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Eta 2894-2

Specializedjim
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Specializedjim Member

Specializedjim

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Hi all. I have a broken subsidiary dial pivot (hope that’s the correct terminology) on a eta 2894-2. I realise the chronograph module is supposed to be non serviceable but my research shows that there is a Swatch group company that does sell spares for this module. Can anyone tell me who this is please. Many thanks.

 

 

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anilv Distinguished Member

anilv

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The module is manufactured and serviced by Dubois Depraz but I believe they only accept work from the dealers.. ie Omega or other brands that incorporate this module in their watches. Also they are not serviced per se , but replaced on an exchange basis.

Anyone else can confirm this?

Anilv

 

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HSL Distinguished Member

HSL

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Well it depends .. ETA themselves have this movement listed on their chronograph selection nowdays.
https://www.eta.ch/en/our-products/mechanical-movements/mecaline-chronographs/eta-mecaline-chronographs-2894-2
If you push the technical Communication button on the site you will find the Tech sheet for it too. 
If your movement is looking anything like the one above then getting the parts from a third part dealer I would look for them at https://www.cousinsuk.com
I attache a Picture so you can try to find the correct part.
Hope this helps you on your search..

ETA2894-2.png

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jdm Distinguished Member

jdm

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33 minutes ago, Specializedjim said:

Yes that’s my movement. But I don’t think the part I need is listed. Can anyone confirm the name of the part I need in the picture attached from the chronograph module of a eta 2894-2. Many thanks for your help.

As mentioned above the module is made by Dubois Depraz not ETA, unfortunately you will not get help from them, that's the standard Swiss business practice.

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Specializedjim Member

Specializedjim

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Many thanks for the info. I’m a bit confused as to the manufacturer as I have been told the chronograph module is actually made by eta not Depraz. Any way that doesn’t matter I would still really like to know the correct terminology for the part that’s broken. Thanks again.


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HSL Distinguished Member

HSL

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1 hour ago, Specializedjim said:

Yes that’s my movement. But I don’t think the part I need is listed. Can anyone confirm the name of the part I need in the picture attached from the chronograph module of a eta 2894-2. Many thanks for your help.

Unfortunately JDM is partly right the chronograph module has part number 8510 and is only sold as what ETA calls an "integrated part".
You have to be authorized by ETA to buy it from them but even then it comes with an hefty prize.
At Cousine you will find it as a "Restricted" part.

I think the best chance is to buy one "Second hand" but there isn´t any parts for it out there.

Used module:
https://www.hhcdsjstore.com/index.php?main_page=product_info&products_id=486718

New:
Cousineuk Chronograph Module Assembled, Height 1 ( 8510 ), ETA 2894.2 ETA289428510 (Restricted)
https://www.boley.de/caliber/watchmovements/eta/4873
http://www.startimesupply.com/merchant2/merchant.mvc?Screen=PROD&Store_Code=1&Category_Code=1H-Parts-Movt-IntParts-ETA-07&Product_Code=ETA2894-8510-H1

And a tech sheet with the correct partnumbers for everything except the chronograph module.
 

2894-2_Tech_Com.pdf

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Specializedjim Member

Specializedjim

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Thanks everyone for the great input.

I have now been able to disassemble the Chrono module, remove the broken item and after about twenty attempts learning a little more every time, put the module back together and it works!!

So if I can’t get a new part the next question is, is there a standard repair procedure for repairing a broken shaft/spindle in a part like this (please see picture). I am a experienced engineer and have access to all types of machine tools thanks to my job. But before I start trying to reinvent the wheel I wondered if there is a proven method.

Thanks again for all the help.

0f16c1a9ec10c2aee81fe2a386d6351e.jpg





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jdm Distinguished Member

jdm

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If I understand right it's a snapped pivot, an experienced watchmaker would cut a new one on a watch maker's lathe and install it with a staking tool.

A general machine shop wouldn't be able to make a part that small. 

FYI it's normal with the Swiss watch industry that one can't easily understand who does what. It's a thick web of contract work, patents and agreements made to their exclusive benefit. It has been like that since more than 200 years. 

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anilv Distinguished Member

anilv

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With these DD modules you need to dismantle with the chrono in the 'running' position to avoid parts flying off.

But you've probably figured that out already! I serviced mine when I had one .. more to see how it was constructed but after getting it back together I swore I'd never service (or buy) another.

Anilv

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Specializedjim Member

Specializedjim

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If I understand right it's a snapped pivot, an experienced watchmaker would cut a new one on a watch maker's lathe and install it with a staking tool.
A general machine shop wouldn't be able to make a part that small. 
FYI it's normal with the Swiss watch industry that one can't easily understand who does what. It's a thick web of contract work, patents and agreements made to their exclusive benefit. It has been like that since more than 200 years. 


Many thanks that’s what I thought would be the method.

I work for a very large Japanese cutting tool manufacturer and we produce tools down to 0.1mm. Because of this I also have customers who have equipment to work this small so the size of the repair isn’t an issue. I may even manufacture a new part complete if I can’t simply purchase a new one.

Again many thanks again for the information.


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jdm Distinguished Member

jdm

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2 minutes ago, Specializedjim said:

I work for a very large Japanese cutting tool manufacturer and we produce tools down to 0.1mm. Because of this I also have customers who have equipment to work this small so the size of the repair isn’t an issue. I may even manufacture a new part complete if I can’t simply purchase a new one.

 

You also have to measure the jewel hole to a precision of at least 0.01mm for the new pivot. It could also be made as an extension fitted on the existing body.

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