The Engineering of Droplets and their Formation in a Commercial Inkjet Printer

Bill describes how the minimization of surface area and inertia compete to form droplets. He then shows how engineers use this knowledge to create precisely-sized droplets in a commercial inkjet printer -- the type used to print expiration dates on food packages.

[@Lightacre.]

When the world needed him most, he vanished

[@cedrichua3476]

I hope it won’t be 100 years until he returns...

[@dnsgfs]

This is so sad

[@nousername8162]

He’s writing a book and children

[@cedrichua3476]

@@nousername8162 yuppers... hope he comes back soon

[@phil_cassidy]

@@nousername8162 He can write children? Now that's some advanced engineering.

[@shashankvemuri1219]

Always a clear cut explanation. You are the real engineering guy

[@curtleyambrose100]

straight to the point. no bullshit. only relevant pre information.

[@nousername8162]

For those wondering: he’s writing a book and that’s why no content

[@engineerguyvideo]

... and two small children ... one of whom did not let me sleep more than 4 hours until Jan 2 2020 ... plus a pandemic.

[@MichaelBennett1]

engineerguy Take care and enjoy the break from KZbin, your videos are welcome any time you decide to return.

[@dcmurphy5157]

Oh, he is human. My bad, I thought he was a robot given his immense knowledge and understanding of world.

[@samuelmaucaille702]

​@@engineerguyvideo you make such amazing content. Greetings from Peru

[@engineerguyvideo]

Thank you!

[@EeveeEuphoria]

Just an FYI, Bill updated his website just today actually! In a nutshell, he's been writing a book which will be the basis for a new series of videos, but unfortunately family life and of course the current pandemic has prevented him from actually getting to work on these videos.

[@jessesanchez9998]

I miss him 😢😢

[@NuclearMex]

Nice.

[@KingLich451]

good to hear he is doing ok

[@RainOrigami]

thanks dude

[@litigioussociety4249]

I'm always amazed how something that looks so simple is not only much more complex, but can require many decades if not centuries of research to achieve.

[@ScienceDiscoverer]

In fact if you look around yourself in a house youll notice that absolutely EVERYTHING that surrounds you is unbelievably complex and each little or big thing requires its own science and almost all life worth to create it... This is mind bogging...

[@RealEngineering]

The don is back.

[@PradhanAarya]

he is backkkkkkkk!!!!!

[@swagzilla3000]

You guys should collab. The 2 best voices in the engineering videos game

[@abcqer555]

You two rock

[@JohnDobak]

Get back to work you. Also you're right.

[@apollogeist8513]

The don is gone :(

[@nk361]

Take your time, we're all just glad you're okay and still spreading good info in any way. Hope your kids end up loving engineering as much as you and us

[@DobbieDize]

How do u know

[@karazanic]

Hello Bill - It's been 3 years since your last video, and i know you're writing a book right now, but i just wanted to say - thank you for all the videos you've made, they infected me with the love of technology, love of learning new things, and love of engineering - thanks to which, i was able to fix a lot of things in my home myself with the knowledge you and others like you shared with me, and was able to create things myself too - from simple toys for my pet rats, to building a radio all by myself. I don't live in a good country, but i will definitely try to save up for your book when it comes out. And i will keep trying to go to some kind of school to become an engineer, or even just a "simple" plumber, anyone who is able to create something as part of their job, and is challenged by new situations and problems. Your content inspired me, and i'm sure it inspired hundreds more. From the bottom of my heart, thank you for everything you do.

[@Trump4prisonxxx]

RIP i heard you died!

[@Guru_1092]

Answers to questions I didn't know I wanted answered. Amazing as always!

[@tomo8433]

Thank god you are back. Always amazed at how you are able to breakdown and explain complex ideas to the point its easy to understand

[@HoldandModify]

People didn't know how to read and we got the Catholic church. KNOWLEDGE IS POWER. Explain to us Engineer Guy! Glad you're back!

[@kuhmpashun]

The Feynman technique in real time.

[@thehobknocher]

Another quality video.

[@JaredOwen]

Great video as usual - thanks Bill

[@HopeScreen]

Ur animations is what I wish to make like them.

[@haribganesh8519]

Your explaining things in simple way

[@literallyamonkey881]

He looks just like mark hamill

[@Trump4prisonxxx]

RIP i heard you died!

