I like the image at 9:27 showing the Watt Balance at the NIST. Notable is the use of a disk instead of a rod in order to maintain truly constant balance throughout the "swing".
@nickp1987
8 жыл бұрын
So I haven't seen anyone else comment on this, but you appear to be a pretty good draftsman. That drawing came out looking nice.
@PracticalEngineeringChannel
8 жыл бұрын
Thanks! I've been practicing.
@atrumblood
8 жыл бұрын
It has always amazed me how well diagrams were drawn in old documents. These days it is all done on computers. yours is amazing.
@lucasburson7984
8 жыл бұрын
Have you ever taken a drafting class by hand? I am in the process of getting an engineering degree and we don't even take computer drafting; all our computer drawing is 3d modeling.
@pangpengmaster
6 жыл бұрын
That drawing is better than my Solidwork assignment.
@jxh02
3 жыл бұрын
Hey, French and Vierck! I have a whole collection of those, in numerous editions.
@robpetersen6584
3 жыл бұрын
As a retired metrologist who ran the "Mechanical/Physical" lab at Boeing in Seattle until my retirement, I no longer have my fingers in the science involved in metrology. I know that the issues you describe about the kilogram being the only primary standard not based on a natural constant, has been a topic of concern for a very long time, so this is truly a exciting development. Thanks for another great video.
@ThisOldTony
8 жыл бұрын
excellent!
@PracticalEngineeringChannel
8 жыл бұрын
Thanks man!
@Prozwolfx
8 жыл бұрын
As a Year 12 (Senior (?) year) student studying both Physics and (Systems) Engineering, this puts into perspective a lot of what I've learnt over the last year or so doing Physics. I was blown away by the application of electromagnetism in measuring mass - something I've learnt only a few months ago. This video is awesome, kudos to you, Grady! Your video just made my day :D
@KoalaKrisp1
8 жыл бұрын
The quality of your videos are stunning. Its amazing how you manage to create such great demonstration props while also balancing a full time engineering job. I aspire to be like you after I graduate :)
@joe-edward
Жыл бұрын
This is a great video! I know it's a bit older than your current content, but I love this type of science, and you teach it well. Thank you for creating!
@stanmccorkle
2 жыл бұрын
I’ve been a subscriber for years, but have only ever watched the next new video. I am enjoying binge watching your channel. This particular video was so packed so full of interesting info that I will have to watch it again before I move on to the next one. I’m grateful you are willing to share your talents with the world.
@StefanGotteswinter
6 жыл бұрын
Just listened to the common engineers episode you where featured - Completely missed this video about the watt balance, very interesting!
@GauravA42
8 жыл бұрын
Nice video Grady! Weirdly enough I really enjoyed your intro where you are drawing your design. I study engineering but have never touched any drafting tools, as it is obsolete these days, but watching you bring your design to life on paper, (and then in real life), with your hands looks so damn satisfying, I might have to try it some day. CAD just isnt as personal!
@pcfreak1992
8 жыл бұрын
These videos are getting better and better! I really enjoyed this one, especially because it is explaining something relevant that you didn't see on 100 other channels already. Keep it up!
@96tomms123
8 жыл бұрын
Im surprised by your drawing skills, its just amazing!
@BushCampingTools
5 жыл бұрын
It's a great video and as u say good to show even the "semi failures". BTW love the art in the backgrounds of these vids! I spent years doing electrophysiology and it's a never ending battle to remove noise from real signals, so for your demo here, it was pretty damn good!
@JackmanWorks
8 жыл бұрын
awesome! glad you're picking up sponsors 👍👍
@landonkryger
8 жыл бұрын
Wow. I always heard that watt balances were super expensive. That must have been only talking about the super high precision ones. I never imagined that you could build one at home.
@casacara
2 жыл бұрын
With the level of precision desired for the kilogram redefinition, I imagine it had to be made incredibly sensitive and accurate, so the level of engineering complexity was likely high, and part specification tolerance was low.
@rklauco
6 жыл бұрын
I think your videos are getting better and better. Engaging, entraining and, most importantly, more educational. Thanks!
@beliasphyre3497
8 жыл бұрын
Awesome! I work closely with the quality assurance department in my job as a mechanical engineer technician, so I know how important accurate measurement is. One percent error on a device built in a garage is impressive. I especially like the googly eyes, they always bring that extra something to a project.
@taschke1221
8 жыл бұрын
Thx so much for your advocacy. You're doing great work to give a fair shake to those less fortunate.
@CapturePlay
8 жыл бұрын
Another great video Grady! I've seen some other videos on this topic, but I think you did a fantastic job running through it at just the right pace and detail. Keep em coming!
