Making some laminated, precision ground magnets for the shop. Project Link: gtwr.de/projects/pro_toolmaker... Web: gtwr.de/ Instagram: / stefan_gtwr
Пікірлер: 127
@elzeno24147 жыл бұрын
"You know the story. Sitting in a corner. Crying." Please make shop t-shirts with that on it. I'll buy a couple.
@tvsinesperanto74463 жыл бұрын
I tried that. I ended up sitting in a corner crying.
@Watchyn_Yarwood7 жыл бұрын
That must be the shortest 24 minute video I've ever seen! Anxiously awaiting part 2.
@robmckennie42037 жыл бұрын
I'm already coming back to watch this a second time, I need part 2!
@iaahner4 жыл бұрын
"Sticktivity" is my absolute new favorite word. I'm stealing this for sure. :D
@juanrivero87 жыл бұрын
Very good discussion of flux lines in a laminated magnet. Never heard of those magnets in Engineering school, but it makes sense to me. Saving part 2 till tomorrow. Machining, as usual, magnificent.
@josh1804josh7 жыл бұрын
Excited for part 2! Nice video. Love any project that involves the surface grinder!
@Smallathe2 жыл бұрын
Awesome! Wonderful DIY magnetic brick. Loved the drill bit edge grinding tip! I will use that one for sure!
@tuffymartinez7 жыл бұрын
I appreciate the way you think, explain and generally work in your shop....Thank you for your project...tm
@andrewdolinskiatcarpathian6 жыл бұрын
Very engaging. Pure joy to watch and to learn from. Thank you sir.
@lorenlieder97897 жыл бұрын
Good video Stefan and a neat little project keep the videos coming.
@thatoldbob79565 жыл бұрын
To the man of infinite patience: Now I know how these magnets work. Thanks.
@centurialinc7 жыл бұрын
Very cool project Stefan! I might have to make one or two, have a good cry and then make some V blocks as well :). Keep them coming and I'll keep watching. Best Matt
@AmateurRedneckWorkshop7 жыл бұрын
Very interesting and I am already eager for part2.
@razorworks99427 жыл бұрын
I'm smarter today than I was yesterday thanks to you!!! Going to see part two.....Razor!
@ChrisB2577 жыл бұрын
Most interesting when you add the two bits of steel - the pole fields are I guess a bit predictable but - very useful property. Never thought to try that. You are always full of great ideas Stefan. :) Love this whole project... only downside I'd have is, no surface grinder!
@lifuranph.d.94405 жыл бұрын
I'm sure you can do these jobs the old way. With a good vise, file and a square.
@MyTubeSVp7 жыл бұрын
Hey man, I was waiting for the nice and shiny finished product ! Don't leave me hanging here ! ;-)
@IronHeadMachine7 жыл бұрын
Great video Stefan
@clemwyo7 жыл бұрын
"sitting in corner crying" have you been spying on my shop? Great work, as always. Craig
@Dans-hobbies7 жыл бұрын
Excellent video Stefan, I'm looking forward to the next one.
@StefanGotteswinter7 жыл бұрын
Thanks! Next one? I just released two! Thats enough editing work for the next two months ;)
@Dans-hobbies7 жыл бұрын
Ahh, I just noticed that. That's what I get for not checking my feed often enough for new videos.
@roberttaylor23282 жыл бұрын
Love it. Thanks for your content.
@BigStew0075 жыл бұрын
Sticktivity. A great word!
@TheUncleRuckus4 жыл бұрын
This is really cool idea!!
@turningpoint66437 жыл бұрын
Very clever and well thought out. Not exactly unexpected for your channel Stefan. I think the full length pins are a good addition. Epoxy does hold well, but it's a brittle glue joint. Drop that magnetic parallel just once and you'd have a minimum of two pieces if your lucky.
@CalvinoBear5 жыл бұрын
For super strength, I recommend Loctite 331, it's a magnet bonder used in the electric motor industry. Not that this will be spinning around... but you know, you never know!
@fnordhorn3 жыл бұрын
The spring on the parrels is something I never thought of doing to hold them lightly in place
@peteferguson70247 жыл бұрын
Thanks for sharing this, I've picked up some used ones and been wondering about them.... Now I know. Take Care
@bstanga7 жыл бұрын
Holding my breath till part 2 is up..
