The Geneva Mechanism
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- เผยแพร่เมื่อ 9 พ.ค. 2024
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This is what TH-cam was made for. Information by enthusiastic people teaching about obscure things that you would have difficulty specifically researching or even finding unless you're interested in it already. Beautiful.
And cats. Please don't forget cats.
Tldr
TH-cam
A place where you learn most your stuff. Not school
Herman Manly don’t forget the almighty algorithm
Yeah
It was made for this stuff, not little kids
You hear me COPPA
I could not have put it better.
that blows my mind! i've always wondered where the clicking sound in old film projectors came from
IKR, one of those facts that change how you think about things, I always thought it was a shutter.
Ironically I believe the shutter in a film projector was essentially silent because it was basically a fan wheel that rotated, intermittently blocking the light through the lens, not touching any other components so not making any noise.
Stephen Baldassarre always an expert about
FYI, sorry he is wrong about the sound. the projector is silent when there is no film in the projector. Film projectors require a upper and lower loop which is a buffer area. The loops flap which is the cause of the sound you associate with a film projector. This thing he is showing in this video is called the intermittent sprocket and is found only in professional film projectors, mostly 35mm and 70mm. 16mm and 8mm use a claw system.
Actually, really professional 16MM machines use a intermittent sprocket as well...I used to be a Projectionist, and I actually ran a few 16MM machines with a intermittent sprocket.
Some manufacturers that made these were Norelco, Zeiss, and Kinoton.
The Geneva drive is used in the 7.62mm and 30mm chaingun that is fitted to many armored fighting vehicles and helicopters.
Huh I was trying to think of one but I never thought it would be for a cycling rounds
The firing mechanism has remained unchanged and still relies on the same principles. Feed (cock) load (lock) fire (unlock) extract (eject). This is the same across bolt action rifles and electrically operated chain guns.The latter uses a chain which is fitted with a cam that runs across a rectangular path and works along side a Geneva drive to control dwell time between firing rounds.
mark price the 20mm as well
The Geneva Suggestion
And prior to all the electrics, was/is used in the hand-cranked Gatling gun, with mechanical advantage from a crank substituting for a motor.
You are an excellent "natural teacher." You communicate an attitude of, "Hey! Check this out!" and it keeps me interested. You did a great job of showing me where and how this thing works. I write training for a living. You really have a talent for this!!
TH-cams algorythm got better, i didnt even know im interested in this...but well. Now i do.
While you are right, the algorithm took a year longer to find me :D
@@Allexz LOL
@Inesophet you are absolutely right, TH-cam keeps track of the videos you watch to create a profile of what you like for recommendations, but on a more creepy side, site's like Fakebook actually watch your facial expressions through your camera, with facial recognition technology. They also listen to you talk through your microphone . They then build a profile of things you like, dislike, interested in, ect, and they sell it..... This is also why you can (talk only) about something and then see it in a ad on fakebook or in a suggested Google search seconds later. ⚠️ 🙊🙈🙉 ⚠️
Mind reading algorithmic AI😂
@@Allexz took me 3 years longer lol
This is the pure side of TH-cam. I enjoy
Thanks man! I try to keep things somewhat useful :)
did you just assume his gender!!!!11oneone
lol sorry
Wha'?! Whoa! Did you just use the term "gender?" :o}
Jim Shockey im sooo offended at these gender assumptions, now I need to retreat to my safe place and from there I will book some therapy to get me through this HUGE traumer.
steve thornton Really? If you're planning to somehow bar us from making such innocuous statements, as I have observed people like you doing, than you will be causing far more pain than if you simply withstood these imagined offenses, or even better, understood them for what they truly were: an effort to control others so that you can avoid having to grow a spine.
Military use: syncing weapons fire with the propeller blades of an air craft so pilots could aim using the main body of it.
An interrupter gear.
I don't know if it's a variant of a geneva drive or not, I haven't seen one, just know a little about it's history.
That's interesting, thanks for the knowledge
That's actually just a simple cam and follower mechanism, letting the gun trigger whilst there is no propeller blade in front of it.
A wild guess is that this can be used in a revolver
It was designed in the early 1910s by a french engineer for a fighter aircraft, in a patrol operation he encountered a german aircraft, but crash landed after a fatal damage in the wings, he tried to burn the plane so the germans cannot find his sync meccanism, but failed and was taken as a war prisoner and her invention was mass produced for the new fokker airplanes. Interesting history...
All of our (now antique) Peerless Roll Leaf machines used a Geneva drive to index the next bottle into printing position. They ran 3 shifts for over 30 years with nothing more than a touch of grease from time to time. The were a quality cast iron construction and were fitted so closely that there was a very minimal orientation error that never seemed to increase over time. A truly remarkable design. Later machines used Camco Units and were very good as well but still a step down from the ultra simple Geneva drives. As a 5 year apprentice Tool Maker I was given the task of building one of the Peerless machines from a pile of scrap machine parts which required making a Geneva drive from scratch and rebuilding all the other moving parts with brass inlays and braze-ups and refit. No time limits (that I knew of) and a few weeks later I presented the finished machine to the General Manager of the printing department. He and his setup people and operators went over it with a fine tooth comb and gave me a thumbs up. The old Tooly's I was training under all gave me a round of applause when I came back to the department, a hand shake and an atta boy. One of the proudest moments of my 47 years as a Tool Maker. All manual machines and hand tools. Computers hadn't been invented yet except in big research facilities. I'm not sure that today's machinists will ever have any experience like that. For that I am truly sad.
i have not watched ANYTHING related to this video yet for some reason
it Recommended this to me
fine youtube you win
Stefan Sampang Never click on recommended video it will just recommend you more simmilar videos...
oh no....
+Clash You say that like it's a bad thing
The Whalens "who cares what is recommended to you? Move on, loser."
clearly you do since you're telling me to move on and plus the insult means you put in emotions in it therefore you do care about the recommended because you are said to me "Move on,loser" and if you really do not care you would have left this alone but no, you just had to say how much you *cough* "dont care" *cough* and also for you're information look at the likes and tell me straight in the face "who cares"
stop trying to be cool and show the world how much you dont care when in reality your clearly care
also "what is recommended to me?" well it's how i can find cool and awesome videos some channels i would have never find without it and it's very good to me but this video tho has nothing related to ANYTHING i watched yet it poop up even after i put a "not interested" on it so tell me also straight in the bloody as face! "what is recommended to you" but when am looking at this you seems to don't care about what is recommended to you, maybe it's because you "don't care" *cough* ohhh please.....
columbus8myhw it is bad thing if you don't like that type of videos...
25 mm Bushmaster Cannon. Firing cycle of operation...Sear, Feed, ram, Fire, "Dwell", misfire, extract. Common Weapon System on Light Armored Vehicles.
Huh I didn't know that, cool
Its only in the feed though The barrels are chain driven but yes hes right
Mk44, M242 and M230
Automatic candy wrapping machines also use it...........
That’s the 242 right? Worked on them before, sometimes the feed is a huge pain
Why was this in my recommended, why am I watching it and why do I like it so much? I suddenly have a huge fascination with gears and simple machines like this...
and 3D printers, now I want a 3D printer, and a lab, and........
@@Bnkrobber A 3D printer would make a really shitty geneva drive. You need a well equipped machine shop and a very skilled machinist.
@@WCM1945 or a cnc lathe...and a 3d modelling software...
Your pfp really reflects your comment
One of the few channels where I actually learn something new on a regular basis.
Thank you!
I really like those 'Look at this nifty mechanism!' videos you make. Like the one about the not-a-crank crank.
Ayyy, extra credits boiiii
Yeeeah, dude!
I used to repair machinery that assembled trigger sprayers, ( think windex or 409 cleaner). Some of them used a Geneva wheel to place the cap in position. A very robust and elegant mechanism. They very rarely needed repair. The pin was a roller so not much problem with wear. 1 cycle per second 24 hours a day.
