- Видео 13
- Просмотров 53 794
P. Hefetrueb
Добавлен 14 ноя 2012
Timelapse of a Harrison-inspired wooden grasshopper clock
12 hours of operation of my wooden wheeled, selfmade grasshopper clock inspired by John Harrison, compressed to 3 minutes by a factor of 240. I could watch this forever...
Просмотров: 483
Видео
Regulating a gridiron compensation pendulum for a grasshopper clock
Просмотров 49510 месяцев назад
For my wooden grasshopper clock built according to the principles of John Harrison (see ruclips.net/video/N-wm39a6r_k/видео.htmlsi=V65izJj7tI2htflB), I'v made a case and a new pendulum. I wouldn't be a Harrison clock without his most famous invention, the gridiron compensation pendulum. I'm also showing a few first measurements of the clock's accuracy and its barometric compensation.
Making a wooden grasshopper clock according to John Harrison's principles
Просмотров 14 тыс.Год назад
Making a wooden precision pendulum clock with grasshopper escapement according to John Harrison. The sculptural clock was self-built from multiplex, lignum vitae and beryllium bronze using mainly hand tools. Friction was reduced by self-lubricating bearings made from lignum vitae, by anti-friction wheels and by knife-edge bearings. The pendulum has adjustable temperature compensation pendulum, ...
Wooden Grasshopper clock, first test run
Просмотров 14 тыс.2 года назад
Finally, my wooden clock with twin-pivot grasshopper escapement according to John Harrison came to life for the first time. The balance is only a temporary and coarse substitute for the compensation pendulum still to come. The composers still need some refinement to reduce the bouncing of the pallets, especially visible at the entry pallet.
Anti-Friction-Wheels, Harrison Style
Просмотров 1,8 тыс.2 года назад
Demonstration of the virtual absence of friction, using anti-friction-wheels according to John Harrison in a wooden clockwork.
Wheel cutting for a wooden clock using a scratchbuilt pantograph router
Просмотров 4362 года назад
A scratchbuilt pantograph router being used for cutting wheels for a wooden clock project out of beeckwood multiplex.
Spundschraube (Sternschraube) eindrehen
Просмотров 1,4 тыс.10 лет назад
Behelfsmäßiges(!) Eindrehen einer Spundschraube mit Sternverzahnung in ein Stichfass (Bauchfass mit bayrischem Anstich) mit einem Hammer als Werkzeug
Vierkant-Spundschraube eindrehen
Просмотров 1,1 тыс.10 лет назад
Verschließen der Vierkant-Spundschraube eines Stichfasses (Bauchfass mit bayrischem Anstich) mit einem Zimmermannshammer als Schlüssel
Spundkorken einschlagen
Просмотров 2,5 тыс.10 лет назад
Verkorken eines Stichfasses (Bauchfass mit bayrischem Anstich) mittels Rundholz und Holzhammer.
Mechanisches Faultier
Просмотров 57611 лет назад
Lustiges Ferienprojekt mit den Kindern: Mechanisches Faultier, das mittels Kurbelschwingen am Seil entlangklettert. Brassie, the mechanical Sloth: Sloth Robot climbing on a rope by means of Hoekens four-bar linkages
Gleisfünfeck von Mals (Vinschgau) als H0-Modell
Просмотров 14 тыс.11 лет назад
Modell des Bahnhofs Mals im Vinschgau mit funktionsfähigem Gleisfünfeck (Wendestern) zum Drehen von Dampflokomotiven der Vinschgerbahn. Plastico della stazione di Malles Venosta con stella fonzionante.
Sloth Tramway 1
Просмотров 37411 лет назад
Multibody simulation of a hanging walking machine, moving like a sloth along a rope. It is using the Hoekens four bar linkage, resulting in an almost straight line motion of the claws.
Do you know where I could obtain a copy of "John Harrison's Contrivance"?
Please try west Australian wandoo❤️ A hard wood with unique properties 🌿
Great work! Are plans available for purchase anywhere?
Sorry, unfortunately not. My sketches and calculations are far from being self explanatory, I'm afraid, and most parts were traced directly on the wood before cutting the out, so the drawings are lost anyway.
I know it's only been 4 months, but I'm curious to know how you are getting on with regulating this clock? And have you made any modifications?
Клас 😊❤
A clock for the ages…
No thanks. I'll use my CNC router.
Lazy.
yeah but how would u get the fine teeth for the gears?
You sir are positively brilliant
Loved this description and the clock you made. Thank you for sharing. Likely I am wrong but I thought the over-riding reason the clock loses in denser air is because of increased buoyancy; the pendulum is effectively floating more? Increased air resistance and displacement has a lesser effect? All good to think about!!!
I really wish I could buy a kit to assemble this
awesome and thanks for sharing with us.
Great work, I love how you’ve laid it out and for easy removal. Are the plans available 🙏👌
Sorry, plans don't even exist. Just heaps of calculations and not-to-scale sketches, but almost all parts were spontanously traced directly on the wood or brass before cutting them out with a jigsaw.
Fascinating, thanks for sharing all this info. I'm curious how you decide which point on the slope of the "hill" curve you want to be? Do you just have to run it with some arbitrary drive weight for a period of time and plot the rate against the air pressure, and adjust drive weight from there?
Exactly, I'm heading towards some patient try and error. The hill test is for determining a range of amplitude where to look.
