Safe to reset the Daytona chrono when the watch is hacked?

[3omar]

I don't know enough about the Cal. 4130 movement to be able to figure this out. In short, is it safe to do the following:

- While the watch is running normally, start the chrono

- At some point, a few seconds or a few minutes, stop the chrono

- Pull the crown to stop the running seconds

- While the watch is stopped, reset the chrono

- Push the crown to restart the running seconds

It doesn't matter why I want to do this. I could explain, if someone is interested... I am just wondering if it would be bad for the movement in any way. Anyone with knowledge of the Daytona's movement care to chime in?

[77T]

Your question is unusual, but not impossible to understand.

In the sequence you outlined, the vertical clutch would have isolated the chrono module from the running timekeeping running gear train. For that reason, resetting the chrono module should have no ill effect whether the timekeeping is running or not.

Changing the steps around is not advised (that is, resetting the chrono while it is running).

Now it’s your turn - what real world use case needs such an unusual operation?


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[samuel019]

Done it many times while resetting the time after it hasn’t been worn. I like to set my watches to the second when winding back up

Never had any issues and my 515 is the most accurate Rolex I own. Literally has went almost a month and only gained 1 second using the same app that I set it by

[3omar]

Originally Posted by 77T

Your question is unusual, but not impossible to understand.

In the sequence you outlined, the vertical clutch would have isolated the chrono module from the running timekeeping running gear train. For that reason, resetting the chrono module should have no ill effect whether the timekeeping is running or not.

Changing the steps around is not advised (that is, resetting the chrono while it is running).

Now it’s your turn - what real world use case needs such an unusual operation?


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Thank you, Paul. That's good to know. I will go ahead and try it.

The reason that I want to do this is to be able to use the chrono seconds hand as a guide when I am setting the time in order to get the main minute hand to point exactly to the correct minute marker on the dial.

The thickness of the chrono seconds hand happens to be just right to hide the lume on the minute hand fully when they're both aligned. So, I want to use this fact to get the minute hand perfectly aligned. I know that the watch will lose or gain a certain number of seconds per day. I don't mind that, it's part of owning a mechanical watch. What I want to do is get the minute hand to align perfectly with the minute markers every time the sweeping seconds hand hits "60".

So here are the reasons for the steps in my original post. Assuming that I am attempting to set the watch to, say, 7:00, I would start this process at, say, 6:58:

- Start the chrono: this is so that I can get the tail end of the chrono seconds hand out of the way of the running seconds subdial at 6 o'clock.

- Stop the chrono: here, all I want to do is stop the chrono when the chrono seconds hand is somewhat horizontal, so it's completely out of the way of the running seconds subdial.

- Pull the crown to stop the running seconds: here, I would wait until the running seconds hand reaches the exact top of the subdial at "60" and then stop it. With the chrono seconds hand out of the way, this would be easy enough to eyeball.

- While the watch is stopped, reset the chrono: now that the running seconds hand is stopped exactly at the top, I would reset the chrono so that I can use the chrono seconds hand as a guide. I would then move the big hands to 7 o'clock, and make sure that the main minute hand lume disappears perfectly behind the chrono seconds hand.

- Push the crown to restart the running seconds: as an accurate clock strikes 7:00:00, I would push the crown in to restart the watch.

I don't know if this post gets the OCD gold medal of 2022, but misalignment generally bothers me, especially with precision instruments. I am able to get the minute hand aligned properly in other positions, but it's quite hard. It seems to me that using the chrono seconds hand as a guide would make the job easier.

On another note, my watch runs a little fast, which I really like because when I need to set it (once a month or so), all I need to do is hack it and wait, then restart it, without having to move the minute hand at all. So my alignment is preserved. If it ran slow, I would need to do this alignment routine every time I set the watch.

Ok, enough splitting hairs... Merry Christmas, everyone!

[Andad]

As you said, there is an easier way.

[Presa canary]

Once jailbroken you should be good to go

[brucethemanlee]

Interesting

[Shauz]

Originally Posted by 77T

Your question is unusual, but not impossible to understand.

In the sequence you outlined, the vertical clutch would have isolated the chrono module from the running timekeeping running gear train. For that reason, resetting the chrono module should have no ill effect whether the timekeeping is running or not.

Changing the steps around is not advised (that is, resetting the chrono while it is running).

Now it’s your turn - what real world use case needs such an unusual operation?


Sent from my iPhone using Tapatalk Pro

Don't have a Daytona, but could you elaborate what NOT to do?

[brandrea]

Originally Posted by 3omar

Thank you, Paul. That's good to know. I will go ahead and try it.

The reason that I want to do this is to be able to use the chrono seconds hand as a guide when I am setting the time in order to get the main minute hand to point exactly to the correct minute marker on the dial.

