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rodabod

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Everything posted by rodabod

  1. Check for the hairspring rubbing as suggested.
  2. rodabod

    Loose barrel cover

    Also check that the barrel lid is not domed, as this obviously reduces diameter.
  3. rodabod

    Loose barrel cover

    If you own a lathe then you could spread some of the material (preferably in a vice rather than punching) and then turn it concentric if need be. Has the barrel or barrel rebate been stretched or worn? It can happen when a spring suddenly breaks. On larger clocks this can even shatter the barrel wall (been there).
  4. rodabod

    Running Oh So Fast

    To do a train count (apologies if you know this already), you just need to know the tooth and pinion counts of each wheel from the centre wheel onwards. From there you can calculate how many beats are required to make the centre wheel turn once (ie. one hour).
  5. rodabod

    Omega caliber 613

    Spring shown here:
  6. rodabod

    Omega caliber 613

    That looks like very good performance. Remove the C/S cock and look at where the spring attached. Also check if it is contaminated with oil. You can then very slightly bend the spring (just lift with your tweezers) to create more pressure and therefore more friction to reduce the "slack".
  7. Love these watches! I picked up another Gen 1 last week too which has the better 7A28 movement.
  8. rodabod

    Omega caliber 613

    Do you have the centre-seconds friction spring set correctly? It should cause enough friction to drop the overall amplitude by around 5-20 degrees. With it set too loose, you will see slack in the meshing between the 3rd wheel and CS pinion.
  9. I’ve never had an issue with using a Platax. I’ve seen balance wheels which have damage due to over-enthusiastic work with the graver when a staff has been turned down. But you could easily damage a balance wheel by incorrectly using a Platax.
  10. rodabod

    HELP!!! Screwed up my 2892-A2

    I find it hard to see how you could get such an extreme rate change such as the graph posted below, unless it was related to the vibration of the hairspring. Are you absolutely sure that it isn’t contaminated or rubbing/sticking? I have noticed when working on a relatively new 2824 yesterday that they do seem to be susceptible to drying out and possibly wearing slightly at the escape wheel which results in a sludge embedded in the escape wheel teeth. This can potentially require careful cleaning with pith wood if your cleaning solution does not remove it. However, it’s unlikely to cause as drastic rate changes as you are seeing, unless the overall amplitude was extremely low.
  11. Top skills, Dan. Well done.
  12. rodabod

    homemade cleaning machine ?

    I think that realistically, you could possibly make something from some suitable jars, a basket, and a sewing machine motor. It just depends on suitability of these parts. I wonder if Ikea sell something like a rice or coffee jar with a solid lid which motor could be attached to. Machines do turn up on eBay, but the cheaper ones are inevitably death traps which need work to make them properly safe.
  13. Swap the circuit if you can first, because the height of the hour wheel / canon pinion / CS pinion vary between models. Certainly the one fitted to the Seiko Gen 2 Military chronograph differs to the newest movement available. Can measure the current draw later to see if it’s running well enough to give a thumbs-up.
  14. rodabod

    Thoughts from a beginners bench

    I usually use a Bergeon presto hand lifter. Never had an issue with it, but the copies are terrible. You can dress Indian hand levers to work well, and also use them for lifting hairsprings. I couldn’t work without a timegrapher. You can’t easily evaluate poise and adjustment without one.
  15. rodabod

    threading gone wrong

    Are you using something like a lathe to keep the rod perpendicular to the die?
  16. rodabod

    Slipping second hand

    Quite often the second hand collet will loosen/widen. Tighten in either a lathe collet, a suitably small pin vice, or one of those fancy Bergeon tools.
  17. We used to work on CRTs regularly at work as we had literally hundreds of them. All replaced now, unsurprisingly. One guy managed to vapourise his gold ring he was wearing which lost him his finger, but it didn’t bleed as it was instantly cauterised! The main thing that I don’t like about these watch cleaning machines is the fact that they vibrate and have moving parts, plus you have to handle them quite a lot when using them. I use a Varimatic occasionally, but at least it doesn’t have a trailing cable which constantly gets twisted like it does on some other machines like a Brenray, etc.
  18. 1450V on the secondary..... F* that!
  19. Is that big glass bottle a valve rectifier?
  20. You should be able to replace the original slipping bridle attachment and conventional mainspring (as was the way in the early days) with a standard automatic mainspring. I’ve had the opposite problem where the replacement has been too strong, but this could also be due to the change from blue-steel to alloy.... What you need to do is what Omega recommended back in the day for automatic spring adjustment and measure how many turns of the barrel you get before slipping commences. From what I remember, it’s approximately 4.5 to 5 turns. Then you will also need to measure that current spring to confirm it is of the correct “strength”, ie. thickness and also check the length.
  21. rodabod

    HELP!!! Screwed up my 2892-A2

    Unless you are also seeing fluctuations in amplitude which correspond with the fluctuations in rate, then I would not initially suspect that it is an issue with power delivery (mainspring and barrel). If you are noticing near-instantaneous changes in rate then I would suspect it is an issue with the oscillator.
  22. rodabod

    How to clean these hands and indices?

    It very much depends on how they are made.... could be a very thin plate. Personally, I would not remove the indices as i’d use a sharp piece of peg wood.
  23. rodabod

    HELP!!! Screwed up my 2892-A2

    Obvious and simple things to check when the rate varies like this (plus it’s a newer movement so seems less likely to have an eccentric wheel): - magnetism - sticky hairspring coil, or coil fouling part of the movement.
  24. rodabod

    Case-back threads

    The issue is though, you can only cut the case-back thread smaller, and the case thread larger......
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