About Lego Clock Chronograph

[kotax]

I am not an English speaker so I use a translation site. So the text may be strange in places.
I'm trying to build a chronograph with Lego, but I don't really understand how the reset works. So if anyone knows how the reset works or how to make one, I would love to know.

[Davidz90]

Hi and welcome to the forum!

 

Usually, in real clocks chronograph uses a whole set of special-shaped cams to do the job; see: https://www.fratellowatches.com/understanding-the-mechanical-chronograph/#gref

That is difficult to do with Lego. However, a simpler option is to use a weight on a string or a pullback motor attached to the chronograph hand. Then, you need some sort of a clutch to:

1. Connect the hand to the clock. Hand goes forward and lifts the weight or winds up the pullback motor.

2. Stop the hand.

3. Disconnect the hand from the clock. Weight/pullback motor resets it.

[kotax]

8 minutes ago, Davidz90 said:

こんにちは。フォーラムへようこそ!

 

通常、実際の時計のクロノグラフでは、特殊な形状のカムのセットを使用して機能します。詳しくは、  https ://www.fratellowatches.com/understanding-the-mechanical-chronograph/#gref をご覧ください。

レゴでそれを実現するのは難しいです。しかし、もっと簡単な方法としては、紐に重りを付けたり、クロノグラフ針にプルバックモーターを取り付けたりする方法があります。そして、以下の機能を実現するために、何らかのクラッチが必要になります。

1. 針を時計に接続します。針が前進して重りを持ち上げたり、プルバックモーターを巻き上げたりします。

2.手を止めます。

3. 針を時計から外します。重り/プルバックモーターが針をリセットします。

Oh, this is a good idea. How do you attach the weight?

[Davidz90]

Two ways:

1. Weight on a string, hanging from a spool

2. Weight on a lever, connected to the hand with some high gear ratio.

[kotax]

I see, so that's how you did it. I will try to make it your way. Thank you very much!

7 minutes ago, Davidz90 said:

2つの方法:

1. 糸巻き機から吊るされた紐の上の重り

2. レバーに重りが付いており、高いギア比で手に接続されています。

I see, so that's how you did it. I will try to make it your way. Thank you very much!

[kotax]

I was looking up videos of clocks with chronographs made out of Lego. Then I found this video.

How does the chronograph reset in this video work?
 

[Davidz90]

It seems that by pushing a button, he pushes some lever to a horizontal or vertical position. The lever is connected to the hand with some large gear ratio.

[kotax]

Thank you for your thoughts. Could you please tell me how to make the reset part of this video?

[Davidz90]

Unfortunately, I have no idea how it looks exactly.

However, here is a mechanism I have built just now:

I hope this will give You some ideas.

[kotax]

Oh, this is great! Thank you for taking the time to do this. I did not have this idea. I will take it as a reference. I may have another watch-related question like this. Please let me know if you do! Thank you very much!

Edited 22 hours ago by kotax

[Davidz90]

6 minutes ago, kotax said:

I may have another watch-related question like this. Please let me know if you do!

Sure, feel free to ask.

[Davidz90]

I have found one more good explanation of how this works: