I boiled one of the transformers in a pan and made a youtube video with that process (I wanted the core to expand a bit and the resin that holds the coils to soften). MOT s (Micro Oven Transformers) make this world a better place :D Very nicely done transformer conversion! Thank you for sharing!
I worked in a transformer, choke and inductor making factory for a while. We made devices so that they didn't vibrate and make noise, to improve insulation performance, and to improve efficiency. Some of the final construction steps were to immerse the devices in a bath of varnish, in a vacuum chamber. This sucked the varnish between the core laminations, the bobbins, and all of the coil windings, when the vacuum was released. Then they were drained and baked in an oven to harden the varnish. A similar process is used worldwide, using other varnish or wax. The downside is that transformers treated in those ways are very difficult to dismantle nondestructively. We often had older transformers, made by many different manufacturers, sent in for reverse-engineering and rebuild. That could be done least destructively by immersing a device in solvent for a couple of days, and then its core could be dismantled. The first 'E' or 'T' (for either 'E-I' or 'C-T' laminations) of the transformer or choke core would be drifted out with a thin drift, and then the dismantling became progressively easier. Bobbins could then be unwound, measured and turns counted, before being cleaned and rebuilt. In the light of this, your destructive method is perhaps the easiest one to adopt, if a winding can be sacrificed.
They should force all kids across the world. To learn from this man. He is doing amazing things here. I learned more in a hour watching his videos. Than all of school.
This is the most practical channel to have in your subscriptions. My brother from across the pond believes in the KISS theory " keep it simple stupid" but doesn't speak condescendingly. Allways a pleasure to get the missing or improved bits from him. He makes every day projects easier. He's worth more than you can give. Thank you Robert Murry Smith.
The KISS method is best for the home-built projects. It takes an industrial engineer and a large shop with many employees, fancy tools, plastic mouldings, metal presses, etc. to make it not simple. Those things end up at the local shops.
We were often taught as small children to test electrical batteries such as the square ones by our tongues however when using bigger electronic devices i will say this isn’t the correct way. I kno someone who actually received a large sized jolt on there tongue from this and resulted in no taste for some food. Even some smells you wouldn’t be able to detect. Over time it has gotten better but i suggest making a simple light which can detect power. As we do not all have complex electrical detectors. This is my recommendation so always use caution. Also i have found its best to use a nice size rubberized shoe to protect one from things when working with high power such as electrical plugs. Hope this helps , voltmaster.
My friend and I have been staring at a transformer for two months, trying to pluck up courage to saw into the weld. And now you come up with the [obvious when you see it] solution. Many thanks!
My old Weller soldering gun was essentially a miniature version...the secondary was a single turn of heavy copper wire. It had a separate winding for a small light. Countless uses for old microwave transformers. Great video! You probably saved a lot of headache for people repurposing these transformers.
2 thumbs up and 5 out of 5 stars for you! Great description and very nice demonstration. You have answered the question I've always had regarding turns in the top coil and effect of putting more turns.. Thank you
Hi Bob! Over the past few years, i have often stumbled on your videos, and always enjoyed them. But this one takes the cake. I was currently stumped by the EXACT problem that you explained here so nicely. In fact only a few hours ago, I rewarded a workshop mechanic with some prize money to suggest a way to remove the secondary, but he just said No, I have tried and tried, and never succeeded - they are built and sealed in the factory so tightly, it is impossible. I was planning something close to what you showed, and felt so happy for the encouragement! I have always felt that posting nice, informative videos on the net is like broadcasting seeds of help in the wind - you never know or imagine how much even a tiny bit of your kindness and effort can mean to some one! (Sorry for going on so long.) By the way I am a retired Civil Engineer, having the best time of my life, tinkering and making in my house which is more of a junkyard than a decent house! Thanks a lot for all your videos, and best wishes for every thing good in life (and beyond)!
Thank you, soo much. You are an amazing engineer. I was watching you from USA. Good job. I got a bunch of those microwave transformers. I always believe there is something that can be done using them.
Please be careful with those things! You of all people don't need to be told about with microwave Transformers, it only takes one time! Looks like you're having fun stay safe! 👍😆
I guess I am a little eccentric I like to stick my tongue on my mot gives a nice numbing effect on the front of my brain thanks for letting me know its dangerous now I guess I will have to go back to smoking crack
no indeed - I do take the appropriate precautions but the danger here is the heat - on the bare wire side you have 2 volts - that's no where near enough to do anything to you - the 240 volt side is isolated from me - this is much safer than the original transformer was
Btw, if you build a spotwelder out this, then it's better to use a chromium copper alloy for the tips, as it will stick less to the welded parts. Cheers mate !
thanks for the video. I've watched dozens of videos on this particular subject and yours is the best that I've come across so far. Thank you very much.
