DIY Demagnetizer Tool (That Works!)

[@rodneyschofield8435]

Mark, you just saved me $70. I am going to 3D print one out of plastic and glue some magnets into it. This is a great idea and tool. Thanks!!

[@Preso58]

Rodney. I only wish I could claim it was my idea. I think I saw this on the Home Shop Machinist forum. However, it's so simple and it works. Everyone should have one! Regards, Mark

[@scottgabriel9829]

The BEST video on the subject I've seen on YooToob. Many thanks.

[@greggroos2271]

Works perfectly. Made one out of alumin(i)um, fun 2 hr project that is super satisfying to use. I've used it on end mills and other edged tools by clamping a thin sheet of plastic to the drill press table tight to the bottom of the spinning magnets part. That way the end mill is separated from the spinning plastic. Thanks for the video!

[@Preso58]

That's great! I only wish it was my idea. I made a much more elegant version here kzbin.info/www/bejne/e6iXc6qPid92m5o I use mine regularly and it hasn't let me down once. Regards, Mark

[@mrc1539]

As a boy I worked in a radio repair shop, we used a soldering gun to demagnetize screw drivers. Pull the trigger , slide the screwdriver through the loop formed by two rods and the soldering tip and remove slowly. If you Release the trigger while the screwdriver is in the loop it will magnetize it. I will make one like yours because half the time I can’t find my soldering gun. LOL 😂 !

[@fredfarnackle5455]

Good tip, I've got one of those guns.👍

[@giorgiogrlj]

I still use the same procedure today

[@ronb6182]

​Yeah I got three or four if I can find one. The Weller 325 watt would work. I made a copper coil around the two hook up points. I wanted to make a solder pot but it didn't get hot enough to heat the barrel plug. I wanted to fill with solder. A torch works but it's not for indoor work. 73​@@fredfarnackle5455

[@berryj.greene7090]

Have you ever seen so much support for something so simple. Of such ideas is a genius born! I liked the solder gun solution as well. Lodestone anti-magnetic degaussing thingy!

[@gubelly]

I was impressed by your idea and have made my own version, seems to work just fine. I run my version in a battery drill.Thanks

[@Limou551]

sOME TIME THOSE VERSIONS WORK IN A STRANGE WAY, they dont demag completly. If you had a watch repair shop , fixing watches that cost 30.000 bucks, for sure you wouldnt use your version.

[@rpleym]

Made one based on your design, and it works! I had a file and a boring bar suddenly turn magnetic, and this gismo solved that problem! Thanks for the tip

[@Preso58]

COOL! I'm glad it worked for you. There's nothing worse than a scriber that picks up swarf all the time. I have also put files down on the bench only to see a little halo of steel dust form around them. Creepy!

[@MadMarker]

Thank you! I used this method with a Milwaukee M18 cordless drill. (magnets from machinists mag base) Worked perfect! Cheers from Canada!

[@MartsGarage]

Hello Mark. Thanks for posting this. I searched for demagnetising and was pleased to find this non electrical solution. I was then pleased to see it was from you, having seen you on one of Harold's excellent get together chats and your guest appearance on Rusti's channel. Anyway, I made my own version and it worked like a charm. I will be showing it in an upcoming video. So thanks again, this was really helpful to me. I'll be sure to give you a shoutout and link to this video. Mart in England.

[@Preso58]

Thanks Mart. I was also surprised when I made the first version of this tool. It seemed unlikely that such a simple concept would work as well as it does. You could easily make one of these with a 3D printer. Regards, Mark

[@2008koss]

excellent ! thank you from BC - Canada; I was suffering from the same problem.

[@JoseSilveira-newhandleforYT]

That´s clever idea! I built one with a pinball machine flipper coil and a small 12V transformer (unrectified - only AC) that works OK, but your solution can be also used in a lathe, when tools start to get magnetized, you just put your demagnetizer in the chuck and pass the tool in front of it. I like it :-)

[@Preso58]

Jose, the other good thing is that you can put the demag tool in a power drill and pass it over larger parts that aren't easy to move around. It works great for me.

[@JellyMonster1]

I have seen another KZbinr use the blue box contraption and it worked perfectly. He magnetised and demagnetised the same tool repeatedly.

[@Preso58]

I have seen that too but it never worked for me. It would magnetise a tool OK but I never had any success completely demagnetising a tool with it. I used my rotary demag tool today to demagnetise a centre drill that was holding chips. It just works every time. Regards, Mark

[@razdog9977]

Hey Presso... I am totally going to make this. I am learning to become a machinist, have been doing a lot of filing... groan... However... all my files have become magnetised due to all the friction. So this video from you is so welcome! Thank you for sharing :) Greetings from Australia.

[@Preso58]

You should probably watch the latest iteration of this tool as well. kzbin.info/www/bejne/e6iXc6qPid92m5o It has a better explanation of how to fit the magnets. Regards, Mark

[@johnjohn-ed9qt]

The construction you have is as good as it gets. The steel is fine as the mandrel, and is preferable to something like aluminum for a number or reasons, top among them being that it provides a path for the field on the non-working side and reduces stray field above the working plane to near zero. Additional benefit, to me, is that the magnets are attracted to it which can only improve the support.

[@Preso58]

Thanks for the technical explanation. This was definitely a "gut feeling" build. Magnetism is a sort of devil magic as far as I'm concerned! 😁

[@mortenz5304]

Worked like a charm. I build mine using 4 neodym magnets, each 6 mm Ø x 10 mm, and fastened to the end of a bold with some gaffa tape, and rotated with a small battery powered drilling machine. Thanks a lot.

[@Preso58]

Who would have thought it was so simple? I had previously struggled with the prospect of having to modify a mains operated transformer for an electromagnetic solution. I hate the idea of having to have live voltage to do the job so the magneto/mechanical solution was gold. Regards, Preso

[@fredfarnackle5455]

Great solution to a pesky problem! Thanks - my tools have all mysteriously got magnetised over the past couple of weeks, we have had thunderstorms but no lightning close to my steel shed as far as I know. Our previous house got struck by lightning, it caused all sorts of weird problems with a TV that got half a green screen, I took it to a repair guy as I thought the degaussing circuit was cactus - nope, that was fine. Long story short I asked him to come to my house with a degaussing wand, when he arrived I told him to go in the shower and degauss the enamelled steel shower base, that fixed the TV. The problem was caused by the lightning strike magnetising the shower base which just happened to be directly behind the wall where the TV was, up a couple of steps - hence half a green screen!

[@Preso58]

That's really interesting. We had a severe thunderstorm that killed a quartz clock movement. It stopped at exactly the same time as a lightning strike near our house. I guess those clock movements use some sort of magnetic field to move the mechanism. It was battery powered and not connected to the mains so it wasn't a power surge that did the damage. Regards, Mark

[@celebratedrazorworks]

Excellent! Yeah the step-up on the little cheapo demag is supposed to be the 'gradual' but must do it precisely. Really enjoy'd this alternative approach! Thank u.

[@joandar1]

Hello Mark, I have just had this video of yours come up in my suggestions. What a great suggestion!!! I am ordering some magnets next thing. The first thing I am going to demagnetize is my Mitutoyo Verniers. I stupidly used them to measure the diameter of same magnets, know what happened, I turned my Verniers into a good magnet. Hardenable Stainless is a most accepting media as I knew but did not think before I took the leap. Thanks heaps. Cheers from John, Australia.

[@Preso58]

John. Glad you found it useful. I have to demag my calipers regularly. I still don't know why tools of all types gradually become magnetic. It's a mystery!

[@joandar1]

Hello again Mark, I have also noticed on my scribe that it also becomes a little magnetic after a touch up on the grinder, that is also frustrating when marking something out with a ball of fuzz on the end. Cheers from John, Australia.

