The model (Blender + STEP) is available here: sketchfab.com/3d-models/ferdinand-berthoud-fb-1l1-af79fc585d264665b4713fb7912cdbea

@@cyamahat It is not free :(

@@lamngoc9896 You can still download other models from me on the same platform or on GraCAD (grabcad.com/c.yamahata-1).

"Them"?

Yes, the keyword is "detent escapement". It can be seen in this 3D modele of the Maestoso: kzbin.info/www/bejne/mKC9m6ihbamkaJIsi=NmXv0sd8q16Cf4Aw

The mechanism relies on the elastic properties of material. Each beam is a flexure. Examples of applications: micromotor / watch mechanism > kzbin.info/www/bejne/pGS8fp2dl82piqM / skfb.ly/onpX6

Вначале показалось, что спуск постоянной силы, а потом нет, просто избыточное усложнение.

Raymond Scott, "Domino" ( kzbin.info/www/bejne/Y5O5g4qKeat1Y6M )

Full version was found on archive.org > archive.org/details/HowaWatc1949 (downloadable). It can also be found on KZbin: kzbin.info/www/bejne/qH2TkKmFrJuYecU (Hamilton's channel).

Hi John, For these experiments, we used 80 V signals and microstepping (see the sequence at the beginning of the video). To answer your question, I have reproduced below some lines from a technical report we prepared at the time. You can of course find much more information in the scientific paper indicated in the description of the video ( dx.doi.org/10.1109/JMEMS.2010.2040139 ). -- The rotational speed is determined by the stepping frequency and by the motor torque. The torque decreases as the speed increases. The motor could be properly operated (without skipping steps) up to a stepping frequency of 5000 steps/s, which corresponds to an angular speed of 0.83 °/ms (see the last sequence of the video). Note that this speed could not be achieved using a half stepping sequence because the torque varies too abruptly in such case. To achieve higher speeds, we used microstepping with ramping signals. The 3-phase voltages were ramped up and down in 16 microsteps.

No problem. Remember that this is a shortened version of the original movie ( archive.org -> archive.org/details/HowaWatc1949 ).

You can check my profile on GrabCAD to get that model.

@@cyamahat Thanks.

Try with this 3D model (virtual pivot): sketchfab.com/3d-models/virtual-pivot-def951bf1f7a4088bb72c57a07900aa3 This can be 3D printed but the beam should be made thicker.

@@cyamahat how many degree can it rotate?

@@cyamahat I actually wanted to find a way to 3D print a revolute/hinge joint (1 dof for rotation) that link a tool to an robotic arm which can return to original position without external force and can comply. Do you have any idea how it can be done?

@@lhlee1580 +/-15° (30°) with this design -> dx.doi.org/10.1109/JMEMS.2012.2189367

@@lhlee1580 Maybe you can find something inspiring from Jelle Rommers's work kzbin.info/www/bejne/enLRmJavnLpqqsU

Thank you for the message. The HQ video is available here: christophe.yamahata.fr/videos/Egyptian_Fruit_Bat_in_Slow_Motion_(HQ).mp4 - You should also visit this website: tabletopwhale.com/page13/ (Eleanore Lutz) - Finally, the original video is available on KZbin: kzbin.info/www/bejne/j4Wuf416n7iUjrM

Thanks for the comment. The CAD file was prepared with Spaceclaim (any other CAD sofware would work), then converted in STEP format to animate it in Blender. Final step for rendering was completed on sketchfab.com . Unfortunatelly, the lawyers from IWC didn't like my work at all (a kind of consecration, although frustrating): they forced sketchfab to delete my file and I just had a few hours to take this screen capture. You can download the CAD file on Grabcad if you wish. I let you find it by yourself (for the reason mentioned above...).

?? Well, I made this animation. If you follow the link, you can get the 3D model.

@@cyamahat Thanks a lot Christophe. My actual question was about the knowledge behind the video. Did you disassemble the watch and to figure out its mechanism?

@@arawolf1990 If you check the video at 0:52, you will see a photograph of the calibre. The model is based on pictures found on the Internet, as well as on Pallweber's patents and simplified schematics found on the website of the brand.

@@cyamahat Thank you so much for the info. you did a nice job my friend.

You may find all useful information for the caluclations in this article: www.researchgate.net/publication/254060012_High-Angular-Range_Electrostatic_Rotary_Stepper_Micromotors_Fabricated_With_SOI_Technology

Energy comes from the mainspring (right hand side in the giant in-line movement). You can check the originial video (archive.org/details/HowaWatc1949) to get a clear explanation of the working principle.

Christophe Yamahata but I mean only the part of fork, balance wheel and escape movement. Now I've noticed that the escape wheel push the fork only because of perfect shape of pallet jewel. This is the most important part of the video. The escape wheel has the teeth which slides thru the pallet jewel only because of the perfectly shaped jewel. Tooth pushes the upper pallet jewel which makes the fork swings than the balance wheel moves. Hairspring makes the move stop and than move the balance wheel back. The balance jewel pin pushes the fork which release the escape wheel by the lower pallet jewel. That's it.

Here is a 3D model of a Swiss lever escapement: skfb.ly/LIwX. It shows step by step what happens.

Thanks that`s what I thought. Now it`s clear.

Christophe Yamahata - that archive link has since vanished. Any idea where that video can be found?