InkRose
11
Just a gut feeling
Sep 10, 2009,07:11 AM
I'd imagine a 24h chime would need at least a new, rather larger hours rack to be made. I suppose, if one were to remove the minutes/quarters bits then there might be room for that, but otherwise it might also end up needing a new case if the total thickness increases. And of course, if the rack were to double in size, you'd probably need a stronger (or at least longer) spring, which in turn may need a heavier regulator (or 'governor', as I think the part is called that keeps the pace of the striking even), not to mention a larger barrel for the striking side, and so on.
I'm about as far from an expert in complicated watches as a watchmaker can get, though, so my opinions are best taken with a generous pinch of salt. But I doubt it would be trivial for anyone to make such a modification to a striking mechanism. Getting the hour hand to do a full rotation in 24 hours shouldn't be much of a problem for someone with the skill and the tools, although, again, vertical space may become an issue.
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Converting an sonnerie with conventional display to 24H display
By: nwk00 : September 10th, 2009-05:52
Hi, I recently purchased a Jaquet Droz 24H display watch and am so please with it that I am thinking of converting my AP sonnerie to this kind of display. Is it a very complicated job? (converting a two handed watch to 24H display with single hand sounds ...
Will you want the Sonnerie
By: aaronm : September 10th, 2009-06:11
to sound the chimes for the 24-hour display, or would a 24-hour display and conventional 12-hour sound be ok? Congrats on the JD, by the way, very nice piece! A
Will 12H or 24H chime make a big difference?
By: nwk00 : September 10th, 2009-06:25
Sorry I am not too familiar with Sonnerie mechanism. I am guessing from your question you think 12H should be straight forward and 24H probably very, very complex? 24H would be great but I guess I can live with 12H to keep costs down.
Just a gut feeling
By: InkRose : September 10th, 2009-07:11
I'd imagine a 24h chime would need at least a new, rather larger hours rack to be made. I suppose, if one were to remove the minutes/quarters bits then there might be room for that, but otherwise it might also end up needing a new case if the total thickn...
Your gut instinct is correct.
By: ThomasM : September 10th, 2009-07:19
NWK, since you mentioned "to keep costs down" I would not advise it. There are lots of watchmakers who will happily work on a sonnerie, even at very low cost; less than 1% of them I would trust with mine. Fixing a Sonnerie that has been screwed up? Expect...
Your guess is right
By: aaronm : September 10th, 2009-07:23
changing the display would require some new parts: new canon pinion and a few more gears on the dial side, but nothing much changed in the movement proper. Changing the chime to 24 hours would require reworking the entire mech, both to count hours to 24 a...
Thank you everyone.
By: nwk00 : September 10th, 2009-21:29
The knowledge of this forum never fails to surprise me. Will digest what has been written since it is not as trivial as I imagined it to be. regards
