How to Make a Demagnetizer 181 tubalcain magnatize

[@just_a_guy_doing]

had to chuckle, "no one sews anymore"... And here I am sewing my daughter's halloween costume from scratch.. Using a sewing machine that was around when I was a kid. Thank you mom and my Home & Careers teacher for teaching me another one of my invaluable talents to add to my ever growing wealth of knowledge. Like I tell my students, you won't stop learning till the day you day, and even that day you will learn something. Thanks for another great video. Chad

[@mrpete222]

+QuainBuilt Thanks for watching--I should of sai--not many

[@dragman377]

I seen this video a while back. Had a cooling fan motor go bad and remembered this video. So, I began to make me one. When I was ready to try it out, I held my breath and wa-la it worked ! It worked great ! Thanks again for this info Mr Pete. I wished I know about this back in high school science class. I could have really impressed my teacher.

[@mrpete222]

Thanks 👍👍👍

[@BrianB.-lb8du]

Hey there Mr Pete....We're the same up here in Canukistan as USA....60 Cycle. I realize this presentation is now 4 yrs old, but I am trying to view all your presentations. Cheers from Canada and thank you for all your efforts!

[@johngayder9249]

Fun fact: 25 cycle power was still used by some electro-chemical industries in the Niagara area up until 2005. It was generated at the Rankine Generating Station.

[@derekwilkinson7939]

I absolutely agree. I don’t watch any TV at all. I watch KZbin videos. I think it’s fantastic that people like your self pass their knowledge on to others.so it’s a big thank you from me. 👍

[@mrpete222]

Thanks

[@wb8ujb]

Awesome idea, thank you... going to make one myself... As a kid, I used to work with my father rewinding motors in our basement. When other kids were playing baseball I was down there working on these things. My baseball field was the Hamshack, working with Dad building electronic things. Motors and transformers are really fun to rewind. Thanks again, I enjoy all your video's.

[@mrpete222]

+Robert Mitchell THANKS for watching!--I watched my dad rewind a grinder motor when I was a kid

[@1969elder]

Love your videos and discussions. Im 48 and I'm not in a nursing home but every 2 weeks I go through a treatment at home for 4 days called IVIG for my illnesses and it makes me wheelchair bound for a few days so I hope I count in the catalogues you mentioned for I love your videos. I've learned a lot from your very informative comments so please keep them up. I enjoy learning and always feel blessed every day I have left to be able to learn from others I try and pass on to my kids knowledge from the past (I'm 48) and skills that are a dying commodity. So please continue to get side tracked, insert addition random thoughts and comments when ever you feel the need. I'm sure there are several of us that enjoy them. Thank you sir, and this Texan and Navy vet tops his hat to you for sharing your knowledge and time.

[@patrickroeill8746]

thanks Mr Pete I need to make one I was going to look into buying one but thanks to you I can save a few bucks your my favorite shop teacher you bring back some good memories

[@mrpete222]

Thank you for that

[@russelldold4827]

Just used this to make a demagnetiser for my watch tweezers and screwdrivers. Used the coil from a small fan motor. Thank you, Mr Pete!

[@mrpete222]

Nice work!

[@wvbiker746]

Nice video. Thank you, Been needing a demagnatizer. 900 bucks to buy a large store bought one. You just saved me a bunch. Thanks.

[@mrpete222]

👍👍

[@craigbinder5560]

Growing up my father left and while he was around he worked most the time so always made sure we had food in our bellies and the lights were on but wasn't able to pass on his knowledge of how to be a man or how to do the things around the house that a man needs to do and now that I have a son and daughter channels like yours make it possible for me to pass that knowledge to my kids so I can be the father I had and the father I wish I had and I don't have the words to convey how much that means to me sir thank you so very much for the knowledge and life experience you're sharing truly means the world and ps my kids don't have a mom around so after I complete the degausser I got to oil up the sewing machine and fix the little lady's jeans pocket was gonna do it by hand but need the practice 😂

[@mrpete222]

Thank you for the intimate details of your growing up. I was fortunate to have both parents. Nowadays, most homes are single parents. And some of the bad neighborhoods, there are never any fathers involved, and that is the root of the problem. But you’re making it up with your own children, and that is wonderful.