[@marianodiaz461]

Hi , mate, just a warning about quartz watches and demagnetisers. Some 20 years ago , I was servicing a large production surface grinder , and next to it was one of those "portal" demagnetisers, were the operator passed the parts thru , after finishing the operation. I was wearing a nice Seiko quartz , and it was about 7.30 in the evening , and we had tea at 8pm , so I finished the setting and check the part and put it through the demagnetiser, look at the watch and it was 5 minutes to 8 , yee the time fly .. so I hurry up and pass thru the canteen, and see no one there,,, hey the boss must be checking out , ...but looked at the clock in the canteen, and it was 20 to 8, so by putting the watch near the demagnetiser, it has gone 20 minutes in about 15 seconds .. talk about time traveling... Thanks for your chanel mate

[@Preso58]

I have seen that happen when I quartz watch is placed close to a heavy duty spot welder. The magnetic field around the copper arms will speed up the watch. It didn't seem to harm the mechanism but you are correct that if you don't notice it schedules will suffer! Regards, Mark

[@jimbrizendine6188]

We used to use a Radio Shack BULK TAPE ERASER (Realistic 44-232) it looks like a small iron and is about 2" x 3" You hold a button and energize it and run it over the parts to demagnetize and slowly move it away. We used it on industrial machinery that feed loose nails and it worked great.They only cost about $30.00 back in the day.

[@Preso58]

Ahh, I still remember Radio Shack. It always had a distinctive smell in those shops. That "Realistic" brand name was on everything they sold from what I recall. I did start off with the idea of modifying an old transformer to make something similar but the instructions I read about how to carry out the modifications started to get a bit scary with electricity and all. But if you could buy something off the shelf that works it would be worth it. I still use my rotary demag tool. It is stuck to the side of my drill press and I use it often. It still seems like magic when it works. Regards, Mark

[@davidschwartz5127]

It sounds like your drill press has a beat! I will be making one soon!

[@diannetipton8208]

Funny, he says “just so you know I didn’t secretly change screwdrivers off screen “…like degaussing scams are a thing. I can’t wait to try this. Also, I just learned more about magnetism here than in that physics class I failed in High School. Thanks!!

[@Preso58]

I have made three of these things and they work great. They are so simple and much safer than the doctored transformer type. I only realised after shooting all the video that I accidently took the screwdriver out of the frame during the crucial shot and as a result I had been accused of doing a switch and faking the results. If I were charging people money I guess there would be a case to answer but people are free to take it on face value. Regards, Mark

[@5tr41ghtGuy]

Awesome video. I've been irritated by lathe swarf sticking to my allen keys, and looking for a cost effective solution - this is it!

[@tweedrhino]

Just made this. Worked great! Thank you.

[@Preso58]

That's great. Mine gets a regular workout in the drill press. Regards, Mark

[@davidverdadero2426]

Do you have a diagram that you can show us indicating more about the magnets stuck inside the tube like I understand but I don't understand

[@Preso58]

The poles of the magnets just need to be opposed. So if you have four magnets, the ones at 12 O'clock and 6 O'clock will have, say, south pole down and the ones at 3 O'clock and 9 O'clock will have north pole down. You can use any even number of magnets in an array. I have seen some versions with up to 12 magnets. The greater the number of magnets, the more pulses you will get for each revolution of the tool. Regards, Mark

[@randledewees4405]

Nice! Now I'm off to de-magnetize my Mitutoyo digital calipers that got sticky, how I don't know. Tiny stuck particles on the jaws play havoc with measuring and zeroing.

[@Preso58]

I have had the same problem and it drives me mad too. The tool doesn't seem to affect the electronics in the set of Sylvac digital calipers I was using. I only place the open ends of the jaws under the rotating magnets. Regards, Mark

[@ryanwaddell6278]

U can use the magnet from a speaker and run it through the middle of it. It can be a busted speaker just completely remove the magnet . Works good too. The bigger the better. U can find tutorials on how to remove them. 🤙

[@davidbaker6195]

thank you. exactly what I was looking for. I am going to try to demagnitize an old (not too valuable) watch that isn't worth the $250 I'd have to pay for a clean/service/demag. It was running fine and it definitely came within an inch of a neomydeum magnet and I was very suspect about the hardware store piece of crap $13 magnetize/demagnitize tool. I have nothing really to lose and I have plenty of the little neo mags. Also+sorry to butt in-but as a cabinet maker 50 years with shop does your drill press not need some type of lubrication? It sounds like a locomotive coming to an abrupt halt. again, very useful video. thanks

