Jump to content

Valjoux 7730 Cam Adjustment

mk416

By mk416
in Watch Repairs Help & Advice

 Share

Recommended Posts

mk416 New Member

mk416

Posted
Posted

Hi everyone, 

Thanks in advance for your patience- novice here!

The chronograph function on this 7730 movement starts fine but doesn't stop reliably (If and when the operating lever does engage the stop, the reset works great, however). When I open up the movement case back, I see that operating lever (blue arrow on the annotated stock picture) has a bit of play and moves around, such that if I do engage the operating lever, i.e., begin the chronograph, and then gently push the reset button , the reset lever (red arrow in diagram)  'nudges' the operating lever back into the correct position, so that when pressed, it does stop the chronograph (move the cam). 

I should also note that the tab/spring (where the green arrow points) is  a bit deformed on my movement and doesn't exactly touch the screw. Perhaps this is a contributing factor?

I can't seem to figure out how to resolve this problem. Does anyone have any thoughts? 

 

Many thanks,

M

 

 

 

dscn1501.jpg

Link to comment
Share on other sites
  • 1 year later...
jdm Distinguished Member

jdm

Posted
Posted
1 hour ago, blackmamba said:

what amplitude are we looking at to achive on the 7730

I don't think it different from any other Swiss watch, 250° is a pretty common standard.

BTW, on our friendly forum it's considered polite to introduce oneself in the dedicated section before starting asking questions.

Link to comment
Share on other sites
 Share
Go to topic listing


  • Similar Content

  • Recently Browsing

    • No registered users viewing this page.

  • Topics

  • Posts

    • RichardHarris123
      Without Our Forum

      By RichardHarris123 · Posted

      No John, we don't want Mark to change anything, we are just scared of losing a brilliant forum and losing contact with each other.  As pointed out, this forum is full of knowledge and I for one,  consider the regulars friends. I would hate to lose contact with you and the others.   PS, this forum is really important to me. 
    • JohnR725
      Epilame / Fixodrop

      By JohnR725 · Posted

      one little minor problem with your chemistry experiment here which is what exactly is epilam? In other words is it an exact substance with the chemical you specify or is it a term? For instance originally it was steric acid either dissolved in some sort of solvent or it was applied by vaporizing it. Then now it's all kinds of different things the watch companies all have different ideas there's a whole bunch of patents. So is not always an exact substance.   let me snip out a image from the patent that I attached up above. Notice I highlighted something it seems to disagree with your evaluation.  
    • nevenbekriev
      Pocket watch escape wh

      By nevenbekriev · Posted

      I guess You had to try, as it would be hard to sleep without that try, but, I know the result before the experiment... As I told before, the friction will be so big that the wheel will not turn. The pivots have to be thin and polished - the bigger the number of the wheel (2th, 3gh, 4th...), the thinner the pivot. What You are trying to do is possible, but forming the new thin pivot must be done on lathe. Thus the wheel will get shorter, but can have new pivot without the drilling for normal standard repivoting. Then piece of brass can be soldered under the pivot hole in the bridge and new hole drilled in it to form the new bearing.  Well, this way is not the recommended one, not quite correct, but it is possible to do for the excersize... When I say lathe, lathe may be verry simple, someting like turns, but made of what one has in reach of his hands. If You want to try, I will try to guide
    • JohnR725
      Without Our Forum

      By JohnR725 · Posted

      yes by all means let's gather up our weapons tar feathers find the nearest tree in case Mark is not agreeable to our terms on our demands and storm his Castle. I don't quite understand what you're trying to do here? In other words you want Mark to somehow guarantee that the group will live on forever no matter what? You want Mark to somehow change his business model of what is trying to do or should we just take the group away from him? oh and is quite possible that Mark never realized that his discussion group would take on a life of its own. That the members of the group would like to continue on forever.  
    • RichardHarris123
      Second hand watch market.

      By RichardHarris123 · Posted

      I'm not sentimental, I see it this way.  I inherit something I  don't like, I could sell it, buy something I do like and remember the person with the new item.  For example, I  inherit a watch ( I haven't), I don't like it, I  buy a watch I do like, every time I look at the watch, I think of the person. 
×
×
  • Create New...