[@stephenmetsch6316]

Glad this is still up. I am off to the shop in the AM to make one with a motor "in stock". Your ramblings are fun. Thanks

[@stephleonard2544]

I will tackle making one. Your video wasn't in vain. Like most of us I actually have a few motors as candidates just laying about. Thanks for continuing to teach. Another great video

[@marcusthomas3003]

Glad to have watched this video have taken many old motors apart from washing machines etc. Thanks for all the extra details on the start winding mechanism as the alternative to capacitance start. Always aware of danger I am exposed to. Great Video again Mr.Pete

[@mrpete222]

+Marcus Thomas Thanks for watching

[@rickb5113]

I never tire of your videos,Your are a wealth of knowledge. Thank you

[@mrpete222]

Thanks

[@mikec.1259]

I agree 100%, I'm still rebuilding my SB 10L, but for now just adding to my machine knowledge on KZbin. Thank Mr. Pete.

[@mrpete222]

+Mike C. THANKS for watching!

[@bendavanza]

I wanted to reply to your comment about TV. I also watch much more KZbin than TV these days. Most TV is garbage, with a few exceptions. It's authors like you who make KZbin what it is and what keep me coming back.

[@mrpete222]

+bendavanza THANKS for watching!

[@rogerlarratt9651]

bendavanza ,

[@bradysolaem2467]

Its all about that court tv son. " your front row seat to justice" 👁

[@kentuckytrapper780]

52 years old, still learning. Great info thanks.

[@mrpete222]

👍👍👍

[@theoldsaltminer]

Thanks Mr Pete. When I was a kid my Uncle lived with us. Since he was a bachelor he could afford nicer thing so when color .television came out in the early 1960's he bought one and we all enjoyed it. Well the crazy thing would magnetize the screen if you looked at it cross eyed. It was a common problem with early color TV. The colors would appear all scrambled. To fix the problem we had to call out the TV repairman ( a specialized field) and he would take a giant electromagnet coil and swipe the front of the screen. He was demagnetizing the screen. It was such a common problem that he taught me to do it. The old salt miner.

[@mrpete222]

+theold saltminer THANKS for watching!

[@toddanonymous5295]

Mr Pete. One correction. It wasn't us, it was you that has made your channel such a great success. It is a loss to students when teachers such as you retire. Thanks again for sharing your vast knowledge and experience with all of us.

[@mrpete222]

+Todd Anonymous THANKS for watching!

[@MIGASHOORAY]

I,m 74 yo now and love your videos,keep it going.

[@mrpete222]

Thanks for watching

[@jimmilne19]

I'm one of those enjoying your videos. I'll be looking for a used motor for my de-magnatizer. I watch no TV, only KZbin for learning and I am so thankful for the many educational videos out there, for free! Thanks for what you are doing. Much appreciated.

[@mrpete222]

+Jim Milne Thanks for watching

[@dalegriggs5392]

Mr. Pete, Enjoyed the video on making a demagnetizer out of an old motor. Seems like every tool I pick up anymore is covered with swarf so I’ll be making one soon out of one of the dozens of motors I have accumulated. As for watching TV I seldom do that either. I lost much of my hearing due to VC mortar blasts in Vietnam so I have difficulty with dialog. It is only with the aid of special headphones I can hear and understand your U Tube videos and that is enhance by the lower tone of your voice and the absence of background noise in your productions which I greatly appreciate. Some of the yayhoos on there insist on playing their favorite tune on the radio while trying to communicate at the same time or they are trying to use a smartphone to make a video. I appreciate your quality videos and no nonsense approach. Also your commentary on various subjects and things we grew up with are refreshing. In other words, “Don’t stop talking about your experience with things!” Dale from Decatur

[@mrpete222]

Thank you, make one for yourself

[@seymourwrasse3321]

agree 100%, , watching interesting videos and even learning something new, in my 60's is way better then most tv shows

[@mrpete222]

Thanks

[@jkack53]

Thank you so much Tubalcain for all of your videos. When I enlisted in the Navy in 1970 they made me a Data Processing Technician and after my discharge I made that my career. However, after viewing many of your videos I would have preferred to have been a Machinist Mate.

