Kinematic Viscosity cSt@20C - Seiko & Citizen Watch Forum Japanese Watch Reviews, Discussion & Trading
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Old 03-16-2019, 10:47 AM   #1 (permalink)
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Can someone please explain to me the concept of Kinematic Viscosity in watch lubricants. Am I correct in saying you want a lower cSt number for higher velocity faster moving parts in the movement and a higher cSt number for slower moving parts and metal to metal parts contact in a movement. Thanks for the insight.
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Old 03-16-2019, 08:57 PM   #2 (permalink)
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Oil question. Getting the popcorn out.



In car terms, the engine turns fast 10W-30, the transmission slower 75W-90W, rear end even slower 90W-140. Mobile One of course.
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Old 03-17-2019, 05:24 AM   #3 (permalink)
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I am not very experieranced in this field and only work on my own watches but I'll answer your question to the best of my knowledge.

I don't know what kinematic viscosity means but, I do know what viscosity means - the ability to flow. To me that means the easier the lubricant flows the less force is required to make the piece move. Therefore less resistance easier flow.

So generally speaking yes you are correct, those parts that move fast/faster with no/low load you can use a lower numbered viscosity oil so as not to drag down the flow of the movement. The slower the movement/higher the load, the higher the viscosity is required so that the lubricant can take the pressure without being pushed/squeezed out of where it is needed.

That is the general rule of thumb but you should use the correct viscosity oil for each part as to not cause running problems or premature wear in the movement.

Hopefully that has answered the question but lubrication questions can sometimes open a can of worms as different people do different things.

Lee

Last edited by ankrett; 03-17-2019 at 06:21 AM. Reason: Correcting spelling and punctuation :-)
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Old 03-17-2019, 06:18 AM   #4 (permalink)
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I've just had a look at kinematic viscosity, and its quite in depth. I'm sure it has its place in watch making but by far, far too advanced for me and, to me only really relevant to the initial design of the movement.

Going by what I can understand of it, it is the measurement of how fast a fluid is flowing when a certain force is applied to it, where as dynamic viscosity is force required to move a fluid at a certain speed.

For me that means (these figures are just plucked out of thin air just for an example),

Kinematic viscosity :- fluid x is flowing at 10 mph when 10lbs of force is applied.
Dynamic viscosity :- 10 lbs of force is required for fluid x to flow at 10 mph.

Like I have stated this is quite in depth and I think I have it the correct way round but I am also often wrong.

Lee
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Old 03-17-2019, 08:40 AM   #5 (permalink)
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Quote:
Originally Posted by bk_lake View Post
Oil question. Getting the popcorn out.



In car terms, the engine turns fast 10W-30, the transmission slower 75W-90W, rear end even slower 90W-140. Mobile One of course.
I like the way you think.
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