2824-2 - Date Change 1 Hr Late

[mzinski]

I have installed and completed a custom project watch using an Asian Clone 2824-2 movement. Dial is seated, hands set, timing within +4sec a day face up - fine. On my first test, the date flips at midnight - good job, the hands have been set to align to midnight when the date changes. I give the watch a healthy hand wind and we're off to the races. Each morning, I confirm the time keeping and date. Each morning everything looks good. Until morning 8. That's when I notice the date hasn't changed but the time is correct. I decide to manually change the date by setting the hands, it's changes at 8:00a. 

Strange. I do this again. This time it changes at 9:00a. Then 10:00a. And so on. 

So, the movement is keeping good time. Which to me suggests the hands aren't dragging, right? Because the time would be one hour off. 

So I'm at a loss here. What could be the issue causing a consistently changing date flip, 1 hour later every day? 

Thank for your help! 

[ITProDad]

What a unique problem!!

allow me to venture a guess?

 

time is accurate.

minutes and hour hands are aligned and in sync.   You can set the date but it changes an hour later each day.

Im going to get some terminology wrong here, so please forgive me:

i would look at the day/date reduction wheel.  The one(s) that feed the day/date jumper.  I would guess it is either damages, or, more likely, it’s the wrong component for that movement and is slightly too small for that particular movement’s calendar works.

it the reduction wheel were the wrong diameter or had the wrong number of teeth, it would cause only the date to be affected.  Too large and I THINK the date would turn early.  Too small and an it turns late.  Or vise versa.

 

the only way you can determine this is to look up the specs of the original movement being cloned and see what size, configuration those wheels be.

 

Thats just a guess.

please post when you figure it out?  This one has me intrigued!!!

[bytes2doc]

New to watches, I would venture a guess.  Since it was behaving as expected for a full 8 days, then started to switch the date incorrectly, would imply something broke, or became misaligned, or loose at day 8. 

Obviously I haven’t a clue, but it’s fun to speculate!

would appreciate and update when you figure it out.

[Nucejoe]

I agree with itprodad, fault in date jump gear train, bad gear or pinion teeth.

 

[jdm]

8 hours ago, bytes2doc said:

 Since it was behaving as expected for a full 8 days, then started to switch the date incorrectly, would imply something broke, or became misaligned, or loose at day 8. 

That's not what the OP wrote. He only noticed the fault on the 8th day, since just then it became evident during daytime.

If the mov`t is of the same low grade as in Mark's video below I think one can expect any kind of design or manufacturing defect. 

 

[mzinski]

On 8/21/2019 at 10:14 AM, ITProDad said:

What a unique problem!!

allow me to venture a guess?

 

time is accurate.

minutes and hour hands are aligned and in sync.   You can set the date but it changes an hour later each day.

Im going to get some terminology wrong here, so please forgive me:

i would look at the day/date reduction wheel.  The one(s) that feed the day/date jumper.  I would guess it is either damages, or, more likely, it’s the wrong component for that movement and is slightly too small for that particular movement’s calendar works.

it the reduction wheel were the wrong diameter or had the wrong number of teeth, it would cause only the date to be affected.  Too large and I THINK the date would turn early.  Too small and an it turns late.  Or vise versa.

 

the only way you can determine this is to look up the specs of the original movement being cloned and see what size, configuration those wheels be.

 

Thats just a guess.

please post when you figure it out?  This one has me intrigued!!!

Thanks! I agree with your hypothesis - I'll get around to testing the theory in a few days when I've got a few new parts to interchange. 

[mzinski]

@ITProDad

Frustratingly I cannot say for certain the issue. I disassembled the watch to remove and inspect the hour wheel, intermediate date wheel, and calendar driving wheel. All appeared clean and undamaged under 10x mag. 

Reassembled the movement, installed a generic movement hour hand, and wound. Tested the date change over night and by hand setting the time. It all works fine now. 

Reassembled the watch, retested....it's all working fine. 

My guess is it was dirty or had something causing the teeth to misalign - and that was dislodged when I removed the wheels. 

Case unsatisfying-ly closed. 

[AndyHull]

Run it for another 8 days before you close the case, whatever the issue is, may return.

[nickelsilver]

Do you have a dial washer? If not that can be the cause. Sometimes even without a dial washer and there being enough space between the dial and hour wheel to allow it to disengage, the minute hand will limit the vertical movement of the hour hand/wheel. Maybe you had a situation where it was almost secure but when the hour wheel is under tension arming the date wheel it just makes it to skip a tooth.