Surprising Trick to Magnetize Aluminum - Dynamometer
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- Опубликовано: 4 окт 2024
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Great to have you back! I don't think people are mad at you for not uploading.. I think people are like "what's this thing I don't recognize in my video feed".. a few years is a long time for the yougins..
Haha very true. I was exaggerating for sure.
This is even better the second time it was uploaded.
I got some constructive criticism that the music was excessive, and decided to fix and re-upload.
Thanks for the edit, my old ears don't edit out voice from music that well anymore. Its great to see another video from you, happy christmas etc.
I greatly appreciate the feedback! happy holidays!
Oh man people do this so often and I never understand why. If people are watching your video they are already interested - why drown out your voice with music, rendering the content inaudible|!? Never makes sense to me. Glad I got to hear the fixed version.
4 years is a long time, maybe a lot of people are just not watching the same things they were 4 years ago. I however will always be watching maker content and am glad your back.
Thanks!
Welcome back!!! I'm so happy to see you back!
Thanks Man!
I don’t know why I’m subscribed to you. You must have made something cool in the past I don’t remembered.
Was it the 3.4 Trillion to 1 gearbox?
Lots of neat multi gear transmissions etc.
@@metricstormtrooper Good to see you came back! did i do better on this edit?
@@GearDownForWhat that was it!
@@GearDownForWhat This is an interesting video. I’ll definitely watch the next part.
He's back!
Nice job, love the data driven experiments. Thanks.
Glad you liked it!
😊Glad to see you are back
Did you think about describing the problem using a differential equation? I just remember, it was annoying, but on the other hand, I would be interested how much it aligns to your experiments. Maybe, I should pay more attention in the videos of the Hyperspace Pirate. And it might be only me to be interested in that, because actually calculating that is on my todo list since it was a question in an exam of mine more than 13 years ago.
I think you think i'm smarter than I think I am. 🤣
When your new videos hit their feed. They're reminded that they're subbed to you and that they no longer care about engineering so they unsub.
We are so back!
9:51 This sounds like one of the problems tackled by steam trains.
While there will be differences between hot 200psi steam that can condense and 40psi compressed air, I can give some pointers as a non-expert
For the max power you want to admit air until the end of stroke (a long cut-off)
For the max efficiency you want to quickly admit just enough air to expand to exhaust pressure (a short cut-off)
Steam engines varied this on the fly, starting with max power and trimming down the cut-off to use as little steam as possible
Another thing steam would do is let air in just before the start of stroke (lead) to cushion the stop and decelerate the piston head. This I don't know if this helps or hurts efficiency but it did help reduce wear wear and tear, especially at high speed.
A key difference in locomotives is they needed the piston exhaust pressure to do other work, in this case you can use all the pressure
Again, I'm not an expert, I don't know much about the effects of temperature ad temperature change, but I would trial:
- Adding some way to change cut-off on the fly
- A small lead on air admission
- Find how little cut-off the engine can run with, Ideally independent of pressure
Looking forward to the next update!
5:43 About subscribers, you might have people who had forgotten the channel and once they were reminded by your upload they chose to unsubscribe.
I for one am glad I was subscribed, it was a great surprise when you first uploaded again
Thank you for the insight. What you describe is what my intuition leads me to believe as well.
I would recommend against having the second magnet disc. In the best case, it won't do anything, and in the worst case it'll add a spatial pulse to your data artificially limiting your potential resolution.
True.
You are back!🎉
The loss of subs could be caused by people forgetting about you because of the hiatus and then getting your first new video in their sub box.
That one was kinda rough quality wise. Keep uploading and it'll sort itself out
I should have done better. I was not focused on making a good video but instead focused on making a working engine. This has always been my issue, I prefer to spend more time on the project than the video.
@@GearDownForWhat It's ok, this video is also way better. I was not trying to put you down, just wanted to figure out why.
That is only the second video since you came back, isn't it? I always hoped for new videos. Did you just not feel like making videos in the meantime?
P.S.: I tried to build homepages and edit videos and I think I have already done interesting projects. But I never managed to do all at once. There was only time for the project or for filming it or for working on a homepage. So I understand, that tasks like finishing university while living in a small flat makes finishing a youtube video about a project very, very hard.
I was chasing dopamine elsewhere for those years. I went to go work for Tesla for a year. I remodeled a house and moved into it. I started an electrical contracting business. I’ve just been busy doing other things.
@@GearDownForWhat Every single occupation you had sounds cool. Does electrical contracting mean you did electrical work in buildings or was it more like industrial consulting and engineering support? I would be really interested in the engeneering, but if it was "just" doing normal electric, I can imagine that it is a way to learn how to set prices, run a business and work with people you have to tell how to get the job done.
Electrical contracting is wiring houses, commercial facilities and industrial facilities. I do all of it!
I fully expect that the magnets behind the aluminum disc will be mostly neutral as when the magnets are oriented the same way as the spinning ones it'll pull flux through the disc but when they are opposing it'll push the flux out of the disc. I think all you've really accomplished is creating cogging.
That is a good assessment, i wonder if the losses of turning all the magnets the same way would be overcome by not pushing the flux. i suppose it might depend on spacing?