[@Preso58]

I have used that demag tool on my Mitutoyo calipers and it doesn't seem to affect the electronics or the read head so I think it would be fine on a watch. You might need to put something like soft felt on the cap over the magnets. Parts are initially attracted to the cap quite strongly and it might scratch the watch. My drill press is somewhat noisy because I fitted a "pull gear" to the motor shaft. It is a reduction gearbox which uses planetary gears and they tend to rattle when it is in direct drive (nearly all the time). Before I fitted it I had a poly vee step pulley drive and it was super quiet. The VFD also adds to the noisiness too. Regards, Mark

[@davidbaker6195]

@@Preso58 report: made it. used it on a1969 longines automatic watch that was running well but extremely fast (the sign of magnetization) and after two tries only temporary success. After a third more extensive round of passes on both top and bottom of case- success. in fact, the watch came right back to the time it had been keeping a few months before it went off the rails. I have a feeling it must had met a random neomydeum refrigerator magnet at some point

[@xxdizannyxx]

Thank you sir, the bolt carrier for my WBP AK-47 has magnetism that I would like to remove so it does not attract metal debris if I were to shoot steel cased ammo from it, will try this to remove the magnetism. Bet you didn't think you were going to help someone demagnitize their Kalishankov when you made this video.

[@Preso58]

No, that is a surprise. I hope it works for you. Regards, Mark

[@lv_woodturner3899]

Good idea. I think the steel base helps to concentrate the magnetic field. I have read and observed the effect of the amount of steel and magnet. Place one of your magnets on a piece of thin steel and feel the force to remove, which will not be much. Take the same magnet and place on a thick piece of steel like your drill press table. It will take much more force to remove the magnet. The stronger the field from these magnets, the better they will work to demagnetize. I will have to make one of these. Dave.

[@Preso58]

Thanks Dave. It certainly seems to work but it was only after finishing it I started to second guess myself but as you point out the steel must be doing it's devil magic somehow.

[@RockingJOffroad]

Great idea, I need to do this to most of my tools!

[@mtnmonamona842]

Excellent, but no video on how you made it?

[@Preso58]

I did make another version with full detail on that build. kzbin.info/www/bejne/e6iXc6qPid92m5o Regards, Mark

[@CarbonaraLad]

i’m trying to make a demagnetiser for a tape head because any that i’ve found have been far too expensive and I can’t think of anything that would be small enough to do the job. any suggestions?

[@Preso58]

I am not sure how small you could make a rotary demagnetising tool of this type. I guess it depends on whether you can source some very small neodymium magnets. I have seen some small cylindrical types (1mm diameter and 10mm long) and you only need two if you can rotate them around a central axis. Having four just means that you don't need to spin them quite as fast to get an oscillating magnetic field. The key is to ensure that you slowly withdraw the tool from the demagnetiser or vice versa so that the oscillating field decays slowly. I would just 3D print a simple holder and try it out to see if it works on a piece of magnetised scrap about the size of a tape head? Regards, Mark

[@flemingcourt]

Thank you Mark! Just made mine and it worked like a charm!

[@TypingProblems]

does this work to demagnetize neodymium magnets

[@johnconnersmithllc6095]

How long did the stay un magnetic? I hate when I'm welding and grinding in that metal sticks all over everything I was getting my fingers

[@Preso58]

John, I find that tools like punches, scribers and rules tend to pick up a magnetic field over several months. I have a couple of those magnetic tool holders above the bench which will gradually magnetise those items near or on it. However, the demag tool is so easy and quick to use that I can pass the tools over it while it is in my lathe or my drill press quite easily. I really should mount it permanently on one of my double ended grinders! Welders will create a magnetic field around the ground and electrode holder cables because of the current in the circuit. If you have been doing any grinding, the metal dust will be attracted to the area around the cables. Regards, Mark

[@douglasakerman5218]

Great invention! Going to make one. Thank you.

