Where DO screws come from?
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- Опубликовано: 7 июн 2024
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The first in a series of four videos on screws, though other videos might get mixed in.
0:00 Introduction
0:54 Waterscrews
1:48 Fruit presses
4:08 Worm Drive
5:24 Internal thread cutting
7:19 Dioptra
7:50 Armor screws
8:17 Screws vs bolts
9:01 Armor part II
9:26 Early screw drivers
9:47 Medieval House book
13:01 Löffelholz Kodex
15:22 Ediphone
17:31 Conclusion
More info:
machinethinking.co/
Contact me:
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More Medieval House book images:
commons.wikimedia.org/wiki/Ca...
Löffelholz Kodex PDF. (Also sometimes spelled Löffelholtz)
machinethinking.co/2020/11/17...
Plastic Injection molding animation from EngineerGuy:
• Plastic Injection Molding
"Mary had a little lamb" recording is Edison himself, but recorded about 30 years later, recreating what were supposedly the first recorded words by him.
The machine shown is his second prototype, though the first was fairly similar.
I'm well aware many consider Edison a jerk (to be polite) and he indeed did some pretty unsavory things. However, his immense contributions to many industries, including recorded media (audio and visual) are worthy of note. Don't worry, I'll cover some of his shortcomings in future videos. 
Наука
I am 83 years old. As a boy, I saw a legal secretary use the Ediphone shown in your video to transcribe dictation. She worked for her father-in-law who had become my father's mentor. Her son studied law and ultimately became my father's attorney. The son and I are still friends though geographically separated. Your video became a time machine transporting me nearly 80 years to the sights, sounds and smells of that office. I cannot thank you enough.
another reason kids need to do stuff with their parents.
This is really wholesome, I'm glad this video meant so much to you
wonderful story ! The amazing fact also is how much the world has changed within a few short years. My father once said to me that as a boy he used to watch sailing cargo ships coming into harbour in Douglas, IOM. Then within his lifetime he saw men walking on the moon.
One of my favorite comments of all time!
I’m back! Got canceled for “wrong think” thanks again for all the hard work. I’m starting all your videos over so I can thumbs up them all under my new handle. Clickspring is second best and that’s saying a lot!
that internal thread cutting is classical brilliance
Sometimes the most difficult problems have a simple solution. There was a mathematician who came up with the concept of solving complex problems through simple tricks. Like those Asian multiplication tricks with the crossing lines.
My boy Heron invented a manual CNC router
@@excitedbox5705 People wit long expensive educations tend to think, that all problems need complicated solutions. Very often it's about H Ford's "If I should have listened to the customers, I should have worked on inventing a faster horse" - let the problem define the solution.
@@EctoMorpheus And, by the looks of it, mass production of standardised parts! Took a few centuries to properly catch on, but it was a game changer.
@@worldcomicsreview354 Yep. That's exactly why many people credit the lathe as the most important machine ever made
I repair sewing machines. About 40 yrs ago when I first learned how they work, I recognized how important screws are to do so many different things. Another simple machine that is indispensable is the spring.
o
Who makes the best sewing machines today? What's the oldest sewing machine youve worked on? Are modern sewing machines like the ones that monogram clothes and make patches worth the money?
i think technically a spring is a component as a machine is defined as providing a function as an output of more than 1 component.
You just reminded me of the MST3K video about springs called "A Case of Spring Fever" (check it out, its short and its on youtube and worth a watch). It's a Twilight Zone style video designed to teach kids about springs, its about a guy wishing springs didnt exist and then getting transported to a world where springs dont exist and they talk about how all kinds of machines, tools, and even furniture doesnt work without springs.
