Technology Gone Mad???
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Oh, I see ... I'll just have to wait for the answer from Longines, and I will tell you. When disassembling the watch, I noticed some figures on the back of the dial. I don't know whether they mean anything. Thanks to all of you! -
I will definitely look for interference when I open it back up. You make good points. The part that makes me wonder is the fact that it snaps around well if I do it during the day whilst I'm wear it and assume it has more 'wind' than at midnight. -
I doubt it is due to lack of amplitude. My 7750 - which I haven't serviced yet because the numbers were OK (and I am still scared of chronographs!)- has no problem flipping the date with an amplitude closer to 250º On other movements I have had issues where the plate(s) that go over the calendar wheel interfere. I did an FHF ST 96-4 last week where there are 2 tiny plates plus a larger plate that hold the calendar wheel in place and I had real problems getting the calendar wheel to snap around nicely. Lubrication on the points of the teeth of the calendar wheel and making sure the small plates were aligned properly was the solution there. -
Well I spoke too soon. Here's where I am now with this issue. I replaced the date jumper and all seemed to function correctly. Fully wound and only in the movement holder, no dial or hands, I let it sit untouched for two days. Both nights it advanced the date. The second night it might have been just shy of fully advanced. Seemed as though I fixed it, so I reassembled the watch. Three nights in a row the date did not advance. Once I pull the crown it does. So you might think that it's the dial interfering, but here's the weird thing. If I advance the date during the day to 11:57p and watch it get to 12:00:30a the date flips with gusto. So here's what I'm thinking and could use your council. I installed a new Swiss mainspring. I used Moebius 8217 braking grease on the barrel walls. It seems to wind quite a bit before slipping, but does slip. I've read that the 7750 really needs Kluber p125 as a braking grease. Do you think it just doesn't have enough power after a few to several hours of sitting before the date change? Here are the TG numbers after service: Rate +1s/d, Amp 301, BE 0.0ms
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By RichardHarris123 · Posted
I've managed with the ones I have but 1.8 mm would be better.
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