[@mrpete222]

Thanks for watching!--start your new career now!

[@CCPANHEAD]

Well done! Straight Forward and basic information. Thank you

[@leonardedgarsr2014]

Keep on ramblin', Mr. Pete..I could watch your videos all day..

[@mrpete222]

🤙

[@devers6]

Great video - I always wondered how demagnetizers were constructed. I used to use these as magnetic tape erasers when I worked in broadcast. One tip for complete demagnetizing is to push the button while you hold the magnetic object at arms length, then move the magnetic object slowly into the field, move it around a little, and then slowly take it back out to arms length again before releasing the button. The 'spike' in the field when first energized and when it collapses when power is removed is strong enough to re-magnetize the object unless it is well out of the field. You might not notice the effect on a screwdriver, but you could sure hear it on reel to reel, carts, and cassettes if you did it wrong. There would be a periodic 'whump-whump' in the audio that novices could never get rid of until they were shown the right way to do it.

[@mrpete222]

+devers6 THANKS for watching!

[@StanErvin-yo9vl]

​@@mrpete222 Very handy for a set of nutdrivers and long screwdrivers or extension tips for deeper holes.

[@nickfox6339]

Hello Tubal I’m old and in my recliner and I enjoy everything you do and talk about. Blessings to you

[@mrpete222]

Thank you for watching. I'm sitting in my recliner right now, it's so comfortable I may stay there all day.

[@Tranartz]

Thank you for your videos. Nothing is an absolute failure if we learn something from it.

[@mrpete222]

+Tranartz THANKS for watching!

[@mycompasstv]

General Electric had many branch plants in Canada, mostly in Ontario, which manufactured a myriad of electrical motors for the Country. Canada of course runs on 60 cycles just like our American cousins. Great post, very useful, thanks!

[@mrpete222]

+mycompasstv THANKS for watching!

[@jesperlowinger]

Hi mr pete! I am 22 years old from sweden and have started to do light machining at home :) I always go to your channel when i need help and im glad to find this video! Im gonna go and sacrifice a motor now and hopefully my wrenches will go back to "normal" Kind regards - Jesper

[@mrpete222]

👍👍👍

[@hootinouts]

Tubalcain, you videos are far better than anything on broadcast TV. BTW, my demagnetizer is pretty much about the same size as yours and it works great. Magnetized drill bits were driving me nuts so I tore a spare motor apart as you did and made a demagnetizer.

[@mrpete222]

Thanks

[@QUANTUMTALKBEE]

I have found you. I love to do everything myself. Watching can be a pleasant experience, and I pick up a thing or two along the way. Thank you for sharing your knowledge with me. -wendy

[@mrpete222]

👍👍

[@AmateurRedneckWorkshop]

I feel the same way about choosing between tv and videos made by real people. Other than the poorly done news I don't see anything on tv that we cannot do without. Thanks for sharing.

[@mrpete222]

+cerberus Thanks for watching

[@MrAndrewKayton]

Mrpete222, I am one of those wheelchair people of whom you mentioned who enjoy your show. Thanks, Cheers, Andrew in Melbourne

[@mrpete222]

+Andrew Kayton THANKS for watching!--sorry about the chair

[@ramosel]

Mr. Pete, I grew up a military brat in the 60s and 70s and I remember my mom getting a sewing machine when we were overseas with motors very much like the GEs you had there. Since most of our overseas locations were 220v 50Hz, we always had 220 to 110 transformers scattered about the house. Worked great for the non motorized devices. But a lot of the items we got at the BX, would come with a 110v 60Hz motor too so when you got back to the States you could swap motors and use the same device. I guess it could be deemed a selling point for the GIs who didn't want to buy something that would be useless when they went home.

[@mrpete222]

+ramosel Thanks for watching--good explanation

[@anthonynagy8791]

Great comments - love the rambling!!!! Been there done that with and without a backup plan .........but I never stop learning.

[@mrpete222]

+Anthony Nagy THANKS for watching!

