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Junghans pivot hole damage

CJo

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Aug 22, 2005
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Starting on this project and I knew that this had been cracked by a previous repairer. Looked worse on the inside of the plate after disassembling. Not sure the best route to go with it. This is the pivot hole for the wheel that drives the escape wheel. I have included several pics of the same pivot hole, one with the wheel in it. Any thoughts on what to do with it?

IMG_4815.JPG IMG_4816.JPG IMG_4818.JPG IMG_4819.JPG
 

R. Croswell

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Apr 4, 2006
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Nice mess! Before repairing this, is the depthing correct as it is now? Looks like perhaps the position of the existing bushing may be off. Are you looking for an invisible repair or a functional repair? What first comes to my mind would be to mill (or file) the inside of that peninsula to about1/2 thickness and solder a flat piece of brass on the inside. Shape it to match the original profile, then drill through the remains of the bushing and ream for a new bushing with a slightly larger OD. There is not a great deal load on this part.

RC
 
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Willie X

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Feb 9, 2008
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First thing I would do would be to use the ole preacher, so you will be able to relocate that pivot point. Willie X
 
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Willie X

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A good torch guy (jeweler) can build that peninsula back up. I would make it a little bigger than it is now and loose the old bushing before commencing with the metal work. Tell him/her not to worry about the thickness,you can work down the thickness as necessary. Willie X
 
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shutterbug

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Oct 19, 2005
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I think I would remove the bushing to eliminate the pressure on the crack, the clean the part well spread the crack enough to slip in a small flattened piece of solder and solder it together. Then establish center again and rebush it. As RC said, there's not a lot of pressure on that part.
 
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