Landeron 48 help!
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My apologies if I'm still getting the terminology wrong. I'm trying to differentiate between the flat jewel with no hole, and the one beneath it with a hole. The pivot goes through the latter, obviously, and then abuts the former. Any recommendations on how to measure the desired 0.15mm without a micrometer? I think there are a few big takeaways for me at this point: Pivots really need to match their corresponding jewel holes to within some small tolerance. Too small is bad and so is too big. Jewel variation is a real thing...you can't go based off specs, especially if your jewels have been replaced (possibly with the wrong ones) Measurement tools for pivots are very expensive (e.g., Seitz jewel gauges). Based on some additional outside reading, it seems like the use of micrometers to measure pivots is discouraged because it's too easy to cause damage. Plus, bench micrometers are too expensive anyway. BOTTOM LINE: Test the pivots in the actual jewels in which they're supposed to be seated How well would the following work: Mount the pivot vertically in some pith wood in the same orientation it would have looking top down on the balance cock Put the hole jewel on top of the pivot and check to see if (1) it fits on the pivot easily and (2) the pivot is sticking out the top an adequate amount so that it will abut the cap stone (0.15mm?) If the above are true, and the pivot also fits in the bottom jewel, then I could safely mount the staff in the balance wheel, without mainspring, attach the balance, then test to see how freely the wheel spins. Is that a workable plan? Also, as an aside, assuming I would use Moebius 9010 as a lubricant for these particular jewels? -
By nevenbekriev · Posted
Ok, several things more. There is no difference between cap stone and end stone. They are two names for one thing. The thing is the stone with no hole, with one flat polished side. You for sure must remove the jewel settings from the cock. Otherwise no way to check what is needed to check. You don't need micrometer. Probably newer will need one. At this point, You need to check if the pivot can get in the pivot hole of the hole jewel in a manner that the pivot top is at least 0.15 mm above the upper surface of the stone. No matter if it is the old staff or the new one. -
By RichardHarris123 · Posted
We know AI doesn't understand anything but we don't know if or when it will do. 3 months, 3 years, 30 years, 300 years or never? -
COBOL as well, know a couple of folks who work 4-6 months of the year and earn 6 figures working with it. Tom -
There is a certain irony in the fact that knowledge of Fortran is still in use in some niche areas (mainly banking and finance) to this day. Maybe I'll ask Chatgpt to write me some Fortran 77 code, just for fun. Speaking of AI and time (wasting), you might find this interesting. https://hackaday.com/2025/02/06/a-great-use-for-ai-wasting-scammers-time/
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