[@davida1hiwaaynet]

Thanks for the info on making the Magnetizer / Demagnetizer. I have not done this even though I work with motors daily.Those first two little GE motors are likely nearly 100 years old. It is a split-phase induction motor, however the powered windings and the start/run centrifugal switch are on the rotor and the "squirrel cage" winding is part of the stator. The brushes ride on a "slip ring" to transfer the AC power to the rotor.I hope you decided to save those motors. They are very rare and possibly worth a lot more than $5. I have done many videos on single phase motors and motor theories. I plan to do a video on my GE wound rotor motor. Not sure if mine is the same exact size as yours, but one of my end bells is missing a foot and I hope to find a new one some day.Like you; I also watch You Tube videos instead of broadcast TV. I love to see what someone posted because they are passionate about it and not because that's what the corporate agenda says they should show. I look forward to every new video you post, because they are all entertaining and educational.

[@mrpete222]

+davida1hiwaaynet THANKS for watching!

[@richardcooper38]

very interesting. I learn more here on KZbin all the time. thanks for sharing. I'll have to remember this little trick.

[@mrpete222]

+RC THANKS for watching!

[@bendavanza]

Very cool indeed. I will make one for myself, as it will be a useful tool in the shop. Thanks Mr. Pete!

[@mrpete222]

+bendavanza THANKS for watching!

[@boudreaumay3040]

Follow up on your closing statements just wanted you to know I too enjoy the youtube video's and you happen to be one of my favorites. So thank you for taking the time and effort to share your wealth of experience and knowledge the years have brought you ! My father was a VoTec. Instructor of "Electricity" He was wonderful Instructor and a Hoot to listen too ! You remind me of Him and that's a good thing ! Only one thing better would be there with you and soak up some O.J.T. Thanks again your friend through cyber space from my "Old Kentucky Home"

[@rodritz8384]

You said on the end that probably no one would build one on these. I am absolutely going to make one.

[@mrpete222]

👍👍👍👍👍

[@MrJgstoner]

I'm currently sitting on a pile of old water pump motors I'm looking for uses for and learned a good deal from this. Thanks again

[@MattsMotorz]

Really a great video. I absolutely will make one of these as I have a spare motor and lots of magnetized tools that are so annoying! I also completely agree that watching KZbin is much more pleasurable than watching TV!

[@mrpete222]

+MattsMotorz Thanks for watching

[@garyc5483]

Many thanks for this mrpete. I am going out to the workshop tomorrow and dismantle an old motor I have. I bought a box full of taper shank drill bits some time ago so and they are all magnetic but not for much longer. regards from the UK

[@mrpete222]

+Gary C Thanks for watching

[@TrojanHorse1959]

Perfect, thank you!! My magnetizer/demagnetizer up and walked away from my shop a while back. I wanted another one, but they have gotten quite expensive since I got the last one. This will come in handy so I can build me a new one. One thing you might mention is that to magnetize something you leave it inside the coil until you turn off the switch. To demagnetize you pull the item out of the coil while the switch is still on, or that was how my other one worked anyway.

[@mrpete222]

That is a good advice

[@jaimevega4370]

Good video Mr. Pete. This series is proving to be very interesting and informative. Thanks.

[@mrpete222]

+jaime vega Thanks for watching

[@CHIJBS]

We have a de-magnetizer at work that one of the 'old' guys made back when i was just starting, (and i've been there 37 years now) that has a light bulb wired in the circuit. It works great, although there have been times I wish it was a bit larger. I use it a lot to de-magnetize my calipers. thanks for the video!

[@mrpete222]

+CHIJBS THANKS for watching!

[@ronitsingh85]

I picked one up at an estate sale, these are from early 1900 - 1925 I believe, Mine runs great and is 60Hz, 110 VOLTS, I replaced the brass bushings with needle bearing ones. Placed an eye bolt ontop for a scale look, these are sure beauties and look like the vintage old huge motors used in the early half of the century. all cast iron. Also raw smaller GE motors have same type of starter and running coils as the Delco motor, the centrifugal switch is on the rotor itself behind the contact plate, its a lever switch that is hinged and spring loaded, very neat, I do appreciate the old stuff, they were ingeniously made and so well crafted. I have mine sitting at my table on 2 blocks of oak wood salvaged from a treadle sewing machine cabinet

