I would recommend to replace grease in gearbox, it should stopping more "smoother" and will add some rpms to motor 🙂

Hi Vince, The circuit board monitors the battery voltage. There is a small microcontroller that talks to the battery over SMBUS and when the voltage is low or the current drawn is too high it disconnects the power via those two mosfets. I've just finished repairing a Milwaukee Spotlight, and uploaded the video on that one if you want to check it out as I know you like your Milwaukee Light too. The one I just repaired is a M12 version, and its MUCH MUCH more powerful that the other one you already have! The board in the grinder you were repairing looks very much the same board as the one in the Milwaukee Vacuum I repaired. If the Mosfets fail they would probably fail short and just send power to the device all the time as there's no over discharge protection in the Milwaukee batteries, it's all in the actual devices. The glue you are talking about on the board is conformal coating to keep moisture off the electronics. It's a bit of a nightmare when fixing their devices!

If you store opened superglue in your freezer it will last much longer. Water is what causes superglue to harden. Opened glue reacts to moisture in the air. The freezer prevents that.

Hey Vince watch all your videos your the main reason I got into repair but this one really helped. After watching it I fixed a angle grinder I had sitting up broken. I don't know much when it comes to motors but knew that was the problem. After you doing this and explaining it I was able to open it fix the magnets and it works again. Thanks saved me some money. Also still have some PSXs sitting around I can send if you would like to take a look at them great piece of Sony history.

One time, I have fixed a Dewalt hammer drill, by just cleaning the collector(the copper contacts on the rotor) gaps out of metal dust. Initially it was smoking a lot. I would go back and clean up those gaps on that grinder. You can measure those collector contacts between each other for resistance.

Milwaukee should have put plastic spacers between the magnets then they could not have slipped when or if the glue gave up the ghost

Those cut outs in the motor are to balance it properly, it’s done on anything that spins, like propeller blades, turbine’s etc, it’s like adding those weights to your car tires

I feel terrible for laughing at the glue bit!! (sorta!) Great work dude!

What a lucky lad! Brushed! The worst case if the electronics let go would be to just wire it up directly with both a regular and thermal fuse! (and possibly a Zener-referenced voltage cut-off with some MOSFETs for low battery shutdown) You could have wiggled the bearings to check for wear. And slip on some heatshrink tubing on the rear one for cushion! And re-greased the gears. As for gluing the magnets...the next time they come undone (if they will because regular superglue may not hold up with the heat) use a high-temperature variant or a high temperature epoxy. When you would use epoxy it would be a good idea to fill the gaps between the magnets!

Vince, I've watched loads of your content. I marvel at your bravery in taking apart springs as the fly everywhere on me. But I burst out laughing when you had the magnets all cleaned and the super glue in place. When you went to place it is darted off and stuck to the metal in the wrong place probably splashing super glue. I was completely immersed in that part of the task as I love electrical motors. This would definitely have happened to me too. I question your Irish heritage, because I would have bounced it off the table or at least have used a profanity!!😂😂 Great video, thank you for the surprise humour.

Hey Vince. Love your videos. I lived in the UK when I was a kid. Best wishes from the US.

Gentlemen! Welcome to the shop! Keep up the good work Vince and, as always, stay safe.

i watched the whole video, i love the logical thinking AND the comical bonding. Cheers mate

I think I have become addicted to your videos.. love them. keep it up !

Great job Vince and thankfully you managed to sneak in the IPA on this one

This was a great video to watch, keep them coming Vince

Another very interesting fix Vince, I must admit the super glue part did make me laugh!

this is the best video i ever saw in my life wow

Cool fix. Tools are expensive equipment, so well worth checking if they can be fixed rather than just buy a new one straight away.

Man, you had me panicking when the magnet flew out of your hand with the glue! 😯

Isn't the bearing now super-glued to both halves of the case? That may be a problem when taking the case apart again.

New case and bearings and Bob your uncle , well done ! Cheers from Australia 🇦🇺 👍

I think the magnets came off first. Makes the most sense to me.

It's a chicken and the egg thing again, what failed first? I'm placing my bet on the little bearing (which still needs to be replaced) failing 1st either a tight spot / dirt ingress or something causing the bearing to heat up then the motor shaft was off centre causing it to catch the magnets. Luckily not all the smoke escaped and there was enough smoke left for it to work. Good fix and you've got the patience of a saint, I would have thrown it in the bin seeing those magnets like that I must learn to be more positive in the future..

Great fix and a free angle grinder well done.

You fix things very well you take the time to do it. You are very good with your hands I enjoy all your videos I appreciate everything that you show us Thank you're Family for you taking the time out to show us You and your family Have a very blessed day Enjoy your rest of your day I appreciate all the video Thank you so much for Share your video with us You and your family stay safe God good all the time I give you 50 million thumbs up

That's was very funny, thanks for the laugh sticking those magnets🤣

Brilliant job Vince, very well done!!! 👌

Another successfull fix. Well done!