I was just wondering the same thing about mounting the pin on a bearing. It seems like that would eliminate the wear problem entirely for most applications.
Toolman329 Agreed. My use of the word "entirely" was an exaggeration. But, it would be interesting to see data on cost vs MTBF for such a solution.
William Weibel I'm thinking: how about the device being created with a few polymers. Polymer example being 3D printing filaments. Specific properties for each part required, could be achieved using the correct 3d filament for each part.
Nylon 3d filament for example; is a 3d filament polymer.
The use of this kind of material(s) for the parts that make up the assembly of the "Geneva joint" (whichever one you use as the video lists a few examples of them from watch parts) would probably aid tremendously to the length of time the assembly would operate without maintenance.
Also, As you suggested; I too would be very interested in the testing of of various complex joint assemblies with solutions only possible with today's technology. :-)
Or coat the pin in a slick polymer, like one from the teflon family, and chrome the lining of the stays.
1 cycle per second is extremely slow. The video mentioned "hundreds of rpm". If the geneva wheel is only durable at 1 cycle per second or similarly small speeds, then it can be considered a very undurable mechanism.
As a former projectionist, I can tell you that the sound from modern film projectors was not caused by this drive. If you ran the projector drive, you hear a slight clatter, as to be expected of the intermittent rollers. Most of the clacking actually came from the film expanding and shrinking due to the intermittent gear.
When a projector is threaded, a small excess loop is left above and below the aperture, as the project feeds film into the projector continuously; however, the film has to stop for the slit second light hits the aperture to create a clear picture on the screen. The loops above and below the aperture expand and shrink rapidly due to this stopping motion and create the known sound of the projector clacking.
And you always knew when the loops were too small. It would get stupid loud. Nothing annoyed me more when someone would thread one for me and not leave me any clear leader to check the loops before runtime. More often than not they would leave me with the head of the first trailer in the gate.
and the intermittent sprocket is controlled by the 'cross box' with is a four slot version of this drive. Film sound, both optical and magnetic, runs at a constant speed, normal 'standard' for 35mm film is 24 frames per second.
thanks Tyler Durden
I worked in a theatre with a film projector (a sort of "sensurround" theatre in a theme park) and most of the clatter on it was from the shutter between the lamp and the film. Before observing the operation, I had no idea that some projectors (if not all) had a shutter mechanism. (For those reading this who don't know, this smooths the image so you see flashing pictures rather than a massive streaked blur.)
thank you very interesting :)
Superb.
This guy does an excellent job of researching, executing (building / applying) and presenting to an audience (presenting w/ passion / why it matters to him) .
(on top of that, does the auto-cad, and posts the app files)
He is intrinsically watchable.
Keep it up.
Fascinating. I love how your channel is so packed with information. Very entertaining.
Instant classic Makers Muse video. Hacksmith dude! Now that's awesome he commented!
I am a Mechanical engineer myself and here I was thinking I knew everything there is know about Geneva mechanism. Boy, was I wrong. Much respect to the research put into making this video.
20 seconds in, I knew this would be an interesting channel. Thanks, man.
Never out dated, just another great idea created because it was needed.
Outdated in the sense of being replaced by a better version. Still a great innovation that encourages future inventors to think outside the box.
What version replaced this? It's a mechanical invention. Are you just saying that mechanical has been replaced by digital? It hasn't been replaced. It's more popular and has replaced in some areas only. It will never make sense in all areas.
As a protectionist on Christie protectors, we called the intermittent gear the Star Drive lol 😆
When I watch an impressive video series like some episodes of How It's Made I marvel at the machines that make some products but also at the design of the machines. And then that leads to an appreciation of who assembled and calibrated that machine.
Some years back, I worked on a machine that used a Geneva mechanism. This was an indexing drive that would advance a conveyor one step for each revolution of the main shaft. It was a cammed slot design in a cardioid pattern. As one had two cam followers and the drive plate had the slot.