[@terrymcnaughton1430]

Nope,he isn't dead.​@@Trump4prisonxxx

[@I_am_a_cat_]

2 years without my favorite educator... what's the point in even going on without engineerguy :(

[@engineerguyvideo]

I will be back! Page proofs for new book arrived last week .. although pub date is March 23, 2023; getting studio back on order after nearly two years of HVAC renovation.

[@I_am_a_cat_]

@@engineerguyvideo you have no idea how excited that makes me. Your videos helped me beat opiate addiction, to be completely honest. Whenever I was struggling with cravings I'd put one of your videos on, it worked wonders. Over 3 years clean now... so this channel holds a special place in my heart.

[@Valiumtino71]

@@engineerguyvideo YES!!!

[@fckgooogle1000x]

@@engineerguyvideo Return of the king?

[@frankcastle1862]

@@engineerguyvideo ayyy :DD

[@alexnedved6830]

This channel is the one I will always stay subscribed to no matter how long between uploads. I love it this much.

[@makatron]

Always worth the wait

[@ArmyPig007]

Good to see you back Bill! Great video!

[@lovemovement8808]

this gentleman may be the best communicator on all of youtube

[@Jacksirrom]

Engineer guy please come back! We need you now more than ever! Our man is sitting on a young person's dream job but he's still writing books!

[@Desugan69]

he is working on new video/s

[@UselessDuckCompany]

I almost jumped out of my chair when I saw a new video was posted.

[@arwahsapi]

Hi Mike, the CEO of the Useless Duck Company.

[@lordvenom4419]

@@arwahsapi tomorrow I have auditing exam I am watching this. why

[@JayRexus1337]

I remember doing that... 2 years ago

[@criii4950]

@@JayRexus1337 here we are.. in the after

[@JayRexus1337]

@@criii4950 unfortunately, how painful it is to be here, in the after, when the excitement of newness has worn off, and we are left with a sense of wonder at what we have witnessed

[@seanheelan6740]

Wish he would comeback!!

[@engineerguyvideo]

I will

[@seanheelan6740]

Yes!… (insert fist pump)

[@SeraphOfTheNine]

@@engineerguyvideo great to hear! Hope you and yours are well

[@موسى_7]

Best engineering channel that puts Real Engineering to shame.

[@a68riz]

Miss the Engineering Guy. Appreciate all you shared and taught us.

[@cinobro6393]

Woah, didn't expect to see a new video from Engineerguy

[@2DLove]

Everyone loves the way you break these concepts down for your videos. You're truly a fantastic teacher.

[@timfondiggle2582]

How are you sure *EVERYONE* loves it? I'm sure *MOST* people do, but not everyone. I'm sure there's even some dickhead out there who absolutely hates it. You shouldn't lie on the Internet man, Jesus can see everything you say, and he'll send you straight to Hell for lieing. Be sure to confess to your local priest, you never know when you'll kick it for good, and I'm sure you'd rather be in heaven than the firey depths of Hell.

[@patrickw.4422]

Tim fondiggle no need these bs plz.

[@connor7063]

@@timfondiggle2582 bruh

[@billpotter9716]

Hi Bill. Just checking in. I echo the thoughts of your other viewers in saying we miss your warm words of scientific wisdom. Hope your family including your new kid are doing well. I am totally ready for another video please. Much love from Oregon.

[@ezragonzalez8936]

Bills voice alone merits a subscribe! fantastic illustration of something deceivingly simple yet so complex!

[@jkkarkar]

Always a pleasure to watch your video's, Bill. Thank you!

[@huemungus69]

You are a great teacher, hope to see more soon!!

[@danielzboy]

Videos like this make me realise that we take many things in life for granted. Many everyday objects are actually the results of years and years of scientific development and research.

[@rubendavila6248]

I'm sorry I am late to the show, but please make a return. There are thousands more just now discovering you!

[@5678sothourn]

Seems he’s writing a book ans has 2 kids now

[@yusokrazee]

He lives! Always a treat to see you in my feed. Welcome back, bro.

[@enjoyyoursleep1]

Whats in store for 2023? Love your work on this channel 'engineerguy'

[@engineerguyvideo]

A series of four ~15 minute videos on the engineering method. The are a companion to my book The Things We Make that comes out on March 21, 2023 ISBN 978-1728215754.

