One main reason I keep enjoying your projects is that you do a great job explaining step by step process involved even in the most basic things. Great job sir.

Not sure if someone has already pointed out this minor detail, but I will go ahead and do so: when he drew the magnetic field lines for the transformer after being cut in half, the field lines should have actually gone from the middle section out towards the two open ends of the transformer at the bottom, not towards the closed end of the transformer on top. The vast majority of the flux goes in and out of the open ends, not the sides or top. You will notice this if you try to stick some iron on the top of the transformer- it will not stick nearly as well as on the open ends at the bottom. Very cool video though, and nice way of illustrating things!

Grinding, drilling, clamping, mill work, dent pulling, project or heavy material transfer, lock and that is just off the top of my head. Great video

Very impressed👍When testing heavy loads, make sure to insert safety link in both directions (use slightly loose rope), if the magnet fail at 300kg or more, the steel block will hit the car and the magnet can hit you with a great force, be careful!

Something about this dude just makes him enjoyable to listen to and learn from.

Enjoyable video, I wish my Electrical Engineering tutor at college 60 years ago had, your interesting approach about magnetic flux.

Put different sized nails into different types of soft and hard woods at different depths and see if you can devise a practical electromagnetic nail puller.

Great and useful project. I'm a woodworker with a good quality cabinet saw. I use two electro magnets in a wooden feather board to guide my work through the saw instead of using my hand (for obvious reasons), I can position the feather board anywhere on the cast iron table to fit the work I am cutting. I wished I had seen your vid before I purchased the magnets from Aliexpress. Going to build your drill press vice next.

Awesome video I enjoyed it… hopefully everything is cool down there in New Zealand looks like you guys are on lockdown over one single case! No deaths! Better days ahead ❤️

Your experiments flow just as i would do them myself, thanks for the detours

That really helps me understand how magnetic power works thanks for the great vid 👍🏼

I've watched two videos on magnetic vices. One created a "magnetic table" that holds the work with the vice mechanically attached to the table. The other used the magnet to hold a traditional type vice to the table. Both have advantages. If you want to get really creative you could try removing the other side of the core as well and see if the drill press table would work as one side of the core making a magnetically held magnetic table. 😎

Love the way you explain what your doing !

Very informative video and it gave me great info on which type of voltage/current to use. Here's a project that I'm starting to work on. I go prospecting for gold out here in Arizona and we have a lot of " black sand " in our good paydirt. I'm taking a 4" pvc pipe and going to tape/strap 2 of these on either side to pour the dirt through so the magnetic field will "stick" the magnatite ( black sand ) to the sides and let to paydirt fall through for further processing. Challenge is to build one of these and post a video. Thanks again and I'll post pics when I'm done.

+ 1 vote for next video to make a magnetic chuck or vise!

We just had roofers replace the shingles on our roof and I was thinking of how I could pick up all the nails that where left behind. Something like this with a lite weight battery on wheels to go over the ground and rip all the nails and metal from the soil would be perfect.

I will use it to load heavy pieces of steel Into my lathe and mill with my jib crane. Awesome video with how to and verification! New subscriber!!

Great video, excellent descriptions! I'm wanting to build a trommel with an electromagnet Incorporated at some point to remove nails from wood ash. Thank you for posting!!!

Best electromagnet video ever!!!! Damn good work!

Good to see that I am not the only one obsessed with magnets! I couldn't help myself - I made a video on my channel several years ago. You have given me a few more ideas...... I have several microwave transformers that might be taking on a little transformation themselves 😁 Next term I will be teaching night classes on automotive electrical subjects. I drag around a rolling trolley with heaps of wire and you guessed it.....lots of permanent magnets as well as electromagnets to show students how solenoids, motors, relays and other tricky electrical components work. I usually use a rotor out of an alternator as an electromagnet to show magnetic strength holding a solid shaft of steel, but your idea might be a good alternative (excuse the pun) option! Keep up the good work! 👍 G'day from 'Across The Ditch' MiracleMAX

That is impressive. I will be building a few of these. Thank you for shareing your knowlege.

That's a surprising amount of holding strength for such a small magnet. Maybe it could be used with cart type frame for a rolling gantry to move things around.

Great ... The pulling power was truly amazing

Thanks for your lessons!!Congrats from Aussie! 👏👏

Best explanation on KZfaq! Love the Brit speak. Bob's your uncle!

I’ve seen loads of videos on microwave transformers converted to spot welding transformers, but this is the first time I’ve seen a conversion into an electromagnet. Nice work! 👍 I’ll give it a try myself.

Great video! Very informative and helpful. 👍

Woooow!!!!thats awesome!! That was completely counterintuitive for me.thank you sir.i want to try it with circle core.

Excellent demonstration of exactly the kind of info on electro-magnets that I was looking for. Thank You! I will be watching if you decide to utilize AC power in demo and it will be interesting to see the pro's and con's of DC vs AC with powerful electro=magnets.

You could make an electromagnetic door lock. Also, the reason I am studying magnetics is to make a large magnetic lift for scrap metal. I think you very much for the ideas I have taken from your videos. Great job.