The machine was an AMF 3-175 bread wrapper.
Outstanding vid! Extremely interesting and contains tons of accurate, well-conveyed information.
me: *sees title*
me: what section of the geneva convention does this break?
The Attrition Rate parameters!
😂😂😂😂
Look up 17:02 Nipples in the convention.
Geneva convention? More like Geneva suggestions
Me: *sees title*
Me: Oh. So it's just a suggestion.
Thank you for giving me new knowledge that's I'll probably never use but still satisfying to learn.
Thank you for posting this video; I found it very helpful in understanding the Geneva Wheel mechanism and some of it uses.
In regards to military use, Australian inventor Arthur Bishop utilized the Geneva Mechanism in his tail wheel strut for the Bristol Beaufort Bomber which was in use by the RAF during WWII. The book Driven by Ideas: The Story of Arthur Bishop, a Great Australian Inventor by Clare Brown talks about this in greater detail and includes photos of the gearing used.
makes sense! it doesn't move often, and the locking effect is very strong, just what you want in landing gear!
A clever guy, Arthur. His design was adapted to Adwest power steering for cars. Jags etc. Nice to use.
This is some very specific knowledge!
thanks! after not finding what i was looking for in google, i switched over to periodical databases and found this book.
What periodical databases might that be?
2:58 *DUDE!* I could've sworn an ad was going to play 😂
I'm Maltese and i didn't even know about this ! Fantastic vid , learned something new.
Followed up on the link you gave to The Great Courses Plus. Brilliant ! Trouble is I will be bingeing on episodes !
Very similar to the feeder drive mechanism on a 3"50 Twin Anti-Aircraft Naval Gun with "star wheel" manual loaders for each barrel.
Fascinating! I learned so much!
I LOVE your channel! You present a fascinating subject in a both enlightening and satisfying style. 👍👍👍👍👍
Much of the sound you hear in a film movie projector is the sound of the film being quickly advanced to the next frame by this mechanism as well as the shutter opening when the next frame on the film has been positioned briefly before being snapped closed again so the film can be advanced another frame. The film is kept with a certain amount of slack before the frame that is currently being shown on the screen. When the mechanism advances to the next frame, this slack is temporarily taken up, making the loudest contribution to the sound you hear when a move projector is playing a reel of film. This is why the projector is much quieter when you first turn it on to feed the film through the projector. The Geneva drive is still operating, but once the stiff film is fed through, the film its self makes all of the racket the way it is handled by the Geneva drive mechanism. Thank you fire sharing! I learned something new today! :)
instant sub :) awesome video - keep it up man!
Love from India
Military use: drum autoloader in a tank
Or machine gun?
3D printers must be a blessing for all engineers and mechanics :] I'm glad they are resourceful enough to learn and use it
This was actually a fantastic episode. Good job!
I very much enjoyed this video! Just thought you should know!
Also i love Chivalry.
In the sr-71 blackbird (world's fastest plane) used these to changed film roll for a 2 mile long film roll.
"North American X-15 This aircraft has the current world record for the fastest manned aircraft. Its maximum speed was mach 6.70 (about 7,200 km/h) which it attained on the 3rd of October 1967 thanks to its pilot William J. “Pete” Knight." sr-71 blackbird speed is like 50% of world record... but hey at least u trayed and plenty of people bought that! :P
Bialy I believe that Computerfrenzy probably was referring to airbreating, production aircraft. The "X" on any airframe refers to its experimental status, whereas the "SR" classification referred to an airframe that was was NOT experimental, but was instead a "Strategic Reconnaissance" aircraft. Also, the SR-71 IS the fastest airbreating aircraft in the world, and still holds many speed records until this day. If the new SR-72 ever goes into production, it will likely overtake the SR-71 in every respect, but until that day arrives, the SR-71 still reigns supreme.