[@rdaltry777]

Came here to say how much we all miss you. Hey, if you're doing the family thing, that's great. Just know you are a treasure. Your explanations and fascination with seemingly mundane things brought great joy to many. Best wishes to you and yours, Bill.

[@engineerguyvideo]

Thank you.

[@ahmadshawarr]

woah a youtube video that has a true title/thumbnail without a screaming intro?? you belong somewhere greater my man

[@epsilonsigmamu]

Hey! I work for a CIJ company! Cool to see someone talking about the stuff I see all the time!

[@Pikaroth]

We need you back now more than ever! If the channel is "dead," so to speak, I, and many others, hope you do a final "goodbye" video, at least! Miss you!

[@Sara__finance]

☝️☝️Nothing to talk much but if you are ready to work from the comfort of your home even from your working place with high weekly payment you send me a message saying I'm interested Please: I know not everyone will be interested ignore if aren't interested God bless you all

[@AndrewBoundy]

My dad was an engineer - he would have loved your videos. I'll enjoy them for him - thanks.

[@davidczuba7723]

Well done. Thank you, Bill. In 1995, I traveled to Dayton Ohio to train on Scitex inkjet technology, formerly Kodak Versamark.

[@shjxhdjdjxh]

Welcome l hope help me orphansneedWe putdifficulthe havechildrenWe needyesterdayno There isfor us housing livingtentmy seekersThe helphelpsickneed medicineuntilinsurancehealthyCut offAbout MeI hope helpI have Proof my wordspay when God,

[@TheOzarkWizard]

Just found this channel, I hope you continue to upload.

[@engineerguyvideo]

Yes .. see update at engineerguy.com

[@TheOzarkWizard]

@@engineerguyvideo great to hear from you, keep up the great work

[@chriswatson2407]

Well done on the news of delivering your first draft. Onwards and upwards!

[@engineerguyvideo]

I was working on scripts from the manuscript today …

[@shenghan9385]

Very well. There are always those who actually study all the phenomena in details before and after the need for such a knowledge is there. And thank God for creating those people who greatly convenient and enrich our lives.

[@TheBabbage78]

I use one of these commercial inkjet printers at work almost every day and I had no idea how it worked. Thanks for the video

[@PRCORPSMAN13]

Come back Bill! Need some of that knowledge

[@l-dv2502]

This youtube channel is definitely one of the best accounts made on any platform on the internet

[@GregPerham]

I never would have thought the machines to print those dates on cans were so sophisticated!

[@sudokode]

Bill, I hope you've been well. You made some amazing videos, and I hope you'll come back soon with more. Got to thinking about your videos recently, but I'm afraid to start watching them because I know I'll end up watching them all again... And I've just been a bit busy... I hope that's all you've been up to! Best, everyone reading the comments right now.

[@MysterX79]

I also worried that there might something have happened to you - not surprised so many people missed you - I'm very glad you are back.

[@vonhendrik]

Nah if I remember correctly he just had a kid. Little engineering guy jr.

[@MysterX79]

@@vonhendrik Best reason to take some time.

[@abex701]

Still here, subscribed, patiently waiting. Hello from Chile

[@engineerguyvideo]

Hello!

[@abex701]

Omg, best day ever. Gonna re-watch the aluminum can video to celebrate

[@russtuff]

I'm glad I checked in on this channel, his site says: New Book & Companion Video Series Coming March 2023

[@engineerguyvideo]

Indeed … I was told there is an Amazon page for it now!

[@russtuff]

@@engineerguyvideo pre-ordered!

[@kassikullles]

Ah its been 3 long years! Used to love learning new stuff from you before falling a sleep, such calming voice.

[@JasonArmond]

I'm not an engineer and never really thought about droplets before, but wow, I genuinely found this video fascinating. Thank you!

[@AndersEngerJensen]

Sweet! Been a long time since last video? Saving this for after work. :)

[@JJRicks]

Anders, fun to see you here! :)

[@L00PdeL00P]

Aw hey dude

[@Deluxeta]

How's it going, retro guy?

[@Sillimant_]

I know next to nothing about design and engineering, but these videos are WAY too well made and interesting to pass up on

[@PacoOtis]

Dude! The droplets appear to be "spherical" and not "round" and the same thing is true about our planet and so many call it round. Thanks for the video and the very best of luck!

