Jump to content

Change case seiko

RELORT
 Share

Recommended Posts

tIB WRT Addict

tIB

Posted
Posted

So because that Seiko is 3.8 rather than 4, if the movement fits the aftermarket case you would just need to refit the dial somehow - the day/date should line up with a 3o'clock crown. 

  • Like 1
Link to comment
Share on other sites
RichardHarris123 Distinguished Member

RichardHarris123

Posted
Posted
24 minutes ago, tIB said:

So because that Seiko is 3.8 rather than 4, if the movement fits the aftermarket case you would just need to refit the dial somehow - the day/date should line up with a 3o'clock crown. 

I don't understand how the date would line up  

Link to comment
Share on other sites
AndyGSi Distinguished Member

AndyGSi

Posted
Posted (edited)

My suggestion would be to sell it and buy another rather than ruin a perfectly good watch.

38 minutes ago, RichardHarris123 said:

I don't understand how the date would line up  

The spacing on the day/date discs means if you removed the dial the day and date would be inline with the crown.

Edit

The above depends on the movement.

Edited by AndyGSi
Link to comment
Share on other sites
Neverenoughwatches Distinguished Member

Neverenoughwatches

Posted
Posted (edited)
2 hours ago, RichardHarris123 said:

Of course, silly question when I think about it.  

You forgot one of the forum's golden rules, " no question is silly " . 🤔 A matter of repositioning dial feet.....I'd rather not. 

The day date disk stepping may not then line up with the date window of the new case. I wouldn't mess, like Richard said you might ruin a perfectly good watch. 

Lets look at an example of the alignments. The crown positions of the two cases are 3.8 ( old case ) and 3 ( new case ) , that's 15 degrees of case position difference.  In order for the date window to line back up at 3 the dial needs to be re-positioned on the movement 15° clockwise, thats the first obstacle.  Now looking at just the date disk alone, it's divided into 31 days , each date number and disk tooth is approximately 11.6 ° of rotation from it's neighbouring number. So each date position is also approx. 11.6° apart, since the new dial position is 15 ° from its original position and the date mech is set to that position..... the jumper can't be repositioned ! ... the date numbering will be approx 3.4° out of alignment with the date window.

Edited by Neverenoughwatches
  • Like 2
Link to comment
Share on other sites
tIB WRT Addict

tIB

Posted
Posted
5 hours ago, RichardHarris123 said:

I don't understand how the date would line up  

I think you've figured it and the above post explains far better than I will, but crown either side of 4 works (3.8/4.2), but bang on 4 needs a new day and date wheel.

Day wheel can be realigned on some, date is a different disc.

  • Like 1
Link to comment
Share on other sites
Neverenoughwatches Distinguished Member

Neverenoughwatches

Posted
Posted
1 hour ago, AndyGSi said:

3.8 is 24 degrees so result would be 2 degrees out.

Well spotted Andy,  I missed out the 360° of a full dial divided the 4 minutes of an hour dial reposition.   Should have actually been . 360° ÷ ( 60÷4 )= 24° . I must do better maths 😄.  Still won't line up,  11.6°  or multiples of would have.

 

1 hour ago, AndyGSi said:

3.8 is 24 degrees so result would be 2 degrees out.

 

Link to comment
Share on other sites
AndyGSi Distinguished Member

AndyGSi

Posted
Posted (edited)
38 minutes ago, Neverenoughwatches said:

Well spotted Andy,  I missed out the 360° of a full dial divided the 4 minutes of an hour dial reposition.   Should have actually been . 360° ÷ ( 60÷4 )= 24° . I must do better maths 😄.  Still won't line up,  11.6°  or multiples of would have.

It does line up which makes me believe it's not actually @3.8, even the Seiko literature states @4.

image.png.6521f396fc34f553f9282b4562937c91.png

Edit

Just realised my maths was wrong too and it would be 0.8 Degree out 🙈

Edited by AndyGSi
Link to comment
Share on other sites
Neverenoughwatches Distinguished Member

Neverenoughwatches

Posted
Posted

That's probably why they line up then. Each day on a date ring is spaced at 360° ÷ 31 days, which works out to 11.613 ° or as near as,  2 days is 23.226° . Thats probably where the crown is postioned  from 3 onwards on the original case.

Positioned at 4 would be 360° ÷ (60 ÷5) = 30°

Who has a seiko 5 and a protractor handy ?  😄

It looks like the crown is at 19 minutes, which I assume is where the 3.8 comes from .

Screenshot_20250409-200039_Samsung Internet.jpg

Link to comment
Share on other sites
AndyGSi Distinguished Member

AndyGSi

Posted
Posted
38 minutes ago, Neverenoughwatches said:

It looks like the crown is at 19 minutes, which I assume is where the 3.8 comes from .

Yes and very difficult to tell even close up if the 19 minute / 3.8 is accurate.

