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STDevil · 26 December 2011, 06:51 PM

I am sitting here with nothing better to do and I started wondering how the crystal stays on our watches (or, in my case, my Sub C). I looked at a crystal from my dad's DJ (1963 vintage), and it looks like the crystal just gets pressed onto a raised section on the case. I do not know how the sapphire crystal stays on...it seems to be that you'd want to sandwich the crystal between the case and some sort of ring that screws down over the crystal...

I have done some googling and youtubing in my attempt to find an answer, but to no avail.

If anyone can tell me how the sapphire crystal stays in the Sub-C, it would be most appreciated. Any photos would be a real plus!

Thanks everyone,

MonBK · 26 December 2011, 07:05 PM

Like this.

STDevil · 26 December 2011, 07:08 PM

Hmmm...so it looks like the crystal is "friction fit"...

Thanks!

roger0770 · 27 December 2011, 01:19 AM

Friction fit is correct. If you go to a watchmaker, he/she can explain the details how it works. It's amazing how simple these designs are at times, but they WORK.

kilyung · 27 December 2011, 01:25 AM

Friction it is and when under water pressure plays a part.

Route 66 · 27 December 2011, 01:27 AM

Quote:

Originally Posted by MonBK

Like this.

Judging by the illustration, it looks as if there are not just one, but three rings between the crystal and the case. Does anyone know what purpose they serve?

mrbill2mrbill2 · 27 December 2011, 03:21 AM

Friction only. Under water the water pressure push down on the crystal. In saturation diving helium atoms, the second smallest atom, enter the watch case under high pressure - hence the helium escape valve on the SD and the DSSD - to keep the crystal from popping off or shattering during depressurization.

bondtoys · 27 December 2011, 03:36 AM

The 3 rings are the plastic (teflon??) gasket which keeps the distance between the crystal and the dial and the other 2 rings are fixation rings to ensure, that the crystal does not simply fall off. The second fixation ring may also fix the bezel

26 December 2011, 06:51 PM	#1
STDevil "TRF" Member Join Date: Apr 2011 Location: Seattle Posts: 82	How does the crystal stay on? I am sitting here with nothing better to do and I started wondering how the crystal stays on our watches (or, in my case, my Sub C). I looked at a crystal from my dad's DJ (1963 vintage), and it looks like the crystal just gets pressed onto a raised section on the case. I do not know how the sapphire crystal stays on...it seems to be that you'd want to sandwich the crystal between the case and some sort of ring that screws down over the crystal... I have done some googling and youtubing in my attempt to find an answer, but to no avail. If anyone can tell me how the sapphire crystal stays in the Sub-C, it would be most appreciated. Any photos would be a real plus! Thanks everyone,

26 December 2011, 07:05 PM	#2
MonBK Banned Join Date: Nov 2010 Location: Kingstown Posts: 58,279	Like this. Attached Images

27 December 2011, 03:21 AM	#7
mrbill2mrbill2 "TRF" Member Join Date: Nov 2010 Real Name: Mr. Bill Location: South Florida Watch: 16610 Posts: 6,148	Friction only. Under water the water pressure push down on the crystal. In saturation diving helium atoms, the second smallest atom, enter the watch case under high pressure - hence the helium escape valve on the SD and the DSSD - to keep the crystal from popping off or shattering during depressurization. __________________ Card Carrying Member of the Global Association of the Retro-Grouch-Curmudgeons - ID # 13

26 December 2011, 07:08 PM	#3
STDevil "TRF" Member Join Date: Apr 2011 Location: Seattle Posts: 82	Hmmm...so it looks like the crystal is "friction fit"... Thanks!

27 December 2011, 01:19 AM	#4
roger0770 Banned Join Date: Nov 2009 Location: On Earth Watch: A Few Posts: 1,510	Friction fit is correct. If you go to a watchmaker, he/she can explain the details how it works. It's amazing how simple these designs are at times, but they WORK.

27 December 2011, 01:25 AM	#5
kilyung 2024 SubLV41 Pledge Member Join Date: Jul 2009 Location: Cave Watch: Sundial Posts: 33,940	Friction it is and when under water pressure plays a part.

27 December 2011, 03:36 AM	#8
bondtoys "TRF" Member Join Date: Mar 2009 Location: World Watch: 16750 Posts: 2,733	The 3 rings are the plastic (teflon??) gasket which keeps the distance between the crystal and the dial and the other 2 rings are fixation rings to ensure, that the crystal does not simply fall off. The second fixation ring may also fix the bezel

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