Crystal Fitting - Seiko & Citizen Watch Forum Japanese Watch Reviews, Discussion & Trading
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Old 03-05-2019, 07:37 PM   #1 (permalink)
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Default Crystal Fitting

One of the things about some Seiko crystals is the angel around the edge. Standard mineral glass has barely any ground off, not enough for a bezel to snap into place. Seiko's have quite a large bit ground off the edge, enough so that the angle cuts down to about half the thickness of the glass. It's that little, less than a mm difference that requires an OEM crystal, or AM that is made exact. This is how I solved that problem.

You can see how much of the 'corner' is ground off on this
Seiko crystal.
20190305_165217.jpg

This is a generic 1.5mm thick mineral glass crystal
20190305_165258.jpg

Taped and trimmed the underside of the crystal, then using
contact cement, glued it to one of the dies from a caseback
press that has a bolt going through to attach to a drill
20190305_165312.jpg

20190305_165325.jpg

Mounted the drill in my bench vise
20190305_165418.jpg

Cut off disk for a dremel
20190305_165748.jpg

Holding the disk at about a 45 angle with the drill
spinning and grinding more off the edge
(Put a drop of oil on the disk)
20190305_165800.jpg

Ground down to about half the thickness of the crystal
20190305_171723.jpg

The bezel now snaps on like it should.
20190305_180225.jpg

20190305_180230.jpg
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Old 03-05-2019, 08:33 PM   #2 (permalink)
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Great job and good out-of-the-box thinking.


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Old 03-05-2019, 09:08 PM   #3 (permalink)
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Excellent work! I tried something similar (shaving off 0.1mm from a standard mineral crystal) but my cheapie hand drill gave out! I'm curious about the glue though; I used double-sided tape to fix the crystal to the die and it held reasonably well.
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Old 03-05-2019, 09:16 PM   #4 (permalink)
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Well played. Love seeing this sort of home cooked watchmaking.


Congrats!
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Old 03-05-2019, 10:00 PM   #5 (permalink)
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nice job Jerry - perfect solution. Thanks for sharing with the gang.

PS - I like the top side brushing on that case too.
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Old 03-05-2019, 10:23 PM   #6 (permalink)
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Thanks fellas, I've done this on a couple of crystals and took some pics this time.

Quote:
Originally Posted by mwadner View Post

PS - I like the top side brushing on that case too.
Thanks Mike, I did the brushing using the same method, bolted the case in between 2 dies and spun it with the drill. It does produce nice even curved lines.

20190304_222812.jpg
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Old 03-05-2019, 10:34 PM   #7 (permalink)
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we may have had this discussion before but do you think that top side brushing is "brushing" or something a little more like a light milling? I know on the case backs the concentric circles are cut pretty deep like they were lightly milled in ..... thoughts?
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Old 03-05-2019, 10:39 PM   #8 (permalink)
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Quote:
Originally Posted by mwadner View Post
we may have had this discussion before but do you think that top side brushing is "brushing" or something a little more like a light milling? I know on the case backs the concentric circles are cut pretty deep like they were lightly milled in ..... thoughts?
I think they're milled at the factory. The finish on a Pogue or a turtle definitely has distinct lines that look like a newly turned brake disk. Making a guess, I'd say it's done before the lugs and crown notch are cut.
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Last edited by zeke441; 03-05-2019 at 10:43 PM.
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Old 03-05-2019, 10:43 PM   #9 (permalink)
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Quote:
Originally Posted by zeke441 View Post
I think they're milled at the factory. The finish on a Pogue or a turtle definitely has distinct lines that look like a newly turned brake disk.
Agreed. +1
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Old 03-06-2019, 12:00 AM   #10 (permalink)
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I use my round file and file out the in / underside of the bezels if needed.



Just enough to clear the glass but of course so that it still snaps on.
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Old 03-06-2019, 12:11 AM   #11 (permalink)
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ingenuity at its best. Nice work.
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Old 03-06-2019, 03:27 AM   #12 (permalink)
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Quote:
Originally Posted by nzwatchdoctor View Post
I use my round file and file out the in / underside of the bezels if needed.