A spring isn’t a simple machine like an inclined plane or a wedge, but is very simple
The old German script you asked about appears to be describing a tool known as a _Wolfsangel_ , or literally, _wolf's fishing rod_ . Although I can't read the script, the word appears (split into the words _wolfs_ and _angel_ ) in the first line of the script. A Wolfsangel was a wolf trap. The drawings you show appear to be a more "modern" take. The older style was just two pointed hooks on two ends of a bar, with a perpendicular bar to which a chain was attached. The hooks were jammed into a chunk of meat and chained to a tree, which an unsuspecting wolf would then swallow, hooking himself like a fish. A stylized version of the old design was used, for a short time, as a symbol by German civilian resistance fighters in the latter days of World War II as Germany was being overrun by the Allies. This symbol is still in use today as the emblem of the Ukrainian Azov Battalion.
No ads on a brilliant video. You’re the hero we need.
I got an ad tho (at the start only)
He should put ads. I’d happily give him some money for his amazing work. It’s well deserved. PUT ADS ON UR VIDEO!!
Hi
Got demonetized because of the firearms
Speaking of Brilliant...
Your comment about removing skill from the equation really resonates with me. I'm a carpenter by trade and being competent in my field now mainly consists of just knowing how to rely on your tools, removing as much skill from the tradesman as possible and relying on tools for precision or efficiency whenever possible.
Yes and no. It doesn't remove the skill from the bigger picture. It still requires skill (how deep of a cut to take, how much to advance it, etc). Now, it is easier. That means they can focus their skill elsewhere. Like you said - now. It's knowing how to rely on your tools. Just like it always has been. Our tools become more advanced, so we can focus skill elsewhere and continue advancing. Skill is still required to operate tools with precision, safely, and efficiency. Major difference is the overall process is faster now. Also, there's a lot of hand skill involved in more decorative carpentry (furniture, cabinets carving, etc)
As a professional furniture maker, don't sell your talent short, sir. With the exception of steaming wood to bend, most woodworking involves removing the correct amount of wood, but not too much. No matter how crude or sophisticated the tool, your hand and your eyes guide your ability. Repetition is the teacher of skill. Hold your head high, sir.
Same here. I'm a master printer. The technology employed today removes the need to intensively train. The tools, printing press, is what is relied on.
@@druckerman247 idk sometimes I think I need training for consumer printers....
@@blackbird1234100 It does remove _some_ skill, at least. Cutting a mortise using a mallet and a chisel is a completely different skill from cutting it using a mortiser. Getting a board flat and straight and of uniform thickness and width with a hand plane is a completely different skill from running it through the jointer and thicknesser.
As a retired Marine Engineer having sailed the seven seas,’ I can appreciate and relate to this video in many ways. This video was well presented, so much so that you have earned a subscription from me. I look forward to future videos on this fantastic subject. Threads are just a circular wedge which can be adjusted for varying and many applications. Without screws, my life would have been meaningless. Thank you.
My family's business designs and constructs specialist commercial vehicles,pumps,generators,field workshops,de-salinisation plants etc. Despite the drawback of not being self priming they still use Archimedes screws in the large irrigation pumps. My great grandfather and his brothers built their first trucks which went to Libya in the 1930's using Archimedes screw pumps for sewage/groundwater. Over the years as technology evolved and different family members had their input all manner of alternatives rotary,reciprocating,vane,diaphragm,were tried, but my father went back to screws in the early 90's. they shift good amounts,are very accepting of debris and most importantly having only rotating rather than reciprocal parts are far more durable,given that many of these trucks go to places like India,Egypt,Sudan,Libya etc. and that mechanical sympathy isn't a foremost priority, the need for simplicity and high durability is paramount. Not only does the customer not want to be without their equipment,it takes some effort for a major repair to be actioned,either via re-patriation of the vehicle or a pair of techs and their gear travel. My father always says and with justification,that screw pumps are fit and forget,they just work,even half knackered they still work,endorsed by the fact that we are still using them centuries later. I've spent my entire life around threads screws and bolts the most important helix,is that of a corkscrew😁
Are sliced washers still soldered together for Archimedean screws?
I was impressed by the calculations required to calculate the diameters for given pitch angles.
I can't imagine how Archimedes figured this out without a calculator or sine tables.