[@addivf2911]

Oh my goodness, a new video from the engineer guy? Is it true? This is truly a blessed day

[@jessesanchez9998]

Miss this channel 😢😢😢

[@engineerguyvideo]

I will be back

[@jessesanchez9998]

@@engineerguyvideo 😁😁😁😁😁🙏🙏🙏🙏🙏🙏🙏

[@F1fan4eva]

Bill! If you haven’t already participated in academia and taught students, that’s a missed opportunity for students. I consider myself lucky you have decided to make such informational and straight to the point video. Thank you thank you thank you!!!!🙏🙏🙏

[@saboo_tage]

This may just be the best science channel on the entire site.

[@hobojakobo]

One thing that makes these videos so captivating and informative, aside from the extremely interesting subject matter, is Bill’s ability to explain complex ideas in a simple way. Such an underrated skill and something that always excites younger generations. Love these videos.

[@OlOleander]

I've always wondered about this. Another thorough - and thoroughly entertaining - explanation. Thanks Bill, and welcome back!

[@1ls376]

Comparing Bill with teachers I had in Nigh School, is like night and day. I feel like I could learn anything from these videos.

[@justpassnthru]

This guy is the Bob Ross of the engineering world. Very soothing to listen to and I feel smarter after listening!

[@shjxhdjdjxh]

Welcome l hope help me orphansneedWe putdifficulthe havechildrenWe needyesterdayno There isfor us housing livingtentmy seekersThe helphelpsickneed medicineuntilinsurancehealthyCut offAbout MeI hope helpI have Proof my wordspay when God

[@fiveolddogs]

The Engineering Guy never ceases to astound. He pronounces "almond" as ALE-mund (3:53). Simply fascinating.

[@ShanerTheGrey]

Please make more than one video every few years 😢

[@michaelinminn]

This guy knows his stuff, and knows how to convey his thoughts. Genius!

[@shjxhdjdjxh]

Welcome l hope help me orphansneedWe putdifficulthe havechildrenWe needyesterdayno There isfor us housing livingtentmy seekersThe helphelpsickneed medicineuntilinsurancehealthyCut offAbout MeI hope helpI have Proof my wordspay when God

[@almostanengineer]

It doesn't even bother me that theengineerguy only uploads infrequently, because it's always worth the wait 🙂

[@engineerguyvideo]

It bothers me!

[@TheDagger55]

@@engineerguyvideo 0_0

[@rahultnene]

Love your videos Bill! Clear, concise, and entertaining. Looking forward to the next one!

[@darrencorbett9883]

man i miss this guy

[@engineerguyvideo]

I miss you too … but I will be back

[@darrencorbett9883]

@@engineerguyvideo good to hear mate 👍🏻👍🏻🤣🤣

[@TweeterMan287]

@@engineerguyvideo Oh hey! I literally just came over to your latest video to see where you went. Glad to see you!

[@blaizeatri]

Glad you’re ok! I also recommend putting a community post 2 months before you’re ready, to let more People know!

[@engineerguyvideo]

Good idea

[@AnanyaGupta]

You are more than an engineer! Your ability to engage and explain without the flashing and whistles is so wonderful.

[@cequiestbon3676]

You’re so educational but at the same time have such good content for old videos

[@TrabberShir]

Wow, this is a channel I don't think I have seen in my sub box for a long while. Am very happy to see this.

[@foadrightnow5725]

I wish the video was longer! ALWAYS fascinating and informative videos! 2-thumbs up!

[@Aguacommander]

Great to have you back! I'm currently developing a ink for printing through a consumer ink-jet printer. It was awesome to see you cover something that has been on my mind lately.

[@millea8]

Let’s make this guy a legend…these videos are like intimate “How It’s Made” and I’m addicted…so rad!

[@GRAHFMETAL]

I love this channel. He has a PERFECT way of explaining things. Great stuff!

[@s.j7423]

your channels a real wonderful source of content in quarantine! we hope you've been keeping well !!

[@prod805212]

'Diffusion' feels like the most important physical concept. You often do a fantastic job of explaining how diffusion at large affects different chemical/physical/biological concepts.

[@randomname4726]

You explain things so perfectly and effortlessly.

[@1OkiePackRat]

Wooo Hooo!!! Great to see you back Bill! Your videos are always interesting and informative, and fun to watch.

[@Doc-Holliday1851]

I always love seeing your videos in my subscription tab. 👍

[@E-63836]

This guy can make ordinary subjects into extraordinary videos!