@GadgetBoy
6 жыл бұрын
Watching the timelapse of you doing those technical drawings is somewhat mesmerizing.
@patrickpolizzi7
3 жыл бұрын
I discovered your channel week before last, I think. I am a nurse. I love science, and before nursing, I wanted to become an engineer. Thus my interest in your channel. As of last night and today I have been binge watching your channel. I have enjoyed all of the videos. I think my favorite was the episode in which you reinforced gravel with bolts (Why tunnels don't collapse). Up until this episode everything was extremely cool. However, after watching this video, all I can say is wow. This one this one really satiated my curiosity niggle. It was very enjoyable and extremely cool. Thank you for all of the work you put into making these videos.
@petarbul
8 жыл бұрын
the quality of this video is just amazing for one man operation
@robertt5992
6 жыл бұрын
What people don't realize is just about everything goes across a scale one way or another.Brilliant explanation. I've been in the scale industry since 1984 dealing with scales that had an accuracy of a nanogram to the largest capacity of 10,000,000 lbs and have always referred to the French 1Kg weight when explaining to customers how accurate their scales are and certification of weights. Now technology has changed that. Thank you for taking the time.
@LadyTink
7 жыл бұрын
The great courses plus plug at the end was actually very well done. Dozens of channels I watch have mentioned it, but I tend to click away from the video the second the video went into advert mode. I think the odd camera angle and the clips from a lecture series from great courses really got my attention. Figured I'd share this since I clicked the link :P
@oldjd7745
7 жыл бұрын
This is a true example of applying what is known about nature to expand our knowledge of nature. It shows the beauty of the human mind.
@SammSheperd
8 жыл бұрын
That was beautiful
@PracticalEngineeringChannel
8 жыл бұрын
Thanks Samm!
@AxcelleratorT
8 жыл бұрын
Great video!!! I've been messing around with astatic galvanometers and suspended coil mirror galvanometers for a few years so this project was right up my alley. Thumbs up!
@jmlundy1
6 жыл бұрын
I am a CivE/Structural and have just 'found' you via a recommendation from my son (an M.E.) and if this video is any indication, I will enjoy the rest of your offerings!
@leopoldarkham7017
8 жыл бұрын
You and TPAI are my favorite channels for making complex things sound simple. Keep it up it's really awesome!
@DTZinatbakhsh
8 жыл бұрын
Today, this taught me something pretty neat. It also taught me that balances can be adorable. Keep up the fancy videos.
@gaius_enceladus
5 жыл бұрын
Awwwwww...... nice cat at the end!
@GodlikeIridium
3 жыл бұрын
Nobody known or heard about this, but it's one of the most important scientific discoveries of the century! And it's so easy...
@RoySchl
8 жыл бұрын
i think that is the first time i see labview in a youtube video hehe
@fohdeesha
8 жыл бұрын
lol same. leave it to Grady
@JustinDrentlaw
7 жыл бұрын
I used LabView back in high school. Haven't seen or used it since lol.
@dazzershell
5 жыл бұрын
Nato Railgun prototype control room was operated by Labview, i remember that big indicators and Fire button)
@Cyberguy42
4 жыл бұрын
Labview... That takes me back
@NeilvanGeffen
8 жыл бұрын
This video was fantastic, and a great way to start the day :) Thanks Grady! Keep 'em coming!
@ddegn
8 жыл бұрын
I second the suggestion from +Don Donlee about moving the wired components off of the balance beam. I'm a chemist myself and I have a very precise balance but it's really hard to get accurate measurements do to static electricity. One trick I've learned is to use static dissipation or conducting materials. You probably want to use materials which don't hold static charges well when you get around to building your next version. You probably already know this, but when using mirrors with lasers, it's a good idea to use "first surface" mirrors so you don't get a double reflection from the glass. Thanks for another great video!
@lachlanC50
8 жыл бұрын
i also love that if they adopt this, a key day to day useful measurements bare roots can be taught and discussed by a classroom science experiment
@Cactusworkshopchannel
8 жыл бұрын
Fantastic as always!
@martinrosen9742
7 жыл бұрын
found you via a colleague, very well done videos. I will tell teachers to show your videos in classrooms!
@blockchaaain
8 жыл бұрын
Next video: How high-precision gravity measuring devices work ?
@dazzershell
5 жыл бұрын
Anchor and ballistic gravimeter. First is too simple, second is too complex. It would require interferometer with stabilised wavelength HeNe laser, and most hard part to made - probe unit thrower. Probe must flying in vacuum tube without any rotation or tilt, also it must have prismatic reflector for interferometer work. Computing is the easyest part). Our gravimeter was mounted on Ural military truck.