I want to tell you that if you apply mains to the high voltage winding you can then get 50v ac out of the old 250v winding without doing any taking to pieces. You should know that taking out the shunt core reduces the inductance and the mains winding then takes a lot of current and the transformer will get very hot even with no load.
If you take the basic microwave transformer, and use 3 parallel microwave capacitors on the secondary wire (the other secondary wire in on the casing), and initiate an arc between two copper electrodes, you can get air to burn. Burning air is different than just a plasma arc.
Very nice work. I've done quite a few of these myself, I've got quite the box full of them now. What I do is, place it in a vice with the bottom of the "M" facing up, That's the part that's welded on. The welds are very shallow and I use an angle grinder to grind them off. The bottom section comes off then. Then I put it down on a workbench, with the side I removed facing down. I use pieces of wood, about 2"X2" and 6" long to tap down both sides of the wire windings, a few taps on one side and a few taps on the other, you can grease the metal a little bit to help it slide down. I generally remove the primary winding because I use the secondary winding in place and cut out the center section up to the winding and make electromagnets out of them. If you're going to make an electromagnet out of these (and they make excellent ones!) Then you want to cut out the center section so that you're left with a u-shape which is the best for a magnet.
Great video Robert but I wouldn't recommend using vice grips for holding the nail as you could melt the springs in the giver grips as well as the nail 😉
VERY WELL DONE, The explanation was "spot" on regarding the electrical theory. And the trick to removing the secondary coil wire is going to save me A LOT of time, Thanks!!!
I have been using and rewinding microwave transformers for years in radio linear amplifier projects, both for high voltage supplies by lifting the grounded end of the HV winding, and also by removing the HV winding and rewiring with heavy gage wire for filament supplies. Many of these transformers are capable of 1 amp of current at 2000+ volts which is a substantial amount of current. The only downside is sometimes they can be mechanically noisy, and are not as efficient as transformers that are designed with more conventional core lamination and winding principle's. The upside is cost! They are dirt cheap compared to commercially available equivalents designed for this application
Your program is very helpful I had seen others run loops to the transformers I didn't know it increased the power Very interesting thank you Joey Cotton Houston Texas
Hello Robert, i just found your video when i was searching for some other tricks with MOT's and found your method of getting rid of the secondary very helpful regarding my own experiences doing it different ways. But one point i wondered about is your way of counting the turns of your new secoundary winding. I think, what you call one turn are rather two of them, with the additional one being the third. I hope my english is not too bad so that it can be understood, what i mean. I would use rather 10 turns to determine the voltage per turn the transformer delivers. Best regards Martin
6:30 great tip! most use 1 turn since its seems logical, but 2 turns are in practice way better. Yesterday I converted my 800 transforemer from 1 turn to 2 turns, and its amazing - like 4-5x more power. ( i use a chinese 2000W(2$) AC Motor regulator, and i can melt nails when the Potentiometer is only at 20% power)
I wonder how efficient one of these would be as a base for a power supply for a whole house LED power supply for exterior lights... Instead of running 120VAC around the eaves of the house for the typical LED bulbs, have actual LEDs mounted in the eaves ever couple of feet with a MOT powered low voltage line feeding all of the various LED locations...
nice presentation, just one comment: You have to add the external loop also, so when you say you have one turn, there are actually two turns ther, one of then inside the trafo and the other is the one that includes the load.
I keep a set of electrical nippers in the car, and when I see an appliance like that, I cut off the electrical cord and use it to make an extension, since it has a right-angle plug, that are useful for getting to the outlet behind the sofa. I also collect vacuum cleaners, and join the hoses, so I now have an 8m hose for the car. The rest is useful for radio antennas, etc.
The MOT I pulled out was wired backwards or something. The input coil was made of smaller wires and such and the output was the larger wires, so I ended up cutting the wrong one off
All ya gotta do is cut one of the loop ends off drive a chisel or wedge behind other end with a hammer and even a wooden wedge will work, and presto it comes right out. I've stripped literally thousands of transformers for scrap copper.