[@Phreakrider]

What a fantastic exposé of the matter. Never taught that much engineering went into those ink jet printer!

[@NuclearMex]

Perhaps one day, engineerguy will return.

[@engineerguyvideo]

Yes .. yes I will … binder labeled “video development” right now

[@NuclearMex]

@@engineerguyvideo I must say that I am quite happy to hear a reply. I look forward to reading your book whenever it is published. Take your time and take care. Like awaiting the return of the avatar, we will wait.

[@SweetsourGamer]

@@engineerguyvideo this reply made my day! I hope to see your return soon! :D

[@amonynous9041]

@@engineerguyvideo we miss you

[@adamkendall997]

Man I was just going to say, Ink Jet Printers. The Videojet printers I work with use a crystal that vibrates at 60,000hz, thus making 60,000 drops per second. There's an LED light flashing at the same rate allowing one to actually see the drop formation using a loupe. After that, the charge tunnel and deflection plate work similarly to a CRT.

[@saleplains]

i went down a rabbit hole on droplet formation a couple months ago when i set out to build a fount that emulated sound of rain more realistically by creating falling droplets instead of streams i never before considered what an immensely complex process the formation of droplets is. for my application consistent sizing was not necessary and i instead relied on a fixed hole diameter and head height on the rainhead to achieve the desired results. thank you for this wonderful video

[@drao2000]

You are a gift to humanity. Please continue to share your talent and knowledge.

[@joho0]

It's been 3 years since the last video, so I think it's safe to assume the channel has been abandoned. That's fine, priorities change, I get it. Bill has created some amazing content that will continue to educate and entertain for as long as this channel remains, but a goodbye or au revoir would be nice so people aren't left wondering what happened. I wasn't sure, so I googled his obituary. Glad to see he's still alive.

[@pakcikpingu3751]

dude literally on 9 days ago comment Prof Bill Hammack (the guy in video) explain why he is away. And he also working on new video

[@joho0]

@@pakcikpingu3751 good for him. I only watch his videos. I hope he makes a lot of money off his book, but it means nothing to me. I won't be buying or reading it. It's too bad he quit making videos.

[@pakcikpingu3751]

@@joho0 He is making a new video (as we speak he is filming it). He not quitting youtube (and previously he also stream on KZbin and Twitch as a test)

[@Acemans]

Awesome to see your videos again, hope youre having a great time

[@Snowbobadger]

Absolutely astonishing application of fluid mechanics principles. Excellent, informative video Mr Hammack

[@ktadamsII]

Glad to have you back. I was worried you stopped making these amazing videos! Thank you for your dedication to these engineering videos. I absolutely love them!

[@profbollo338]

When are you coming back with some more videos we miss you, your presentation skills are top class sir.

[@shjxhdjdjxh]

Welcome l hope help me orphansneedWe putdifficulthe havechildrenWe needyesterdayno There isfor us housing livingtentmy seekersThe helphelpsickneed medicineuntilinsurancehealthyCut offAbout MeI hope helpI have Proof my wordspay when God.

[@left4newbz]

Miss you, man. Hope you and your family are doing well

[@haskee5349]

@He Need Some Milk! very cursed

[@TRPGpilot]

Thanks for your clear concise information. Thank you for NOT adding music.

[@albertlert]

Great video, clear explanation. Just love the no fuff approach too!

[@kirklazarus1132]

Amazing to see you back (hopefully)! How are you, Bill?

[@engineerguyvideo]

I am well!

[@kirklazarus1132]

@@engineerguyvideo Glad to hear that!

[@Sogrim100]

I hope you are doing well during these times!

[@josephmcconnell7310]

Your videos are some of the best on the internet. Your use of this medium for teaching is something all others need to consider for their content.

[@Flashtone08]

I know that passion fills the cup and all these videos are a result of the overflow. Im eagerly waiting for engineer guys return but also know these video require a lot.

[@badaldebnath3771]

Great explanation Bill. Admire your work. Keep it up.

[@shoukathkhan3646]

Welcome back. I have been missing your videos for sometime

[@techlife9665]

Just all I am looking for... Clear explanation of printer ink technology... Thanks a lot....

[@josephulbrich7523]

I love your videos. They are my favorite videos I've ever watched on KZbin, I wish there were more content creators like you on the channel who make learning engineering concepts so interesting. I wish you or a group of your engineering friends would collaborate to make more videos like these, the world needs more videos like these.