@@a.k.885 you would need some big washers,some of them you can crawl through😂 .The'washer'method only works on finer pitches,ours are all offset rolled sheets cut then rolled,the big stuff that is expected to encounter mud,rocks and stones are constructed using 3/4 to 1 1/4" thick steel. Up until about 1994-5 the calculations were all done on paper,now they use CAD,but Errol, the main man in the metal shop who's been rolling steel for about 60 years can calculate them almost as quick as a computer.
AVE once said that a wedge is the most important tool in the world. He noted that the thread on a screw is simply a wedge. It's a helical wedge (inclined plane). I thought that was pretty cool.
False
@@rrtsduf bold statement to make without any further evidence
I think you mean ramp. It’s a ramp wrapped around an axle.
@@fornello123 Isn't a ramp just an inclined plane?
@@fornello123 What's the difference between a ramp and an inclined plane?
There actually has been an improvement on the Archimedes screw, within the last 20 years surprisingly. It's called an "Olds Elevator". Basically the screw itself is static and the housing spins instead. This has some advantages, like being better for moving fine substances like gunpowder, rice, wheat, grains etc. An Archimedes screw pushes a lot of air, which can lift and spray the fine materials into unwanted directions. The Olds elevator only moves the substance, and what little air there is in-between the grains of rain for example.
It's a surprisingly simple difference from the normal Archimedes screw, but nobody thought of it until 2003.
Thanks for this comment! I learned about Olds Engineering because I was watching NASB videos on sugar dust explosions, which were often due to the ways the sugar was transported throughout the building. While fully-enclosed compressed air systems can be used, the Olds Elevator can be used as nearly a direct replacement for older-style elevators without a huge investment.
Come to think of it, doesn't that mean that the only thing doing the pumping is the surface friction on the housing vs the screw?
@@orppranator5230 No, the housing has a scoop attached to it on the bottom. The hopper has to have a minimum amount of material in it or the device won't work (or very poorly). The scoops and friction from the housing both work together to move the material in a circle and the screw makes it move upwards.
Is this the concept that a concrete truck works on?
@@devynforsyth4838 No, a concrete truck uses a type of archimedes screw. The housing and screw are attached and spin together, and there is no central shaft.
Wow, Heron was absolutely genius, beyond genius in fact as I did some google searches on him. He was no less than Archimedes or even Leonardo Da Vinci or even Issac Newton for his era. The rifled barrel is essentially an internally threaded tube.
I only knew him from his formula (Hero's formula) to find the area of any triangle, given only the side lengths
Genius is kind of an exaggeration. He was very smart but not genius.
Wow, that Ediphone is amazing! Thank you for preserving it and sharing it with us! I would love to see how it works!!!
I had an Ediphone and the Shaver that went with it so the wax cylinders could be reused several times.
Hes not dead!
redpatch, no he was just screwed.
I had wondered. Glad to see him back.
I was getting worried, so glad to see him posting again.
Haha no :) I also never really stopped researching videos or working on models. The state of world messed up a few different videos I was working on for different reasons but happily in the course of doing the research for this video I found enough material for more. Production time is still lengthy but I'm trying a few things to try and speed it up.
Your work is well appreciated, thank you for the quality videos on interesting topics.
The rendering at the beginning must have taken AGES, and sir, it was well worth it 🤝
I suppose that's why it's been ages since the last video :D
The final render was about 24 hours! However, learning Blender (even just a little bit) was an adventure measured in weeks (here and there). The actual geometry is from Fusion 360 of a model I made a few years ago (it shows up in other videos) but I used it mostly because it's the only CAD model I've ever done where I bothered to model the screws (well, bolts :) )in such detail and there many in a small space. It's also wildly inaccurate to the real thing which I got to later go see, but it fit this purpose. I decided to make the investment in Blender because it will allow me to make animated models of other things I will talk about in the future.
@@machinethinking what is the device?
@@kimmy_future4265 a micrometer... but you shouldn't take my word for it, check out his other videos. Specifically, the Origins of Precision.