Magnifique Monsieur. Merci pour la vidéo.

wow, i had not expected that strength with only a bench power supply. I was thinking about making a big electromagnet from scratch but when you can just grind away the weld on an MOT to have a super good one at hand, that'll serve me a lot of work.

Great stuff. Electro-Vise. Gonna Build One Thanks.

I'll never look at an old microwave the same again, thanks.

Great video, good narration and not annoying like some. I came here with the same idea you had, of making an electromagnet vice :).

Everyone else on the planet would've drawn the magnet on the whiteboard with North on top. Not a Kiwi!.. Great vid, long time sub. Keep 'em coming!

A very nice presentation , thank you

This video must have million subscribers already... it is very informative!

Damn great video mate, I will now experiment on how to use this in my workshop and for teaching, many thanks, cheers.

Very useful video. Thankfully

Nicely explained, thanks for sharing :)

great video with lots of useful information thanks.

The ideas are endless so many possibilities

Really...you do have very professional welding skill. Thank GOD ....yes you do have! 😇

Very interesting - and lots of potential application. Much obliged 🤠

Very well explained.

Amazingly well explained and demonstrated, thank you, many questions answered!! Try magnet fishing!!

Make a portable wheeled card electromagnet for wheeling over the yard to pick up miscellaneous screws and nails. It'd be cool to make one for separating black sand from the other sand.

This KZfaq started with a warning about dealing with AC mains power supplies. I was more afraid for impending injury I saw developing as that chain fall was being used. Not very many years back, loggers in the Pacific Northwest of the United States lost limbs and lives from set ups just like that. Test they went home at night and toasted bread, heated their rooms, shaved their faces, and used all manner of AC devices with little or no knowledge of AC power danger, and survived till the next day. When a chain fall dragging tons of logs could break with no warning. I love you videos, and I was greatly relieved when you chose to relax the strain on that set up. Honestly, I was more concerned about the webbing failing than the scale device. All that would have happened to that device, if you had kept pulling, would have been it’s internal sensor would have turned belly up. But if that webbing would have failed you would have had a whip moving at (likely) super-sonic speeds just looking for some appendage to separate from a body.

THANKS !! You are a big help and I sure appreciate your help.

In other words a transformer core contains all the field, as long as the core isn't saturated. Thus external iron doesnt interact with the magnetic fields inside the core. But where the field exits the transformer core, they can interact with external ferus metal.

Great video bro!!!

Great video 👏👏

Congratulations. Very useful idea.

Great video man! You clearly put a lot of effort in it, and it shows. It would be a great electronic lock for your workshop. Not at max current, that would be too harsh for the winding. Or if you make it waterproof, it could be a great magnet-fishing device. Power it up with a car battery. And I sure can use a scaled-down version to get the thousands of tiny screws and bolts out of my long fibre carpet.

I love your channel. You are good at explaining things. Also I love your accent and sense of humor. Keep up the good work!

Super cool man!

Nice, use to lift megalithic blocks in chain out of a quarry the way Ed might have , seriously, it is amazing for the current used.

Keep reducing the power supply to the magnet ( volts and amps equally ) to see at what point it fails at 300 kg's, then find your wattage from that and divide it by 300 kg's to see your watt strength in Kk's lifting power. Great video, well made and informative, would never have guessed that a low resistance in the system would make such a difference.

Thanks for going thru the steps with a slow/easy understanding informativ learning 💪

Amazing!👏👏 good job. You explained very well. Keep doing...your good job...

Big with ups to you for this education , thanks heaps. Your education skills are great with your presentation with details the most important. thanks

Excellent video particularly on ease of selection of the transformer. A very cheap mag drill is in my mind I always wanted, and, what I really want to do is a cheap method to have a kill switch on my digger I need to be activated by trips for safety where the "real thing" dam near costs more than the machine. (the magnet will hold the fuel shut off open and another can similarly lock my hydraulics simultaneously on the same electric circuit). Thinking that much power would also work as a lock on the slew control (it's the real one that kills people tripping or catching clothing) in a circuit where if it's not locked the fuel and hydraulic one power off). Been trying to find a way to do this for ages.

Your welds r awesome I loved the video thank u Sir

Thank you This Demo is very good

Thanks for making this video! It's great to have these concepts explained in such an easy to understand way!

You could use your microwave electromagnet for the base magnet in a mercury vortex drive; so, you can vary the field strength and direction giving you additional control over the vortexes rotation.

Love your videos. Today I started a project to build a tape demagnetiser for old Video8 tapes, audio cassettes and reel to reel tapes. I found a good looking design and tutorial online that repurposed a Microwave transformer. I found a 240 volt LG Microwave oven with a primary winding rated at about 9 amps and pulled out the transformer and micro-switches. After removing the secondary winding as you have done I was left with the primary winding intact which I tapped up to be flush with the top of the core face like your electromagnet. My question is, I cannot get any DC resistance reading on the coil, not even .01 ohms. I cannot see any damage to the coil causing a short. I wired the coil in series with a 40watt incandescent globe which turned on normally, (not a good sign I think) I'm nervous about putting 240V across the coil in case it is indeed shorted. I suppose I could put a variac in front of the coil as well as an isolating transformer (I have a 1KVA ISO transformer) to help upsetting other electronic equipment if it violently trips my RCD. My other option is to wind a new coil. What do you think?

