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Citizen/Miyota 8200 Lift Angle

Paul80

By Paul80
in Watch Repairs Help & Advice

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Paul80 WRT Addict

Paul80

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Hi all

Just finished a service on a Citizen 8200 which I understand uses a Miyota movement.

Anyone know what the correct lift angle is for this movement as it's not mentioned in any of the online lists I use.

Thanks for any help with this

Paul

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Klassiker Distinguished Member

Klassiker

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Watchguy UK gives the Miyota 8215 as 49.0 deg. and Ranfft puts the 8215 in the same family as the 8200. If you want to know for sure, you can set your movement to a known amplitude, and adjust the lift angle in your timing machine until the amplitude-reading matches. There are threads on here describing the procedure in detail.

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jdm Distinguished Member

jdm

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12 hours ago, Paul80 said:

Anyone know what the correct lift angle is for this movement as it's not mentioned in any of the online lists I use.

Even if one doesn't, the good news is that is not an important data at all. The timegrapher will show beat error, timing and patter totally unaffected. Only the amplitude will be slightly off, to a most of 4-5 deg perhaps, not enough to affect good judgment.

 

11 hours ago, Klassiker said:

If you want to know for sure, you can set your movement to a known amplitude, and adjust the lift angle in your timing machine until the amplitude-reading matches.

Good luck getting reliable results doing that. You need to use high-speed photography and overlay a goniometer to the digital image, to measure with an error around 5 degrees. A waste of time and effort in my opinion. 

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JohnR725 Distinguished Member

JohnR725

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7 hours ago, jdm said:

Good luck getting reliable results doing that. You need to use high-speed photography and overlay a goniometer to the digital image, to measure with an error around 5 degrees. A waste of time and effort in my opinion. 

I have a couple YouTube videos that make it look simpler than what you're describing. Plus we've already discussed this in the group somewhere before.

https://youtu.be/-Xgcck692js

https://youtu.be/1ozEEAkYX0M

But to some degree it's a waste of time unless you're really obsessed or you're having some sort of problem like the amplitude is low on the timing machine but visually it looks great in the watch. Or the timing machine says the amplitude is way too high and you know it's not. Or for some reason you just really obsessed with having the perfect lift angle like for a pocket watch which could be just about anything versus a wristwatch that typically fall within a relatively narrow range. Which is why the timing machine defaults to 52°.

Then I have a different reference that what's referenced above and it says 49°. 

https://calibercorner.com/miyota-caliber-8215/

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