Spot on, I've a scrap piece of teak cut to shape which I use in the same fashion. Mouse Milk also works a treat if you're not in a hurry. Coat coils and let sit overnight.
The nail melts and breaks and the result is Rob shitting himself as he jumps back in a split second. Fantastic video. I have been playing with transformers lately and they are great all purpose devices. I am wondering what would happen if you used a microwave oven transformer using the secondary as primary and visa versa. What would the voltage be? Also could a microwave oven transformer be used to make a large inductor heating element, turn any screwdriver into a soldering iron in seconds, lol
hi there question because you stepped down the input voltage you got a high amperage which is why it melts the nail. You had a reading of about 2.3 V. That means you could safely touch both wires at the same time correct as long as it wasn’t hot previously of course.
6:50 i thought 1 turn is better since it has more amps, but as shown 2 turns is in practice is better :) 3:30 i came to the same conclusion , this way is the best when you have to do it multiple times i used a round steel rod for hammering the wires out, but square is better offcourse.
Yeah, I thought 1 turn would produce more amps as well. I guess it's because there's more efficient transfer of total power (Watts) when more windings on both sides share the same field. In other words, that 1 turn would produce more amps if it enjoyed the same efficiency of transferring power (from primary to secondary) as 2 turns.
@@charlesrichards5389 no , the explanation is that at 1 turn (~1volt) the voltage losses are too hight at the contact point which reduces the currentflow. 2 windings are 2x the voltage and solve that issue
HI THERE! How's it going my friend? I really liked this video!! I've been looking for a cheap welder and now I have one!!! Thanks buddy °° You're the best!
@@ThinkingandTinkering exactly mate, so rewarding following your inputs you teach and do it well, this is why your so popular. nice workshop too mate, mine is tidy and organized now too. keep sharing
So, if you wired it the other way with 230V on the low loop count side, you should theoretically get a pretty good high voltage output. One of the things about working with high voltage transformers though is that you think you are safely away from the hot wires and then you see that nice blue arc jump out and grab you...
The turns ratio here is about 100:1. Feeding it backwards would produce 22Kv, which is generally about 20 times higher than the magnet wire insulation can stand. That said, hooking a 2 turn transformer to 220V with practical inductances at 50-60hz is going to blow your breaker almost instantly it might as well be a dead short. If you want to try it, wear body armor and a face shield, and flip the switch with a long wooden stick.
@@fromagefrizzbizz9377 -- You could easily protect the circuit so that the breaker is not kicked by adding an incandescent light bulb in series with the primary... You definitely need more insulation on the wires for that sort of voltage though...
@@jakeblanton6853 Putting a resistor (which is essentially what an incandescent light bulb is in this scenario) will reduce the input voltage and hence the output voltage, in this case a *lot*, and would vary all over the place depending on load. Putting a resistor in series with a transformer used to step up or down voltage usually means you're making a mistake.
@@fromagefrizzbizz9377 -- Yeah, there's always compromises with any design decision... If you want to eliminate the possibility of blowing the circuity breaker though, using a light bulb as a current limiting resistor will work, but you will also be decreasing the power that the transformer can subsequently put out... If you were getting 22KV out of it, then you would need spark plug wire insulation type thicknesses...
@@jakeblanton6853 The reason why Fromage mentions the breaker dilemma is because the inrush excitation is much higher when reversed since the core is being magnetized from the inside out. Loaded or not. And steps need to be made when doing this to free float and 'corner ground' the neutral, as it's connected on the output side (in original use) to the core. When reversed the neutral becomes live under several fault conditions and is not advised. Corner grounding - That involves significantly more danger and steps to ensure it's done properly, and there are a whole host of differential voltage readings and requirements that must be undertaken from the device all the way back to the service utility.
I go well out of my way to salvage MOT's. Microwave Oven Transformers. Getting quite good at pulling the secondary winding's out of them. 20 minutes flat now. Slide a sheet of plastic between the two sets of winding's as protection for the primary. Hack Saw the secondary off both ends. Punch out what's left with a wood dowel. Here in the U.S.A. One 360 turn of wire provides 1v. 6 AWG Wire provides One (1) volt on secondary. Three turns makes fine Spot Welder.
Your input voltage in the USA is 110v ours is 240v so you have more turns on your primary that's why I need 2 turns on mine to do the same thing that 1 turn does for you.