[@mrpete222]

Awesome, thanks

[@bbutcher85]

Thanks for the tip. I have watched many of your great videos. One comment on the significance of 50Hz vs 60 Hz, that explains where you can get into trouble with motors and/or transformers. Consider a wire wrapped around an iron core with a DC voltage switched on. This is an inductor, and the current will begin increasing at a rate (measured in Amps per second)determined by the voltage and the inductance (I = V*T/L), in a nearly linear manner with respect to time. This creates an ever increasing magnetic field in the iron core, which will eventually become saturated magnetically. When that happens, the inductance of the coil will quickly decrease from the iron core value towards the air core value, causing the current to increase much more rapidly, leading to heating of the wire, circuit breaker tripping, and possible damage. The time required for this depends on the type and amount of iron in the core. When using AC voltage the polarity reverses on each cycle, and the current begins to increase until the voltage reverses, then decreases and reverses until the next voltage reversal. A motor will be designed with the proper amount of iron to avoid saturation when operated at the design voltage and frequency. At a frequency of 60 Hz the voltage reverses every 0.167 seconds, but at 50 Hz it takes 0.2 seconds to reverse. A motor designed for 50 Hz will work just fine at 60 Hz, although might be a bit heavier than necessary. On the other hand, a motor designed for 60 Hz may begin to saturate when operated at 50 Hz and the same voltage, causing overheating. Many newer motors and transformers are rated for 50/60 Hz and have enough iron for the lower frequency.

[@mrpete222]

+bbutcher85 Thanks for watching.--you just went way beyond me

[@trumpnut]

Another great video and another shop tool to build. Thanks Pete.

[@mrpete222]

+trumpnut THANKS for watching!

[@PeterWMeek]

Amen! about broadcast TV. I've been off it for over a decade now. If you want a break from reading, KZbin Machinist videos are just the thing. When magnetising, you may have to try several times. It depends on what part of the 60 Hz cycle the coil is in when you let off the switch. At the peak it will magnetize; if it is near the crossing point from positive to negative it won't magnetize much. Try and test the results; repeat until you get good attraction to small iron/steel material. If the magnetic polarity is important for some reason, you may have to try it many times before you get strong magnetization of the correct polarity.

[@mrpete222]

+Peter W. Meek THANKS for watching!--wish we had more readers

[@murraydalziel4701]

Just made one from an old electric drill. A you say great for demaggin watchmaking tools. Thank you from Scotland.

[@ChipMaker1066]

Now I finally have a good use for at least one of the old motors taking up space in my shop. Thanks for this!

[@mrpete222]

+ChipMaker 1066 Thanks for watching

[@fabone8887]

you are the shop teacher, " of our dreams" keep up the good work.

[@mrbakerskatz]

Thanks Mr.Pete. I'm one that enjoys all you do and I hope the "Safety Sallies" don't cause you any trouble .

[@mrpete222]

+mrbakerskatz THANKS for watching!

[@crazymanmichael8386]

thanks for this vid as it gives me the immediate solution to a problem. i have the motor and a number of tools which need demagnetizing.

[@crazymanmichael8386]

+crazymanmichael p.s.: couldn't agree more about broadcast television!

[@mrpete222]

+crazymanmichael Thanks for watching-glad it helped

[@davidlong2691]

First off, great video! That first motor is considered a commutated "universal" motor. At the turn of the century (~1880 all the way up to 1930 or so) many household motors were universal motors because they could run on both AC or DC depending on your local power considerations. They still exist today, and are somewhat common in kitchen hand blenders, wall plug drills, and other high speed tools. They are moderately cheap to produce and exhibit high torque at low speeds, which is ideal when using big drill bits or large diameter mixer blades. However... That is still an unusual universal motor because those are probably embedded permanent (ferrite or steel) magnets in the stator. Permanent magnets were rarely used in motors past the 1920s because they lose magnetism as the tool is used (but would probably work better now that we have stronger rare earth magnets). Modern universal motors have commutated armatures on the rotor and an electrified field winding on the stator. For the most part, induction motors are far more common nowadays because they are cheaper to produce and are less prone to failure (no commutating brushes). The second motor you showed is indeed a squirrel cage split phase induction motor, as you already knew.

