Crystal measurement - Seiko & Citizen Watch Forum Japanese Watch Reviews, Discussion & Trading
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Old 02-15-2019, 09:22 AM   #1 (permalink)
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Default Crystal measurement

Hi

Sorry for another crystal question

I'm tidying up my late fathers Seiko chronograph - a 7t32-6a00 - purely for sentimental reasons- I appreciate these don't really have any value.

The crystal is badly scratched and chipped but when I use Jules Borel to find the crystal number to cross reference it for size or on the Cousins site etc I see the code CRY-12467 rather than the usual Seiko reference I've used for other watches.

Does anyone recognise that coding method?

I'm thinking I'll pick up a 20 quid digital micrometer and measure the one in the watch and attempt to order a generic one. I guess it will be useful in the future. Assuming I can establish the diameter and the thickness relatively easily, how do I determine the correct bevel to clear the inner edge of the rotating bezel?

Final question - honest! - there doesn't seem to be a metal ring to secure the glass like a 7548. Is it just a friction fit on these and am I likely to have trouble with my ancient crystal press I bought off eBay - the handle of which is very short (I suspect it's really for plastic crystals)

Thanks for any advice

Gavin
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Old 02-15-2019, 09:32 AM   #2 (permalink)
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Jules gave this when I looked ?

290WB2HK01
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Old 02-15-2019, 10:09 AM   #3 (permalink)
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Jules gave this when I looked ?

290WB2HK01
Oh! Thanks!

Did you use this code for the search?

SEK CS#7T32-6A00

If so what am I doing wrong I wonder?
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Old 02-15-2019, 11:29 AM   #4 (permalink)
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Oh! Thanks!

Did you use this code for the search?

SEK CS#7T32-6A00

If so what am I doing wrong I wonder?
Yes, when your on the JB site click on your number and it takes you to what watches this crystal fits.
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Old 02-15-2019, 12:25 PM   #5 (permalink)
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Yes, when your on the JB site click on your number and it takes you to what watches this crystal fits.
Right thanks - I see now. Normally i've seen the code in the Alternate # column - didn't think to click the 'Crystal' link.

Hmm, looks like I will need to order from them as Cousins don't have that crystal number in their Sternkreuz catalogue - nothing on eBay either.

At least with the correct code I know what Im looking for now though - thank you

Cheers

Gavin
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Old 02-15-2019, 12:40 PM   #6 (permalink)
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It might be a generic you get. Check prices on STSupply.com if so.
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Old 02-15-2019, 01:03 PM   #7 (permalink)
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You will find a digital vernier more useful.
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Old 02-15-2019, 01:51 PM   #8 (permalink)
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You will find a digital vernier more useful.
I always use a couple of Mitutyo (tool snobbery) when i'm measuring anything in the "workshop" but in home I use a digital vernier I bought from Aldi for about 7 and it does the job perfectly.
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Old 02-15-2019, 02:00 PM   #9 (permalink)
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Or this.

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Old 02-15-2019, 02:03 PM   #10 (permalink)
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Not much good for diameter tho!

Lovely tool mind you
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Old 02-15-2019, 02:06 PM   #11 (permalink)
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Or this.

That's a beauty.

What do you call this type of dial indicator setup?
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Old 02-15-2019, 02:06 PM   #12 (permalink)
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Nice tool Guy ( I bet you don't here that often enough ? ) but limited use.
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Old 02-15-2019, 02:08 PM   #13 (permalink)
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Quote:
Originally Posted by IMeasure View Post
That's a beauty.

What do you call this type of dial indicator setup?
We would use tools like that for batch checking a number of parts but not limited to that use.
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Old 02-15-2019, 02:30 PM   #14 (permalink)
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You would need a slip set with it which will enhance the costs.
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Old 02-15-2019, 03:09 PM   #15 (permalink)
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VKA micrometre I think. Feintaster, use it for measuring jewel dia on the little table that can be raised and lowered on the right. You set 0 by rotating the bezel of the dial readout and you can widen the measuring arms with the little arm at about 6:30 *in the pic.

What would the slip set do Don? Define the accuracy of the measurements?
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Old 02-15-2019, 03:32 PM   #16 (permalink)
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Thanks everyone.

I'll try that web site Guy and yes I think I probably meant a vernier Don. They seem reasonable but 7 sounds amazingly cheap!

It's taken me ages to rip the bezel off the thing. Kept going back to it and slipping a paring knife around it a bit more and eventually it relented with no visible damage.

Be nice to have it able to rotate again!

Cheers again

Gavin
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Old 02-15-2019, 05:13 PM   #17 (permalink)
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Slips would be used if the instrument were being used as a comparator. Say the items being measured should be 3.175mm. Build up a set of slips to this size, place them between the anvils and set the dial to 0. Then it's easy to place each part between the anvils and immediately tell how close +/- they are to the size.
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Old 02-15-2019, 07:45 PM   #18 (permalink)
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Ah got you. Clever! Cheers.
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