@@ATX_Engineer oh duh! thanks!
Hi, you mentioned at 12:18 that the illustrator made an error. I believe there is a chance that they didn't. A master machinist showed me a linear reducer using left- and right-handed thread screws with slightly different leads. The result is that one thread pushes the carriage one way (say 1" per turn), while the other thread pushes it the other (say 0.9" per turn). The net result is carriage moves the difference between the two leads (1" - 0.9" = 0.1" per turn). In effect, the two screws produce a reduced linear motion of the carriage. This can be used for micro-positioning or creating a very strong clamping action. Do you have additional information regarding this illustration? Great videos by the way!
Interesting. This is a differential screw. I invented a different version using right handed screws of different pitch for producing small linear motions when I was about 15. I thought it was a great idea, but found out that I was about 500 years too late for it to be a new invention. It worked for my purposes.
@@hm5142 we used to do something similar, involving heads shaved from match books..
Or, at the time, inventors could insert errors in their drawings to protect their intellectual property at a time patent law was inexistant. Leonardo Da Vinci did that often.
A Chinese windlass is basically a differential axle. By winding a rope off of one diameter of the axle and onto the other diameter of the same axle you gain a mechanical advantage and it is self locking, much like a worm drive.
What a wonderful and very educational video ! As a trained clockmaker of 40 years I am humbled by the genesis of this small joining devise. The codex is remarkable as is your skilled and masterful ability to educate. I thank you greatly and would hope to contribute money in appreciation of your remarkable educational skills. Thank you, your work has been enlightening.
Edgar Hume
GIVE IT UP FOR MY BOY ARCHIMEDES!!!
Why? The Greeks took lessons from the Egyptians and we celebrated the Greeks? Nope, no white privilege was used for that purpose. Lmfao that stuff is hilarious
I am LOVING all of the comments on what you think about bolts vs screws. The variety and differences between people and even countries are far more than I would have expected and really eye opening!
I read german script... the individual handwriting might make it a bit harder, but when in doubt, there hasn't been any type of german handwriting been written yet, illegible to my 75 year old mom. So feel free to send me a copy for transcription.
Why did RUclips suggest this video to me? I have no idea, but neat stuff! subbed. :)
And thanks for linking the book -- way cool "homework". :D
Screws are usually threaded from head to tip. Bolts may or may not be, sometimes threaded or with a hole for a split pin or different fixing methode.
They're all just uppity nails as far as I'm concerned.
Screw that, ya nut!
I've carved a pair of 2-1/2 inch wooden screws with saw, chisel, and file. And I built one of Heron's internal threading tools too. It is tedious work but quite accessible with simple tools and some patience.
Wonderful video that just came across my feed and after watching I immediately subscribed!
As a middle school Engineering teacher, I will be incorporating these videos into my curriculum. Thanks so much!
Glad you like them! Also I happily give my 3D printable objects to teachers for use in educational contexts!
I just finished watching the video and then went back to the youtube mainscreen, where I noticed that I did not give the video a thumbs up. I guess that was the first time in my life that I on purpose went back, just to click the thumbs uo button. Congratulations on that, Sir!
Is your profile picture a German flag? Why don't you read the German that he can't read?
@@beauwhitlock5034 I missed out on that. If he forwards the pages to my I could try although it is very hard to read on the pictures.
It'd be a crime if that Dictaphone didn't get its own episode.
People stopped using their dictaphone when they developed diallers with holes that you could use your index finger in more conveniently.
I'm sure I saw a thread to an episode on the internet.
@@twickersruss ???
@@tomhoehler3284 read it slowly to get the joke!
@@twickersruss Aha! funny!
I love this info, and you did a great job with video. Script, narration, images, pacing, etc. I hope you continue to make more!
I've literally been fantasizing about a doco on the history of screws, bolts, cogs, gears, ect. Thank you so much. This is a masterpiece.
i was thinking drills
but same
Here, where i live in spain wooden threads on presses are really common. At my dad's shop they even had to remake one infected screw for a cellar, and he made it with a master screw, just as shown.
