Elma Watch Cleaning Machine
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Hello again, I meant to say the movement above was in a Chronosport Atlantis 20 ATM on eBay and wondered if you had the same movement in your watch, all the other Chronosport watches had auto-matic movements....
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By Neverenoughwatches · Posted
Also been looking at the same ones as Tom 0.1.- 1mm around 55 quid inc shipping. The pivot straightner i have runs from 0.07 - 0.15 in increments of 25 microns. I guess you could use a balance staff of sizes under 0.1 to make up the remainder of the lower sizes. -
By Neverenoughwatches · Posted
I have always had it in my mind that hairsprings can fatigue in just the same way as mainsprings can. If a hairspring has gone through a rough process of repair then its structure will have changed ( bending any metal backwards and forwards will cause micro fractures and eventually breakage ) in those areas of heavy manipulation. Its strength and elasticity is no longer linear over its full length so no longer isochronical. -
By nevenbekriev · Posted
This seems to be complicated case... We have many variables here and we need to exclude some of them to make some progress. We have plots that show amplitude variations, but we don't know if this variations are significant, as they can be 'amplified' or 'smoothed' by the software. So, some observation of the amplitude by eye will be of help. Then, if we really have not isochronical work, then the main reason for this would be the hairspring being not 'linear'. And not linear may be sometimes not only because 'touching', but because bad hairsping material structure. Some of the advanced watchmakers claim that repairing badly bent hairspring is useless, because this springs will never be isochronic again. Well, my own observations are that such thing happens, but not in all the cases and it depends on the case if the result is acceptable or not. I will not suppose here that this spring has been repaired, but it has some strange behavior watching at it's work. It will be good if it is possible to test the movement with another balance or thest the balance on another movement... -
The more common Jewel hole diameters are from about 0.07mm to 0.50mm. Those are the sizes in the Seitz jewel gauge tool.
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