@StefanGotteswinter7 жыл бұрын
Fortunately it did not take to long ;)
@bparsee7 жыл бұрын
Damn...I had a project lined up where I was going to machine some neodymium magnets, think I'll be giving that one a miss now! 😂
@marklundeberg70065 жыл бұрын
Yes, alternating direction stackup is definitely the way to go. (I misinterpreted the stackup on first viewing, but now I see you did it right. :-) )
@MattOGormanSmith7 жыл бұрын
Why worry about residual magnetism? These are permanent magnets you are making. Soft iron is for switchable poles.
@EmperorDevilhunter7 жыл бұрын
Great :( Now I have another project to add to my (already too long) list. Pretty nice idea! I have some epoxy putty, pretty hard but easy to machine and grind, I might try to do the same but using that putty instead of the brass. About the transformer sheet metal, it's high silicon steel too reduce the Eddy currents and hysteresis loss.
@robertkutz7 жыл бұрын
great video
@charles13797 жыл бұрын
how accurate does the length of the hole in the brass for the magnet have to be to the length of the magnet. in other words, does the magnet have to be in contact with the steel pole plates on both sides of the brass??
@ralphmacchiato37614 жыл бұрын
"Sticktivity" -love it!
@Cactusworkshopchannel7 жыл бұрын
Very interesting!
@daveticehurst41917 жыл бұрын
The 'Backing Off' of the cutting edge to prevent it "Grabbing" brass, also applies to the drilling of Perspex.
@rayp.4545 жыл бұрын
Stefan, your mismatch with the slitting saw was because you were conventional milling. If the machining setup is rigid enough, climb milling with these type cutters is always dead-on. Do a test sometime and see. Thanks for the videos. I enjoy them all.
@davidewing90883 жыл бұрын
thank you for the detail.
@Sketch19947 жыл бұрын
I can only imagine what kind of pain grinding a magnet is!
@narcoleptic89826 жыл бұрын
If you want to use two magnets per lamination, why not diagonally oppose them if you are worried about material for facing?
@Sabbatheist7 жыл бұрын
Would positioning two magnets per face as planned but positioned like the pips on a gaming die (the 2 on a dice) have helped with strength?
@simonp3477 жыл бұрын
Great idea but no shaper action? BTW I believe most modern transformer laminates are made out of silicon iron
@RobertSzasz7 жыл бұрын
Two thoughts, First, as surface finish makes a big difference in ultimate hold strength, would lapping the magnets and brass plate assembly so there is no gap between the steel and magnet help hold strength? Second, could you make some sort of tongue and groove assembly to slot the brass and steel sheets together? Perhaps you could use the shaper? (you could set up a channel like the Yule Log channel and just let us all watch the shaper do its work)
@intjonmiller7 жыл бұрын
Robert Szasz I would watch that channel all the time!!
@ratroddiesels19817 жыл бұрын
on the subject of magnetism i dismantled a deck top computer to access its modem and when i dismantled the modem there was a very strong magnet that accidently stuck itself to a metal work surface it took over 100kg of force to remove it .
@waynep3437 жыл бұрын
use transformer laminations for the steel. can come from ignition coils.. or various power transformers..
@AlfredoSwift3 жыл бұрын
Nice!
@creativesymon7 жыл бұрын
How are you finding that vice? It's the one I was looking at as it's a great price.
@kenwilliams95185 жыл бұрын
Stephen just to let you know I really enjoy your channel. In 1975 I was on a ship USS South Carolina and we stopped in Bremerhaven Germany...you have a beautiful country.
@w53p5 жыл бұрын
Once again a great explanation. Can I ask about your Toolmakers vice which appears to have a ratcheting mechanism for adjusting the moving jaw. I've had a look on the web but failed to fine a reference to this type of vice would you be able to provide any info on this vice. Thanks
@Sammus7t3 жыл бұрын
Been quite a while since you asked, but it's one of these: www.arceurotrade.co.uk/catalogue/department.aspx?node_id=deda9017-3d52-463c-b0b5-a1b701150583&ou=%2fcatalogue%2fworkholding%2fmachine-vices%2fprecision-tool-vices-type-2
@EmmaRitson7 жыл бұрын
magnets are funny things. i think two magnets in a plate would creat some interesting issues when assembling. i did a project with embedded magnets recently, and only really found out how much i dont know. lol
@StefanGotteswinter7 жыл бұрын
Your motor? That was a great project! Thats something I want to build one day too...
@tjeerdmein4 жыл бұрын
ja man goed informatief en je engels is goed dank voor al je werk
@albertmagician86133 жыл бұрын
Iron plates from old loud speakers should work nicely too.