I'll never forget, about 50 years ago getting my set of tools as a kid I drove screws and nails into every fence post around the farm until I got something to work on. My first lawn tractor. I was fascinated by the nuts and bolts and springs Sadly, after dismantling it completely, it never ran again, but all future machines did. Odd this is the memory this video reminded me of.
Great videos
Peace ✌️
Dismantling things to find out how they work is a good way to learn about the world of engineering. I did it so often as a very young child things were said to be "Evanized" and I still get teased about that 70 years later!
Chrispfeifer, you evanized your lawn tractor?
This channel is simply extraordinary to lovers of history -- technological and general. Thank you so much!
This is the most amazing detailed video on the the history of the screw! Brilliant!!! Thank you for sharing your work!!!!
can't believe i'd never seen the loeffelholz codex before - those drawings are /amazing/ (not just for the machines they illustrate - something about the illustration itself seems /profoundly/ contemporary)
glad to see another upload on this channel - definitely looking forward to the next in the series
@OGlettuceWEED indicate italics for emphasis
_you know you can just typea actual italics by putting the text between underscores right?_
About 2 years ago I started a quest to learn about screws bolts and nuts: who invented them, when were they first used and how were they made. did not get much answers. This video sure answers many of the questions I had. thank you
Fascinating, superb production values and an excellent narrative. Thank you so much!
Hi, Back when I was learning My woodworking skills I was taught how to calculate the correct size of drill for the shaft and core of the screw.
The formula is (for imperial) is screw gauge +2 or 3 divided by 64, for shank size. and screw gauge divided by 64 for core size.
Also later on I worked as an antique restorer and learned that there was no standard for screw threads or head slot, because the screws were handmade
by the workshop or local blacksmith, and also i had a variety of screwdrivers each one ground for the size of slot for the screw I was extracting.
This man just made me buy a $100 book with no regrets. Bravo my friend
What book?
Yes. What book?
Dude seriously tell us what book
In my profession, a mechanic in a factory, they're all screws as far as the store room or manuals are concerned. As in a socket head cap screw (SHCS) for Allen headed screws. Only when you add a nut to the end does it magically become a bolt. If you thread it into a part with matching threads it's still a screw. But no one gets upset when you call it by either name, we all know what we mean.
I argue against this as per instructions!
I've heard an opinion that the difference between the two is that a screw is threaded all the way up to the head and a bolt has a smooth section of the shank near the head.
@@variant1394
Ehhh, the smooth section basically helps to have a WAY better stress distribution around the most critical part, where the head meets the shank. Also woodscrews, that are most definitely screws, can have a smooth shank for a section. I would say that definition is _lacking._
@@Tuning3434 I don't thin I've ever had a normal machine screw or bolt fail at the head regardless of where the thread was cut to. Most often it's the thread that get stripped off the screw, some very rare times its the thread getting stripped out of the part. I have had wood screws fail like that if they've been used a few times.
to me the definition would be:
screw: a kind of threaded rod, it may be partially or totally threaded, the exact profile of the shank may vary, it have a head or not but always has an interface for a driving tool.
bolt: an assembly composed of a screw and a nut, the use is usually for assembling parts through unthreaded holes. for this assembly to form a bolt, the nut must be the only element retaining the screw in the hole(s).
The fact that you never once told me to "screw myself" when you were talking about thumb screws and such is kinda disappointing but also understandable. Great video. Also a great reminder to take nothing for granted. Even the simplest parts of life are great inventions
What's wrong?
You can’t screw yourself while using thumb screws unless one hand is free. Turning a screw requires thumbs.
I regret that I have no erudite observation to add to the discussion. I was trained in manufacturing engineering at my university and never saw such a marvelous review of any history behind it all. I thank you sincerely for your careful study of the evidence available and then your simple presentation of it all that didn’t take as long as the history took. I greatly appreciated every one of your videos that I have seen and subscribed after the first.