That’s very cool, I’ve always wanted to be able to do that
Wie heißt denn das Lied am Anfang des Videos?
"Tick Tock" von Jimmy Fontanez, lizenzfrei aus der Audio-Mediathek von youtube.
Hermoso reloj!! Felicitaciones
Would have loved to hwar the tick. Grasshopper escapement is reportedly quieter than most other escapements.
It is amazing to see this clock and it is beautifully made. I have made several wooden clocks with different escapements, as this is the bit I am most interested in. I made a grasshopper escapement clock about 25 years ago which is still running well. It does not have the low friction devices or temperature compensation you have but it does keep pretty good time. I used wooden gears with metal pin lantern pinions and the pivots are piano wire running in brass plate. I first made just the grasshopper escapement on a simple shaft which I adjusted until it ran well then made the final version for the clock.
Out of interest. How accurate is your clock?
I'm still not finished with regulating, and might try another pendulum (real grid-itron pendulum), but so far it repeatably keeps the second over 12 days (less than 1ppm)
Brilliant. Very inspiring.
The music blotted out the actual tick sound. Otherwise, very nice work.
Very impressive design and manufacturing process. Much to digest here. Which will require repeat watching of the video. I like the premise that oil, the bane of precision mechanical timekeeping is forbidden. Three questions readily pop to mind. I am sure there will be more to follow. 1.What advantages do beryllium bronze pivots over a polished stainless steel pivot? Coefficient of friction? Obvious advantage over hardened and polished or burnished steel would be corrosion resistance in absence of oil. 2. Why not just use the glass mercury switch as the primary winding switch rather than the backup? I have never known a mercury switch to fail. 3. What motor and voltage is being used for the remontoire? Thank you for producing and sharing the video of this well thought out expertly engineered and crafted "Harrison" type clock.
Thanks for your kind reply! Ad 1: No specificic reason, apart from the fact that I simply wanted to avoid steel or iron metals, as Harrison did to avoid corrosion in salty sea air. He used simple brass pivots. Salty air is no problem for me, but I simply like beryllium bronze. Ad 2: No specicfic reason either. Originally, I had in fact planned only a simple mercury switch operated by the weights. But triggering the windup every hour gives more time reserve in case of el. power outages, and a reed contact causes less reaction force on the minute wheel.
What type of bearings are your anti friction wheel arbors mounted in?
They have lignum vitae hubs, running on fixed axles (2mm dia beryllium copper wire)
@@p.hefetrueb2674 Ah, thanks! Do you believe ceramic bearings would improve the friction coefficient?
Eine absolut genial konstruierte Uhr. Auf das Wesentliche bei der Konstruktion beschränkt. Gratuliere zu diesem Meisterwerk.
Cooles Video !! Bin gespannt, wie genau sie geht
Das würde mich auch interessieren.
After a little regulating, it stays well below an error of +/-1 second over a period of one million seconds (~12 days), being less than 1 ppm. Not to bad for a homemade clock from plywood.
@@p.hefetrueb2674 good job. Any chance you might release svg or cdr files so anybody can use a lasercutter to rebuild your watch?
@@raphi72 Unfortunately no way. As I said in the video, there are no CAD data. For most parts, there even are no paper drawings, as I traced them directly on the wood before cutting them out.
@@p.hefetrueb2674 clear photographs of each part separately from the same distance would probably be enough. It should be possible to extract paths from the bitmap as long as there is enough color difference to the background. Optimal with a ruler at the edge.
Das ist kein Fleis-5-Eck sondern ein Gleis-3-Eck!
Die Gleiskonstruktion nennt sich "Wendestern". Ein Gleisdreieck ist eine Gleisanlage, die drei Bahnhöfe so miteinander verbindet, dass man von jedem Bahnhof alle beiden anderen Bahnhöfe des Gleisdreiecks aus Sicht des Startpunktes erreichbar sind.
Warum nicht gleich links herum mit Weiche 🤷♂️
Pierre leroy also did something similar in a pocket ships chronometer with an extra rotating wheel 3 on each side on the balance.
Eine Drehscheibe wäre billiger, platzsparender und effektiver gewesen.
Darum geht es nicht! Es gibt Orte, an denen eine Drehscheibe nicht ganzjährig betrieben werden kann: z.B. bei starkem Schneefall im Winter
@@michaelk.9603dafür gibt es gedeckte (ÖBB, RHB, BLS) oder überdachte Drehschei ben, siehe Alpine Tunnel in Colorado oder in Alaska. Es geht hier nur um K&K Platzverschwendung 😂😂😂
so nice and beautiful dear
👍👍
How ingenious
May I ask what the toothless wheels are used for?
They are so-called anti-friction wheels, also invented by Harrison. Compared to friction bearings, the pivots of the escapement wheel have no sliding contact, but only rolling contact, reducing friction by orders of magnitude. A test can bee seen at ruclips.net/video/O0cdUBRlKp8/видео.html
@@p.hefetrueb2674 thank you! :)
😢 p͓̽r͓̽o͓̽m͓̽o͓̽s͓̽m͓̽
The gear looks great and your pantograph router looks really accurate. That is something I always wanted to try since any errors in the template should be minimized.
Würde als Spundschraube auch ein normaler Korken (natürlich in der richtigen Größe) gehen, oder würde der einen schlechten Geschmack aufs Bier abgeben?