I'm glad you like it.

@amitbhattachariya9357 3 ай бұрын

Simply Outstanding Restoration work.

@edeforelle664 2 жыл бұрын

Excellent work! Seems to be well balanced and the weight of 4Kg is still light!

@gear_show 2 жыл бұрын

Thank you very much! It is lighter than my previous drill (5 kg).

@arturlend2297 2 жыл бұрын

Patrzenie jak przerabiasz i dajesz drugie życie elektronarzędziom, to przyjemność. Szkoda że ja tego nie potrafię. Dobra robota jak zwykle. Brawo Ty 😎

@gear_show 2 жыл бұрын

Jestem bardzo zmotywowany po przeczytaniu twojego komentarza, bardzo dziękuję!

@hasansalibeyli Жыл бұрын

@@gear_show uhdsjej

@samuelbartle7136 Жыл бұрын

Good save of an old grinder makes a fantastic modern retro tool not to shabby at all 👍

@mikellewis2346 Жыл бұрын

This was very injoy able to watch. Not just your typical restoration.

@mattbanks3517 Жыл бұрын

This is the best made angle grinder i've ever seen. SO strong simple and servicable. Love the fact you can use a wrench on the hub.

@swedishpsychopath8795 Жыл бұрын

It is spinning the wrong direction, it goes half the rated speed AND the battery will overheat / be destroyed due to no BMS.

@mattbanks3517 Жыл бұрын

@@swedishpsychopath8795 to be clear i was talking about how it was built originally, but i like the fact that the man rewound the motor instead of replacing it, it's cool and creative and solid. Also, my AC enihell grinder spins twice as fast as the same model and disc size but battery powered. He should add a bms tho.

@koaasst Жыл бұрын

@@swedishpsychopath8795 most batteries havs bms built in the pack, not sure about these chinese ones, but probably. i have a bin full of starter motors, but i thought the duty cycle was so low using in a tool wasnt worth the effort.

@pachecoCardososilva 2 жыл бұрын

Parabéns seus vídeos são os melhores, eu estava esperando faz tempo por esse vídeo.

@gear_show 2 жыл бұрын

Muito obrigado! Estou tão feliz que você gosta deste vídeo.

@josiahshane3339 Жыл бұрын

You are a patient patient man and good job!!! Thank you for sharing

@MasterJENNY. Жыл бұрын

this guy have all proper, perfect, right tools, i like it.

@markdunford3181 2 жыл бұрын

Great job. Your work is so neat and beautifully crafted. Thank you

@gear_show 2 жыл бұрын

Thank you so much!

@Maranello12374 2 жыл бұрын

Дружище ,👍.. Все твои видио смотрю.. Браво...Ты по ходу уже все перечинил и уже не знаешь что переделать..,😉...Браво так держать.

@gear_show 2 жыл бұрын

Да я сделаю. Я рада, что вам понравилось это видео, большое спасибо😉!

@farukcan5815 Жыл бұрын

Gerçek bir işcilik ve ustalık... Tebrikler...

@mohamedmenacer6512 Жыл бұрын

Thank you ! pedagogic video. Recently i have do this, it cost me lot of time and money, more than simply buying a 20 V grinder.

@alan-tl5dv 2 жыл бұрын

Parabéns pelo seu trabalho muito bom continue assim ótimas ferramentas japonesas abraço aqui do Brasil 👍🏻🇧🇷

@gear_show 2 жыл бұрын

Muito obrigado! Estou tão feliz que o vídeo pop-up no feed do Brasil.

@valmirramos4195 2 жыл бұрын

Excelente trabalho GearShow! Gratidão

@gear_show 2 жыл бұрын

Muito obrigado!

@aristothethrone9032 Жыл бұрын

so refreshing. why did this ease the tension in my muscles?! is this some new form of meditation!?

@barthanes1 2 жыл бұрын

A very elegant solution. The weight of the batteries counterbalances some of the weight of the grinder.

@gear_show 2 жыл бұрын

Absolutely right, I feel it is easy to use, even it weighs 4 kg. Thank you very much!

