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18 September 2006, 06:49 PM | #1 |
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Rotor Mass !!
Okay, guys....serious thread!!
Do watch manufacturers pay much importance to the mass of the rotor in determining how that mass affects the performance of the watch? For example, how is the mass distributed? Does a heavier rotor bring about a better performance and power reserve from the watch? Anyone can throw more light on this subject? Thanks - JJ
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18 September 2006, 07:17 PM | #2 |
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Relatively speaking,the rotor must be fairly heavy to be affected by gravity as you move your arms.In your case JJ quite quickly to keep your watch fully wound.But the most important is how efficient the rotor turning this mass, into energy, though the gear trains,to keep the main spring wound.Think of how a gear box on a car works, to transmit power though the drive train to the wheels.
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ICom Pro3 All posts are my own opinion and my opinion only. "The clock of life is wound but once, and no man has the power to tell just when the hands will stop. Now is the only time you actually own the time, Place no faith in time, for the clock may soon be still for ever." Good Judgement comes from experience,experience comes from Bad Judgement,.Buy quality, cry once; buy cheap, cry again and again. www.mc0yad.club Second in command CEO and left handed watch winder |
18 September 2006, 07:19 PM | #3 | |
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Quote:
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18 September 2006, 07:29 PM | #4 | |
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Quote:
much energy it can store.
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ICom Pro3 All posts are my own opinion and my opinion only. "The clock of life is wound but once, and no man has the power to tell just when the hands will stop. Now is the only time you actually own the time, Place no faith in time, for the clock may soon be still for ever." Good Judgement comes from experience,experience comes from Bad Judgement,.Buy quality, cry once; buy cheap, cry again and again. www.mc0yad.club Second in command CEO and left handed watch winder |
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18 September 2006, 08:41 PM | #5 |
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Dunno about that, Peter. This goes back to the zero-gravity thread. It's not so much a matter of the weight of the rotor (affected by gravity), but instead its mass, which determines the rotor's inertia regardless of the plane in which the force acts. The ration of the rotor's inertia to the spring's resistance would be the key equation IMHO.
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18 September 2006, 10:30 PM | #6 |
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:o) damn someone brought up one of my old threads!!! "This goes back to the zero-gravity thread."
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18 September 2006, 10:36 PM | #7 |
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"Someone"? "SOMEONE"?!!!! What am I, chopped liver?!
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18 September 2006, 11:05 PM | #8 |
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And what's wrong with chopped liver?
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18 September 2006, 11:08 PM | #9 |
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Here's an interesting tidbit. On the women's Rolex watches, the rotor they use doesn't have enough mass to fully wind the mainspring, such that if you wore it long enough to theoretically give it a full wind and then let the PR run down, it will 'die' many hours before what it is spec'ed to have as a PR.
You'd think Rolex would address this with a more dense metal for the rotor (like lead, platinum) but they don't. |
18 September 2006, 11:14 PM | #10 |
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Nothing, unless you happen to be donor of said liver.
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18 September 2006, 11:17 PM | #11 |
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Did you hear the chicken complain? I didn't hear the chicken complain.
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18 September 2006, 11:19 PM | #12 | |
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Quote:
Note the 22C rotor weight. There are differences in efficiency depending on how the winding is configured - bidirectional winding or single direction. Where one system only winds in one direction, for a given movement of the rotor you get more winding of the main spring since energy is not lost while changing the gearing to wind in the other direction. It is largely accepted that most bi-directional systems are more efficient, although some less so than others. The key point here is that you don't get "2 times" the winding because it winds in both directions. The power reserve is another issue altogether. The power reserve can be extended by a single larger spring, or by more than one barrel. In either case, some efficiency might be lost because the single spring is wound to a higher tension, or there must be a mechanism to wind the second barrel after the first is fully wound. Disclaimer - I have only recently started looking into this area of watch technology so my answers are subject to correction. It is certainly something I am interested in knowing more about. |
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18 September 2006, 11:42 PM | #13 |
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By that point in time, the chicken's just too damn gutless.
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19 September 2006, 01:24 AM | #14 |
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Did you read last months Watchtime?
Had some interesting articles from various watchmakers about bidirectional or unidirectional auto winding also.
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19 September 2006, 01:43 AM | #15 |
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19 September 2006, 02:00 AM | #16 | |
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Zero Gravity Thread?
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How DID the Omega(s) get on in 'space'. Anybody know? FB. |
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19 September 2006, 02:16 AM | #17 | |
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Omega moon watch http://www.rolexforums.com/showthrea...ht=omerga+moon Zero gravity. http://www.rolexforums.com/showthrea...hlight=gravity
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ICom Pro3 All posts are my own opinion and my opinion only. "The clock of life is wound but once, and no man has the power to tell just when the hands will stop. Now is the only time you actually own the time, Place no faith in time, for the clock may soon be still for ever." Good Judgement comes from experience,experience comes from Bad Judgement,.Buy quality, cry once; buy cheap, cry again and again. www.mc0yad.club Second in command CEO and left handed watch winder |
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19 September 2006, 02:28 AM | #18 |
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hmmmm go figure a gutless chicken.. ;o) and to loose it's liver to the chopper.... damn.....
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19 September 2006, 03:10 AM | #19 |
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You should have seen it when it was running around with its head chopped off.
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19 September 2006, 03:13 AM | #20 | |
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P.S. Why did the chicken cross the road? ..Hey! Now you guys have me doing the chicken thing too!!? |
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19 September 2006, 03:28 AM | #21 |
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To get to the other side I presume?
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19 September 2006, 03:38 AM | #22 |
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Or as said by Neil Armstrong:
One small step for a chicken, one giant leap for poultrykind.
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ICom Pro3 All posts are my own opinion and my opinion only. "The clock of life is wound but once, and no man has the power to tell just when the hands will stop. Now is the only time you actually own the time, Place no faith in time, for the clock may soon be still for ever." Good Judgement comes from experience,experience comes from Bad Judgement,.Buy quality, cry once; buy cheap, cry again and again. www.mc0yad.club Second in command CEO and left handed watch winder |
19 September 2006, 03:52 AM | #23 | |
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19 September 2006, 03:52 AM | #24 |
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A bit meager I think (Like chicken breast )
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19 September 2006, 04:11 AM | #25 |
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Guys,
Thanks for the intelligent (Al, Padi)) and the usual crazy hijacking remarks!! I noticed Ed time and again making repeated attempts at hijacking this thread, but each time someone did bring it back on track!! Johnny, valid point about the ladies watches. Zemina's previous TT DJ did have this problem. She had to ensure she wore it at least 8 hours a day. If she didn't wear it for a day and a half it would stop. However, with the 2235 movement in the Lady YM, she has no problems at all. This movement is rated with a PR of a whopping 50 hours and it just keeps going on and on. Cheers all - JJ
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19 September 2006, 09:22 AM | #26 |
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Oh, that bloody tears it! I make the distinction between mass and weight and point out the role of inertia, and Al and Peter get the kudos? JJ, you're itching for an infraction here - that constitutes an insult!
By the way, the duck stayed on his own side of the road just to prove he was no chicken.
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