@AngryMrFixit
5 жыл бұрын
I have been watching for some time and finally subscribed, in part because I love that you glue googly eyes on your stuff
@exetercollegeuktechnologyc1323
5 жыл бұрын
This is really brilliant - I intend to show it to all my pre-university and university level students here at the Technology Centre - very many thanks
@Doping1234
8 жыл бұрын
Thank you, very illustrative demonstration! I've heard of the Watt balance quite a few times but it was never explained. I would have liked to hear some discussion as to what the accuracy limiting factors might be/why the professional watt balance looks differently to yours - I think this would have rounded off the experiment. Anyways, can't wait for your next project :)
@asudog8973
4 жыл бұрын
The equation have a flaw.. gravity in difrent part of the eart have a different amount. For example, gravitation acceleration (g) in or near equator is weaker than in other places.. Because your equation have a gravitation acceleration variable, than you have to find the local gravitation acceleration in your area.. And if i not wrong, gravitation is length divided by time divided by time or lenght per square of time.. since there is no mass involved, you can find the local gravitation acceleration in your area
@ChristopherBrandsdal
8 жыл бұрын
Insane! I just love your work! Yet another great video.
@gaius_enceladus
5 жыл бұрын
*Excellent* video and a *great* model! This is the kind of model that really gives a good feel for the new definition!
@Tommykee999
8 жыл бұрын
please more vidoes as a young 16 year old i love to see scinece and its applications
@fohdeesha
8 жыл бұрын
I'm sure you already have but just in case you haven't, check out the channels smartereveryday and Tom Scott. for more electronics focused videos, check out eevblog. for mechanical/tools type stuff and the biggest goofball on the planet, check out AvE
@altaroffire56
8 жыл бұрын
If you like science and its applications, there's a channel actually called Applied Science :)
@fohdeesha
8 жыл бұрын
doh! Can't believe I left ben's channel out - he's one of the best. Definitely check out Applied Science as Altaroffire says
@Tommykee999
8 жыл бұрын
altaroffire56 oh yes I love that channel I am currently subbed
@taijuonfire
8 жыл бұрын
These are getting really good! Well done sir.
@jasonsilver5339
7 жыл бұрын
@Practical Engineering, I found this very interesting and was the first time I have heard of this method for defining the kilogram. Last I had heard was that we are trying to define the kilogram based on a particular number of silicon atoms. "Veritasium - Worlds Roundest Object" is a good video on this.
@ger128
5 жыл бұрын
Really great video. I had to watch it several times, but by the end I felt like I actually learned something new!
@TheMarcball
8 жыл бұрын
Fantastic, I greatly enjoyed it and will be pondering the significance on and off over the coming days. Well done ! Keep on trucking ! (from France)
@brainfornothing
5 жыл бұрын
I read this in the day, but I never understand it very well, until now. Thanks for sharing !
@Conservator.
Жыл бұрын
First time the now definitive intro tune is played. 🤓 (That tune has become an integral part of Grady’s videos and it always plays in head just before it starts in a video 😁)
@ThePiquedPigeon
2 жыл бұрын
I've missed the first seconds of the video showing Grady sketching that drawing at 0:38, and when I saw it I though it was one of those ornate patent drawings from the late 1800s. Grady is really a classy drafter!!
@HeavyboxesDIYMaster
8 жыл бұрын
I guess it depends on how you define an "artifact" and "fundamental physical constant". I would imagine that the speed of light and caesium atom, under a specific set of conditions, would be considered constants. I would also imagine that a kilogram weight made up of copper that has 9.47771x10^24 atoms would be a physical constant. Of course, these atoms would have to be identical in nature. The problem is counting all the atoms. But it was also a problem, way back when, to count the periods of radiation in a caesium atom because of a lack of technology. It seems to me that a physical constant is actual relative to one's ability and what is practical based on today's technology.
@PracticalEngineeringChannel
8 жыл бұрын
+Heavyboxes some very good discussion here. I didn't have time to go into it, but the other feasible proposal for redefining the kilogram is a sphere of pure silicon, where the definition would be the number of atoms just like you said.
@romeokilo125
4 жыл бұрын
thank you for this one. I read an article about this but definitely didn't understand it as well as I do now.
@holysimon23
5 жыл бұрын
2 little problems: at 8:34... Gravity constant should be in meters per second squared... Also, gravity in not constant at every point on Earth... It varies ever slightly geographically. So...
@SuperGamingeek
8 жыл бұрын
Amazing video as usual, nice work Grady.
@scott98390
8 жыл бұрын
Great video, great demonstration - great all around!
