How a Mechanical Watch Works

Mechanical watches have no battery, microchip, or circuitry. Watch parts are machined to near perfection at microscopic sizes and tolerances and can produce accuracy within two to three seconds per day.

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0:00 Intro
0:44 Crown
1:36 Mainspring
2:14 Wheel Train
2:57 Jewel Bearings
3:11 Motion Works
4:10 Escapement & Balance Wheel
6:38 Supporting Structure


  1. You should do an animation on the gun that Alec Baldwin used to accidently kill the cinematographer. Would be interesting to see how the internals work so that it cant fire unless the trigger is pulled.

  2. Wow! Beautiful animation! Thanks so much for creating this! Being a watchmaker I did notice a couple of items that I wanted to point out: The top, balance cap jewel should be slightly domed on top. It looks flat in the animation. The bottom cap jewel is shown with a hole in it. Did you mean to do that so as to show the bottom balance pivot? If not it should not have a hole. The "balance bridge" is actually a "balance cock". Bridges are usually secured at 2 or more places with screws on the main plate. Cocks are usually only secured in 1 place. Nit-picky I know :-).

  3. Could you do topics like these specifically for medical students discussing how organs such as the heart works as well as other organs and tissue within the body.

  4. This is the most amazing visual breakdown and explanation of how a watch works. As my dad used to repair them for a hobby some 40 years ago, I've always wondered how they worked and now you have given me an insight. Thank you.

  5. This is helping me reassemble a watch I bought after I took it apart to add a missing second hand, and this is astonishingly helpful! Unfortunately it's not quite the same as the diagram in this video, but it's similar enough that I can understand the basic terminology.

  6. Help me to understand from where is the power to make the first tic.
    The clock is run out (the spring is unwinded). The clock is stop.
    Fork is not moving, balance wheel is not spinning (balancing). The jewel is blocking the escape wheel by the last beat of the system.
    We start winding the clock and the power from main spring starts to rotate the wheels one by one until the escape wheel is powered.
    This is the magic moment.

  7. the people that want illiegbeing al and economic migrants to come to uk are you going fork out to keep them because the only people that are being made too suffer are pensioner's

  8. in case anyone's wondering, this is a Unitas 6497 handwind movement. this movement is originally designed for pocket watches. so it's quite big. it only fits into big watches (at least 43mm in diametre). that also means it's one of the easiest to take apart and study since the components are also proportionally big. and it's also one of the simplist in terms of complications. most watches nowadays have at least a winding rotor (an asymmetrical weighted rotor that winds the watch powered by your wrist movement) and a date function (an additional 24-hour counter with 31 clicks per rotation). not to mention some of the more complex functions like chronograph (stopwatch), minute repeater (chimes the precise time o the minute) and tourbillon (a revolving escapement) etc. imagine doing all those purely mechanically within the space of a wrist watch. then imagine these technologies existing 200 years ago. yes they did.

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