HiBeat
Global Moderator
SEIKO Iko Iko GDTRWS
Posts: 8,685
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Post by HiBeat on Sept 13, 2017 8:53:29 GMT -8
See my point? Unless you truly wear one particular 6139 a lot (and I know some guys do) then it's a moot point. In my book and I want to wear them 'ready to start timing' like every good chrono should look on the wrist. That's what a 6139 on the wrist should look like ! Must be nice to have such an extensive 6139 collection, us poor folks have to choose from just a couple. Well I had the massive 6139 sell-off to fund the SLA017 acquistion, but who can forget the All-Star Team ? ( Click on pic to enlarge)
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Post by SeikoPsycho on Sept 13, 2017 9:01:47 GMT -8
Hey guys... I know it is accepted that it is better to leave the chrono running, but if I prefer not to does it significantly hurt the movement or is it just one of those "not recommended" type deals? Also, are original hands easy to come by, or do we rely mostly on AM now? Thanks. Tony, I will take the contrarian position on how I run my 6139- chronos. Yes, I totally understand the whole clutch/wear analysis, and I do not doubt it. But guess what? I like my chronos hands-up laying in wait when I wear them. I don't want to see the sweeper moving around or the subdial off 30 until I am actually timing something. So how do I stand myself for subjecting them to all this 'excess wear'? Frankly I don't care. I mean, if I wear each 6139 1 day a month and it runs down over the next 2 days such that every time I pull it out of the watch box it runs for 3 days, and I wear it once a month, then that's 36 days of usage a year. So in 10 years it will be the equivalent of 1 full year's worth of continuous running. I can modify this strategy to start the chrono when I put it onto its pillow after a 16 hour day and back into the box and extend this to 45 years to equal one continuous harmful year of running with the chrono stopped. See my point? Unless you truly wear one particular 6139 a lot (and I know some guys do) then it's a moot point. In my book and I want to wear them 'ready to start timing' like every good chrono should look on the wrist. That's what a 6139 on the wrist should look like ! I use to keep all my 6139 chrono's in the stopped position. I was under the impression that if keeping the chrono stopped caused an issue we'd see more failed vertical clutches. After learning the ins and outs of this movement and studying the vertical clutch and how it operates under magnification, I've changed my view point. It's best to keep it in the running position especially when the watch is not in use. Actually, your line of thinking is incorrect. Even when the watch is not being worn and is not running, if the chrono is in the stopped position, the vertical clutch is being depressed, thus weakening the spring.............
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HiBeat
Global Moderator
SEIKO Iko Iko GDTRWS
Posts: 8,685
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Post by HiBeat on Sept 13, 2017 9:11:33 GMT -8
Frankly I don't care. I mean, if I wear each 6139 1 day a month and it runs down over the next 2 days such that every time I pull it out of the watch box it runs for 3 days, and I wear it once a month, then that's 36 days of usage a year. So in 10 years it will be the equivalent of 1 full year's worth of continuous running. I can modify this strategy to start the chrono when I put it onto its pillow after a 16 hour day and back into the box and extend this to 45 years to equal one continuous harmful year of running with the chrono stopped. In my book I want to wear them 'ready to start timing' like every good chrono should look on the wrist.I use to keep all my 6139 chrono's in the stopped position. I was under the impression that if keeping the chrono stopped caused an issue we'd see more failed vertical clutches. After learning the ins and outs of this movement and studying the vertical clutch and how it operates under magnification, I've changed my view point. It's best to keep it in the running position especially when the watch is not in use.Actually, your line of thinking is incorrect. Even when the watch is not being worn and is not running, if the chrono is in the stopped position, the vertical clutch is being depressed, thus weakening the spring............. OK Tom that you for that, I certainly respect it. I will begin to store them in the 'running position' whenever not in use in the watch box, thank you for that tip. However I will not wear them running. To me, a chronograph looks best at it's 'straight up and tall' position announcing to the world 'hey I'm a chronograph waiting for my master to start timing something." Silly? Maybe. But that's how I roll. I want to see all my chronos looking like chronos. Vintage, modern, auto, quartz. 6139 7016 7TXX 8L48 Valjoux 7750 No Matter. All of 'em. They are chronos, I want them to look like it.