The X-15 appears to be more of a manned rocket than a plane, and used as an experimental craft for learning more about applied physics at those kinds of extreme speeds as well as reaching outer space (how does one steer without wind drag over control surfaces, etc..). The SR-71 was, by comparison, a successful production craft. As such, probably fair to call the SR-71 the fastest _production_ airplane (declassified). ;)
D otA Yes. And that is essentially exactly what I said in my post above, in which I explained that the "SR" designation was used for PRODUCTION airframes, and meant "Strategic Reconnaissance" aircraft. Also, a very important distinction is that the X-15, in which the "X," by comparison, stood for "Experimental," was not an air-breathing airframe. It was a manned, small capacity (by comparison to other rockets) rocket ship, whereas the SR-71 was an air-breathing, bat-out-of-Hell go-getter. It's unofficial record of Mach 3.5+, in an evasion maneuver to avoid a bevy of SAMs coming its way over Libya circa 1985 (or was it 1986?) highlighted the peak performance of the Pratt & Whitney J58 engines, which could churn out as much as 150,000 kNs at altitude.
Hi Makers Muse. You mention drawing this in Fusion 360.
I am having big trouble learning how to draw any shaped object (such as this) in a 3d CAD program. What do you suggest? I've been trying to learn using Sketchup.
As for a military application, I have come across a magnification changing setup from a tank periscope: the changer is a drum with three positions that brings a different lens combination into the light path and has to do so very exactly.
Great video. I love the extra information.
Great video Angus, I like the way the channel is going!!
Some older gatling guns have a similar mechanism, where the firing pin is in a fixed location and the Geneva mechanism is essentially used to mechanically time when the firing pin mechanism triggers when a loaded barrel is in the proper position.
Thanks for that. I worked on feature films for a small number of films and was arround Panaflex and Arriflex cameras, and always wondered where that noise came from. Thanks much!
I can see that being used in ammo loaders.
Wow! Yeah!
Ammo loading is usually just lever or ratchet action induced by the weapon itself. Think revolver cylinders...
I was thinking more taking a round off of a rack and placing it inline with the chamber to be inserted rather than the act of loading it into the chamber.
I wasn't really considering hand guns in all honesty.
CK's channel. your a child charlie brown... revolver cylanders no our friend is correct it comes off a rack and loads it to the chamber, secrurely places it inside the chamber and fires it
German Luger used something similar to this
Boom! 10/10 educational and interesting content right there. That's a sub
I've had a brand new 3d printer sitting in its box for over 18 months now. It was a gift that i wasn't interested in. Ya know, i might just go ahead and start learning it. Thanks man, very neat video!
I *SO* needed to learn this for my invention! Thank you! You are an EXCELLENT teacher!
You are so welcome!
The IBM 514 and 519 card punch machines used a geneva drive to advance the card and hold it while the punch was driven into the card.
Terry Judkins Dude, that is OLD school, much like me
lol
Terry Judkins No they don't.
Good fact
they also helped the Nazis categorize Jews and other POWs
Terry Judkins you are thinking of the Geneva STOP
The great grand daddy of the sprag clutch, lol. The useful duties for the mechanism are low speed, or incredibly low mass parts (the tool caddy indexer, and the projector aperture/sprag respectively). Granted, not incredibly suited to cnc mill operations, but could probably find plenty of use in a pipe factory, or sawmill. As for military use, I humbly submit the breech mechanism of the Hotchkiss auto-cannon, a hand cranked mechanism used by navies world wide about a century and a quarter ago. You will also find them in rotating breeches of artillery, and lever operated "single leg" examples in vertical block sliding mechanisms for guns from Sharpe's buffalo swatters to modern field pieces. The "index detent" of the mechanism is nicely seen in Remington "rolling block" action of the 1860s, which was used by just about everybody at some time up until WW1. I call it "the age of cranks and cams" in arms design because such old ponies as this mechanism held the limelight and got all the girls in that era. Of course, those flashy knee action toggle joints sent them packing before long, lol
A sprag clutch is a type of one way clutch (the other common one is the ramp roller clutch which is commonly (and incorrectly) called a "one way bearing"), it has nothing to do with indexed movement. All it does is allow a shaft to rotate freely in one direction and stops it from rotating in the other. This is useful when you need to apply power to a shaft from an intermittent power source while allowing the shaft to spin freely in one direction when power is not being applied. A common example of this is a bicycle. Also large RC helicopters use them on then main reduction gear. The gear that drives the tail rotor is fixed to the mainshaft of the rotor and the reduction gear between the motor and the mainshaft has a sprag or ramp roller clutch so that if the motor stops it will not act as a brake on the rotor system and it will be possible to auto rotate to a safe landing.