Love your smarts lol and when the unexpected happens lol I got a good laugh too it's good to learn new stuff or just look at it and wonder wow amazing always smile my brother cheers mate I'm from usa but knowledge is universal
@@tcoo1999 Still,using a supercap is the easiest way. I got some small transformers, I wonder if they can achieve a spot weldin this way. Never done any kind of welding myself.
Does the transformer not hold a larger charge ? And thus is it not possible to die from such a comtact with it ? Or is your version just a steady voltage that doesent build ?
I have watched a lot of vids with mircowave transformers. The best really is a welder. However no one has really taken the time to look at the potential of this device. First it offers a household electrical system can be use to weld. Ok it would be considered mirco welding . And considering the millions of people who may actually just buy a mirco welder for home use welding the one millimetre thick steel for projects. The real question is after the device is worked out to be able to give amps and volts flow to the manufacturer to make some rods for it to be tested. Once tested this device could be manufactured by anyone as a business and rods then can be used to do anything for creative to amateur and professional tasks. I am really thinking ask you local rod manufacturers for some mirco rods to be made off the data collected. It is a win win for business and meets whatever demand is generated. Capacity to weld at home off a normal system is mindblowing. Let alone the vast creative projects it could be used for. If manufacturers don't help you contact the minister in your country or ask someone to just make them who has knowledge of how to make rods .I can see this device one day just being sold S a tool like any other.
What if you made some graphene rope and winded that up in place of the wire, I bet the residence would be real high and it would be a lot safer in theory. Of course you would have to coat the rope in some plastic epoxy to make it right.
This is how useful videos are made. Talk about something, in a generic way, take the equipment, change whatever is necessary and show the result. It doesn't take more than that. And the so-called communication experts can start watching videos like this… so that things are not just what they learned in schools….
Thank you Mr. Murray-Smith. I enjoy the content, it is very educational. And your style of presentation is very engaging.
I boiled one of the transformers in a pan and made a youtube video with that process (I wanted the core to expand a bit and the resin that holds the coils to soften).
MOT s (Micro Oven Transformers) make this world a better place :D Very nicely done transformer conversion! Thank you for sharing!
cheers mate - and thanks for the hint - never tried that
Thats a good idea. I suggested putting it in the freezer since metals contract in the cold making them loose.
I worked in a transformer, choke and inductor making factory for a while. We made devices so that they didn't vibrate and make noise, to improve insulation performance, and to improve efficiency. Some of the final construction steps were to immerse the devices in a bath of varnish, in a vacuum chamber. This sucked the varnish between the core laminations, the bobbins, and all of the coil windings, when the vacuum was released. Then they were drained and baked in an oven to harden the varnish. A similar process is used worldwide, using other varnish or wax.
The downside is that transformers treated in those ways are very difficult to dismantle nondestructively. We often had older transformers, made by many different manufacturers, sent in for reverse-engineering and rebuild. That could be done least destructively by immersing a device in solvent for a couple of days, and then its core could be dismantled. The first 'E' or 'T' (for either 'E-I' or 'C-T' laminations) of the transformer or choke core would be drifted out with a thin drift, and then the dismantling became progressively easier. Bobbins could then be unwound, measured and turns counted, before being cleaned and rebuilt.
In the light of this, your destructive method is perhaps the easiest one to adopt, if a winding can be sacrificed.
They should force all kids across the world. To learn from this man. He is doing amazing things here. I learned more in a hour watching his videos. Than all of school.
This is the most practical channel to have in your subscriptions. My brother from across the pond believes in the KISS theory " keep it simple stupid" but doesn't speak condescendingly. Allways a pleasure to get the missing or improved bits from him. He makes every day projects easier. He's worth more than you can give. Thank you Robert Murry Smith.
The KISS method is best for the home-built projects. It takes an industrial engineer and a large shop with many employees, fancy tools, plastic mouldings, metal presses, etc. to make it not simple. Those things end up at the local shops.
We were often taught as small children to test electrical batteries such as the square ones by our tongues however when using bigger electronic devices i will say this isn’t the correct way. I kno someone who actually received a large sized jolt on there tongue from this and resulted in no taste for some food. Even some smells you wouldn’t be able to detect. Over time it has gotten better but i suggest making a simple light which can detect power. As we do not all have complex electrical detectors. This is my recommendation so always use caution. Also i have found its best to use a nice size rubberized shoe to protect one from things when working with high power such as electrical plugs. Hope this helps , voltmaster.
Your explanation of the transformer might be the best explanation of transformers I have experienced.
Wow, thanks mate
Thank you, sir, for demystifying the spot welder and many other things!