@MJBEngineering2 жыл бұрын
Does anyone know the model number on the mitutoyo caliper? Never seen one with a prismatic way
@roguetrooper705 жыл бұрын
Can you use copper instead of brass?
@littlehills739 Жыл бұрын
if someone was motivated thoughts on two dovetails either side of the magnet for epoxy mechanical fit
@StefanGotteswinter Жыл бұрын
Thats a very good idea - And it would probably look absolutely marvelous.
@johnstrange67997 жыл бұрын
I'm interested to see you square it up. Seems you might do battle with chips magnetically clinging to it.
@Morkvonork7 жыл бұрын
If the grinding dust becomes hot enough (curie point) it should demagnetize itself by heat and just fly away. I think magnetic dust wont be a problem.
@johnstrange67997 жыл бұрын
Morkvonork Initially I thought he was going to mill it, but part 2 dispelled that incorrect assumption on my part. It ground out great.
@byronfoxretiredmachinist93007 жыл бұрын
You can buy carbide faced calipers , most tool suppliers will have them. Made by MANY manufacturers.
@StefanGotteswinter7 жыл бұрын
Thanks, yes I have seen that..and the price :)
@molitovv7 жыл бұрын
'Stictivity' Stefan Gotteswinter 2016... Really enjoyed the video Stefan, what is the brand of the end-mill you were using? Regards, Matt
@BillyTpower7 жыл бұрын
I thought stictivity was what happens after eating peanut butter...lol
@larseriksson11845 жыл бұрын
16:38 "brass has the property of being brittle" is brass brittle?
@miguelcastaneda72364 жыл бұрын
decades ago before dial calipers mitutoyo did offer carbide tipped jaws helios too special order
@Cancun7717 жыл бұрын
As a sign of respect and gratitude for teaching me the word 'stictivity', here's a small denglish mnemonic to help remember not to put 'would' into an if-clause: 'if+would=Satz kaputt'
@boelwerkr7 жыл бұрын
Interesting. I would have soft soldered the stack, bass and iron can be soldered easily with Soldering-paste (for pipework). And the magnet take no harm with the 300°C. Then no pinning would be needed i think. I did soft solder big parts on an old electric stove with an aliminium plate as flat base. I think i will make one from Galvanized iron sheets. They are often very low carbon steel and cheap. Simply soft solder stacks together and put a magnet in the middle. The zinc and tin are good enough magnetic isolation between the iron plates i think.
@StefanGotteswinter7 жыл бұрын
The neodymnium magnets are toast after beeing heated to 300°C.
@boelwerkr7 жыл бұрын
Hm. Good to know. Thanks :-)
@carneeki4 жыл бұрын
Hi Stefan, Just went looking for the webpage for this project, but it 404s with your new website, and I can't find it!
@Sammus7t3 жыл бұрын
You can find his old articles here: gtwr.de/div/webold/
@ducatista1098s2 жыл бұрын
Try letting 2 magnets snap together with the d~40mm neodymium magnets. =)
@bcbloc027 жыл бұрын
Isn't the epoxy like 3000psi shear strength? You don't think the fact it should take almost a ton of force to separate the magnets is enough to hold them together?
@barrygerbracht50777 жыл бұрын
Never trust glue. It is a very brittle bond in my experience and should always be backed up by mechanical fasteners. If you dropped them, the shock could break the bond (or just let them snap to the surface). The glue is very strong in the laboratory under static load for sure, but one light tap and it can break. It won't of course if that was the plan. Then it will stick like a SOB, but if you want it to be permanent it won't be.
@bcbloc027 жыл бұрын
Barry Gerbracht Better tell most of the auto manufacturers, many of them have been epoxying structural body panels for the last 15+years instead of spot welding because it is stiffer and stronger. I am sure the grade and properties of the epoxy have a huge effect on its performance.
@rengecko7 жыл бұрын
bcbloc02 surface prep is also critical in automotive chassis applications
@barrygerbracht50777 жыл бұрын
+bcbloc02 I think automotive epoxy is softer and a much thicker bond layer to allow for the epoxy to be more plastic instead of very rigid. I have used epoxy (Sikadur 31) to bond steel together and it is very brittle (it failed after applying the design load even though by calculation it should have had massive amounts of bond strength beyond the calculated demand). This was not some simple sticking two hunks of stuff together and hoping it works either. The surfaces were properly prepared and I had done all of the load calculations and shear flow checks to make sure the bond was adequate. No luck. A few well placed fillet welds stitched along the length and they never moved. I know adhesives are used in automotive applications and extensively in aircraft manufacturing. They are not using hardware store epoxies and will have extensively proof tested the assemblies prior to actually using them in production. I would not trust this epoxy and would back it up with some rivets. Once burned so to say...
