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About the Quartz watch Second hand alignment

About the Quartz watch Second hand alignment

 About the Quartz watch Second hand alignment

There are times when the second hand doesn’t quite hit the marker.second hand mis-alignment

I have received many questions regarding this from several customers asking why this was happening. I found an easy-to-understand explanation on the Citizen watch site, so I am posting a summary of it. 

The second hand’s movement is controlled by the gears. There is an intentional space placed in-between each gear.  That space(playfully) is called "backlash". This backlash is the cause of the second hand mis-alignment The gear space causes the place where the second hand stops to slip a little.

 An adequate backlash is essential for smooth gear operation. To put it quite simply, the gears would stop turning if the backlash was too small.

The reasons for the necessity of an adequate backlash are outlined below. 

1.Thermal expansion
The gears expand due to the heat from friction. A difference of just 10C can have an affect on gear alignment, even if they are small. The backlash is essential in minimizing that affect. 

2.  Distortion
The gears of a watch take on pressure as they mov, causing these small parts to become slightly distorted. The backlash is necessary to minimize distortion.

 3. Impact
Watches are sometimes dropped. The will cause the gears to break upon direct impact if there isn’t a bit of slack. 

 4. Wear resistance
By creating a backlash, it is easier for lubricant to get up into the gearspreventing abrasion. 

5.Parts Standardization
The parts in a watch are not all exactly the same size, strictly due to error, despite an increase in machining accuracy.(Of course this is within the acceptable range for the maker).In order to account for this error, it is important to put the backlash into place to ensure that all parts turn smoothly..
This might be the main reason.

In conclusion

The Backlash is an essential part of the gear, and can’t be removed 100%.

While it is possible to reduce the backlash by improving the gear manufacturing precision and assembly method, doing so would have an impact on thermal expansion, impact, and wear resistance etc.

In other words, an adequate backlash is the solution for balancing durability, accuracy, and refined hand movement within the watch.

That is all of the available information from the Citizen watch site.

References:
Citizen watch site (Japanses)
https://citizen.jp/support/useful/lag01.html
Picture : Wikipedia
https://en.wikipedia.org/wiki/Backlash_(engineering)


The rest is what I have been able to determine speaking from personal experience.

SEIKO has come out with Backlash auto-adjust mechanism, which they use in the Grand Seiko Quartz for reducing second hand mis-alignment.

The Grand Seiko Quartz uses the power of the spring to reduce the slight second hand  mis-alignment that is created by the backlash as much as possible. (It’s like stopping the motion of a moving object with the power of a spring, which is difficult to wrap my head around.)

Even though the misalignment is far less noticeable in Grand Seiko is n comparison to any other watch, even the meticulously crafted Grand Seiko suffers from a slight second hand mis-alignment. (Sorry SEIKO)

About SEIKO Backlash auto-adjust mechanism,
https://www.grand-seiko.com/au-en/special/9f9s9stories/vol3/2/

Seiya Kobayashi

The Alpinist will make a comeback in Jan 2020.

The Alpinist will make a comeback in Jan 2020.

  1. It has been newly fitted with 6R35 movement. The power reserve has been upgraded to 70hr. *(The 6R15 movement had a 50hr power reserve.)
  2. It will keep the 20 ATM water resistance but will come with a see-through back.
  3. The green dial will remain pretty much the same. It was announced that a black and white contrasting dial will be offered as well.

There aren’t any available photos, and details are subject to change.
But I still can’t wait for it to come out.

SBDC091
 Green dial + Brown leather strap  -- 75000 Yen

ALPINIST SBDC091

SBDC089
 White dial + Black leather strap  -- 75000 Yen

SBDC087
 Black dial + SS bracelet   -- 77000 Yen

ALPINIST SBDC087 SBDC089

SeiyaJapan.com

Sayonara Grand Seiko SBGX205, SBGX209

Sayonara Grand Seiko SBGX205, SBGX209

 

Seiko has announced that they have stopped selling the SBGX205, (as well as the SBGX209).
 
The SBGX005 sold since 1997 underwent a minor change and was sold as the SBGX205 for 22 years.

 

Since it was a long seller, and was relatively affordable, it was a best seller.
 

Grand Seiko was only sold within Japan when it went on sale. So this watch was made for Japanese people.

The 36.5mm size was perfect for Japanese people.
   

The curved case differs from the typical flat and straight lines of the recent Grand Seiko.This design was also in style at the time. 

Only the case design was different l, and was polished with SALLAZ polishing.
It uses all of the best technology of Grand Seiko.
 
 
In order for the band to always keep a nice feel, there is a little bit of play between each link.
  
The dial has a special finish. (It is difficult to explain in words). This makes the contrast of the hands really stand out, making them really easy to see.
  
Now, even when I wear this watch, there probably wouldn’t be very many people who would recognize it as a Grand Seiko. It might not suit a younger crowd.

 

However, I think it fits 50+ year old men just fine. So I would like to buy one and keep it a secret from my wife.
Sayonara, Grand Seiko that doesn’t look like a Grand Seiko.

 

---
References: Grand Seiko Magazine GS9 (No5 September, 2016)

Sayonara SEIKO SUMO Diver.

Sayonara SEIKO SUMO Diver.

Seiko is to stop production of the SDC031 and SBDC033 wristwatches,
which carry the nickname of “Sumo Diver”.
Ever since these automatic divers watches debuted in the spring of 2007,
they have been a big hit.

 

Not only are they authentic automatic divers watches,
but they are also inexpensive,
which is why I think they were popular.

 

I wonder who gave them the SUMO nickname?
It makes sense now. It is a fitting nickname.

 

Maybe it’s because the case shape resembles a sumo wrestler.

 

I think that the case design also resembles the wrestling ring. 
 

 

I have a Blue Sumo SBDC003. I mainly wear it off.

 

It is rather heavy, which makes it feel like I am wearing a wristwatch,
and it is like a completely different watch when it is on. 
I love the curved case side.

 

I wear it a lot in the summer. I don’t dive myself,
but this watch looks great with casual clothes such as T-shirts. 

 

Come to think of it, the popular SARY055 and SARY057 have also been discontinued. 
I recommended this to those who wanted to dabble in a basic automatic.

 

I can’t wait to see what comes out next.

 

SeiyaJapan.com