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Roamer MST522


TheFixer

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    • Welcome to the forum Jeff, enjoy.
    • No, the Peseux 7040 is doing very well as far as the rate (and amplitude) is concerned. The maximum delta measured was 20 seconds between fully wound, crown down (+8 s/d) and fully wound minus 24 hours, crown up (-12 s/d). Compare that to the ETA 2763 having a delta of over 80 seconds. What I was trying to convey was that I observed that the much higher amplitude of the Peseux movement during a 12-minute measuring period could momentarily fluctuate by 30° just like the much lower amplitude on the ETA 2763. I haven't studied the History graph on @praezis PCTM software for any other than these two movements but I wouldn't be surprised to learn that these fluctuations in amplitude during a 12-minute measuring period are the rule rather than the exception for all typical non-high-end-chronometer movements.
    • I'm presently using a cheap supermarket ultrasonic cleaner, with L&R #111 cleaner and #3 rinse solutions. I cut a bit off the bottom of an appropriate size plastic sports drink bottle, which is a perfect fit around the mesh basket I use (~65mm diameter). That allows me to use mostly water in the machine tub and cleaner or rinse only in the small plastic container. I keep the solutions that are still fit for use in small glass jam jars. I use the cleaner then two rinses, then the mesh basket balances on my bathroom radiator (once it stops dripping) to dry the parts with moderate warmth. Prior to that I tried just lighter fluid (eg. generic zippo fluid) and just soaking / swirling parts in the glass jars, but the movements did not run at all well afterwards, they were still acting gummed up. The proper solutions make a world of difference & the watches now work as they should!    
    • Have to agree with you. Will not do another. Did not enjoy the time spent. However, it was worth it to know that I understood how to disassemble, look for defects, repair and then assemble. Timegrapher? No facility to alter anything other than the stud. Everything is metal to metal.
    • Couple of things H. There surely seems to be a reoccurring fluctuation pattern  of somewhere around every 5 minutes. More noticable with your crown left trace having a large peak gradually reducing to 2 small peaks and troughs then back up to another large peak. Nev posted a download link to a book by Harold Kelly not so long back that i started to read while i was away. There was a good section on wheel and pinion ratios, rotation periods of wheels of different beat frequencies that's worth a read. Then something that bugs me comparing the amplitude and timing rate changes with your dial up trace which i chose to avoid wheel imbalances . The amplitude fluctuates by an extreme of 30 ° and the rate fluctuates by an extreme of 21 seconds as per your reading. In normal circumstances a movement dropping its power over the course of the mainspring unwinding, a hairspring acting isochronical will maintain its rate almost to the end of the power reserve. Similarly power wound into a movement increasing its amplitude from 265° to 295° a hairspring again acting isochronical will again maintain its rate aside from a brief few moments until it settles into it's rate. From that it seems to me that because the amplitude difference isn't big enough to affect a rate change then the amplitude fluctuation cause is not coming from anywhere but from the balance. So its whatever is causing the rate to change increase and decrease within the balance is also slowing and speeding up the hairspring swings. I'm not quite sure if I've just gone around in circles with that, it made sense to me when i started  😅 We did have a discussion a while back when i asked if rate could come from that point as well as from the regulator pins. This area can be electro stiffened in high grade hs i remember was the answer. I remember that over Ross's issue with balance endshake.
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