Nice video.
Thanks for the depictions, helped with visualizing.
Thank you for a video I never knew I needed until I watched it...
Subbed you and will be playing catchup on the content.
Cheers, 👍🏼
Seee???!?!? there is more interesting things to print than fidget spinners!!!
Pablo Castaño Boom. Geneva drive fidget spinner.
Apparently even retards get bored, Who would have thought.
hahahhahah, ur right!
A Geneva on each of the three axis for a sloth.
Blasphemy !!!
There are Geneva Mechanisms in disposable cameras to keep the user from over winding.
Justin Bellotti Geneva stop*
Penis*
How have I not seen one of your videos before... amazing! So many youtube hours. Yet more to see :D
Very informative and interesting; thank you.
And also...nice: I have that shirt in blue, and in white with gray plaid. Glad to see it featured.
L00ks like that someone thought it up in the "spur of the moment"
Cool? Yes!
Entertaining? Yes!
Handy to know? No!
Hotel? Trivago!
TheRedGhost sly undercover advert in your meme
Hail Corporate.
Good to know if you want to build/repair a multi tiped machine like he showed
As if we haven't seen those adds enough on tv, they'll start to invade YT comments now, too lol
Well that's gay...
5 stars! Amazed by your enthusiastic and intelligent presentation. This one video took a lot of work! Equally impressed by the intelligent and interesting comments by the audience.
Interesting stuff. I've just discovered this channel and look forward to watching more.
WTF dude, this is too awesome and intellegant for a dumb toymaker like me. i really enjoyed this one, i gotta say for me this is one of my all time favourite of your vids. Awesome stuff thanks for all your efforts on this. as a watch collector i was geeking out on this!!!
Henry Mayer Svarczkopf intelligent *
villie91 inniitelliganitelegant*
Werner Van Rensburg elephant*
villie91 elegant intelligent elephant?
+Werner Van Rensburg elegant illuminati elephant.?
OK TH-cam I CLICKED IT NOW GET IT OUT OF MY SUGGESTIONS
Now you've just confirmed that its suggestion was relevant to your interests, so it will keep doing it.
not if I sub and then unsub!
wow you broke youtube, you win, you so smart, i evny
+Free Diugh That's not how this works.
MAH BOI
Nicely done video, concise and straight to the point! As mentioned by someone else, this is where youtube shines
"Such is also the harsh logic of industrial automation. All that we had previously achieved mechanically by great exertion and coordination can now be done electrically without effort. Hence the specter of joblessness and propertylessness in the electric age. Wealth and work become information factors, and totally new structures are needed to run a business or relate it to social needs and markets."
[Understanding Media, Marshall McLuhan, 1964, Ch. Automation]
Huh, great quote.
I had to design this in my engineering class, so difficult
“Geneva Drive” sounds like a blackbox core system of some giant fighting robot
One of the first things I was ever told to build in AutoCad, that actually intrigued me. The build process is pretty simple in Inventor. I have yet to use Blender but I'll definitely try it out. in the future.
i made this for my degree mini project out of wood .Thanks for video makersmuse.
thank you, i actually never knew that about the geneva mechanism
Being Maltese, right away I'm like "That looks like a Maltese cross!"
I suppose when Star Wars shows in theatres there, Han & Chewie drive the *Maltese Falcon?*
Go ahead, roll your eyes. You know it's funny.
