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Peter-H

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Everything posted by Peter-H

  1. On the original Q, if the motor is a brush motor then a normal lamp (light bulb) controller should work. Get one which can do a few hundred watts. If it is brushless, it will probably be a capacitor start motor (you can see a cylindrical component strapped to it) these cannot really be speed controlled. Well, it can be sort of made to work... The best thing is to get a small 3 phase motor and a speed controller known as a variable speed inverter. Control Techniques make them in loads of sizes, down to a couple of hundred quid, and the motors are on Ebay for probably less. You get beautiful speed control that way, and no brushes to wear out. The inverters can take a potentiometer so you can have a knob on that. I have one here: Commander SK.
  2. I just randomly popped in a year later... Very interesting post by nevenbekriev above. Didn't see it last time. But also I don't know a watchmaker who would do such a job. I also see one of the mods removed my comment above that I would sell the watch Perhaps surprisingly it has been working for the past year, no problem. Worn 24/7/365, survived 2 ski trips, lots of off road biking. My guess is that IWC must have demagnetised the parts. They do claim to take the watch completely to bits and check each part. They never communicated in any way whatsoever regarding anything specific to the watch; a weird corporate policy which is the complete opposite of their ultra smooth posh image where they send you standard letters with phrases like "thank you for trusting us with your timepiece" It's clear the staff are not allowed to make any comments on a particular customer's watch, report what they fixed, etc. Only if they are charging for something, like the "cracked" case, will they say anything. I did pop into a number of watch shops asking how much they would offer, and it was always about 50% of the Ebay prices. The problem with Ebay is that you can get scammed so easily. So I am keeping it. But I would never buy such a watch again, and neither would anybody who I have told the story to. I am sure people who buy e.g. Rolex get the same situations. A friend who has a collection of IWC watches says Yes this is normal; you budget for £500/year in maintenance.
  3. Indeed; these fancy Swiss watches are basically junk. Good for sitting on a winder and you put them on according to the clothes you want to match
  4. Update: the watch ended up running 8 secs/day too fast so given that it had a 2 year warranty after that IWC repair, I sent it back to them. It came back a few weeks (!) later and it is now running 5 secs/day fast
  5. I was told, maybe wrongly, that the 7750 mechanism has separate adjustments for different orientations of the watch.
  6. A data point: the 7-8 secs fast has come down to 4-5 secs. Is that normal?
  7. Evidently they can be adjusted better, so why don't watchmakers do it? Does it take longer to do? My understanding is that these watches (ETA7750 etc) have several adjustments, for each of several orientations. But does it actually take longer? I have read from IWC that their company policy is to never have an IWC watch run slowly so if they allow 7 secs it means they adjust for 3.5 fast, plus or minus 3.5 seconds. Yet I had this watch adjusted for zero, plus or minus about 1 second.
  8. It is not causing me any stress; thank you for the patronising answer. I asked a reasonable technical question.
  9. I think the spec is 4 seconds a day. It is an IWC-modified ETA7750. Currently, fresh from an IWC full service, I am seeing 7-8 secs a day. The watch had been to another "trade" watchmaker previously (to unsuccessfully attempt to fix the 3 sec per minute intermittent fault which I posted here previously) and he got it within 1 second a day, so clearly this is possible. He said he was Omega authorised. And that was before IWC got it for their £500 service, prior to which they reported a list of faults e.g. wrong power delivery, wrong this and that, loose hands, you name it.
  10. Yes it looks just like new and I have a 2 year warranty on it. It will have to go back to IWC though because (on a better measurement) it gains about 8 seconds a day. The lesson is: never spend more than a couple of hundred quid on a watch!
  11. The funny thing is that the watch now gains about 3 seconds per day, after the £2200 IWC job, whereas the previous watchmaker was able to get it within 1 second, each time. Except when it was gaining 3 seconds per minute ;)
  12. They go on Ebay for 5-6k and that is in unknown condition and no warranty
  13. The watch has come back from IWC. Looks perfect. I am a bit nervous about the ceramic however *edited*
  14. I never abused the watch. Those chips in the ceramic are a mystery, but if they are the result of normal wear, that material is totally unsuitable for a watch. Maybe for posing The ETA 7750 movement on which this watch is based should be plenty robust enough, however.
  15. I have been looking at the strap attachment options and it sounds like with these ceramic watches the important thing is for the pins to be the most rigid type you can get. That also means choosing the length to be the maximum that will fit - to minimise the potential for the pin wobbling sideways. Also you need to make sure the diameter of the end portion is not a tight fit into the hole in the watch case. If it is a tight fit, it will create an enormous localised stress in the ceramic and chip a piece out of it. IWC's "we won't touch a watch which has any damage to the case" attitude doesn't help... it is really good for revenue generation though! I also wondered if it would help, if using a flexible strap e.g. fabric or silicone rubber, to somehow insert a metal link next to the watch and have the strap attach to that. That will prevent the pin getting flexed. Has anyone in the business here come across any of this before? Or maybe my watch had been attacked by a monkey?
  16. I don't think IWC ever understood the 3 sec per min issue was intermittent. Or maybe somebody deep in there did/does but the written response is illiterate. A year ago I sent them a movie proving it (posted in the other thread) because basically nobody believed it was possible, and after a lot of hassling their switchboard I sort of got a confirmation that somebody did watch it, but they were totally non committal as to the possible cause and how much it might be, worst-case. Very difficult, but not untypical for a present-day huge company (which I am sure they are NOT) set up to isolate the customers from the internals. I never ever got through to anybody who knew anything about watches. Yes swapping the case is the only obvious explanation, but who would do that, and why? IWC must have good security, which (based on some other businesses I know, where customers routinely haggle about what they sent in and in what condition) very likely involves a video of the person opening and closing each package.
