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By nickelsilver · Posted
I've seen some really nice early 20th century pieces where all the jewels, including center wheel, were convex. Definitely to reduce friction. It can be quite hard to tell if a jewel has olive holes, especially on small sizes, but that again reduces friction- as well as accommodates small misalignments better. Why they aren't used more often? I imagine it was found that at a certain point in the train the actual advantage became negligible, and the added cost on high production movements is why it's not seen on those, just higher-end pieces. I did an experiment on a little 5x7"' AS 1012 a few years back. These things run OK sometimes, but often are absolute dogs. And AS made gajillions of them. I had a NOS novelty watch in for a service, ran OK flat, massive drop in amplitude vertical. Made like 3 staffs for it trying different pivot sizes, no change. Tried high quality (not Seitz) convex/olive jewels, no change- the original were flat, but could have been olive hole. Same for the pallet fork, then escape wheel, no change. Probably had 20 hours in the watch, new staff and new hole jewels through the escape wheel, no difference in running. Just a dog of a movement. But if I were making a watch I would use them, just because. -
By Neverenoughwatches · Posted
When Nicklesilver mentioned the use of them on non coned pivots on older high end watches closer to the escapement. That suggested to me probably fourth wheels and possibly third wheels. The square shoulder rotatating on the much smaller surface area of a dome as opposed to a flat jewel surface. I'm curious as to why they are not used predominantly? -
That's what I thought, but as I said, it makes sense. See if any of our pros will have something to add. -
By Neverenoughwatches · Posted
Kind of guessing here watchie with a bit of logic. -
By rossjackson01 · Posted
Canon with FE 4612a movement. Day and Date display Trying something new. Although is will take some time for me to start, I have a back injury that is very painful and so cannot concentrate. Set myself a target to begin mid May. Purchased a Canon wrist watch with FE 4612a movement. Advertised with Rotor missing. Arrived, took photographs. Strap broken, removed and place in bin. Back removed. No rotor. Wind is stiff. Can wind up. Everything moves ok. Oscillates for under a minute, then stops. No rotor but all wheels appear the be there. Have sent for a donor movement FE4612. No day wheel. I have taken basic photographs up to the point of service commencement. I will try a new format and use the record system on the microscope to show the full disassembly subsequent assembly. I will photograph the cleaning process. Whilst I have no intention beginning a YouTube channel, I would like to begin to make a better record of my work standard. Work to do. Make case to a better standard. Repair crystal. Replace strap. Only a thought. I will try to insert an English day wheel. Not sure if it can be done, but hey, what can I lose. Got to stop now, back so sore.
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