[@mrpete222]

Thank you David. That was an interesting lesson on motors

[@junglejammer1]

Very interesting Mr. Pete. Thank you. I had seen one built from an old phonograph motor but of course, the hole was much smaller. This size would be a lot more handy.

[@mrpete222]

+Dave Lee THANKS for watching!

[@leonardedgarsr2014]

Reminds me of one I made at least 40 years ago Lyle...I made a "form" for it out of sheet copper and wound hundreds of turns of lacquered wire around it, wrapped the contraption with black plastic tape...and I still have it ! But I also have one of the fancy manufactured demags as well, now that my "ship has come in"...when you need it...you need it !!!!

[@mrpete222]

You were right, when you need it you need it

[@tomherd4179]

Another TV comment - I fully agree with you! Your videos are informative, and even if not used by me cause me to learn and think. Very seldom after watching a TV show do I come away with knowing more that before it started - no so with you. Thanks

[@mrpete222]

thanks

[@andywander]

From my 1921 GE catalog: Type SA single-phase induction motors differ from the conventional design of induction motors in that the squirrel cage or secondary winding is made the stationary member and the rotor the primary element. This type of design together with the skeleton frame design used in Type SA motors offers may advantages such as minimum weight for maximum capacity, better ventilation, hence lower operating temperature, smaller physical dimensions and greater accessibility for inspection. Type SA motors are made in sizes from 1/20 h.p. to 1/4 h.p., inclusive, and are being successfully used for a very large number of motor applications requiring a motor of constant speed and a starting and maximum torque not in excess of 200 per cent of normal full load torque. In my 1930 GE catalog, your 29954 motor was priced at $12.40. That's equal to $177.65 in 2016 dollars......

[@Bronco541]

12$ is now equal to177$ ...boy that's frustrating

[@garbo8962]

Years ago when the CRT picture tube was the only thing guys had special screwdrivers that could not be magnetized that they used for alignments. Put together a 25" Heath kit color TV together back in the 1970's that had a coil around CRT picture tube to what they said was to degaus i ( demagnetise ? )t every time TV was turned on. Thanks for another great vid.

[@MarkSWilliams27]

Thanks, Mr. Pete. You have a great voice! Very informative as always.

[@allannoyes4560]

interesting auction find hope to see some more road trips

[@mrpete222]

+Allan Noyes THANKS for watching!

[@porksboy]

This will serve me well. I am a mechanical watchmaker professionally and use a demagnetizer daily. The one on my bench is a tunnel type and at least 100 years old. I use it because it works better and is stronger than any modern one that is available. On occasion I get a watch sent in that has either been exposed to an MRI or perhaps there is something going on when the watch is shipped to me. It is rather difficulty to remove all the magnetism from the watch even with my demagnetizer. I will look out for a motor to cannibalize for these watches. Thanks for the info and great videos with useful information. By the way I was taught in school that the proper way to demagnetize was to insert the item into the tunnel, press the switch then pull the item straight out of the tunnel about three feet.

[@mrpete222]

+porksboy This should work well for you with watches. Thanks for the procedure on how to use it.

[@77goofyguy]

Thanks for putting this up. I'm in the process of building a demagnetizer for some jewelry tweezers that are driving me crazy and I did something about the same with a heater unit's blower motor. I didn't know about the speed switches for the start and run windings before this, thanks much for the information...

[@mrpete222]

👍👍

[@inthelandofmilkandhoney457]

19:04 I wish I would have had a Shops teacher like you Mr. Pete. Learning would have been a lot easier and more enjoyable. I had a Crusty old Scotsman. I would have given you even more accolades but I just noticed that you haven’t answered my question from two years ago. I still Think your pretty cool 😁

[@mrpete222]

😀😀

[@N.Cognito]

Thank you for this video! I recently saw where another youtube creater (I think it was Ave) mentioned a diy demagnetizer from a motor. I was curious as to how to make one, I made one right after i watched this video. very useful information.

[@mrpete222]

+Eric Skinner Thanks for watching

[@Dan.Whiteford]

That's just simply brilliant, Thanks for doing this. By-the-way our mains electricity in the UK is 50cycles and 240v domestically.

[@mrpete222]

+Dan Whiteford Thanks for watching

[@harshnavale7094]

I wanted to demagnetize a Stainless Steel wire. This was very useful. Thank you

[@VinceSaluto1]

Thanks so much for this video I have a number of tools that are magnetized and was thinking of purchasing a demagnetizer but now I will make my own thank you very much.

[@mrpete222]

+vince saluto THANKS for watching!

[@frankwolfe1524]

Great video...I definitly can use a demagnetizer...Magnetized toolbits, drills and taps are such a nuisance... By the way, here in Canada we use the 60 cycle per second frequency on everything AC, we switched from 50 cycles back in the late 50's... A lot of those old fridges and wringer wash machines in those days still ran the 50 cycle motors on 60 cycles with no problems except they got a little hot... But remember when they bake the enamel on motor windings the teperature is usually over 400 degrees F...Thanks again,Frank

[@Mike-pc2xl]

I've been of the impression that the AC current had to be in reduction as the magnetized piece was drawn through the coil set. We had to do this to degauss a steel aircraft control column after it flew through a bad storm (in its magnetized state, it played hell with the mag compass). We used our shop welder, coiling the cable around the column. We then powered up, and reduced the current as we pulled up, over the column. We had to do this a few times to get minimal magnetization. Perhaps we were wrong in that we didn't need to reduce the current?

[@mytmousemalibu]

Nice little project! I might actually build me a degauser like this! I work in aviation and we don't want magnetized tools because they can magnatize ferrous parts and that can effect the accuracy of the plane's compass. Sometimes it would be nice to magnatize things too. Keep up the great work! Like you, I'd rather watch youtube videos, I hardly watch the TV anymore.

[@mrpete222]

+mytmousemalibu Thanks for watching

[@BigMjolnir]

Thanks, Mr.Pete! I heard a similar rhyme to yours: "If ifs and ands were pots and pans, there'd be no work for tinkers." -- Mike

[@mrpete222]

+BigMjolnir Thanks for watching

[@godfatherbones]

This just made my day! Thank you!!

[@mrpete222]

+godfatherbones THANKS for watching

[@asroneightyseven3854]

Hey thanks for posting this. I need one of these and I had no idea it was this easy. Now I just need to find the parts and make one.

[@cyrex686]

That was neat to watch, didn't know it was so simple. I'll bet the principles behind it are less then simple.

[@mrpete222]

+cyrex686 Thanks for watching

[@tomfaessler6072]

Thanks for making the trip to the Florida Flywheelers event.

[@mrpete222]

👍👍

[@oldfister7460]

many thanks for the lesson, I really appreciate your knowledge.

[@bdrrogers]

In a previous life, I used to do inspection of aircraft and auto parts with various methods, including magnaflux. To test a part for cracks with magnaflux, you have to induce a magnetic field into the part or make it magnetic, and then cover it with iron particles (usually fluorescent to image with a blacklight). Any crack in the part (defect) causes the magnetic field to exit the part by having to jump the crack. This would attract the iron particles and indicate the position of the crack. To magnetize a part, I would use DC current and leave the part in the circular electromagnet long enough to magnetize it. After testing I had to demagnetize the part by inserting the part into an AC coil, turning on the current, and remove the part slowly while maintaining the current flow until the part was quite far from the coil. Interestingly, there are two types of magnetism you can induce in a part. If you set up a DC coil, and insert the part (like a screwdriver) into the coil, you are inducing longitudinal magnetism. If you pass DC current through the part, you induce circular magnetism. The difference between these two types of magnetism is that you can best detect cracks which are perpendicular to the direction of the induced magnetic field. If you want to detect a crack you would create by bending a screwdriver (perpendicular to the shank), you would induce a longitudinal magnetic field. If you wanted to detect a crack which runs in the direction of the shank, you would induce a circular magnetic field. In the end, you always had to demagnetize the part you were testing. Another method for using magneflux is how you would find a crack in sheet metal or any flat steel surface. In this case, you would the electromagnet equivalent of a horseshoe magnet. If you stick the electromagnet to the sheet metal, the induced magnetic field runs between the poles and you can check for cracks which are perpendicular to the field.

