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Showing content with the highest reputation on 10/14/21 in all areas

  1. I picked this up at a resale shop for 20 bucks. I think I got a good deal.
    2 points
  2. Thought it may be worth to share; I received a pretty beaten up, none-running 1890-1900 cylinder-escapement pocket-watch. It had all sorts of problems, a list too long to go into details. Among those problems was a bend/broken minute hand. It inevitably broke off when trying to straighten it. The center-hole diameter of the minute-hand was 0.5mm and the length was 15mm. The hour-hand had a hole diameter of 2.0mm and the length was 10mm. Searching the internet to find an identical set proofed futile. The watch is a heirloom so originality was a priority. The hands turned out the be made of bronze, a copper-tin alloy. Therefor it made sense to attempt soldering but the part that had to be soldered had a thickness of only 0.3mm. Both parts had to be fixed in place with a sort of clamp capable to fixing both parts, being heat resistant and "none-sticking". A soldering iron, even with the smallest tip, would be far too big for the job and to avoid touching the parts, I choose to use a hot-air gun used in electronics for soldering SMD-components to a circuit-board. A few test were made which tin to use and at which temperatures. 300 degrees C with tin used in electronics seemed to work fast and made the tin to flow nicely. I used a soldering flux-paste. The clamp consisted of two metal rails, slightly diverting from each other to give many clamping options, bolted on a plate of gypsum. Pulling over a #1000 grid sand paper, I made two 45 degrees chamfered edges on either end of both parts; The two parts were clamped in; Applied some soldering flux, heated it all up to 300 deg.C and applied a tiny bit of tin. Once cooled down, I removed some excess tin with a small diamond file. Here a picture of the back side of the minute-hand; And here the front; the tin didn't flow further away from the soldered joint or around the edges Most likely not the strongest repair in the world, but when not touched it should be strong enough to do the job. On the picture the hand color looks black, but that's due to the lighting. In reality the hand hasn't lost any of its shiny patina at the front ...... Anyway, I thought to share this repair as one of the many different possibilities
    1 point
  3. Belt and braces. have a try and see if you are sucessful. Desoldering gun sound best.
    1 point
  4. Ah yes Magnetism can be a watchmakers friend ,in more ways than one. Picking up lost parts and to get to work........
    1 point
  5. John it is very rare indeed for a post is removed. Us mods are a very tolerant group allowing all views and keeping the forum a friendly place to visit. There is always the “Relax zone” for posts not relating to horological subjects.
    1 point
  6. Or you can visit one of our Swedish stores none of us visit but still have all their products at home.. a clue
    1 point
  7. There are any number of options if you want to spend the money. Surface mount rework stations, soldering hot plates, hot air guns, gas soldering guns, infra-red soldering lamps, ultrasonic bonding, friction welding, spot welding.... All have the pluses and minuses. However I like to keep things simple, so a soldering iron or hot air gun, and fine gauge solder with flux, or solder paste with flux sound like the simplest solution, particularly for a one off like this.
    1 point
  8. Nice. Let me share a little tip. Solder paste. Specifically "Mechanic" branded Chinese solder paste from ebay. This stuff is used for SMD soldering, particularly small runs and SMD rework, and comes in leaded and unleaded. I would suggest the leaded version is better, as it is easier to use, but obviously, don't go eating it, and wash your hands after use. https://www.ebay.co.uk/sch/i.html?_from=R40&_sacat=0&_nkw=mechanic+solder+paste&_sop=15 If you buy from ebay, make sure you are buying the solder paste, and not just the flux with the same brand name. The paste has a built in flux, and consists of micro-beads of solder. The advantage of using this, over solder wire, is that you can be very precise, in the amount you use, and the location you put it in. It makes soldering tiny electronic components much simpler, and would probably have been ideal for this job.
    1 point
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