@@stevejordan7275 did roll... did laugh ... ; D
In Russian it is called “Maltese cross” or “Maltese mechanism”.
I wish I had the time to watch all these interesting but not very important channels on youtube. This video is great :)
Your presentation is top notch!
Well done, sir! :-D
The Geneva stop's purpose is not prevention of overwinding a watch mainspring. Actually, the "overwound" spring is a myth. Mainspring breakage is by fatigue. If you intentionally try to overwind a watch, anything in the winding mechanism will break before the spring, probably including that stop! No, the stop was there to eliminate the very weak and the very strong torque of the spring at the beginning and end of winding. Out of 6 possible turns of the barrel, only 4 were used. The spring is "set up" one turn and stopped at the 5th. In this way, the spring is used where it gives the least variation in torque. Earlier watch movements were more sensitive to torque fluctuation, making their rate erratic. Modern mechanical movements have overcome this flaw almost completely by various means, so the stopwork is no longer needed.
What absolute BS!
"No, the stop was there to eliminate the very weak and the very strong torque of the spring at the beginning and end of winding." That's RUBBISH!
The ingenious backward and forward movement of the escapement mechanism (pendulum or wheel)allows for the varying spring force. That's the whole point of it!!!!! That's why spring powered clocks tick loudly when fully wound and softly when running out, but still keep correct time until they stop.
Jesus Christ, I just can't...
Remo Peter overwinding the spring doesn't break it but it does cause them to lose most of their tension. Thats why a lot of old clocks and watches tend to only run for a few hours before needing wound again
And when does a spring break from fatigue? If its overwound agin and agin.
John Somerset - While it's true that a mechanical wristwatch can handle the varying torque from the main spring unwinding, I believe some of the most accurate pocket watches used a fusee to even out the force of the main spring. I am no expert, but I would not call the varying force a feature, but rather an engineering challenge that needs to be dealt with.
On older Warships they use the Geneva drive the turning of the guns because they had to set them at a degree.
Today it's used in nuclear bombs. It's all a game of timing in nuclear bomb cuz they have to decide the timing of explosion of first two isotopes.. There this mechanism is used
We used one in aircraft navigation equipment, the antenna had to switch wave guides and used a Geneva drive. First thing we did troubleshooting the aircraft for problems, put our ear to the cargo bay and listen for the "clack" of the Geneva gear.
This drive is also used in old Bell & Howell MailStar inserters. I've had to rebuild a few when servicing these machines.
Early film projectors? Try almost ALL film projectors.
Can confirm, I've been a Cinema Projection and Sound technician for the last 14 years. These were part of the intermittent sprocket assembly for every 35mm projector I serviced right until they all went to the scrapyard during the digital projection rollout.
Andrew Tetour Ah yes, the mob-like genocidal revolution that still brings me to tears.
eh, I suppose there's an old charm to them. But film cost a fortune, and it's not like too many people would have gone and bought them.
Not quite. Cheaper projectors used a claw to advance the film; not good, could tear the film. Better projectors used this mech. Were always called maltese cross in projector parlance.
Exactly - AFAIK some were made with stepper motors, but I never saw a 35 mm projector with anything but a Maltese cross. They only went out of use with the switch to digital. My engineering student friends were thrilled to see the schematics.
The characteristic sound is not, however, from the mechanism - it's from the two loops of the film, one on each side, to allow the film to run smoothly through the rest of the machinery while being pulled frame by frame through the film gate, and you could hear at a distance if they were the right size. You'd have the same sound (or most of it) with a stepper motor.
M 60 machine gun The 501 machine gun are line types of the Geneva drive just linearly design of it and is how the fresh ammo is loaded into these machines I was an ordinance NCO through the racks to Sargent Us. Army retired
I've replaced/serviced a few geneva drive gear boxes in my day when I worked as a projectionist. :) The head units I operated used sealed boxes so changing the oil meant removing the whole thing. Eventually someone wised up and added a port glass(for inspecting oil level/cleanliness), fill, and drain plugs so you didn't need to pull out the whole unit just to change the oil. I think Kineton was the first to do that.