Just enough to clear the glass but of course so that it still snaps on.
What happens if a future owner replaces the crystal with a OEM crystal and you've altered the bezel ?
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Old 03-06-2019, 03:28 AM   #13 (permalink)
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Thats a good work round Jerry
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Old 03-06-2019, 06:17 AM   #14 (permalink)
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Quote:
Originally Posted by zeke441 View Post
Thanks fellas, I've done this on a couple of crystals and took some pics this time.



Thanks Mike, I did the brushing using the same method, bolted the case in between 2 dies and spun it with the drill. It does produce nice even curved lines.

Attachment 405015



Nice work Jerry!



That's a Beautiful dial! What's the model number?
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Old 03-06-2019, 09:46 AM   #15 (permalink)
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Kudos, Jerry, on a job well done! The final result came out beautifully.

PS: how did you get it off the crystal die to which it was glued? Did you mask both sides with tape, apply the glue only to the tape, then just peel off the tape?

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Old 03-06-2019, 11:11 AM   #16 (permalink)
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Quote:
Originally Posted by TheTigerUK View Post
What happens if a future owner replaces the crystal with a OEM crystal and you've altered the bezel ?
I thought the same thing. Seems a strange approach to do that but ...who am I to judge I guess.


And very good job Jerry...
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Old 03-06-2019, 01:03 PM   #17 (permalink)
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Quote:
Originally Posted by TheTigerUK View Post
What happens if a future owner replaces the crystal with a OEM crystal and you've altered the bezel ?



Nothing happens
The bezel still snaps on and it's only undercut so not noticeable from the top
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Old 03-06-2019, 02:10 PM   #18 (permalink)
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Quote:
Originally Posted by nzwatchdoctor View Post
Nothing happens
The bezel still snaps on and it's only undercut so not noticeable from the top
I would be most concerned with material removed from the bezel it's not pressing down on the gasket as hard as it should if an OEM crystal is used again.

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Old 03-06-2019, 02:12 PM   #19 (permalink)
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Quote:
Originally Posted by OutaTime View Post
Kudos, Jerry, on a job well done! The final result came out beautifully.

PS: how did you get it off the crystal die to which it was glued? Did you mask both sides with tape, apply the glue only to the tape, then just peel off the tape?
The die is cupped so only the outer edge actually has contact, and only with the tape. Using contact cement it peels off the die rather easily so the die is clean again.

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Old 03-06-2019, 02:13 PM   #20 (permalink)
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Quote:
Originally Posted by SeikoPsycho2 View Post
Nice work Jerry!



That's a Beautiful dial! What's the model number?
7009-8081

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Old 03-06-2019, 03:10 PM   #21 (permalink)
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Great job!
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Old 03-07-2019, 12:21 AM   #22 (permalink)
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[QUOTE=zeke441;2734141]I would be most concerned with material removed from the bezel it's not pressing down on the gasket as hard as it should if an OEM crystal is used again.





You can sleep easy tonight - your concern is unfounded
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Old 03-07-2019, 05:24 AM   #23 (permalink)
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Quote:
Originally Posted by nzwatchdoctor View Post
Nothing happens
The bezel still snaps on and it's only undercut so not noticeable from the top
I can't decide whether your kidding us with your repair "methods" or you really do these things
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Old 03-07-2019, 07:13 AM   #24 (permalink)
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You don't know if he's even a doctor at all!

...

I would love to refinish some crystals on my mini-lathe, but the fixation of the crystal to the spindle is what kept me from doing it. Contact cement seems a good solution, but how do you center the crystal reliably?
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Old 03-07-2019, 08:42 AM   #25 (permalink)
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Quote:
Originally Posted by Mr.Jones View Post
You don't know if he's even a doctor at all!

...

I would love to refinish some crystals on my mini-lathe, but the fixation of the crystal to the spindle is what kept me from doing it. Contact cement seems a good solution, but how do you center the crystal reliably?
How about getting some material like acetal, turn a recess in it the size of the crystal you want to polish and thats it ?
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