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Mr.Jones
Needs a Life!
Hamburg, Germany
Posts: 4,679
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Post by Mr.Jones on Sept 13, 2017 12:59:54 GMT -8
HiBeat , I'm kind of with you on that point Jon. I hate wearing my 6139 and seeing the subdial not indicating the correct minute of the hour. Sad, I know, and perhaps a little OCD (and I do realise it's designed as a timer and not a minute sub-dial to mimic the minute hand) but it drives me nuts. So when I wear mine, which is perhaps every few weeks, I always start the chrono running either on the hour or half hour. I just have to hope then that I don't inadvertently stop it while wearing it See that's my point - you wear the watch every few weeks - so who needs to worry about 'excess wear' issues ? As far as I understand the issue, the "wear" is on the spring keeping the clutch plates separate. So it doesn't matter if the watch runs or sits in the box - as long as the chrono is not engaged, there is some kind of wear (spring looses tension). So by all means, wear it any way you like, with or without the chrono engaged - just engage the chrono before you put it away to ease the tension on the spring. Aside: I don't really understand how that can be, as in the "chrono off" position the spring would be relieved mechanically, no? Maybe I need to take a look at a chrono center wheel... Edit: seems I missed a page. What he said.
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Post by SeikoPsycho on Sept 14, 2017 3:40:21 GMT -8
In simpler to understand terms: it's similar to a "horizontal" clutch in a car. When you depress the clutch pedal, mechanical or hydraulic, the throw out bearing depresses the fingers on the pressure plate "essentially a disc spring" which relieves pressure on the clutch disc which in turn disconnects power from the engine to the transmission.
With the "vertical" clutch, when you stop the chrono, 2 small fingers lift the chrono plate against 4 small spring tabs, "a tiny disc spring", allowing the chrono to stop.
Now imagine if you were to park your car for several months placing a stick between the clutch pedal and your steering wheel to hold the pedal depressed until the next time you were to drive your vehicle. Do you think that having the pressure plate compressed all the time would weaken it's clamping ability against the clutch disc + flywheel? Yup, it sure would.............. Same holds true with the chrono vertical clutch.
Jon's thoughts on keeping the chrono in the "run" condition while in storage and then having it in the stopped position while being worn would be a good practice to follow if you prefer to have your chrono as it was meant to be: ready to time something. I don't see this causing an issue over time because we seldom wear a watch for more then a week or two before switching to another watch. It just comes with the territory.........lol
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Mr.Jones
Needs a Life!
Hamburg, Germany
Posts: 4,679
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Post by Mr.Jones on Sept 14, 2017 3:49:18 GMT -8
Ah, okay - now I get it. The spring doesn't keep the clutch plates separated, but it's the tension spring that presses the plates together when engaged. If you disengage the chronograph, you essentially put more tension on the spring. It is mechanically locked in place, but the spring still is under pressure.
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Post by SeikoPsycho on Sept 14, 2017 6:19:46 GMT -8
Ah, okay - now I get it. The spring doesn't keep the clutch plates separated, but it's the tension spring that presses the plates together when engaged. If you disengage the chronograph, you essentially put more tension on the spring. It is mechanically locked in place, but the spring still is under pressure. Bingo! That would be correct!
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Post by seacreechur on Sept 14, 2017 13:28:12 GMT -8
Must be nice to have such an extensive 6139 collection, us poor folks have to choose from just a couple. Well I had the massive 6139 sell-off to fund the SLA017 acquistion, but who can forget the All-Star Team ? ( Click on pic to enlarge) Hi Jon, I didn't see that Sunrise Pogue for sell, did I? Michael
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