Excellent video. Thanks

Wow you are amazing, great channel for R&D

Wow, very impressive cuzzy bro! Just one bit of feedback and maybe someone else has already pointed this out, don't have enough time to read through all the comments. That is in your explanation of the magnetic field path in the cut core, you've got it going from the center limb to the back of the core when in reality it is the same path as in the uncut transformer, via the left and right limbs of the core. You can confirm this by checking the magnetic strength at the back of the core and you will see that it is just as weak or very close to that around the uncut core. 300kg plus, holly sh....t! Keep 'em coming, great video and very enlightening. Cheers and stay well from across the pond.

Cool video, thanks, this was very helpful! Subscribed!

Best video I've seen!

Simple as that ! Thank you.

Very informative video . Sir , thank you so much for sharing your knowledge . I am from Sri Lanka .

Something of note that could be relevant. Magnetic field is proportional to amperage times number of turns (plus or minus difference of losses) A 200 turns at 4A electromagnet will have almost the same strength as a 400 turns 2A one. Only case by case differences will make one or the other slightly stronger. Well, there are other factors to take in consideration when choosing one over the other, such as power loss into heat, thermal properties,... but that is more relevant when winding an electromagnet from scratch. The point here is to use easily available material and minimum complexity of modification. Which microwave transformers fit perfectly, plentiful, cheap and easy to power.

That’s AWESOME 👍

Great test. Electromagnet,..thanks❤

Perfect for building a mag drill press. I’m thinking put it in the base of the drill press so you can stick it onto the surface you want to drill like on multiple holes in large iron plate.

Thanks ,guy. Thats a cool idea about an electric vice block,like a workbench that holds things still while you're working. You should patent it(fast)!!😉

Excellent

E-magnets are better for reaping/tearing uses than for lateral/sheering. Just think of those permanent magnet pickup clamps; when you turn them off you basically rotating the load to short the poles...

Wow Awesome power👏 thanks for sharing

mag drill son . better still convert a drill to a mag drill. to save the cost of buying a mag drill .

9:19 the magnetic field lines are wrong. Only the cut part will expose the field lines.

very impressed! I was getting worried that we were close to find out what the weakest link of this setup was rather than the electromagnet strength itself. it might have snapped and smashed the car or fly in the air at random. great demonstration!

A very good combination of theory and application, well done! One thing though: with a cut up transformer, the vast majority of the magnetic field lines go from the center bar to the side poles, not around the transformer (9:32). That's what causes the field loops to be closed when an metal object goes across.

You can double the range of your measuring instrument by using a simple tool called a 'snatch block' which consists of a single pulley, You will have to move the cable running thru the snatch block twice as far as you would be moving the load, but you would only be using half as much force to move it. Just measure that force and multiply by 2 to double the measurement range of your instrument.

very cool. so small yet so powerful. I made an electromagnet using a 65-pound steel bar and about two hundred feet of insulated copper wire. then hooked it up to a 12-volt deep cycle battery. it was strong, but not as strong as that little one you made. And it got hot quick. Thanks for the perspective. Ill change my design. ; )

Brilliant!!!

silicone or encapsulate it somehow to make it for under water magnet fishing. could be a cool product to sell on the cheap that works with portable powerful batteries like bike batteries or stronger. excellent work your doing!

good boy.....same as i use...angle grinder/chop off saw (homemade from furnace motor, and microswitches from microwave).....to re-create MOTs for chargers, welders, etc. made an 18 volt dc supply for cordless tools, converted to corded tools, ...mots rewound for 19 volts dc with capacitors and bridge rectifier.....all work wonderfull....good for you...

woow Bryman i really happy see all hobbyist engineers using over expensive flukes

thanks for your video

That was awesome

Hi! Thanks for teaching this kind of stuffs to do! Sorry my English but what's the best connection to make a magnetic drill press vise with two 220v microwave transformers? In parallel or in series? What the amperage I should use to turn on a 12v DC power supply without having a heating problem?

Thank you for the great explanation and demonstration. Most helpful for me is your way of choosing the wire best suited for your requirements.

Speaking of saturation. Seeing the core expelling some magnetic field at 4 amps means 4 amps is too much magnetic field for the core and you have saturated it. You should have dialed the voltage down to push less current through until your under saturation point. Then you can cut open the core. Pushing more current passed saturation does little to add to the magnetic field past saturation. Thus the extra current does little more than create heat and unessesarily waste energy. (Added after have posting to include new information and avoid confusion) sometime Transformer designs include an air gap to increase the point where current saturates the core. That said, cutting the core in half introduces a large air gap which could presumptivly push up the point where current saturates the core to well beyond 4 amps, but if one closes the air gap with a ferrous metal, it will lower the saturation current again. Takeaways: There are more things to consider when determining what is the ideal current for a given core and how one intends on using it.

amazing!

Hindsight beats foresight by a darnsight! Good video BTW, thankyou