I have one of these grinders that, has been back under warranty 3 times. The rear bearing keeps failing and they just replace the whole body. Eventually the 5 year warranty will run out so this is good info 👍

Hey hey, well done! Be careful cutting near the fuel tank.

Nice Save cool to see it working

Nice fix Vince 👍

Just another great repair video and you saved it from the bin keep up your good work weather it be your Rolls Royce or on this channel.

Thanks, Vince. Fascinating as always :)

awesome fix, Vince. that glue'ing moment made me laugh, thank you for that. 🤣

Awesome! Another tool fixed and back in work :D

New tool joins the Rolls Royce fix tool team!

Well done Vince. I'm slightly concerned how the glue will hold up if the device is used under duress or builds up heat. So please be careful. That being said, I like the troubleshooting on this one and the end result speaks for itself.

nice repair, My gate motor did the same thing I used qbond (super glue) and the fill powder between the magnets this was more than 9 months ago and is still holding up. I think the wear at the bearings was from overheating that caused the magnets to come loose and jammed the tool

great video :) fantastic for the fault finding side of things :) and the comedy when all the glue went Pete tong lol :)

The smell is the give-away. First thing to check is the motor. I guess the sequence would have been, bearings lacking lubrication, dry out and overheat the outer of the bearing would start to turn causing the housing to wear, this in turn would cause the armature to move laterally coming into contact with the magnets causing grinding, (metal dust) and loading up the motor further eventually the magnets coming loose.

Well Done Vince, great fix. I'm a big Milwaukee fan so I really enjoyed that video. Thanks mate. Mick 👍👌 🍻

Hi Vince. A new clam shell would hold the bearings again properly. But I would also replace the bearings. The glue won’t hold for too long as the heat will loosen and soften the glue.

Well Done Vince 😎

About the only thing I've seen on this channel worth fixing. ;)

Hi Vince. Great video. I think the failure analysis on this one is quite interesting. I wonder if the root cause was that that tiny bearing started to fail, got hot, melted the plastic and caused the motor to fail. In which case I'd be concerned a bearing replacement might have been needed. I would have also probably built the plastic up around with glue/ baking soda because now you've glued the case together which is probably going to be a nightmare if you want to service it/ change the bearing down the line. Also, a nice tip I picked up over the years from a pro was that angle grinders don't need the tool to put a new disk on. Because of the rotation and the direction of the threads, there is no chance the nut will come off like you feared near the end. When changing the disc on an angle grinder, you can literally hand tighten the nut down, press the brake, and then twist the disc until it nips up - that's all it takes. Then when you're done, you can put on the brake and then counter-clockwise the disc by hand to take it off. This way you don't have to worry about over tightening or losing your tool. :)

Nothing that a little bit of super glue couldn't fix! Interesting that Loctite calls it Super Glue in other coutries. In Brazil the same glue is named Super Bonder.

You were correct really because years ago they called them Bushes but now they're called Brushes for some reason

Godspeed to the Queen! Long Live the King!

Keep those magnets well clear of your watch Vince!

Good job mate 👍

That's the second device I've seen where magnets have come unstuck. The other was a bicycle dynamo thing on the eevblog channel.

1st time watcher. Awesome video! Carry on.

Nice, BOLTR with My Mate Vince!

Well done ....My thoughts are the magnets failed due to prolonged use, sending the shaft out of alignment, damaging the casing. Then motor wouldn't restart due to being stuck to the three magnets, overloading the mosfets, causing the reported smoke.

look at the witness mark at 21:14 the magnet has shifted. They should be evenly spaced around the stator ring.

Nice video vince

They did to the grinder what I did which was overheat the thing to where the "glue" holding the magnets weakened and the magnets moved.

Nice repair as always :), add grease btw

Expertly done Vince =D I agree with your thoughts, the Magnets moved, shifting the centre point and causing it to pull to one side more as it rotates - affecting the platic pivot point, and also causing the wear of the magnets as it rubbed (hence all the fillings inside). Wonderful video =D LMFAO @ everything sticking btw!!! I would have used expoxy (as you said later) and for that bearing, perhaps to expand its size - heat shrink around it? Assuming its outer edge doesnt rotate...

Sodium bicarbonate with superglue in layers will make a super strong crystalized material ideal for angle grinder. You can build it layer by layer and it makes it stronger and stronger. One layer of superglue, one layer of Sodium bicarbonate. You should try it. It's 20-30 times stronger than pure super glue.

Like the old times when you weren't a car mechanic 😄

Really should have a new case. Good fix.

Vince the steel dust is from grinding. The standard problem with angle grinders. Are you keeping a running total on the hours you are spending on the Rolls? It would just be interesting to show the hours spent on each problem how restoring cars are done for love not in many instances for profit.

