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Giuseppe

Regulating a 7750 with Etachron

Question

I'm having some unexpected behaviour from a eta 7750 that I'm trying to regulate after servicing.

I went through service procedure using correct lubricants.
Everything went fine. Actually I have some doubt on lubrication of incabloc wich I'm not sure I did correctly since I'm afraid that too much oil was placed in one of the two stones.
The fact is that when I finished I wasn't brave enough to clean and lubricate it again ... shame on me but I felt that task to be very very difficult.

Anyway after reassembling the watch I had it at my wrist for a week and it showed a great consistency at -10 sec a day.
It'a stop grade movement and resting at night in DU, DD 9UP and 3UP positions always showed something between -14 -6

I was very happy with that result and I thought that a little regulation would have brought it to a very fine time keeping.

Then I reopened the caseback and slightly moved etachron arm, that was resting in a nearly neutral position, in the + direction.
Nothing happened (measuring with timegrapher open source app)

Did it again, another slight push.
Nothing

? ok I must have gone the wrong direction, then pushed all the way toward   - 
Nothing happened.

Ok this is annoying, all the way toward +
nothing

here I am, 
what I'm I missing?
How come moving the regulator arm from - to + does not make any variation?

I'm lost

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    • That's good shout. I suspect they may have had multiple sources for the balance, and thus the shim was fitted in some cases, to allow them to compensate for the 0.1mm or so difference between shaft lengths. The shim can be source of problems though as it can act as a pivot point if it is not fitted in entirely the right spot, and this could introduce errors in the balance alignment, and it does introduce the possibility of either forgetting to re-fit it, and screwing the balance down hard on to the jewels, thus damaging the pivot(s) and/or the jewel(s), or fitting it when not needed if a different "compatible" replacement balance is fitted which has a shorter shaft, and then getting in to head scratching mode when the thing rattles around like a pea in a biscuit barrel.
    • Thanks for the answers. A more detailed description first: I reassembled, oiled the pallets with 941 and let the watch run for 48 hours dial up.  Then I did the poising and after a full wind the first measurement on the timegrapher with result +2/0/+2. Then I wore the watch (normal day in the company) for 24 h. Then after a full wind second measurement with result +9/+7/+9.   So maybe the mistake was to let the watch run static in dial up position instead of "shaking" it while wearing? Or the period of 48 hours was too short? Right now the watch is on my wrist and I am observing the "real" gain compared to the atomic clock. 
    • Or is it simply they use the balance cock on more than one caliber and the shim lets them do this?
    • Clockboy furnished  the link to a HS producer in England. 
    • A sunny window close by or any heat source can cause slight variations in viscosity of the oils. Looks good to me, so regulate and job-done.
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