I'm damn glad I stayed subscribed to this channel! It doesn't cost me anything to wait, and these videos are well worth it!
Sadly, I can only give your comment one like! 👍
The content is SO awesome.
Right on, @Jesse H.! 200K subscribers from only 14 videos over 3 years. That tells us something about how awesome this channel is and what enormous potential it has!
@@PixelSchnitzel Wow you're right that those statistics are really impressive!
The talent of this is worth millions of subs!!!!👍🏻👍🏻👍🏻 I need to learn more too!!!!🛠🛠🛠🛠
I work in a food processing plant. Augers are one of the ways we move products through different areas of the process. We also use reel screens to separate solids from water and move the solids away so they can be taken away and the water sent back to be used again (using an impeller pump, another screw). You do great work and I sincerely enjoy your videos.
I worked at a large slaughter house that had a rendering plant where they cooked the scrapes & bones. Had a maybe 10" diameter screw in between two French presses ( squeezed tallow out if cooked scrapes ) that had to have rotation changed every time they switched machines. One of our best mechanics talked them into ordering a short section of left hand screw for inside of open top conveyor. Then they could run both machines at once.
AMAZING video. Fascinating. Clear. Relevant. 👏👏👏
This video was just awesome... Great narration, great research, great presentation! Thank you! 😊
Don't forget we enjoy the surprise videos, keep enjoying making them at your pace, having a life! (ignore the whining)
First of all, THANK YOU FOR MAKING MORE VIDEOS!!!!! I can't tell you how much I enjoy the videos you make, again thank you. Secondly, I literally watched (had it playing in the shop) this video while working on my lathe! I'm new to machining, but I've always found the humble screw fascinating!!
Wish I could upvote this twice. Thank you. That was a lot of work.
Very interesting. Thank you for the big effort of putting together all this information . Congratulations.
Absolutely fascinating, this is exactly what makes RUclips an excellent educational source. In this video I am once again reminded of my ignorance of all things and how much I take the screw - for granted. Even though I have been a 'machine head' for over 50y. Good production values, cleanly communicated info.
Wonderfully done! I'm a mechanical engineering student and this sort of thing fills my heart with excitement about the richness of human inventiveness and our relationship with physics.
My father manufactured popcorn machines in the early 20th century (Krispy Kist Korn Machine Co. Chicago) so we always had tools around and dad showing me how to use them. Family often recalls that, as a toddler, I spent much of my time removing the hinges from all the cabinets in the kitchen. Have loved tools and making things ever since, but became a Pediatrician, so very few opportunities to utilize that early skill. Great video. Thanks
Haha the old screw vs bolt argument, I was thinking "oooh boy here we go again" but you circumvented it nicely! I'm not gonna fuel the fire, I know what's correct and I won't change anyones mind.
French is easier : Vis + écrou = boulon (Screw + nut = bolt ?)
That was an extremely well done video, thank you for the time you spent making and researching, excited to check out your other content!
What a fascinating, well put together and informative video, thanks so much for taking the trouble.
Well done. Not easy keeping something so simple so interesting. Thanks for sharing 👍.
I've never been so excited for screws glad to see your back the quality of your videos is worth the wait.
"work so well that you don't even notice them"
*screams in classic car owner*
Some charm, wit and a genuine 1st impression
I am very glad I "discovered" this interesting channel. Congrats.
Man I’ve been missing this channel! Glad you’re back.
Glad to see you back! That internal thread cutting blew my mind.
Bro I'm just starting this video, but I've been curious about when and where building screws originated and I'm so excited!
Excellent work. Phenomenal video. 10/10
Your videos are amazing. Thank you for the beautiful work that you do and the effort you put into these videos. Fantastic.
Wow, those medieval illustrations are so detailed and realistic !
BTW: great channel, instant sub !
Great video; I learned something new today about something I never really thought about!
Really enjoyed the video. Loved the German Illustrations. Don't forget threaded rod.