You can make a tool for one of these quite easily. Straight peice of metal and holes slightly smaller than the pins by 0.1mm, taper the pin ends and forge them in under pressure. You can weld them but not necessary.

nice fix , ive had that happen to me when using an angle grinder the magnets disloge and sound awfull , i just glue them back with a high temp adhesive , i think the super glue will hold if you use it in short burst , but long period i think the magnets will disloge again

awesome repair Vince im thinking the grinder was hammered for a while maybe replace the bearing were the case deformed

Might suggest some love( grease ) to the bearings and gearbox....and go back and add epoxy to build up those bearing mounts

Get an adjustable face pin tool, they fit all the nuts. I use a quick change nut on my small grinder, has a fold out tab. Works really well. Size is M14.

Great vido again! i admire your perseverance! And yes, both magnets where equally comical 😀Strange to put a bearing in a plastic casing Milwaukee! What has happend to your end tune? It was verry good! Gr. Adam

It probably was dropped or overheated causing the magnets to come unglued. I have fixed a few motors by glueing back the magnets

Vince the movement is because the top bearing isn't in place you shouldn't super glue the bottom bearing it was fine that tiny bit of play doesn't matter the reason it moves at the top is there was nothing supporting the top of the motor that is why the bearing is there and you need the make sure the gears in the gear case mesh properly when putting it back together if you just smash them together they might bind and not want to move

Love your channel and your car :) hope you soon get 1miljon subs keep up the good work ;) now i will see milwakee repair and drink coffee

Bravo !

Nice fix, I think the motor got hot, magnets slipped and it was thrown out of kilter and jammed

Great video Vince. I think that plastic bearing housing inside the case has worn and caused just enough movement for the rotor to make contact with the magnets resulting in the magnets becoming dislodged.

I can't believe you actually fixed that. I had a Makita drill and the magnets came off after a small drop and I thought it was unfixable and tossed it 😭

Any reason why the magnets ain't spot welded onto the cylinder? if it was a cheap model I could understand, but seems like something that's always designed to fail.??

Hi Vince, nice fix and a win. Regarding the magnets, I've seen already some people fixing the loose magnets. The glue seem to be loosing its grip over time and they move because of the tool's vibration. BTW, next time you get superglue on stuff - just drown it in IPA. It will dissolve. Alternative - acetone and for sensitive stuff olive oil (let it soak in to the glue, it will soften up). ANd for the missing plastic - remember the superglue + baking soda method, build it up and file down as needed to restore the shape. Hehe you can also make a video like - 100 hours of use later.

107% Brit :) "....my glue is in Rolls-royce...."

Great video as usual Vince but I can't lie I do love a traditional my mate vince moment like 29:42 😂

33:00 They make different kinds of superglue IE Cyanoacrylate (CA) glue which have different dry times including accelerators.... the thicker the glue the slower the dry time.

The HAHA gets me every time

Me think it could have been a good idea to make some kind of spacers before trying to glue the magnets...;)

Nice

Ooh vince time yay 🥰

My theory is that it had a slight drop plus wear but expoxy for long term use vince

Don't worry about the case epoxy the magnets in place and put it together and see how it runs if it runs, 5 minute epoxy would have been better also super glue let's loose with heat so hopefully it don't get to hot

Surprised the manufacturer didn't glue nylon spacers between the magnets. Would have stopped the magnets slipping

Please please find the missing handle, to give you a better grip and more control. These things have a habit of catching something and pulling away, it could easily go through to the bone if it hits your body.

Two suggestions! Use Magnetic field viewing film to view and align the magnets and use JB Weld two part epoxy. A two part epoxy has a lower set-up time and (in my opinion) is better in this application. Scuff up the bonding surface first.

That was brilliant. Please keep up the great work you are doing. Both the "fix its" and the RR restoration.

Well done, great fix. I knew that those magnets were not meant to be all on one side. Has to be evenly balanced for it to spin round. Also guessed that something in battery protection circuit would stop you checking the voltage. Where have I learnt this? I think from your videos. Would have been interested to see what happened with the good battery. You might have got some sound, maybe even smoke.

It would have been the magnets moved, and then heated up the plastic by the bearing in the handle which in turn melted that, and then allowed the grinder to go off center even more, and that is why Robert reported smoke was the plastic in the handle heating up, but usally find 3 magnets with negative charge and 1 magnet with positive charge, the 1 magnet is the one that energizes the tool, and the 3 sort of used for centering, as for direction of replacing the magnets, then not as important, because you weren't changing the polarity of the magnets, the only difference with what you done is maybe the back of the magnets weren't quite as warn as the end closest to the head gear. or maybe more warn, so in turn could have helped or hindered the centering force of the 3 magnets, but that is all that would have happened, as the magnets should still give off equal force right the way across them.

Mate the super glue part was absolutely great. I've recently had a similar super glue issue, so certainly feel your pain. When next in poundland check the superglue section. There is a packet which is similar to yrs but one tube is a debonder. This gets super glue off like water, might be useful for the tweezers. Cant go wrong for a quid 👍

metal bond glue for magnets

The first angel grinder

wonder if one of the shaft bearings on the motor went bad casuing wobble and then the rotor came into contact with the stator

If the plastic is damaged, would I cover the ball bearing near the collector with heat-shrinkable foil?