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ITProDad

Seiko 7s26c

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4 hours ago, ITProDad said:

 

Took a while, and several partial assemblies and disassembles. But it’s finally done. And running surprisingly well for my first wrist watch.fae47cba67c859f9e48edddb0053f441.jpgc76b044cf85f9daa8a738511f3742aea.jpg3fff093dc42548e789530efb5a1e40f9.jpg

 

 

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:Bravo:    Looks stripped down enough to have recieved a good bath, did you brush clean too?   Cute watch too. 

 

 

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14 minutes ago, aac58 said:

I've never seen such an amplitude on a Seiko movement, are you sure you had the correct 52º lift angle on your timegrapher?

It's very good value, likely taken a full wind, but not exceptional

Note that 7S, 4R and 6R all have 53° lift angle, check attached. 52° is the machine's default, and produces a very close amplitude value anyway. 

 7S26C.pdf7S26C.pdf

Edited by jdm

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4 minutes ago, jdm said:

Note that 7S, 4R and 6R all have 53° lift angle, check attached. 52° is the machine's default, and produces a very close amplitude value anyway. 

I'm checking your attachement, doesn't it say 52º?

Edited by aac58

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56 minutes ago, aac58 said:

Very good job! I've never seen such an amplitude on a Seiko movement, are you sure you had the correct 52º lift angle on your timegrapher?

As I said, that's a very good job. Honestly I've seen (and got) amplitudes above 300º but in older manual Seiko movements as 66.

9 minutes ago, clockboy said:

Adjusting the lift angle on a Timographer only makes a marginal reading difference IMO

So, why do we care about it? And why I was corrected only a few minutes since I said it should be 52º and not, for example, 54,5º as in 6119 or 6309, which is a considerable difference?

Edited by aac58

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59 minutes ago, aac58 said:

I'm checking your attachement, doesn't it say 52º?

Yes it does and I believe by good chance I posted the oddball tech sheet which has a wrong value. Attached three different version which say 53º. But as mentioned, it's not a big deal of difference at all.

 917_Seiko7S26A,7S36A.pdf

NH25.pdf

7S26B_36B.pdf

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:Bravo:    Looks stripped down enough to have recieved a good bath, did you brush clean too?   Cute watch too. 
 
 

Not sure what “brush clean” means. I use an ultrasonic with L&R cleaner and rinse solutions. Then is peg wood to get the remainder. I had to order a couple extra balance completes as it did not come with a working balance and I ruined the first one with a slip of my tweezers. At $4 each, I ordered 5. Went through 2 before I got it right.


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Very good job! I've never seen such an amplitude on a Seiko movement, are you sure you had the correct 52º lift angle on your timegrapher?

Yes. It was set to 52 degrees. But that amplitude was only a in one position. The rest ranged from 240 to 260. Enough to be satisfied for my first wrist watch.


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2 minutes ago, ITProDad said:

 I had to order a couple extra balance completes as it did not come with a working balance and I ruined the first one with a slip of my tweezers. At $4 each, I ordered 5. Went through 2 before I got it right.

These were the Chinese ones. Very good result then, another member reported that the one he got had a bent pivot.

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2 minutes ago, ITProDad said:


Yes. It was set to 52 degrees. But that amplitude was only a in one position. The rest ranged from 240 to 260. Enough to be satisfied for my first wrist watch.


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These are outstanding results, congrats.

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These were the Chinese ones. Very good result then, another member reported that the one he got had a bent pivot.

I ordered from the Seiko part site from Japan. Maybe I’m wrong on the price. But not by much. Oh well, it worked. I’ll look more closely next time I order a new part.


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Please post link?

I can’t find the original site. I’ve purged my browser history for government spying reasons....

However, here is a pic of one of the “extras” I purchased. I believe you are correct about it being Chinese. Though I do remember the ship-from address to be Japan.26b9433a932beeda728610c6e3b59584.jpg


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47 minutes ago, ITProDad said:

However, here is a pic of one of the “extras” I purchased. I believe you are correct about it being Chinese. Though I do remember the ship-from address to be Japan.

Yes, also because the writing is in Chinesem and a genuine Seiko balance packaging is quite different.
Nothing strange that it comes from Japan, they trade with China just like we do and probably since a longer time :biggrin:

Edited by jdm

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