@rayg5445
7 жыл бұрын
I just saw this in a Science magazine stating "Le Grand K could be facing retirement." It's awesome to see this video since I left the waiting room a few paragraphs in.
@johnSmith-ke5il
8 жыл бұрын
very well produced Video and very interesting and important topic
@kianakim1
8 жыл бұрын
Great video as always! You always have such high quality demos with an easy to understand explanations. Also, googly eyes!
@Philcotigo
4 жыл бұрын
8:25 If you also wondered why g = 9.793 m²/s and not 9.81m/s²: Its the gravitational acceleration substracted by earths centrifugal accelaration at the surface. According to Wikipedia the value 9.79379 is right, but it looks like there is a typo in the unit: [m²/s] -> [m/s²]
@deadmeatdec2164
4 жыл бұрын
I have seen like a dozen of your videos sir and what you call the juxtaposition of natural materials in your precision instrument I call you have cool boy toys and like playing with them.
@whatthefunction9140
8 жыл бұрын
damn! you scienced the shit out of that!
@rlewis1946
8 жыл бұрын
And he showed it using some basic Algebra, too! R
@theomnipresent1
8 жыл бұрын
Yeah, Science Bitch!!!
@kenmore01
3 жыл бұрын
Okay, that's pretty cool. It's also pretty cool that you didn't burn the place down. 😃
@qwedcxyaqwedcxya
8 жыл бұрын
Voltage is derived unit and is defined by using mass, so you are defining kilogram by using kilogram.
@MichaelNatrin
8 жыл бұрын
This is really really cool. Thanks for sharing.
@zhubajie6940
6 жыл бұрын
Watt Balances are only transferring the calibration to volts and amp metrology. A much simpler way is the Silicon mass standard. Silicon 28 isotope ball standard where a pure crystal of the isotope polished as the standard. There you have the only distance (diameter) to calibrate the standard. The fewer steps the better.
@joshajohnson
8 жыл бұрын
Another great video Grady, can't wait for the next one!
@fennercolson8680
8 жыл бұрын
great work as always man. keep up the good work, it's much appreciated
@JorgeJimenez2020
6 жыл бұрын
Awesome video and you have done a great job explaining all the theory! Subscribed!
@ExCoSeH
8 жыл бұрын
Very informative video. Really enjoyed watching it.
@alexanderschwagerl9201
8 жыл бұрын
Looks like your are using the NIST-Labview Software :) You might be glad to hear that the new python based software is almost done and even better. I'm on it!
@PracticalEngineeringChannel
8 жыл бұрын
Sweet! Are you at NIST? Huge thanks to you and your colleagues for making the science more accessible to dummies like me!
@alexanderschwagerl9201
8 жыл бұрын
Yes! I am there for an internship and got to work with the awesome team which created this project and the even more awesome actual NIST4 Wattbalance.
@danacoleman4007
4 жыл бұрын
You know, you could have just been a carpenter and not made all these videos reminding me how dumb I am! Really great channel sir!
@Borskey
8 жыл бұрын
I hope you aren't salty about the "Fail of the Week" thing -- your video was excellent, and very educational -- even though you didn't get the results you were hoping for. In fact, the fact that you showed that, honestly, and didn't sugar coat your results is precisely WHY your video was so good and educational. That makes it worth MORE than a 'everything worked fine' type of video -- and it seems that is part of what the 'Fail of the Week' is for. (And, speaking of such things, I would love to see data on how accurate your home made Watt balance is)
@PracticalEngineeringChannel
8 жыл бұрын
Haha definitely not. I was happy to be featured, and that's really the spirit of the "fail of the week": that we learn through our shortcomings and mistakes.
@enordentoft
8 жыл бұрын
For non-engineering, non-science, and just generally everyday use, in countries using the metric system we usually just correlate a kilo to ~ 1 liter of water.
@danielhawkins3392
8 жыл бұрын
they have done something very similar with a sphere made of silicon(I believe). silicon was used as the structure is most well researched and understood. its the roundest object on earth!
@Ikkarson
8 жыл бұрын
you mean at 4 degrees Celsius? or even at 277,15 K? that would seem more accurate for a metrologist ;-)
@marianoaldogaston
8 жыл бұрын
yes that it is true. the problem with this as definition is that 1 liter of water have a mass of 1 kg. at 4 c. but at one atmosphere of pressure. and for the pressure definition you need the kilogram.
@ESSBrew
7 жыл бұрын
yeah, but a liter of water is based off a kilogram. So you are doing the conversion backwards.
@maaskeimorgen
7 жыл бұрын
but the volume of a fluid doesn't vary with pressure now does it?