[@Preso58]

Please do. It's a low tech and utterly reliable way of demagnetising things. I did another video showing how it was made here. kzbin.info/www/bejne/e6iXc6qPid92m5o Regards, Mark

[@pieterbotes8938]

Very nice idea brother. I will most certainly give it a go.

[@Preso58]

You won't regret it. It's certainly one of the tools that I find to be super useful and it's so simple to use. Regards, Mark

[@pieterbotes8938]

@@Preso58 Morning brother (4:35am here where I live). I surely agree that sometimes a tool should be magnetic but many times not, like a milling cutter. I just have to find small magnets and I will be on your level. Have a great day.

[@JonDeth]

What's going on is when you rotate it in a certain direction, the electrons swing over to one side and the protons to another creating distance, and they maintain that distance thus freeing up some of the static energy of those subatomic particles which then grab onto ferrous materials they get near. It's not that it's alternating in the sense flip flopping between positive then negative in relationship to ground. *It's just the natural effect caused by rotation as you still figured out in your own way, but the physics of what you're saying are off.* It's ultimately the polarizing of the materials and creating a North pole and a South pole at the quantum scale of the lattice of the molecules or elements.

[@be007]

nice solution, only now you make your drill chuck (a little bit) magnetic, it would be better to place the magnets in a plastic or non-ferrous metal.

[@Preso58]

I made another version of this tool for a giveaway. kzbin.info/www/bejne/e6iXc6qPid92m5o I show the entire process of making this tool including how to arrange the poles of the magnets. Regards, Mark

[@kevinc8387]

Thank you so much. I have needed one for a long time. The commercial demagnetizer are way out of my price range. Question for you. Would you make another? How much for one including postage to the USA? Thank you

[@Preso58]

Kevin, I did actually make two more but I gave them away, one to a friend and one as a subscriber draw. However I don't plan to manufacture them. They are extremely simple to make and don't need to be terribly accurate or made from metal. If you have access to a 3D printer it could be used to make the body and the spindle. You could actually embed the magnets during the printing process. Even something made from wood with the magnets stuck on with epoxy would work fine. Here is the link to the build video for a better finished design. kzbin.info/www/bejne/e6iXc6qPid92m5o

[@DE24RIP]

Just made one using a medicine bottle top wooden dol 8 6mm x 2mm rare earth magnets and a hot glue gun... Had to double stack the magnets... Used a compass to find the north and south poles. I demagnetize some AR 15 Parts firing pin and Bolt ... I spun the unit with a screw gun.

[@Preso58]

I had the idea that you could just about totally 3D print all the parts (except the magnets). It seems such an unlikely solution and it can be as simple or complex as you want to make it. Regards, Mark

[@ClownWhisper]

yes this is awesome my shop every damn tool out there is magnetized I run a couple of lathes and the mill it everything is magnetized

[@BrainHurricanes]

I just learnt from BigClive all you need to do is swipe your screwdriver over the edge of a magnet to demagnetize. Swipe over eighter pole to magnetize again.

[@Preso58]

I have great success in magnetising tools but getting them demagnetised is more complex. Especially if it's something like your digital calliper. Nothing is more annoying than having little chips sticking to the measuring surfaces and since there are two tips it's not quite so easy to do it with a single magnet. This tool does work well on larger tools or tools with odd shapes. Regards, Mark

[@BrainHurricanes]

@@Preso58 Even my drillbits get magnetized somehow, it takes no effort lol, really annoying indeed! I guess the single magnet trick is only good for simple parts.

[@woodworkerroyer8497]

I have a scratch awl that I wanted to demagnetize, but the $4 I spent on the cheap one was a waste of time and money. I'll make this the first week of my welding class this semester!

[@Preso58]

It's so simple and yet really effective. You can also mount it in a cordless drill and just take it to a part which may not be able to be removed. Good luck with it! Regards, Preso

[@josephmagedanz4070]

Best shop tip ever. Thanks!

[@Preso58]

Yes, and it's entirely mechanical. No batteries required!