The thickness of the chrono seconds hand happens to be just right to hide the lume on the minute hand fully when they're both aligned. So, I want to use this fact to get the minute hand perfectly aligned. I know that the watch will lose or gain a certain number of seconds per day. I don't mind that, it's part of owning a mechanical watch. What I want to do is get the minute hand to align perfectly with the minute markers every time the sweeping seconds hand hits "60".

So here are the reasons for the steps in my original post. Assuming that I am attempting to set the watch to, say, 7:00, I would start this process at, say, 6:58:

- Start the chrono: this is so that I can get the tail end of the chrono seconds hand out of the way of the running seconds subdial at 6 o'clock.

- Stop the chrono: here, all I want to do is stop the chrono when the chrono seconds hand is somewhat horizontal, so it's completely out of the way of the running seconds subdial.

- Pull the crown to stop the running seconds: here, I would wait until the running seconds hand reaches the exact top of the subdial at "60" and then stop it. With the chrono seconds hand out of the way, this would be easy enough to eyeball.

- While the watch is stopped, reset the chrono: now that the running seconds hand is stopped exactly at the top, I would reset the chrono so that I can use the chrono seconds hand as a guide. I would then move the big hands to 7 o'clock, and make sure that the main minute hand lume disappears perfectly behind the chrono seconds hand.

- Push the crown to restart the running seconds: as an accurate clock strikes 7:00:00, I would push the crown in to restart the watch.

I don't know if this post gets the OCD gold medal of 2022, but misalignment generally bothers me, especially with precision instruments. I am able to get the minute hand aligned properly in other positions, but it's quite hard. It seems to me that using the chrono seconds hand as a guide would make the job easier.

On another note, my watch runs a little fast, which I really like because when I need to set it (once a month or so), all I need to do is hack it and wait, then restart it, without having to move the minute hand at all. So my alignment is preserved. If it ran slow, I would need to do this alignment routine every time I set the watch.

Ok, enough splitting hairs... Merry Christmas, everyone!

Having trouble following … Post a video when you do this

[Jessiecopeland]

The very definition of Chronograph
An instrument to record passage of time.
When it is in a wristwatch, it has the added complication of having to do so without affecting time keeping of the watch.
In most wrist chronographs, the two are completely independent.

I have worked on hundreds of chronographs, and cannot think of any that would be damaged by having the crown pulled to time setting position.

[Tim Plains]

If I understand this correctly, you want to move the chrono hand away from 12 so you can align the minute hand. Why can't you just pick a different minute marker to align the minute hand?

[3omar]

Originally Posted by Tim Plains

If I understand this correctly, you want to move the chrono hand away from 12 so you can align the minute hand. Why can't you just pick a different minute marker to align the minute hand?

No, I am moving the chrono seconds hand so I can stop the running seconds hand just as it gets to the top of its subdial. The top of the running seconds subdial is hidden behind the tail of the chrono seconds hand when it's at the 12 o'clock position. That's why I need to move it.

[3omar]

Originally Posted by Jessiecopeland

The very definition of Chronograph
An instrument to record passage of time.
When it is in a wristwatch, it has the added complication of having to do so without affecting time keeping of the watch.
In most wrist chronographs, the two are completely independent.

I have worked on hundreds of chronographs, and cannot think of any that would be damaged by having the crown pulled to time setting position.

I am not talking about just pulling the crown. I am talking about pulling the crown AND THEN resetting the chrono while the crown is pulled. Do you think that's ok too?

[Jessiecopeland]

Originally Posted by 3omar

I am not talking about just pulling the crown. I am talking about pulling the crown AND THEN resetting the chrono while the crown is pulled. Do you think that's ok too?

My original answer still stands.
They are two completely different mechanisms.
Do what you want, when you want. Every Rolex is designed so that the user cannot break the movement by user error.

[77T]

Originally Posted by Shauz

Don't have a Daytona, but could you elaborate what NOT to do?

I was suggesting that one ought to refrain from resetting a running chrono. Best to halt the chrono, then reset.


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[Solo118]

Originally Posted by Jessiecopeland

My original answer still stands.
They are two completely different mechanisms.
Do what you want, when you want. Every Rolex is designed so that the user cannot break the movement by user error.

I had Daytonas for 15+ years, all I know is not to hit the reset button while running. There could be other do's and dont's but I would rather keep it safe and only do what the manual says

[Jessiecopeland]

Originally Posted by 77T

I was suggesting that one ought to refrain from resetting a running chrono. Best to halt the chrono, then reset.


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There is a safety feature bUilt into any chronograph.
You cannot reset a running chronograph unless it’s a split second chronograph.