@pierresgarage26877 жыл бұрын
All depends on the grade of epoxy you're using..........!!!! Cheap commonly available stuff isn't gonna glu anything, for serious gluing you need to get industrial products, and, those products aren't available to public. You can look into something like Miller Stephenson MS-907, I've glued parts like 30 + years ago and it still holds, you really need to hammer the parts in order to break the bond... They also have other excellent products like the ones used in automotive or aircraft industries...... ;) www.miller-stephenson.com/chemicals/epoxy-resins/
@ChiralSymmetry7 жыл бұрын
Brass is pretty expensive... Would aluminum be a possible alternative?
@MysticalDork7 жыл бұрын
In theory yes, but it's quite a bit softer (easier to mess up the surface/wear it out), it expands more with heat and (IMHO) it doesn't look as nice.
@ChiralSymmetry7 жыл бұрын
Thanks for the explanation!
@duobob7 жыл бұрын
Aluminum does work and is used for making laminated magnets. Brass is often preferred because it is often harder, less prone to scratches and dings, and is less easily corroded (all variable depending on the grades of both metals).
@ChiralSymmetry7 жыл бұрын
Thx!
@andrewgr1443 жыл бұрын
It doesn't seem like Stefan is answering questions on this video anymore (understandable, it's 4 years old!), so if anyone else can answer, that would be cool. They sell these magnets in rectangular shapes. Would those work? I understand you'd still need to surround the magnets with brass, so that you can surface grind the surfaces, but I'm curious if there's anything about the shape of the magnets that would make the "redirecting the direction of magnetic pull" trick work differently (or not at all).
@Sammus7t3 жыл бұрын
I'm far from an expert, but looking over this article, I think you could expect the behavior to be the same: en.wikipedia.org/wiki/Halbach_array Cylindrical and block shapes are considered for different sections of the article.
@dominiquewilk68947 жыл бұрын
Salut . pouvez-vous me donnez les dimensions en métrique car l' anglais bof . super vos vidéos . Cordialement
@dominiquewilk68947 жыл бұрын
salut. Je suis français. pourriez-vous M' indinquer les épaisseurs du laiton et du fer en mm, merci, car l ' Anglais ne comprend pas . super votre chaîne KZfaq . Cordialement Dominique
@mbslg867 жыл бұрын
wouldn't this magnetise the work and cause issues?
@jonnoMoto7 жыл бұрын
I'm not sure but I think the alternate field directions avoid that.
@MysticalDork7 жыл бұрын
To some extent yes, but the alternating magnetic domains mitigate it to some degree and its always a good idea to degauss your parts anyway.
@rajaramkondekar44394 жыл бұрын
Good job!!
@nicolasescobaravila79106 жыл бұрын
This has to be because I'm just a machining aficionado through videos only (for now), because I swore that brass at the beginning of the video was actually wood XD.
@derKarl_stp7 жыл бұрын
your CAD-drawing should be a PAD-drawing ;-)
@lifuranph.d.94405 жыл бұрын
It took a bit to get it. HaHa!
@moonpup62627 жыл бұрын
"sticktivity" lol, that must be a technical machinists term (3:36)
@StefanGotteswinter7 жыл бұрын
It is! :D
@henmich3 жыл бұрын
Schnellfest.... haha
@StefanGotteswinter3 жыл бұрын
Hällt in Minuten, für Sekunden. Dreckszeug :\
@snaprollinpitts4 жыл бұрын
you didn't need to machine it again, you should've aligned them as you glued them together?!!!
@altair70016 жыл бұрын
You should NOT use 5-min. epoxy, as it has very low strength. The longest-setting time epoxy will generally have the highest strength. Also, do not use "laminating" epoxy that is used for fiberglass layouts, as it often cures very hard, therefore being brittle when submitted to a shock. The best epoxy is "structural" epoxy.
@dip200007 жыл бұрын
Made in Germany
@StefanGotteswinter7 жыл бұрын
Except for the magnets themself, I am pretty sure they are China :)
@Nicap27 жыл бұрын
Yawn...
@StefanGotteswinter7 жыл бұрын
You dont have to watch it, just walk away to the newest Kardashians video :)
@danballarin6 жыл бұрын
Stefan, thank you for providing your knowledge free of charge. Some entitled people want to be entertained more than they would like to learn. I will be trying to make a set like these soon. Ignore this guy!