This might fit better in the Watchmaking Zone, but I have a feeling that that forum is idling and I need feedback.
Since I discovered this forum or maybe just two days after I wanted to make one myself.
I have found here so many enthusiasts and so much knowledge that I'm pretty sure that there is no way to fail. Just a matter of putting in practice + a small contribution from myself (I really mean it)
The greatest problem is watch related too ...time...
The guiding lines for my design (already working on it) are as follows:
4. 100 bar +
5. 316L, CNC
6. DLC, or laser carbide coating*, or Kolsterising process**.
7. Screwdown crown ***
8. Soft iron cage
9. Secured bezel (unidirectional is ok still not perfect)
10. Seals - viton (Dupont) or something else if I'll find a better helium barrier
11. HRV (in relation to (10); working on my own design, based on seals used in heavy hydraulics, let's see if it works)
*,** both are available 250 km from my hometown
*** there MUST be a more practical alternative but "When in Rome..."
1. 2834-2 or..
2. SW200 or..
3. Hattori 5M62/3 or..
4 automatic anyway (sine qua non condition; ok with a "combo" but NO batteries)
5. no chronograph
6. this position is reserved for your suggestions
1. Sapphire or..
2. Sapphire + plastic "sandwich" *
* seems that sapphire is the most popular by now, but I would rather use a combination - scratch resistant as sapphire and impact resistant as some plastics;
even if the sapphire layer cracks the need is for another crystal and not for another watch.
1. another "sandwich" here, soft iron + brass*; simple and easy to read; not decided about the color yet.
2. Superluminova or strontium aluminate + clear epoxy/acryl (have to do some tests first)
3. I'm not very happy with the date window, but I don't think that I want to modify the movement.
* top layer, more "machining friendly", no other reason for using brass.
(E) Mechanical complications
1. Mechanical pressure gauge (it increases case height by at least 2 mm, this is much for an already "(A)1,2,3" watch)
2. No more ideas yet and I think that even (1) is useless but I really want it, just for fun.
My concerns are related to:
(A) 1,2,3 - you know what I mean, maybe 1,2 is enough
(A) 4 - why do I need a 100 bar + water resistant desk diver ?
(B) - Most people prefer swiss, there must be a serious reason.
(C) - thermal expansion coefficient is a problem if very different, deformation under pressure is another one; some FEA will tell.
(E) 1 - do I need to complicate my life with that ?
Decisions, decisions... you already understood that your opinion is welcome and considered as a great help.
I would be very happy to answer to questions (if any), or to detail anything above.
Appologies for the telegraphic presentation, I'm an engineer and I can't write beautiful stories, besides that my first language is (obviously) not english.
Thank you all for what I have learned here in the last few months and for your time spent reading this.
P.S. Don't tell me I'm crazy, I already know that and my wife would (happily) agree.