  17. A very good point about a non-metal strap. That will try to bend the pins, whereas a metal (rigid) strap will just pull on them perpendicularly to their axis, which will greatly reduce the stress on the ceramic, around the pin holes. So I need to find a strap which has metal links at the watch end, and the rest is something which (a) doesn't pull hair out and (b) is ok with daily swimming. I wonder if there is such a thing. BTW does this forum software allow messages to be edited after saving? I see no button for it. Maybe it is disabled until you have reached some number of posts.
  18. I am paying the 2.2k. The Ebay option would be doing a dirty on somebody, notwithstanding the fact that "half" the sellers on Ebay do that already But I want to get hold of the "correct" pins, whatever that means. Regards ceramic cases, they don't scratch so look like new for many years, whereas metal cases look quite naff quite soon. But obviously ceramic lugs are a weak point. There are many pics online of IWC lugs having broken right off. I am also surprised by the IWC report of a badly damaged gear train. How much of a shock would it take to do that, while ending up with a watch which is still accurate to better than a second a day afterwards - as this one was, all the time it wasn't gaining 3 seconds per minute? I am disappointed with IWC communications. The people you speak to know almost nothing about watches and are clearly under instruction to say as little as possible, while the people who actually do the work are absolutely banned from any contact with customers. So you just get bland descriptions and no way to get to the bottom of anything. But hey this is the way of most organisations these days... Those which aren't full of idiots keep the smart people well behind the customer interface.
  19. I wonder if there is a specific vulnerability here, in the spring pins naturally flexing (as the strap gets pulled, with normal arm movement) and exerting possibly large forces against the sides of the holes in the ceramic. Such forces would place the ceramin under tension, and we all know it is very weak in that mode. Are there special pins for these watches? I have been using just normal pins. I use a silicone rubber strap (ex Traser watch) because I swim every day and a leather one gets smelly I don't like metal ones due to hair pulling. I also wonder about that oval shaped depression. It could not have been created just with a knock, because this material is really hard. It would have just smashed. It looks like a manufacturing defect. But it isn't visible in my original post-purchase pics e.g. The only possible explanation (case has been swapped) is pretty serious and not one made lightly.
  20. This thread refers: The fault came back. The original watchmaker who "fixed" it a few times stopped responding to emails or phone messages, this time. So I sent it to IWC... They quote the £500 standard service plus £1700 for a new case! They sent me some photos which show tiny chips where the spring-loaded pins go. Some of these are very hard to believe they were there when I had the watch, and I have earlier photos which prove they were not there. So either the package came open in transit and got smashed (IWC discarded the packaging) or somebody at IWC messed with it (very hard to believe). They tell me their procedures make an accidental swap with somebody else's watch impossible. Obviously a metal watch would never get this. I am now stuffed. The watch is almost worthless unless I pay out the £2200. IWC refuse to do a service without changing the case. I could do what a lot of people do and put it on Ebay and get a few k for it, without disclosing the intermittent timing issue. But at least I will have a "as new" watch with a 2 year IWC warranty. Pretty obviously it is really easy to chip this ceramic. I have the correct tools for compressing the spring pins, and I use the tool from the bottom of the case, whereas in the above pic somebody used some kind of a tool from the top of the case. This oval shaped depression is also interesting. and this photo shows what might be a hairline crack Lesson: never buy a used watch unless it comes with a manufacturer's service!
  21. Capitulation. It's going back to IWC for the 500 quid service. They probably won't find anything wrong. I included a flash stick with the mp4 video showing the problem...
  22. The watchmaker who worked on this watch several times is Omega authorised so I would expect him to know how a watch works, especially as these use the same ETA7750 movement which half the auto chrono watches out there use (with modifications). Would it be possible that he would not have spotted it? Also it is exceedingly intermittent. More now than before. If I had not done the videos (posted earlier) absolutely nobody would have believed me. I am an "engineer" (electronic, electrical, mechanical) and to me it is obvious that something is getting moved / getting caught on something / etc and this happens when the watch gets moved in a certain way, and you can get out of it by gently bumping it. For sure the rapid time advance is not terminated simply by winding the watch up a bit, or by using the stopwatch. I don't think the hands are dragging; that would make it run slow, not fast, surely?
  23. Sadly, almost a year later it has done it again. Same 3-4 seconds per minute. I found I can "fix it" by dropping it onto a table on its back from about 2cm. Doing the same on its side(s) would not fix it. I have been in contact with IWC. They try to keep their communications "awfully posh" and non committal You can almost hear the Eton accent I doubt the shop will want to have anything to do with it now, so my best option is the 500 quid IWC service. I presume it is to some extent a "fixed price" unless they find something dramatic? One issue is insurance. The most I can get for Royal Mail Special Delivery is 2.5k but the watch is worth about 5k. The last watchmaker who fixed it has his own insurance cover for 25k, but IWC don't seem to have any such thing. They suggest taking it to some shop in London but that's a whole day wasted for me.
  24. One advice I got from a watchmaker is to warm the watch on a radiator and then place an ice cube onto the glass. If that mists up, there is water in there. I can easily understand this from the point of view of physics, temperature and dewpoint. There is no condensation at all. I actually wonder if watches are assembled in dry air. They should be because if assembling on a humid day, say dewpoint = +10C, then anytime the watch goes below +10C it will mist up. Normally it won't because it is on your wrist but it doesn't sound like a good procedure. BTW why is the text font so thin? It is barely readable.
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