Stay safe!
My friend and I have been staring at a transformer for two months, trying to pluck up courage to saw into the weld. And now you come up with the [obvious when you see it] solution. Many thanks!
Go ahead and saw that bead. Or use an angle grinder. You only have to go as deep as the bead. It can all be rewelded back together as well.
Great informative video. Thank you, Sir. I really enjoyed getting to see the outcome of different configurations (different number of turns).
Great job Professor Murray-Smith. Just the right amount of information to present to us, the UA-cam clients.
Takes me back to the science lab at school many moons ago,you have the same passion as my science teacher,the passion is infectious!!!
My old Weller soldering gun was essentially a miniature version...the secondary was a single turn of heavy copper wire. It had a separate winding for a small light.
Countless uses for old microwave transformers.
Great video! You probably saved a lot of headache for people repurposing these transformers.
cheers mate - thanks for taking the time to write
Same !🙂
Don't get no better than this! Well done sir. And thank you. Am building a spot welder as we speak.
2 thumbs up and 5 out of 5 stars for you! Great description and very nice demonstration.
You have answered the question I've always had regarding turns in the top coil and effect of putting more turns.. Thank you
Hi Bob! Over the past few years, i have often stumbled on your videos, and always enjoyed them. But this one takes the cake. I was currently stumped by the EXACT problem that you explained here so nicely. In fact only a few hours ago, I rewarded a workshop mechanic with some prize money to suggest a way to remove the secondary, but he just said No, I have tried and tried, and never succeeded - they are built and sealed in the factory so tightly, it is impossible. I was planning something close to what you showed, and felt so happy for the encouragement! I have always felt that posting nice, informative videos on the net is like broadcasting seeds of help in the wind - you never know or imagine how much even a tiny bit of your kindness and effort can mean to some one! (Sorry for going on so long.) By the way I am a retired Civil Engineer, having the best time of my life, tinkering and making in my house which is more of a junkyard than a decent house! Thanks a lot for all your videos, and best wishes for every thing good in life (and beyond)!
Hiya mate, Thank you for taking the time to say that, all the best, Rob
When I hear "Do not try this at home"
I say "Don't tread on me"
Thank you for freeing up the information!
Thank you, soo much.
You are an amazing engineer.
I was watching you from USA.
Good job. I got a bunch of those microwave transformers. I always believe there is something that can be done using them.
The things you can do with a micro transformer is amazing. Great vid as always. Such a wonderful man. I wish I had a friend like him.
You have started the wheels in my head turning. The possibilities are endless.
I love the combination of hose clamp, boost cables and vise grips!
Please be careful with those things!
You of all people don't need to be told about with microwave Transformers, it only takes one time! Looks like you're having fun stay safe! 👍😆
I guess I am a little eccentric I like to stick my tongue on my mot gives a nice numbing effect on the front of my brain thanks for letting me know its dangerous now I guess I will have to go back to smoking crack
The process he's following makes them safer than before.
no indeed - I do take the appropriate precautions but the danger here is the heat - on the bare wire side you have 2 volts - that's no where near enough to do anything to you - the 240 volt side is isolated from me - this is much safer than the original transformer was
Btw, if you build a spotwelder out this, then it's better to use a chromium copper alloy for the tips, as it will stick less to the welded parts. Cheers mate !
I watched quite a few of these videos but for some reason i like the way he demonstrated and explained everything a lot.
Nicely done! WAY easier than the last one I did.
lol - awesome mate
thanks for the video. I've watched dozens of videos on this particular subject and yours is the best that I've come across so far. Thank you very much.
That was a clever demonstration to save the iron core while getting that coil out of the way. 👏
I want to tell you that if you apply mains to the high voltage winding you can then get 50v ac out of the old 250v winding without doing any taking to pieces. You should know that taking out the shunt core reduces the inductance and the mains winding then takes a lot of current and the transformer will get very hot even with no load.
Now this is the kind of stuff I like. Thumbs up!
awesome
@@ThinkingandTinkering You sir are a very inspiring and talented teacher.
Brilliantly lucid Rob. Once again!
Looking forward to something on Fly back transformers.
If you take the basic microwave transformer, and use 3 parallel microwave capacitors on the secondary wire (the other secondary wire in on the casing), and initiate an arc between two copper electrodes, you can get air to burn. Burning air is different than just a plasma arc.
