Omega 9300 / 9900 watch movement construction

[ifibrin]

I’ve tried looking online for some discussion on the omega 9300 / 9900 watch movement construction, but I haven’t been able to find much information on it. Seeing as how some of you here are professional watchmakers @JohnR725 I was wondering if some light could be shed on this.

Would you consider the omega 9300 / 9900 construction to be closer to a modular construction with a chronograph module underneath a time only base (an omega 8500 derivative with higher beat rate), like a 2892 with chronograph module. The difference is that in the 2892 chronograph the chronograph module is on top of the 2892, while in the 9300/9900 the chronograph plate is below.

Or is my understanding of the 9300/9900 mistaken?

 

[JohnR725]

4 hours ago, ifibrin said:

@JohnR725 I was wondering if some light could be shed on this.

it would be really nice if the message board would notify somebody if they're being quoted in a message as it was a miracle I found this at all?

typically when I come to the message board I will occasionally notice the new messages on the right-hand side but usually I go right to watch repair and look for questions without answers. Or questions that have a limited quantity of answers because I assume everything that has lots of answers probably has an answer.

But occasional will see something on the right-hand side that looks interesting that all look at it. strangely enough somebody else did this a couple weeks ago and I noticed it and I have their answer like I might have found an answer for you perhaps.

4 hours ago, ifibrin said:

professional watchmakers

did you know professional watchmakers can specialize? like for instance my specialty where I work is a vintage. Vintage is sometimes misleading typically it means pocket watches. But it could also mean tuning fork watches and occasionally quartz watch if they have to have it serviced and we can't swap the movement. Then Mather specialty is absorbing a heck of a lot of knowledge which comes in handy for answering questions.

Fortunately for us you're asking about an older watch. If it was a new watch it would be problematic to get anything at all. Swatch group is paranoid with technical documentation and to get it you have to access it by username and password specifically would have to have access to an account. Then in the accounts come in various levels which determine how much technical documentation you can even access. Then if you managed to get this documentation their paranoid and they watermark every single page. So if you're lucky enough to find somebody that has such an account they're not going to share that information very far and risk finding out why Swatch group is paranoid and watermarks every single page. Fortunately as I said this is older watch they but we can find the documentation's somewhere else?

the first link for anyone who doesn't know what the movement looks like

the second link is cousins I would be searched for one of your movements and there is a PDF you can download. I'm not going to attach it to the message board because PDFs take up a lot of space on the message board. Then while you're here search for the other Omega movement you asked about because are both there. A little light reading and 42 pages there longer than what I normally see.

4 hours ago, ifibrin said:

modular construction

I suppose it depends upon what you mean by modular? If I think of modular chronograph movement I think of something like the third link. n other words a company that makes modular chronograph movements independent of the watch company and then there brought together. I've seen a technical sheets for the chronograph movement I just can't remember what number it's under to find it.

Then the Omega movements are interesting as well as I would call them more of layered construction. typically when you look at older designs of chronographs you have a watch that can function 100% by itself. Then the chronograph is built on the back side of the watch. Occasionally it will have components going through the front side for extra functions or something. But here you'll notice they don't even put the balance wheel in until everything else is been assembled. It doesn't look like he can get the watch movement to run without putting in all the layers the chronograph.

 

https://watchbase.com/omega/caliber/9900

https://www.cousinsuk.com/document/search?SearchString=9900

https://journal.hautehorlogerie.org/en/the-dubois-depraz-chronograph-module-switzerlands-best-kept-secret/

 

 

 

[watchweasol]

Hi The tech sheets for your interest. Along with JohnR725s information should give you the answers.

8597_Omega 9300, 9301, 9900, 9901.pdf

[ifibrin]

That is really cool! Thanks @JohnR725 and @watchweasol. Those movements are marvels of modern watch engineering!

[ifibrin]

After looking through the technical documentation for the 8500 and 9300, I have come to the conclusion that while the 9300 is not a modular chronograph, it is certainly an integrated chronograph with a sandwiched (layer construction), sharing a strong connection with its 8500 brother.

If you compare the layout of the 8500 and the 9300, you will find some remarkable similarities, as well as some interesting differences. The wheel train of the 8500 is shown below, with a very traditional direct seconds construction, of the sort seen in an ETA 2824. The seconds hand wheel (fourth wheel) can be seen directly in the middle of the 8500.

In the 9300, on the other hand, the wheel train lay out is very similar, although different bridges are used to secure each of the wheels. The intermediate wheel (off -center wheel) is labeled with a red arrow:

The intermediate escape wheel in the 9300 is labeled with a green arrow, the third wheel(s) is labeled with an orange arrow; interestingly, the small seconds in the 9300 is achieved via an indirect seconds pinion (blue arrow):

from my understanding, the seconds pinion appears to go through the hollow intermediate wheel.

The wheel train bridge is then fitted over:

The fourth wheel is actually achieved via the the vertical clutch mechanism, which is the central chronograph second hand:

Notice the pinion on the vertical clutch that interfaces with the third wheel via a cut-out on the bridge, and the pinion on the intermediate escape wheel that interfaces with the wheel of the vertical clutch.

The rest of the chronograph train is then fitted on top of the train wheel bridge and the barrel bridge:

Finally, the assembled chronograph bridge/platform with all the hammers and springs is assembled over the chronograph train:

Finally, the dial side motion work (train) is achieved from the third wheel, similar to the 2824:

Hopefully others who are similarly interested in modern watch movements will find this helpful, as I have no found any other discussion on the 9300 online.

 

 

Edited October 12, 2021 by ifibrin

[haoren]

On 2021/10/12 at PM7点30分, ifibrin said:

Hello, I am from China, I am repairing an Omega 9300, I need this document very much, can you send it to my mailbox, *****@*****.tld

 

 

 

[JohnR725]

21 hours ago, haoren said:

I am repairing an Omega 9300, I need this document very much, can you send it to my mailbox, *****@*****.tld

If you go much farther up page you're looking for the post made by watchweasol You'll find the PDF you seek their.