If you worked on a 30mm diameter dial you're looking at around 94mm circumference so 0.8 degree works out about 0.2mm

IMG_20250409_203328.jpg

Link to comment
Share on other sites
Neverenoughwatches Distinguished Member

Neverenoughwatches

Posted
Posted
4 minutes ago, AndyGSi said:

Yes and very difficult to tell even close up if the 19 minute / 3.8 is accurate.

If you worked on a 30mm diameter dial you're looking at around 94mm circumference so 0.8 degree works out about 0.2mm

IMG_20250409_203328.jpg

That's pretty damn close, the original case crown position could easily be just 2 date clicks away from 3 o'clock.  The OP still needs to decide if he wants to move the dial feet. Do seikos have dial feet ?.... I have no idea 😄.........whats a Seiko anyway 😅.   The 4 crown position doesn't leave a crown imprint  in your wrist when doing push-ups......stick with the original case OP.

Link to comment
Share on other sites
tomh207 Distinguished Member

tomh207

Posted
Posted
Just now, AndyGSi said:

Was just using 30mm as an example to show how small 0.8 degree would be on the circumference.

No worries Andy, I was just trying to be helpful as you and Rich were nearly getting to minutes and seconds, maybe radians weren’t granular enough 🤣

 

Tom

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Guest
Reply to this topic...

×   Pasted as rich text.   Restore formatting

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

×
 Share
Go to topic listing


  • Recently Browsing

    • No registered users viewing this page.

  • Topics

  • Posts

    • ChrisInOz
      No images showing

      By ChrisInOz · Posted

      The post below contains the link. If you don't already have a discord account it will take you to the registration screen.  Registration is free.   https://www.watchrepairtalk.com/topic/31653-mark/?do=findComment&comment=279066
    • luiazazrambo
      WWW Eterna sucked me in.

      By luiazazrambo · Posted

      HWGIKE#57 Valex FEF 190 15 jewels Swiss lever full service and repair This one was waiting for a balance staff replacement in my cabinet parts and case cleaned up with a new balance staff and a 4th wheel as the original 4th wheel had a broken pivot for the off center second hand. I never attempted a balance staff replacement before however I received a Bergeon Molfres (i was hunting it for about 2 years) and with the help of it I managed to remove the old staff and riveted the new one in. It also received a new MS, crystal and the hole for the MS arbor was also tightened. With the new MS now it has an acceptable performance meaning that the amplitude goes up to 280 fully wound, has an acceptable beat error and I have the two nice lines but only dial up, dial down is not as nice and I could not figure out as why. I have the two lines but the amplitude is dropping to around 230 and the lines are a bit hairy. Both dial up and dial down the lines just go up and down without seemingly any pattern. I cleaned the movement two times, and then a 3rd time pegged out the main plate and train bridge holes but made no change. Both the HS collet and the roller table was too lose on the new staff... I did not count how many times I took the balance cock off to sort out the HS collet, the roller table and the beat error, somebody before me also shortened the HS by pushing it out a bit and it seems every time somebody is messing with the end of the HS the protruding bit is most of the time twisted bent etc. This one was probably one of the most challenging repair and service. I might take the new MS out and clean it lubricate it as I just pushed the new one in to the barrel from the retaining ring. Plus started to re-read the theory of the escapement and how to analyse the graph on the timing machine: Greiner Chronografic Record manual. I am also thinking to put the watch on a 24 hour long run with the eTimer SW it once helped me to figure out what was wrong with a watch. There is an interesting part of the Greiner record manual talking about the pallets and the end shake of the balance and pallet staff. Maybe this is my issue? Who could that possibly identify? After a few years now I am still without a clue how could watchmakers make parts I can only see with my microscope or how could/can they carry out complicated services impossible to do.. real magic..... .... ..... before I sent this post while the pics were uploading I had an idea, i was browsing the possible outcomes on the timing machine I had one for magnetism..... so I demagnetized the movement and it is not hairy now.... two really nice lines 0.2 ms beat error still a bit wavy, but a lot lot better..... argh....  
    • Nucejoe
      Hello from Cypress, CA

      By Nucejoe · Posted

      Hi there, welcome here.  
    • JohnR725
      No images showing

      By JohnR725 · Posted

      yes the advertising revenue should generate money. The question is how much money? Then as far as the cost of the website goes that's relatively easy to determine? all you would have to do to grasp costs and profitability would be to go to the link below and you can actually get a website for free try it out for free I believe you get no advertising initially. They also talk about that they'll help you out they have marketing tools and some sort of paid subscription or something. So I guess were shopping for a whatever just ask them what would a maybe could use this one as an example in other words it's going to look basically identical to this is going to have advertising a paid subscriptions what's it going to cost? After all they want to sell or give us a message board like this they should bill answer the questions as they're the people who did the software for this. Yes they really said you can have a free discussion group at least to start. https://invisioncommunity.com/ I was curious about the monthly supporter thing where exactly do we find that on this message board? A quick search I'm not finding it so obviously I'm not looking in the right place?
    • Curare
      No images showing

      By Curare · Posted

      Help me out here, but with all the advertising on this site (which I don't mind) wouldn't it pay for itself or even make money for the owner ???
×
×
  • Create New...