Confused, how is it different?
you can also get water to explode
FYI, there is a movement on UA-cam trying to get project videos that use MOT's banned, because they can be so dangerous, handled improperly.
One of the best explanations of a transformer aswell as a demo. Brilliant. !!!!
Very nice work. I've done quite a few of these myself, I've got quite the box full of them now. What I do is, place it in a vice with the bottom of the "M" facing up, That's the part that's welded on. The welds are very shallow and I use an angle grinder to grind them off. The bottom section comes off then. Then I put it down on a workbench, with the side I removed facing down. I use pieces of wood, about 2"X2" and 6" long to tap down both sides of the wire windings, a few taps on one side and a few taps on the other, you can grease the metal a little bit to help it slide down. I generally remove the primary winding because I use the secondary winding in place and cut out the center section up to the winding and make electromagnets out of them. If you're going to make an electromagnet out of these (and they make excellent ones!) Then you want to cut out the center section so that you're left with a u-shape which is the best for a magnet.
i am comfortably numbed,you surely got that physics into me like i never saw or heard before,thank you captain.
Great video Robert but I wouldn't recommend using vice grips for holding the nail as you could melt the springs in the giver grips as well as the nail 😉
More video gold. Thank you Robert. You make me feel mentally wealthy. You rock and thank you.
VERY WELL DONE, The explanation was "spot" on regarding the electrical theory. And the trick to removing the secondary coil wire is going to save me A LOT of time, Thanks!!!
cheers mate
I have been using and rewinding microwave transformers for years in radio linear amplifier projects, both for high voltage supplies by lifting the grounded end of the HV winding, and also by removing the HV winding and rewiring with heavy gage wire for filament supplies. Many of these transformers are capable of 1 amp of current at 2000+ volts which is a substantial amount of current.
The only downside is sometimes they can be mechanically noisy, and are not as efficient as transformers that are designed with more conventional core lamination and winding principle's. The upside is cost! They are dirt cheap compared to commercially available equivalents designed for this application
Your program is very helpful
I had seen others run loops to the transformers I didn't know it increased the power
Very interesting thank you
Joey Cotton
Houston Texas
Tip: cut the sides off then put the transformer in the freezer overnight. Metal contracts when cold making them come out easier.
Hello Robert,
i just found your video when i was searching for some other tricks with MOT's and found your method of getting rid of the secondary very helpful regarding my own experiences doing it different ways.
But one point i wondered about is your way of counting the turns of your new secoundary winding. I think, what you call one turn are rather two of them, with the additional one being the third.
I hope my english is not too bad so that it can be understood, what i mean.
I would use rather 10 turns to determine the voltage per turn the transformer delivers.
Best regards
Martin
6:30 great tip! most use 1 turn since its seems logical, but 2 turns are in practice way better.
Yesterday I converted my 800 transforemer from 1 turn to 2 turns, and its amazing - like 4-5x more power.
( i use a chinese 2000W(2$) AC Motor regulator, and i can melt nails when the Potentiometer is only at 20% power)
Very excellent, i do much with Microwave Transformers but never understud Like this time good explenation
Don't forget the flash joule graphene !
The what?
I wonder how efficient one of these would be as a base for a power supply for a whole house LED power supply for exterior lights... Instead of running 120VAC around the eaves of the house for the typical LED bulbs, have actual LEDs mounted in the eaves ever couple of feet with a MOT powered low voltage line feeding all of the various LED locations...
5:38. Very pro-active of you Mr Smith. Makes us wonder if you haven't wrestled with a plug in past projects. lol.
nice presentation, just one comment: You have to add the external loop also, so when you say you have one turn, there are actually two turns ther, one of then inside the trafo and the other is the one that includes the load.
This is sort of like a cooking show. Probably won't use the recipe, but I love watching!!!
Does it make you hungry?
Well done. I've seen a few of these.
With your explanation I now understand. Thank you.
Peace
I keep a set of electrical nippers in the car, and when I see an appliance like that, I cut off the electrical cord and use it to make an extension, since it has a right-angle plug, that are useful for getting to the outlet behind the sofa.
I also collect vacuum cleaners, and join the hoses, so I now have an 8m hose for the car. The rest is useful for radio antennas, etc.
It's low voltage but high amperage. Throw a clamp on the hot wire and meter the amperage when you spot weld.
I don't know who laughed harder, you or me, too funny
The MOT I pulled out was wired backwards or something. The input coil was made of smaller wires and such and the output was the larger wires, so I ended up cutting the wrong one off
that was brilliant, thank you!
