Junghans 653 Durowe 7526/2 (INT) - Movement Stopping
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By Neverenoughwatches · Posted
Absolutely, i cant see that would even work, maybe release a coil or two at best. -
Well, an off center hairspring collet is not the issue. So, I'm left trying the old mainspring in it. -
By RichardHarris123 · Posted
Maybe one of the largest understatements I've ever heard. -
I haven't found the lift angle for the Benrus BA movement. I did find 51 degrees being the lift angle for several other Benrus movements, so I have tried that. Not much of a difference in amplitude reading from 52 degrees, of course. I'll attempt to center up the hairspring collet and tweak the position of the regulating pin and retest. Trying the old mainspring is certainly an option, but it is quite coned. Plating was worn off of the barrel lid, so this wasn't from me removing the mainspring.
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By nickelsilver · Posted
The barrel may have been roughed out, then later machined for the lid (for example). That would open the possibility of the lid mating surface not being perfectly concentric with the barrel hole. A lid would be fabricated, fit to the barrel, then the barrel centered up in the lathe, lid fit, and hole bored. They had techniques to center up stuff really well, but it's time consuming so they might cut corners on lower end stuff, or if there was a way to make a certain eccentricity a non-issue. Some books show boring the mounted cap and barrel in the same operation.
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