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Type XX - time-setting query

November 1 2006 at 4:21 PM
SL  (Login SLNY)

 
Just got my type XX Transatlantique back from Boutique Breguet in NY where it was sent after one of the chrono button tops came off a few months after it was purchased from an AD. It was repaired under warranty free of charge in a couple of months. While attempting to set the time by gradually turning the winder gently backwards (having pulled it out to the time-setting position) in order to freeze the second hand as I used to do, I noticed that it no longer stops the second hand and that the minute hand alone turns backwards.
This method of setting the time used to work just fine - any ideas as to why it no longer does?
Have not had the watch back long enough to see if it still gains the 6-8 seconds per day that it used to, or if it has settled down.
Thanks
SL

 
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SL
(Login SLNY)

Answer to my own question - from a previous post on this forum.

November 5 2006, 5:31 AM 

This explanation was posted some time ago by ei8tohms and answers the question - FYI

"Hi Guys,

Whether or not a non-hacking movement can be made to stop the second hand with some retrograde pressure on the crown is dependent on the tension on the cannon pinion, the slipping clutch that allows the hands to be set independently of the driving train. In short, if there is enough friction on the cannon pinion, you can stop the watch by putting enough pressure on it in the backwards direction to overcome the power of the mainspring. If it's a little too loose however, you won't be able to overcome the driving force except perhaps when the watch is only partially wound.

Most manufacturer's feel that a "properly" tensioned cannon pinion should be tight enough to allow the user to stop the watch, but it's not universal in my experience, and certainly they can get little looser over time.

_john"

 
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