Thank you very much learned so much from you and love your humor
Great info. I just wish that your camera work was better. Perhaps a few close up shots?
okay mate
Creative video, thanks for sharing :)
very nice demo
This is soo cool! I wish I had a dad like you
lol
Thx. Single wrap was slow to heat. Double wrap was much faster....
All ya gotta do is cut one of the loop ends off drive a chisel or wedge behind other end with a hammer and even a wooden wedge will work, and presto it comes right out.
I've stripped literally thousands of transformers for scrap copper.
Spot on, I've a scrap piece of teak cut to shape which I use in the same fashion. Mouse Milk also works a treat if you're not in a hurry. Coat coils and let sit overnight.
Thanks again Robert
thank you mate
The nail melts and breaks and the result is Rob shitting himself as he jumps back in a split second. Fantastic video. I have been playing with transformers lately and they are great all purpose devices.
I am wondering what would happen if you used a microwave oven transformer using the secondary as primary and visa versa. What would the voltage be? Also could a microwave oven transformer be used to make a large inductor heating element, turn any screwdriver into a soldering iron in seconds, lol
interesting ideas mate - I must have a go lol
hi there question because you stepped down the input voltage you got a high amperage which is why it melts the nail. You had a reading of about 2.3 V. That means you could safely touch both wires at the same time correct as long as it wasn’t hot previously of course.
I just hope nobody tries to spot weld by holding the live wires connected to Vice grips!
6:50 i thought 1 turn is better since it has more amps, but as shown 2 turns is in practice is better :)
3:30 i came to the same conclusion , this way is the best when you have to do it multiple times
i used a round steel rod for hammering the wires out, but square is better offcourse.
Yeah, I thought 1 turn would produce more amps as well. I guess it's because there's more efficient transfer of total power (Watts) when more windings on both sides share the same field. In other words, that 1 turn would produce more amps if it enjoyed the same efficiency of transferring power (from primary to secondary) as 2 turns.
@@charlesrichards5389 no , the explanation is that at 1 turn (~1volt) the voltage losses are too hight at the contact point which reduces the currentflow. 2 windings are 2x the voltage and solve that issue
Thumbs up as always Robert. Good stuff. The mad science Bob Ross of our times.
lol - awesome mate
finally someone who can explain my scraps i ve taken from my old microwaves. subbed. keep it going!
A really fine video. Useful info, to the point, and great demos. AAA+++
Another very interesting video. Naturally images come to mind of all those microwaves I took to the tip in the past.
Thanks for the inspiration.
lol - cheers for the post mate
Very interesting video, thanks
thanks robert
Great vid thanks from America west virginia
Your channel is gold
This is a great video! Thank you so much for the tips!! I have 4 of these mot's now. That will be much easier.
HI THERE! How's it going my friend? I really liked this video!! I've been looking for a cheap welder and now I have one!!! Thanks buddy °° You're the best!
glad you liked it - cheers for the post
No problem my friend!! You're welcome!
Congratulations, Robert.
Keep that good job going, because many will get richer in their knowledge
cheers mate
@@ThinkingandTinkering exactly mate, so rewarding following your inputs you teach and do it well, this is why your so popular. nice workshop too mate, mine is tidy and organized now too. keep sharing
So, if you wired it the other way with 230V on the low loop count side, you should theoretically get a pretty good high voltage output. One of the things about working with high voltage transformers though is that you think you are safely away from the hot wires and then you see that nice blue arc jump out and grab you...
The turns ratio here is about 100:1. Feeding it backwards would produce 22Kv, which is generally about 20 times higher than the magnet wire insulation can stand. That said, hooking a 2 turn transformer to 220V with practical inductances at 50-60hz is going to blow your breaker almost instantly it might as well be a dead short.
If you want to try it, wear body armor and a face shield, and flip the switch with a long wooden stick.
@@fromagefrizzbizz9377 -- You could easily protect the circuit so that the breaker is not kicked by adding an incandescent light bulb in series with the primary... You definitely need more insulation on the wires for that sort of voltage though...
@@jakeblanton6853 Putting a resistor (which is essentially what an incandescent light bulb is in this scenario) will reduce the input voltage and hence the output voltage, in this case a *lot*, and would vary all over the place depending on load. Putting a resistor in series with a transformer used to step up or down voltage usually means you're making a mistake.