You may find it was a Century innovation. The Kinoton version has the glass in the rear of the intermittent whereas the Century had it viewable from the front.
Excellent presentation.
The knitting machine industry during the 1970s experimented with epicyclic cam follower profiles on the 'slot and pin' portion of the Geneva mechanism to eliminate the instantaneous acceleration in the Maltese cross design. The use of epicyclic profiles (aka- railroad curves) quickly moved to the kinematic based cam profiles that operated the latches on the knitting needles .... and with the result of those knitting machines could then operate at 10X faster speeds and with significantly less constant needle latch fractures.
IVe seen old lock mechanisms for doors that employ an aspect of the Geneva mechanism.. By "old" I mean the mid nineteenth century. Military application? I expect the Gatling Gun used the Geneva and possibly the invention that permitted WWI fighter pilots to have their machine gun mounted between the cockpit and the propellor and timing the precise firing of the bullet to occur in the time frame whereby the ......its way too early in the morning. Thanks for producing this, it was intensely interesting.
A.G. M. The Gatling gun was actually gear driven directly from the crank and ammo was fed in by a high tension spring in the magazine
I have one in my Subaru for some reason
The interrupter gear on aircraft was actually simpler than that: the propeller of an aircraft actually rotates faster than a normal machine gun can reasonably be expected to fire, so there's no point 'interrupting' the gun from firing when a propeller blade is in its path because usually when this occurs the gun is not ready to fire anyway (it's busy loading the next bullet). Instead the gun was modified to only fire once per trigger pull, similar to a semiautomatic rifle. A combination of a cam on the engine and a set of levers coupled to the pilot's firing button pulled the gun's trigger once per rotation of the propeller whilst ever the pilot had the button held down. This resulted in the gun automatically firing at a slightly reduced rate that synced up with the propeller.
Good explanation .. only slight error was the bit about overwinding a watch.... being a watchmaker myself the overwinding is wrongly identified...what really is happening is the mainspring has been wound up to its tightest and from here something in the watch gearing is preventing the mechanism from "running down" thus preventing the mainspring from returning to its relaxed position
Thanks for the clarification! I would add an annotation if TH-cam still allowed for them...
The Brunswick A and the A-2 pinsetters for bowling used a pair of Geneva cams to shift the moving deck back and forth to allow for the setting of the bowling pins.
Such a clever mechanism! I'm sure the wear would be greatly reduced if the pin itself was not fixed but rotated on a central axis.
"HAVEN'T YOU HEARD OF NO GENEVA CONVENTION?!"
Thanks, I enjoyed it. You were asking about military applicatoins. Don't tanks roll-forward using similar mechanism?
If you're looking for military application, the rotating-barrel gatling gun spins to reduce heat wear on the barrel and uses a similar mechanism to hold the barrels in place while the bullet is traveling through it, rotating to the next barrel once it's clear.
MIND BLOWN
bachelors of trolling degree, 2013 lol
They should use this in vending machines.
Whys that?
In the clip at 3:20 the drive wheel rotates and stops, what's the point of the geneva mechanism here if the drive wheel isn't continuous?
Back in the '70s EMI Medical used this to drive the rotation of the first whole body (CAT)scanner. It was also used to drive the rotation of British tank turret control. No matter where the turret points the turret gun is locked in position for firing.
the military use for this drive is on jets with rocket launchers, it's the mechanism that loads the next rocket after one is fired. also used to load cannon fire , torpedos, machine gun fire on 360 degrees swivel gun
Well, as much as we have modern automation with stepper and servo motors, sometimes it’s still best to use the old tech that’s as reliable as clockworks!
::Spock voice:: Fascinating...
very well detailed and Beautifully presented, I'm officially a Fan, HUGE-NOMOUSE SHOUT OUT FROM "LIMPOPO" SOUTH AFRICA
Very well made video. Really well researched and professionally made
Fascinating - thank you for posting this, and you're super-cute!