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Longines 12,68 balance wheel wobble

rogart63

By rogart63
in Watch Repairs Help & Advice

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rogart63 Distinguished Member

rogart63

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Anyone have a video or a tutorial how to straighten a balance wheel. Would like to learn how to do it. Have search but can't find anything. 

oldhippy Distinguished Member

oldhippy

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There are videos on Youtube on how to poise a watch balance. I cannot find a video on how to straighten a balance wheel. It depends what the balance is made off, some are so brittle they cannot be straightened and just break, many just crack. Have you tried to buy a replacement? or is it obsolete. 

rogart63 Distinguished Member

rogart63

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1 hour ago, oldhippy said:

There are videos on Youtube on how to poise a watch balance. I cannot find a video on how to straighten a balance wheel. It depends what the balance is made off, some are so brittle they cannot be straightened and just break, many just crack. Have you tried to buy a replacement? or is it obsolete. 

Seen them to. But's was the use to have a balance tool like this if you can't straighten it.  At least a little.  I guess if you do it in the tool the pivots will bend or break. Btw i bought this old tool  this yesterday. Had a wobbly Enicar/AR balance yesterday. Okay it worked but would have been great to fix some of the wooble. 

 290013518_046859ab-6295-430e-a254-590aedf7ab8c.jpg.ea4cc4cc06f806f0562b09393c321d4d.jpg

Edited by rogart63
nickelsilver Distinguished Member

nickelsilver

Posted
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The tool should be made in a way that it supports the staff on the conical area not the pivots. There are oddball variations. Supported on that area you can use a surprising amount of force on the rim of the balance. Fried's book and others cover it well, I'm sure DeCarle, Chicago or Bulova school texts, it's a common procedure.

rodabod Distinguished Member

rodabod

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I have that book, but maybe I have an earlier version as truing balance wheels is not in it. Those pages look excellent.

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    • Simeon
      Wheel 'height'?

      By Simeon · Posted

      That's just it. I am actually looking to see if I can replace the second wheel on a Omega 3220 which uses the ETA 2892-A2 as it's base. The 3220 actually has a push fit chronograph driving wheel on the pivot rather than a second hand. Not certain that this would be a direct replacement but it could be worth a shot versus paying $150AUD for the Omega part. 
    • Simeon
      Balance Staff replacement methodology

      By Simeon · Posted

      Yes, being lathe deprived is a problem that I have, so obviously interested in solutions that don't require one.  The Balance Staff removers are interesting. I wasn't sure if you could get them in a size to suit a typical wristwatch movement, I thought they were more suited for pocket watch balances.  I was surprised to see a staff just pushed out with a Horia tool but I guess if you get a very close fitting stump it would potentially do the same amount of damage as a remover (the only difference being that the remover seems to clamp down the cross arms of the balance immediately surrounding the staff). I did read somewhere that Rolex (who apparently recommend this) balance wheels are harder than others. This is maybe one to try on already scrap balance. 
    • AndyGSi
      Wheel 'height'?

      By AndyGSi · Posted

      Can you confirm the movement number you're working on.
    • Simeon
      Wheel 'height'?

      By Simeon · Posted

      Just checking terminology here. When a pivot is described as having a certain height is that measured from pivot tip to pivot tip or from the face of the wheel to the tip of the extended pivot? I have a bit of a strange one that measures closer from tip to tip but not from the wheel face to tip (I get 3.1mm from face to tip and about 3.6mm tip to tip when badly measured with my Vernier calipers)          
    • mikepilk
      Balance Staff replacement methodology

      By mikepilk · Posted

      This is the best option - if you have a lathe.  For those of us without, I use a Balance Staff Remover as shown in your pic. Using this, I have not seen any damage to a balance.  Rolex recommend just pushing it out as their balance arms are quite hard. But, as @Klassiker suggests, do a search of the forum and you will find plenty of discussion.
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