After a 15-year break, I'm now accepting repair work again!
I do everything from routine cleaning and oiling (full disassembly and inspection, multi-stage ultrasonic cleaning, reassembly and correct oiling using appropriate modern synthetic oils, timing and adjustment as necessary) of automatic and manual-wind wrist and pocket watches to manufacture of unavailable parts for chronographs or repeaters.
I specialize in Accutron tuning fork watches and I have a large stock of parts and many years of experience working on them.
Please contact me and tell me how I can help you. If you are a collector I've previously worked for, I'd especially like to hear from you.
|Rewound 2-wire Accutron coil||24 February 2018, 19:55 UTC|
This is the coil in the video below, finished.
|Animation of a rewinding operation||24 February 2018, 17:06 UTC|
|Second rewound coil, better result||14 February 2018, 0:09 UTC|
This second try has 2000 and 4900 turns, and it gives a reasonable 4.5uA unloaded. I'm going to try 2000/6000, hoping for a higher resistance than normal on the drive coil, in turn hoping that causes lower amplitude and lower current draw.
If so, that will work better with modern silver oxide cells, which have a higher voltage than the mercury cells these watches were designed for, 1.55 vs 1.35 volts. This isn't usually a problem but does plague some particular 214s.
It would be nice if I could fix that too, while I'm at it!
|Accutron 214 running with my rewound coil||9 February 2018, 22:59 UTC|
A 214 movement running with my cell-side coil (the one on the right). On the first try I didn't get either resistance very close to what I wanted (I got 1.91k, 7.40k with 1850 and 5500 turns respectively, and wanted 2.2k, 6.0k) and the current consumption is a little on the high side. I will experiment with the number of turns. I should probably use the unspooler to measure the wire length, instead of the coil itself, because the diameter on the spool of wire changes very little, but the diameter of the Accutron coil changes a lot as winding progresses. (Click for more pixels)
This 0.015mm wire is about 1 ohm/cm!
|Rewound Accutron 214 coil, completed||9 February 2018, 22:34 UTC|
The completed coil. It works!
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