[@beinghuman3225]

My drillpress, bandsaw,,,, EVERYTHING is. I hope this work on larger equipment

[@Preso58]

Did you have a lightning strike nearby? I have heard that this can cause large metal objects to become magnetised. I also recall that many large steel ships would become magnetic during their construction due to them being stationary and close to the earth's magnetic field. Regards, Mark

[@beinghuman3225]

@@Preso58 no sir. Used to have some magnets here and there on and around tools/bench. They were removed over a year ago unfortunately they still stickin around.

[@RakanKongsiBuragas]

You show to do demagnetize ,i am waiting till finish how to magnetize, because some of my magnets are weak. How to magnetize by using that device ?.

[@Preso58]

That tool is only for demagnetising parts. You can deliberately magnetise a non magnetised part by taking a rod type magnet and passing one end or pole repeatedly down the length of the part. You must stroke the pole of the magnet in one direction only and lift the magnet well clear as you go back to your starting point. You usually only need to do about 6 or 8 passes and it will pick up a good magnetic field. It's useful to be able to magnetise a screwdriver tip temporarily so you can pick up a steel screw for assembly and then use the demgnetising tool when you are done to remove the stray field. As for magnets with weak magnetic fields you are probably not going to be able to do much about that. You may be able to partially restore some magnetism if you have a stronger magnet and use the technique that I suggested for tools. Regards, Mark

[@Scott-YouTubeAddict]

Thanks Champion 👌

[@leppad]

You could use a wooden dowel to replace your metal one.

[@roahnosh]

Very nice work thanks for sharing

[@dmmartindale]

I expect that it is better for the part of the tool that contacts the underside of the 4 magnets to be steel rather than aluminum, because the steel will close the "magnetic circuit" between north and south poles of adjacent magnets, giving a stronger field on the top side of the tool.

[@Preso58]

I haven't tried that but mine works well enough. Regards, Mark

[@dmmartindale]

@@Preso58 Your is made from steel, isn't it? So the "back" side of the magnets (the side away from the working face) should either be touching steel or close to it in your tool. You should get some benefit from that, compared to making the wide part of the tool from aluminum.

[@PharaohMoan]

Absolutely brilliant!

[@JohnMc1945]

Would the magnets spaced further apart be more effective?

[@Preso58]

Not really. It is just a case of alternating the magnetic poles enough times to neutralise the residual magnetic field in the magnetised part. If you doubled the number of magnets you could achieve the same result with less revolutions but it would probably still take the same amount of time to do the job. Regards, Mark

[@JohnMc1945]

@@Preso58 I used 6061 aluminium alloy for the job, and used 8 magnets. Reason why is none of my drill spin at a high speed. Waiting on the 10mm magnets to be delivered will let you know how the alloy performs. Thanks for your prompt reply.

[@JohnMc1945]

@@Preso58 I built one using 8 x 10mm magnets and works very well. Thank you for sharing!

[@schlenbea]

Thanks for The idea!! If I could make a suggestion: oil your drill press 😂

[@Preso58]

Ben, unfortunately there's nothing to oil. Those Taiwanese drill presses have sealed ball bearings in the spindle. I bought the machine second hand and it's possible that the bearings are not the best. I converted the vee belt drive to a poly vee drive and the belt (being quite a lot thinner than a standard vee belt) does tend to flap around a bit. Also I have a three phase motor and a VFD fitted to the drill so it contributes a bit to the noise as well. Regards, Mark

[@836dmar]

I think that vfd is what people are hearing

[@chrisjh777]

Cool tool, Mark. I'll have to make one. I will use Aluminium, bu t I think any material will work. Rare earth magnets are very powerful.

[@tompas11A3n52KkX]

About the magnets being positive or negative I think you mean that they are north or south pole. Right? I guess you have to use neodym magnets, regular magnets are probably to weak. I have a demagnetization tool for use on cassette players heads but that tool doesn't work with my tools, it's probably to weak. That demagnetizer you show in this video seems to work just lika a charm. I think I will make me such an item. Thanks for the video!

[@Preso58]

Yes. You are correct regarding the polarity of the magnets. They should alternate North South. I did use neodymium magnets. They were 10mm diameter and 2.5mm thick but you could use other sizes or shapes. I am pretty sure you could make the body of the tool completely from plastic or wood even and it would still work.

