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By HectorLooi · Posted
I repaired one of the rechargeable spot welders for my mentor a couple of years ago. It used a flat, 12V lead acid cell, like those found in uninterruptible power supplies. I was surprised that at the maximum setting, it was more powerful than my dental tabletop unit. The only problem with these spot welders is the power supply. The battery is so small that it is easy to overcharge it and cause sulphation. And if not charged regularly, it would go dead and short out. -
By Neverenoughwatches · Posted
What cal is it Mike, i think i have some longines staffs, i can have a look though later today to see what i have, might get lucky. If you have dimensions of it as well. -
By Neverenoughwatches · Posted
Thanks nickelsilver I thought it might be a tricky job, but now that you've made it sound so...🤔...well riveting i guess, that i just have to try it 🙂 I have these i forgot about , making life a bit easier. -
Good point Rich. My Longines I just serviced had this exact problem - years of running with no lubrication. It definitely needs a new balance (and possibly jewels)
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By nickelsilver · Posted
Spot welding is the best, and is how Generale Ressorts does it. Rivetting is good, but it's an absolute bear getting the holes in the spring and tongue, centered in the spring, then making a rivet that fits well while being as low profile as possible and actually holding up to use. I would by far rather make a balance staff than rivet a tongue on a mainspring. There are a number of spot welders aimed at watchmaking on Aliexpress, I've been meaning to get one. They can do dial foot soldering (using a carbon rod) and spot welding.
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