[@Kyledose619]

Thanks for the show! Will be making one of these dudes to demagnetize a Mini Cooper intake camshaft pulse generator wheel that is making a fuss with the square wave signal.

[@josevieira2205]

Hi there Mr Pete, the 1st motor you shown is exactly the same as the one you did your project with! It's still a squirrel cage motor but turned inside out and is common to see them in extraction fan, there are even 3 phase versions for industrial use, they can also be found on ceiling fans like the ones we used to see on restaurants, pubs and living rooms. and a tip the wires of the starting winding should be isolated because if you wire a volt meter on them there will be a voltage and will be higher than the input voltage, the reason is that you just build a inefficient step up transformer, also the voltage wold only hurt any one if both ends of the coil were touched at the same time. thanks and continue the good work.

[@mrpete222]

+Jose Vieira Thanks for the info. You know al0t more about motors than I do.

[@vinsavmom]

I agree with you on broadcast TV. I am disabled and can't do much anymore, Thank God for You Tube.

[@mrpete222]

+D. Scott Thanks for watching

[@itzik4x6zh]

You learn so much more watching you tube video,s. Thanks for posting.

[@mrpete222]

+Itzik Merkado (4x6zh) THANKS for watching!

[@llapmsp]

Don't worry about the nay sayers, if we don't try things we don't learn. I really enjoy your videos.

[@tiaandbuster]

thankyou sir for your wonderful videos . they are very informative and entertaining . i am a furnace man by trade for 43 years and also an electronics technician and i love to tinker with stuff like this among other things . i just subscribed to your channel short time ago , so i'm trying to play catch up .thanks again from nova scotia canada for the great videos and keep them coming .

[@mrpete222]

+Lloyd .Haight Thanks for watching--glad you like the videos. You have 600 to go,

[@tiaandbuster]

wow 600 videos ..... it'll take me some time , but i'll eventually get there .....

[@MaturePatriot]

I save the cord off anything I discard that has a, good quality, grounded factory cord. Always a use for good cords. Always have tools that need to be magnetized for installing screws or nuts in tight places, but don't want them permanently magnetized because of the grit they then pick up. I have a small motor that I think will work well for this. Another great video.

[@OleGramps53]

You gave me a project for for a few of my old electrical motors!

[@mrpete222]

Great

[@kerrywil1]

Thank you again for the video. Very nice

[@BleuJurassic]

great video you always teach and make good points

[@mrpete222]

+Bleu Wolf THANKS for watching!

[@Grantos1ea]

Thank you Mr. Pete. I always wondered how that worked.

[@Ribbitmefoot]

Great tutorial once again Mr Pete222. Cheers

[@mrpete222]

+Ribbitmefoot THANKS for watching!

[@Ribbitmefoot]

Regards from Dublin in Ireland :-)

[@Lactuca]

hot little project. I'll have to make one. Thanks!

[@mrpete222]

+Lettuce Thanks for watching

[@RichardDKneller]

I agree wholeheartedly with your closing remarks albeit my wife claims I tend to nod off when watching!

[@mrpete222]

+Richard D Kneller Thanks for watching

[@daveharriman2756]

This is very interesting, and an enjoyable watch, I would dearly love one of these in my shop, especially for my digital calipers, but to be honest, I don't feel competant enough to mess with electricity, so thanks for the timely safety warning...know your limitations! cheers, Dave

[@graemebrumfitt6668]

I was going to buy one of these from ebay but will now make my own! TFS, GB :)

[@a-yates]

I like the name plate on that motor looked like it had an oiler on the plate as well pretty neat the way they used to make things to be ran and ran and ran some more Also made me smile to hear you say if and buts were candy and nuts everyday would be christmas reminded me of my grandparents grew up learning lots of sayings from my grandfather. He spent most of his youth F.u.b.a.r ed lol great video as usual

[@kevinwillis9126]

thank you sir you always deliver a great video.. thanks again ....

[@mrpete222]

+Kevin Willis THANKS for watching!