[@grantmcwilliam]

How accurate is your watch?

[@grantmcwilliam]

Assuming it's mechanical?

[@Preso58]

It's a Citizen Eco Drive which I believe is a quartz watch with a solar power source that doesn't require a battery. However it does have a capacitor to store the electrical charge. I liked the watch because you never need to take it to a jeweller to have a battery replacement. I guess the thing you are wanting to know is whether it is influenced by the magnetic field of the demagnetising tool. Short answer is that I didn't notice it gaining or losing time. I do know that strong magnetic fields can affect quartz watches though. We used to have a large spot welder at the school where I used to teach and if you held a quartz watch up against the electrodes and powered up the welder you could see the watch run at about 10X speed due to the magnetic field around the copper arms of the welder. It used to amuse the students no end! Regards, Mark

[@milantrcka121]

Nice idea - all mechanical. I prefer "Electronic" method: an e-core transformer disassembled and converted to an open frame. Such as from an microwave oven or pretty much any appliance having something like 2" x 2"or bigger core. Leave primary alone (for 120 or 220VAC) or unwind it. Just a bit of care around mains voltage is necessary otherwise Charles Darwin will interfere.

[@Preso58]

Yeah, that bugger Darwin will take care of the unwary!

[@kjbigsful]

Would this work on a watch?

[@Preso58]

If it is magnetised it should work. However I am not a watchmaker and it could be that some parts of a particular watch are sensitive to magnetic fields. Also, most watches are stainless steel and those grades are generally non magnetic. Some parts like the pins that hold the bracelet together might be able to be magnetised. Regards, Mark

[@kjbigsful]

@@Preso58 Yay, It has worked so far. I have a gold filled Omega that is said can become magnetized causing it to run fast. I just used a binder clip to hold 2 (2"L X 1/2" W) magnets with 1 negative and 1 positive facing up. I then held my watch and made circular motion above the magnets while I slowly moved the watch away from the magnets. I repeated this about 4 times. Thank you for the diy that saved me a trip to the watch repair shop! I really appreciate it!

[@Preso58]

@@kjbigsful That's great! If you know anyone who owns a 3D printer you can make a simple version that can be fitted to a cordless drill. Regards, Mark

[@Tome4kkkk]

I wonder if it is going to work with a magnetized vise.

[@Preso58]

The process should be scaleable but man, you would need some big magnets!

[@Tome4kkkk]

@@Preso58 I wonder if could try your contraption "on the surface"...

[@babbitts09]

Can I speak to you about this tool? I have an idea but want to run it past you. Is there a way to contact on another without broadcasting our personal info to the world?

[@Preso58]

Sure, you can get my email address from the "about" page on my channel. kzbin.info/door/YfDX1Gno-PuJ-QWLbH09Sgabout?view_as=subscriber

[@mer9706]

Outstanding!

[@am007md]

at what rpm is the machine rotating ?

[@Preso58]

I generally run it at around 400 to 600 rpm but it's not critical. There are 2 pair of magnets with opposing poles so at 400 rpm you get 800 alternating magnetic pulses per minute. The most important thing is that you slowly withdraw the tool from the magnetic field which extends quite a way from the centre of the tool. I usually take it straight out for about 300mm which seems to completely eliminate any residual magnetism. I did a whole heap of punches, allen keys and screwdrivers just yesterday since they were all gathering fuzz of metal dust on the working ends. Regards, Mark Presling

[@truman5838]

Keeping magnets magnetic is the key to perpetual motion.

[@diannetipton8208]

Refrigerator magnets aren’t?

[@chemania1]

Brilliant!

[@Limou551]

NO, WHAT IS BRILLIANT IS, to BUY A DEMAGNETIZER TOOL. HAD ONE IN A SHOP AND IT WAS VERY USEFULL. JUST PUT THE ITEM ON THE DEVICE AND PRESS BUTTON ...ET VOILÁ-. AMAZING ISNT IT?

[@StonemanRocks]

Couldnt you rearrange the magnets on another “magnetizer” tool so you could also magnetize something if you want?

