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English PW roller jewel

CJo

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Aug 22, 2005
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I was watching a watch repair video. It said that the roller jewel needed to be perpendicular to the cross bars at all times. Is this true in all situations. I'm new to watch repair and have a lot to learn. Your input is much appreciated. Thanks
 

doug sinclair

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"Cross bars"? By that you mean? Perhaps you mean the balance wheel arms? If so, then it isn't absolutely critical the roller jewel be perpendicular, but it should be close.
 

Smudgy

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There are some watches that the roller jewel should be set at other angles. Off-hand I can't recall which they are. The different angle makes it easier to make adjustments (it is almost impossible to see otherwise an the several that I worked on).
 

CJo

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What I'm working on is a size 12 Elgin. The roller jewel is not perpendicular, and wondered if I needed to move it and how.
 

doug sinclair

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Moving a roller jewel should be done by gently heating the roller table to soften the shellac that holds the jewel, and adjusting the jewel before the shellac hardens. This can be done by using a pallet warming stove, or by using a pair of old broken tweezers which you have heated to red hot at the tip.
 

CJo

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Lost internet service, so hadn't been able to reply.
I guess what I need, is to move the roller table to the correct position. I have found in all my books no info on how this is best accomplished and as I said, I am very new at all this. Your input is greatly appreciated.
 

gmorse

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Hi CJo,

As Doug mentioned earlier, it isn't absolutely critical that the impulse jewel is precisely at 90 degrees to the crossings; this by itself won't stop the watch from working. Perhaps you could explain why you want to move it? What are the symptoms?

Regards,

Graham
 

CJo

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The balance when placed in the watch, will wobble, and not stay running. I placed another balance in the watch that had the roller table perpendicular to the cross bars and the watch runs perfectly.
 

gmorse

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Hi CJo,

I think you've just answered your question! Just because another balance works which happens to have the roller in a different orientation, doesn't necessarily mean that that's the reason; you probably have a broken balance staff pivot which is resulting in the wobble effect. A replacement staff is the only answer if this proves to be the case. Also, if the pivot is broken there's a distinct chance that the jewels at that end are damaged as well.

Regards,

Graham
 

topspy

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Also, beware the prior repair! I had one a while back that would run, but only face down. Turned out that someone had mounted the hairspring and roller on the wrong sides of the staff, and put the balance in upside down! They had reamed out the roller to make it fit....

You could have a balance with a staff that is too short or undersized pivots ( if you find that a pivot isn't broken.) Also check that the escapement is 'in beat.' You can approximate this by noting that the roller jewel is between the banking pins while at rest. To do this let down the mainspring, remove the balance and then the pallet fork, install the balance and see where the roller jewel sits. Adjust by turning the hairspring collet on the staff with a small screwdriver in the slot of the hairspring collet.....

But first you must determine the cause of the wobble!
 

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