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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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    • By Calvin
      Hello guys..
      I wanna ask..
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    • By Giuseppe
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    • By perfectkyo
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    • Great tool. I have one of these for my screwdrivers which gives the blade tips a better non slip shape. Expensive but very good.    
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    • Did you remove the cap stones on the balance and fully clean out the old oil? If not the old oil could be gumming up the new oil. Have you checked the pivots of the balance for wear? Checked the jewels for any cracks? Does the anchor snap cleanly from side to side if you nudge it with an oiler with the balance removed?  
    • Wow, thats quite a hoard of Military watches, I own several WWII aircraft clocks and a Navy Deck clock, but have yet to get my hands on any military clocks, thats some serious practice you have had.
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