@andersonbicalhodesouza3588 Жыл бұрын

Você sim é um profissional 👍

@domingolucena3218 Жыл бұрын

Lo que pocos se dieron cuenta que que no tiene fuera, al desvastar no ubiera quedado al rojo vivo el tornillo y eso no debería de suceder lo mismo con el disco de corte se calentó la varilla por que no tiene nada de fuerza y corta muy lento lo que quiere de cir que no asentaba el disco y eso daba tiempo al calentamiento fuera de eso buen trabajo pero inservible

@ailtonsantos9731 Жыл бұрын

Muito bom parabéns..

@pavelstoikov3780 Жыл бұрын

great video man :) as my grandfather used to say, we learn while we live :)

@yeagerxp 2 жыл бұрын

Excellent work 👍👍👍 . Thank you for sharing. Take care of yourself, be safe 🇨🇦

@gear_show 2 жыл бұрын

You're welcome and thank you so much, you too.

@ezequielsilva2709 2 жыл бұрын

Bom trabalho, adaptação muito bem feita 👏👏

@gear_show 2 жыл бұрын

Muito obrigado!

@user-sl3il5sz2s Жыл бұрын

Brilliant work done. Really interesting video.

@DiodeGoneWild Жыл бұрын

The brushes had braided copper wires going to them for a reason. A very good reason, especially at a low voltage / high current.

@masterofsome1743 Жыл бұрын

That was awesome. Thank you for the educational bits.

@Kokosha3110 Жыл бұрын

Молодец! Супер мастер! С удовольствием смотрю твои видео без перемотки ! Мозг и руки золотые! Спасибо за твои ролики, Большого успеха тебе во всем!

@user-gn6uc8pi7k Жыл бұрын

он убил рабочую ушм, сделав из неё уродца! что в этом видео хорошего???

@serfer5877 Жыл бұрын

@@user-gn6uc8pi7k рабочую?

@DoCRabbittttt Жыл бұрын

@@user-gn6uc8pi7k У нее якорь закорочен был, а учитывая год выпуска и марку, сделал приличный хендмейт ради интереса. Так что самоделка ни разу не хуйня.

@user-gn6uc8pi7k Жыл бұрын

@@DoCRabbittttt ротор и статор перематываются. а это просто уродства винтажной вещи. было бы лучше если бы он распечатал собственный корпус, это был бы хэндмейд.

@tutturu- Жыл бұрын

@@user-gn6uc8pi7k У неё корпус металлический и она в любой момент может начать хуярить током, если использовать от сети. Кто пользовался советскими дрелями - тот знает, как это "весело". Так что нормально переделал, вопрос только к снизившимся оборотам.

@marcelolaudadio.5908 2 жыл бұрын

Muy buen trabajo, felicitaciones ! Has medido la corriente sobre los 19 volts ?

@AyazRestoration Жыл бұрын

Beautiful Restoration . Good job dear friend ❤

@juanignaciocaino Жыл бұрын

a gracious bow to your skills, sir.

@johanrynjah8241 Жыл бұрын

That was a daring attempt and a successful one as well. At first I thought you're going to replace the armature with a RS-775 motor or a higher rated DC motor. The motor you converted I think its torque and RPM is equivalent to a heavy duty motorbike starter motor. It's a great accomplishment surrounded with perfection. Greetings from India.

@Rudy97 Жыл бұрын

By the amount it seemed to bog down when cutting I think it's 500-600w. Very cool but a bit slow.

@bricoda 2 жыл бұрын

Great job, always inspired by you, thank you

@gear_show 2 жыл бұрын

Thank you! I'm glad to hear that.

@mohammadjavadhosseini2309 Жыл бұрын

You are a creative and very thoughtful professional.

@gear_show Жыл бұрын

Thank you so much, I'm glad to hear that.

@donaro Жыл бұрын

Wow. Respect man. So much knowledge and skills here. Gj Man.

@andybelka Жыл бұрын

Очень впечатляет Ваша работа! Продолжайте в том же духе!

@user-qk7fn2rz9f Жыл бұрын

Чё тебя впечатляет? Как человек из старой болгарки сделал мусор?

@user-tu3yq8iz1s Жыл бұрын

@@user-qk7fn2rz9f изначально было 9.000 оборотов. Когла сделал то стало 4,700 оборотов. Ну да слабоватенько

@Zignas1 Жыл бұрын

@@user-tu3yq8iz1s Согласен, оборотов маловато. Но, с небольшой доработкой ее можно использовать как полировальную машину - для этого оборотов как раз хватает.

@BASF111 2 жыл бұрын

Очень интересно, очень умело. Спасибо за вашу работу и ваши ролики!)