@@GearDownForWhat in my head I automatically jumped to the conclusion that they were alternating. It hadn't even occurred to me that they might all be facing the same way. I'm not totally sure what to expect in that case. It may almost treat it as if there's not a moving magnetic field and create no drag. But I honestly have no idea. Edit: Even if they were all facing the same way the length of the flux path would be constantly be changing and still create a varying flux in the aluminum disc. I still don't know what the effect would be though.
Did you zero the load cell with that arm sitting on it so it doesn’t portray that weight as part of the torque measurement
yes sir! but the weight of that plastic arm is quite small, just a gram or two.
There are several potential reasons for losing subs and it's likely a combination of all of them to some extent. People's interests can change so it may take some time before you start finding more new people than losing old ones who are being delivered content they no longer like. I could be wrong but I remember your last few videos having better production than this one (specifically better audio and editing will go a long way), quality over quantity seems to be working for a lot of the youtubers I watch these days. Related to the last, the landscape has changed. There are far more good youtubers making videos in this space that I've discovered within the last 4 years, competition is likely affecting people's decision to stay subbed or not.
I'd recommend getting a better microphone and invest in some noise isolation (or just invest more in your set/workspace in general), hiring an editor (if it all feasible), getting a camera on a different angle and/or adding an intro/outro so we aren't just looking at the same table the entire video and taking more time between videos to polish them more and show us more of a complete project than just a snippet. Just my 2 cents but those are the kind of changes that seem to get a lot of mileage for other youtubers these days.
I likely will at some point, I made some decisions to help set me up later in life that involved buying a smaller house and letting someone else live in my bigger house, resulting in the loss of my studio room. I am an electrical contractor now so i have as much free time as i want, and just need to find myself a studio type place.
5° past tdc
dont use chat gpt. havent you notced it simply either reinforces what you already know, or gets it utterly wrong?
its goal is to write legible sentences. not CORRECT answers.
so. you make more power by pushing air in the full stroke, PLAN, pressures*area*length*number... but it isnt more efficient.
air is fun but the compression ratio, the air supply pressure, and the timing all interact to a certain degree...
say 120PSI. a clearance of 1CC. timed to TDC only.
you push in 8cc of air. 120psi is about 8bar.
(piston at TDC can produce no torque, BTW. ALL engines have this major mechanical disadvantage?)
as soon as the piston moves enough to double the volume, 2cc, its obviously also halved in pressure (keep it isothermal! lol. dont confuse yourself with thermodynamics yet?)
so has the force on the constant area of the piston. but the crank now is producing torque...
double it again... 4cc, and its at 30 psi. half the force again...
and finally, another doubling, 8cc...
at this point its at atmospheric and has no desire to vacate the cylinder?
assume the exhaust closes again at bdc... "instantaneous valves" for this mental model...
then you recompress whats in the cylinder, to fll the clearance volume... and no new air can enter. this sounds like a disadvantage. yet its actually the most important factor for efficiency.
holding it open after TDC uses more air, but the higher cylinder pressure can apply more torque. the volume doesnt increase so drastically so the pressure remains higher for longer...
at 40 psi you only have 3:1, less... fairly late inlet closing and exhaust almost to TDC... which you cant do with plain ports.
minimal clearance volumes. the exhaust closing determines the actual CR. supply pressure and degree of expansion governs inlet opening.
lol, this was about dynos. nice effort. janky :)
steel disc on the back of the magnets. cancels out the unused side, the projecting poles do the real work here... alternating polarities, of course... dont think you mentioned that.
small gap between each magnet as that is where the majority of eddy current and work is performed in the conductor. if its too small the currents get pinched too much, start overlapping the magnet itself and reduce in intensity.
not an issue with a mosquito-fart of power!
so... varying the gap with permanent magnets obviously changes the flux and the force.
using electromagnets you can get the flux to only cut the disc, with a very efficient magnetic circuit (iron!)...
much stronger, but obviously requires a variable power supply to excite the coils...
you have three measurement methods to verify results...
temperature rise due to I2R heating, current through resistance.
torque/rpm
and using electromagnets... the excitation currents.
You're doing great, just please please please don't ask chatgpt for engineering advice. LLMs are useless for this sort of thing, they're just stringing together related words. I gurantee you know better than it does.
It does surprisingly good!, sometimes when it makes an issue if i don't feel like troubleshooting it i will just tell it what the serial print data shows and it will fire off a good fix. I will generally put Chat GPT 3.5 up against Chat GPT 4 to check for errors and between the two of them they do very well.
Regarding your subscriber count... Try to refrain from anthropomorphizing the algorithm.
Like the old Top Gear, ambitious but rubbish! Good show ol boy!
Thanks!
I want to subscribe just to unsubscribe now
Just start with the first bit
@@GearDownForWhat I guess, he doesn't know what he is missing. I always had the problem to find the correct gears for the job during my childhood. Now, I think 3D printing brought me to your channel and I would have ended up here through multiple path. Not only 3D printing and gears. Even when looking for Fusion360 plugins your channel is referenced.