"What would happen if every screw disappeared?"
We'd be screwed.
We would return to the tapered Plug or the tapered key Until some Bright young spark thought I know We are Human after all that's said Till this generation matures Then We're F
@@bryansmith1920 ok boomer
It would be a riveting tale.
We'd be bolted!
We have really good glue.
Your series is nothing short of fascinating and should be in every science curriculum.
Thank god I’ve been wondering this for ever and never got around to looking it up.
A most informative video. Accidentally got here but so glad I did.
This is one the best videos I’ve watched in a long time. Thank you!
I’ve been checking back here regularly for this great content!
I really enjoyed watching this, as a machinist I owe an impossibly large debt to the humble thread as do all people living in modern society at large. It affects so many aspects of our lives because virtually everything you see outside nature depends on it to be made, and while the start of the industrialization of our world took out some skill it introduced the need for new skills in controlling said machines and refining their processes that made careers such as mine possible. Thank you humble screw and the people that thought of and actualized your invention whomever you may have been.
Great video and great voice over. Thanks!
Extremely educational and just plain fascinating. A very well done vid. Thank you!
I love your work. The history of how all these things build on each other and come together is truly amazing and its great to have it all together like this :)
Inspiring history lesson. Thank you for sharing this video.
and with that bolt definition you got your self another subscriber!
I'm so happy you're back
You make the best videos, my man!
The inclined plane,,,,almost as old as fire. This vid is fantastic,,,,thank you. 👍👍👍😎
Excellent work!
Can't get enough of this, awesome vid!
Absolutely top notch video! can't wait for the next one!
just love this channel
Great video, like the story telling
Wow, the quality of this video is amazing.
"what would happen if every screw just disappeared"
Easy, I would use bolts.
yes, but all bolts are screws
Cheeky solution, sir
@@quentintin1 and all screws are bolts if you cross thead them enough
that would just be nuts!
Well if they did the inmate's would be happy.
Great episode. I love it.
Nice video. As a non destructive testing inspector, i tested many augers here in the Netherlands. Mostly used for food factories al around the world and some to be placed in dykes to keep Holland dry. The old German is pretty readable to me. An old schoolfriend of mine is now a professor on the university of Syracuse, USA. He can read it.
My Dad was a bulldozer operator, and I loved his connection with such an amazing machine also.
After having watched this video it gives me much more appreciation for my lathe and milling machine.
Really glad when I get a golden recommendation like this
I just love threads of all kinds ,I get fascinated by Gigantic nuts and bolts of Ships ,lorrys etc, but never knew The History behind them..In our engineering Classes we were Taught the Different Types and parameters of Some Standard threads...This Video Is eye opener....Thanks sir..
Thanks so much for this video. Those medieval documents were so amazing to see: I had no idea!
Ahhh Just what i needed after a long day. Great video and worth the wait!
Good job. Lots of info I was not aware of
I am a 65 year old lifelong mechanic and have long marveled at the 'screw' and all the things it does, thank you for this information.
Thanks for the great screw history lesson! I hope in a future episode you'll cover the range of tightness between finger tight all the way up to stripped threads.
I WAS LITERALLY JUST THIINKING ABOUT HOW TO MAKE SCREWS!
Thank you so much for this video!
Excellent essay, historically. Two points: 1) at 12:20 a lathe is shown making a thread with opposing twists. This is not a mistake, it is making a caliper thread shown later at 13:36. 2) The difference between a screw and a bolt is the underlying physics; a screw holds things together by friction, a bolt holds things together by the tension of the metal between the head and the nut created by the leverage power of the threads. Loved the show!
Thanks so much for this video. Excellent work!
The Ediphone is not just a product of ingenuity but also a piece of industrial art. I happened to visit the Edison Park at Orange, NJ about two months back. Too bad I should have missed something like that. Or, could even they not have such a nice example?
WOW. I always wondered how the first internal thread was made with out a threading machine. Ingenious. Very cool.