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rodabod last won the day on March 3

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About rodabod

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  1. Well, you can be glad that you’ve already attempted some relatively advanced watch repair. I’ve seen some experienced watchmakers struggle with these incabloc settings. Keep an eye out for Chinese spares. Later on, you may be able to replace the entire incabloc setting with a jewelling tool. That’s for a later date though!
  2. Retrofitting a hairspring

    Yes, these smooth-rimmed balance wheels are less flexible when it comes to fitting different hairsprings as there are no screws to attach timing washers, or conversely no screws to remove to lighten. You also have to consider the hairspring material as it should be some sort of Elinvar in order for it to have suitable temperature compensation.
  3. BHI 2018 Examinations

    Hi Olivier! I was going to email you about the mechanical watch exams. Hope they went well. @oldhippy, regarding the exam format, I used to agree with what you are saying, ie. all you need is to learn on the job, and if you can “do it” then that proves that you know it. However, I’ve changed my mind after completing the BHI courses. The theory exam uses various methods to prove that you understand from first principles how everything works. It’s the only simple means that they have of determining that you really understand an aspect in depth. So for example, they ask you to explain via diagrams and text how the drive is delivered from the crown to the winding pinion. Some people will make the mistake of thinking that the stem directly drives the winding pinion for example. All of the theory behind metallurgy I’ve learned through the course syllabus, and it’s just not something that I’ve learned through experience. I notice that many people on this forum know little about the subject - eg. the correct carbon content and temper for a wristwatch screw. A few of us “watchies” struggled more with the clock theory questions. And we realised that it would have been much easier if we’d spent more time physically working on them. So that in itself proves that working on the job helps to aid your understanding of theory. Or alternatively, your understanding of theory proves that you’ve worked on the job..... I think one of the best things about the BHI is that they set a benchmark for the standard of work which watchmakers provide. I’m not saying that anyone who posts here is a “bodger”, but we’ve all opened up enough watches which have been mucked about with by other watchmakers. The practical exams let you prove that you can work to a certain standard, and the theory exams reinforce that by showing that you understand how it works underneath. For me at least, I know that my watchmaking (and clockmaking) skills have improved massively since studying the Theory and Practical courses, and I suppose that’s the main thing that matters for me.
  4. Was anyone else up at Upton Hall this week for their exams? I sat the D4 Quartz Servicing exam and also the D1 Watch And Clock Theory exam. I couldn’t get the case suitably waterprooofed for the quartz exam which I blame on the shoddy case/pendant tube and new crown provided. Otherwise, I got the current consumption right down and the movement built nicely. I ran out of time during the theory exam. And that was me going at full speed, obviously. I think I spent too much time drawing keyless works, just because I am so familiar with them. Roddy
  5. How would one polish/repair this ?

    Be very careful with abrasives. Diamond paste can be aggressive.
  6. Angle the screwdriver at 45 degrees as you try to turn it. You can adjust this angle to be lower if you need more side-thrust.
  7. Another option might be to hold the spring flat on something soft like cork. You could then use a fine needle file (or diamond lap again) to stroke the sides of the spring by pushing the file or lap slightly into the cork as you draw it along the side of the spring.
  8. Look for a cheap-y diamond lap on eBay. You can even get a small one for sharpening fishing hooks for around £1. Holding the work will be a challenge. You’ll possibly have to hold firmly in tweezers and maintain a good angle. You would be removing the most minute amount; just enough to be able to force it in.
  9. Well, you are going to need one at some point! Very handy for finishing the ends of stems, etc. See attached photo: you could stone the edges of the spring hinge equally on each sides (count the number of strokes). It would need to be very gradual so that it only just fits when pushed into the incabloc setting. Alternatively, just a get another Chinese movement, but it seems a bit of a waste of money, especially because the replacement spring will also be an excessively loose fit due to their design.
  10. Watchmakers lathe collets

    I should add that I also own a full set of split collets too.
  11. Watchmakers lathe collets

    ER collets: well, they are very nice to use, and make the choice of collet for the work simpler as they tend to work over a wide range (often 0.5 or 1mm for the smaller types). So, I can survive with just 9 collets to cover 0.5 - 5.0mm range.
  12. Do you have access to a diamond lap (stone) or an India oilstone?
  13. Watchmakers lathe collets

    Ok, well I strongly recommend getting an ER collet set if the collets match the standard “Boley” profile.
  14. Watchmakers lathe collets

    Is this a 10mm lathe?
  15. Other possibilities are a bent or dirty/oily hairspring.