[@Preso58]

Interestingly, I have never thought about doing it in reverse. My understanding is that you can effectively magnetise a tool by stoking a magnet pole along the length of the tool (like a screwdriver) and then moving the magnet pole away and repeating the same stroking movement a number of times. The demag tool works by pulsing the magnetising process and then decaying the process until it is neutralised. If you want to deliberately magnetise something you would need to do the same action in reverse (i.e., move the tool closer) and probably at low speed. Regards, Mark

[@graemebrumfitt6668]

I like Dude! TFS (thanks for sharing) GB :)

[@frosty1433]

I have an idea: store the demagnetizer tool in a ziploc bag, because now the rubbish will stick to that.

[@Preso58]

Good idea. It does attract a lot of rubbish but the plastic cap allows most of it to be wiped off fairly easily. Regards, Mark

[@scotthaddad563]

I just took some #12 insulated wire and made about 50 turns around a wax covered 5/8” dia. Wooden dowel, the length of the coil was about 3”. I hooked it up to 110volts after wrapping with tape and removing the dowel and after about five seconds it got really hot and tripped the circuit breaker. It will magnetize a screwdriver in about 2 seconds when held inside the coil (using a momentary switch). It will de-mag same screwdriver if held in the coil and rapidly withdrawn while the coil is energized. It’s very dangerous and not recommended for anyone to try but it works for me.

[@Preso58]

Scott, I was looking to build a demag tool which I had seen described on a forum and it involved a modified mains voltage transformer. You were supposed to cut into the iron laminations but the whole affair seemed to be fairly dangerous. Some one described the rotary tool on the same forum (it's not my idea) and so far it has never failed (or killed me). Regards, Mark

[@ajdarmar]

Poles are named north/south, not +-.

[@Preso58]

Yes, I stand corrected. Back to my year 9 science book for me. 😁 regards, Mark

[@rogerdeane3608]

I have a large work shop all steel frame with steel wall and roof cladding rio etc. Every thing tools incl in my shed (work shop, not a Piza shop ) are magnetizes, even steel on the rack. it's a bloody nuisance.

[@Preso58]

There must be plenty of opportunity for magnetic fields to form in and around machinery. Welders are probably a major culprit. I have seen magnetic field line patterns around the welding leads on my steel bench after grinding steel. I also have magnetic welding clamps and lots of neodymium magnets lying around which probably all contribute to the problem. Regards, Mark

[@AgustinDavidF]

Great!

[@Preso58]

I hope you found it useful, Regards, Preso

[@ryanwaddell6278]

Check the firing pins on ur guns. Don't want a accident. Happens more than u think.

[@nou4898]

HAHA I RUINED 69 COMMENTS WITH MY 70th

[@AmmiHamzah]

Cool

[@scalamasterelectros3204]

You are over thinking it just heat it up for like 2 minuts

[@Preso58]

Trust me, I tried that and just about every other trick I knew. The thing is that when the tap broke off it was bottomed out in a fairly shallow hole so it was fully torqued down and even if I could have gotten a grip on it there was not sufficient leverage to back it out again. It was either EDM or scrap the part. Regards, Mark

[@michaelhollinshead5020]

Take My Money ...

[@robinhorn1734]

I am thinking that this could be used to disrupt the very (real!) and distressing magnetofection that some vaccinated people are experiencing.

[@Preso58]

Well, if you think it will work, go for it. It can't do any harm. Regards, Mark

[@andrewdolinskiatcarpathian]

Witchcraft 😲

[@Preso58]

I know. I was absolutely amazed when it worked!

[@5deeplogic676]

Both times, once with the screwdriver, once with the Allen wrench, you took them OFF CAMERA just before you allegedly demagnetized them. What you did may, or may not work, but it appears you were careless, or deceptive.

[@Preso58]

With respect, that's a bit unfair. I am not selling this tool nor do I make any money out of my KZbin videos. I presented the video in good faith and despite what you may think, the tool does work and I use it regularly in my workshop. Regards, Mark Presling

[@Maker-G]

Brilliant!