@gear_show 2 жыл бұрын

Пожалуйста, большое спасибо за просмотр!

@androidmandroid7647 Жыл бұрын

What a Crazy restoration! Awesome!

@oscarbennett9253 Жыл бұрын

Remarkable engineering wow well done.

@esqueue Жыл бұрын

Great video. Love your skills. Unfortunately, it seems too slow for what we use. Just takes way too long to cut that little bolt, much less an 8-inch pipe.

@TrafficBuster 2 жыл бұрын

Hi there you're videos are very good and one thing you should not check the leakeage current using line tester because line tester cant detect voltage bellow 80v better you use Multimeter...work safely...Electricity is very dangerous and life is very important...

@gear_show 2 жыл бұрын

Absolutely right, thank you so much for the tip.

@muhamadhamami3811 Жыл бұрын

amazing modification of AC to DC grinder.

@waelelsheref Жыл бұрын

You are really an amazing teacher. I was looking for this video and I benefited a lot

@gear_show Жыл бұрын

I'm glad it was helpful!

@basedstarlordquill3148 Жыл бұрын

Overwhelming amount of knowledge.

@greattechnical_AH Жыл бұрын

Nice work and nicely done 👍

@user-nf2ms7ux6j Жыл бұрын

Clean work from clean heart ..good job .

@rezaei.abdollah Жыл бұрын

This is my favourite video in KZfaq, big like 👍👍👍

@sakibsarwat5064 Жыл бұрын

that high amp current melting soldering wires and thin wires have put smile on my face

@user-ki8nb1gk2d Жыл бұрын

یکی از حسن خوب شما این است که شما از موسیقی استفاده نکردید وانسان خوب درک می کند که دارید چیکار میکنید من به شما تبریک میگم از این مهارت بسیار خوب شما

@itti_yavut 2 жыл бұрын

incredible !!! 😱 You are a super engineer. 👏👍

@gear_show 2 жыл бұрын

Thank you very much!

@rabk5702 2 жыл бұрын

Must admit that turn out very good 👌👌👍👍

@Beenwala2 Жыл бұрын

One of the best video i never seen before 👍

@johnpartridge7623 Жыл бұрын

You did a fine job there Fella 👍

@changyongchoi3470 Жыл бұрын

정말 기술 좋네요. AC모터를 DC모터로 바꾸는게 핵심 이네요....

@deepchange2973 Жыл бұрын

Genius especially the rewinding

@user-kt2hb8xr3p 2 жыл бұрын

Great job, thank you brother. You are so talented

@gear_show 2 жыл бұрын

You're welcome, thank you so much!

@craigduddles5650 2 жыл бұрын

Brilliant work!

@dendyfebianto4157 2 жыл бұрын

I'm happy every time I see your new video, so I know a lot about unique and rare powertools that I don't find in my country.. great job.. greetings from Indonesian craftsmen.. 👍👍👍

@gear_show 2 жыл бұрын

Thank you so much! I'm glade it makes you happy.

@dendyfebianto4157 2 жыл бұрын

@@gear_show Your Wellcome brother, 🙏I have the same interests and hobbies as you. but unfortunately in my country, maybe I will have difficulty getting certain parts if I want to restore powertools.. i'll wait for next video.. 👍

@thomastechnical2075 2 жыл бұрын

Gear show you are very hardworking and honest

@gear_show 2 жыл бұрын

Thank you again!

@akibastyle3604 Жыл бұрын

Excellent work there. 10/10

@larrykelly2838 2 жыл бұрын

Great conversion, neat work.

@gear_show 2 жыл бұрын

Thank you!

@litvye4636 Жыл бұрын

That's a nice idea, the weight distribution can be in the midle of the grinder

@gear_show Жыл бұрын

Thank you!

@rafibaa Жыл бұрын

Unbelievable bro excellent job kept up.

@rolfefeutz2105 Жыл бұрын

This is amazing. I've never messed with winding wires but now I might try.

@noelsnave9395 Жыл бұрын

Good luck man.

@Hellsong89 Жыл бұрын

It wont be easy, but if you find one with damaged windings its worth to shot, just need to figure out right thickness and number of windings. I would not use this as a gospel, make your own research to make sure you know what you are doing. Personally i would have just replaced bearings that were blown while rest was in good condition.