@IncroyablesExperiences
7 жыл бұрын
Is the software Mathlab ? Great video, true science !
@PracticalEngineeringChannel
7 жыл бұрын
+Incroyables Expériences Thanks. It is Labview
@taschke1221
8 жыл бұрын
When they do redefine the kg, they will have to keep in close touch with LIGO to make sure there is not an astronomical occurrence (two black holes coalescing) that will change the distance of the laser(s).
@RoyvanLierop
8 жыл бұрын
That looks like a USB-6001 from National Instruments, Labview is preferred but it is possible to program the device in C. It's a very versatile device that's easy to use and has great features like an internal DAC.
@TeganBurns
7 жыл бұрын
I feel like there's still a number of unchecked variables here
@lulzmachineify
8 жыл бұрын
Your cat was chewing your toothbrush in the end. Just so you know 😛
@PracticalEngineeringChannel
8 жыл бұрын
That one was retired long ago
@taschke1221
8 жыл бұрын
lulzmachineify that's the cats toothbrush. He was just doing what most humans struggle with because he lives with a genius.
@JanWey91
8 жыл бұрын
The animation was amazing!
@SuperMakeSomething
8 жыл бұрын
Hi Grady! Awesome video! I'm curious as to what your results were -- how accurately did your watt balance work? Specifically, I imagine that estimating the translational (linear in vertical) velocity off of a sensor mounted on the boom would introduce some error depending on how you a.) calculated the velocity (r*d/dt(theta) vs. it's equivalent involving sine), and b.) discretization noise from differentiating your position sensor. What was your sample rate and sensor resolution? Regarding a.), how much would mounting the laser (or adding a third laser) on the table underneath the "weighing pan" increase the accuracy of your measurement? Thanks and keep on rocking!
@PracticalEngineeringChannel
8 жыл бұрын
The final results of the 20g measurement are shown at 8:31. Most of the testing I did got me within 10%, but the main limitation of the device is how accurately I can measure current. Honestly the main source of error is probably the force from the wires connecting various components to the beam. Keep in mind that this was designed more as a demonstration about how the laboratory-scale watt balances work. The shadow sensor is calibrated beforehand so you have a direct relationship with the vertical position of the platform, so all that non-linearity doesn't really matter. You can see at one part in the video the process of measuring BL. There's not much noise at all, just a bit of hysteresis.
@SuperMakeSomething
8 жыл бұрын
Thanks for the thorough reply and for pointing me to the results at 8:31. Sorry that I missed those during my first viewing. Again, I'm very impressed with the thoroughness and really enjoyed the demonstration. I look forward to your future videos!
@artjones2498
2 жыл бұрын
hey i know this is a old vid....but i really like it and your wood working skills are sharp your watt balance tool looks cool.....makes me wish i paid more attention in electronics in school
@Pillowcase
8 жыл бұрын
Fantastic! thanks for making this
@Upsidedownorangejuice
8 жыл бұрын
This video was really really good
@MethodicalMaker
8 жыл бұрын
Love the videos, The time you put into your animations and drawings are mind blowing. Could you perhaps do a follow up video covering some of the other proposed kilogram replacements? such as the international avogadeo project?
@CyborgPandaBaby
8 жыл бұрын
This was actually really cool
@dyzoly
3 жыл бұрын
This is truly huge!
@rorabr
8 жыл бұрын
Awesome! Thank you!
@LowtechLLC
8 жыл бұрын
Wow, great video!
@0312matheus
8 жыл бұрын
I'm taking a course in Instrumentation this semester and my final project will be a balance using an apparatus like this, but instead of building a complete watt balance I will consider my system as a spring-mass system and measure the mass looking at the fundamental frequency of oscilation of my system. It'll be cool to try a different physical principle, but sadly I'll lose the "self calibration" feature. If only you posted this video a few weeks ago I could have improved my project idea.
@PracticalEngineeringChannel
8 жыл бұрын
That sounds really cool. If you document the project on the interwebs, send me a link. I love stuff like that. I'd love to see your project.
@Tom_____5
8 жыл бұрын
What a great video man. So interesting
@sebsunda
5 жыл бұрын
Amazing video!! Thanks a lot!
@ComandanteJ
8 жыл бұрын
Top quality, as always.
@mattchuckle2030
3 жыл бұрын
I’m literally learning about mass in science!
@TheDawidh15
7 жыл бұрын
Awesome! Thanks for this video
@ryanburbridge
7 жыл бұрын
Thank you for this!!! You earned my sub... first video I could find explaining the soon to be new kilogram standard. I would love to finally weigh BIG K and see how far off we have been lol
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