@@fromagefrizzbizz9377 -- Yeah, there's always compromises with any design decision... If you want to eliminate the possibility of blowing the circuity breaker though, using a light bulb as a current limiting resistor will work, but you will also be decreasing the power that the transformer can subsequently put out... If you were getting 22KV out of it, then you would need spark plug wire insulation type thicknesses...
@@jakeblanton6853 The reason why Fromage mentions the breaker dilemma is because the inrush excitation is much higher when reversed since the core is being magnetized from the inside out. Loaded or not. And steps need to be made when doing this to free float and 'corner ground' the neutral, as it's connected on the output side (in original use) to the core. When reversed the neutral becomes live under several fault conditions and is not advised. Corner grounding - That involves significantly more danger and steps to ensure it's done properly, and there are a whole host of differential voltage readings and requirements that must be undertaken from the device all the way back to the service utility.
I go well out of my way to salvage MOT's. Microwave Oven Transformers. Getting quite good at pulling the secondary winding's out of them. 20 minutes flat now. Slide a sheet of plastic between the two sets of winding's as protection for the primary. Hack Saw the secondary off both ends. Punch out what's left with a wood dowel. Here in the U.S.A. One 360 turn of wire provides 1v. 6 AWG Wire provides One (1) volt on secondary. Three turns makes fine Spot Welder.
Your input voltage in the USA is 110v ours is 240v so you have more turns on your primary that's why I need 2 turns on mine to do the same thing that 1 turn does for you.
Thanks Robert!
Truly enjoy your videos. You are a wealth of knowledge Sir .
That was definitely cool 😎
Thank you for explaining how winding it ads more i couldnt get my head around it it never made sense to me
Love your smarts lol and when the unexpected happens lol I got a good laugh too it's good to learn new stuff or just look at it and wonder wow amazing always smile my brother cheers mate I'm from usa but knowledge is universal
These are killing people who try to use them in fractal wood burning
Hands down the quickest way to remove coils from these. The first one I did I was at it for close to 2 hours!
Tcoo, yes, this is the easiest method Ive seen as well. I never wanted to try the first method. It was a lot of hassle to do.
@@captainprototype187 yeah, I've seen people angle grind the top off the core and weld it back on. Too much of a pain in the arse
@@tcoo1999 Still,using a supercap is the easiest way. I got some small transformers, I wonder if they can achieve a spot weldin this way. Never done any kind of welding myself.
Tnx
You are very lucky in the UK. If I want 220 VAC, I have to run a dedicated line from the circuit breaker. That can be expensive.
Does the transformer not hold a larger charge ? And thus is it not possible to die from such a comtact with it ? Or is your version just a steady voltage that doesent build ?
you look like drunk mr.bean
I have watched a lot of vids with mircowave transformers. The best really is a welder. However no one has really taken the time to look at the potential of this device. First it offers a household electrical system can be use to weld. Ok it would be considered mirco welding . And considering the millions of people who may actually just buy a mirco welder for home use welding the one millimetre thick steel for projects. The real question is after the device is worked out to be able to give amps and volts flow to the manufacturer to make some rods for it to be tested. Once tested this device could be manufactured by anyone as a business and rods then can be used to do anything for creative to amateur and professional tasks. I am really thinking ask you local rod manufacturers for some mirco rods to be made off the data collected. It is a win win for business and meets whatever demand is generated. Capacity to weld at home off a normal system is mindblowing. Let alone the vast creative projects it could be used for. If manufacturers don't help you contact the minister in your country or ask someone to just make them who has knowledge of how to make rods .I can see this device one day just being sold S a tool like any other.
nice, can you make an induction heater coil using this transformer?
What if you made some graphene rope and winded that up in place of the wire, I bet the residence would be real high and it would be a lot safer in theory. Of course you would have to coat the rope in some plastic epoxy to make it right.
Very, very nice video! Great explanation! ❤
This is how useful videos are made. Talk about something, in a generic way, take the equipment, change whatever is necessary and show the result. It doesn't take more than that.
And the so-called communication experts can start watching videos like this… so that things are not just what they learned in schools….
lol - cheers mate
I have a collection of microwave transformers. Nice!
Very cool and this I found to be an easy method for getting the secondary out - and I have tried a few ways lol
I just strip down 4 microwave ovens for the magnets and transformers
awesome
I'd love to get my hands on one of them new ones for sure
Very good stuff!
They make great fractal burners as well.
awesome
careful with that many people have died
Another excellent and informative video thanks.
glad you liked it mate - cheers