AS 340 problem

[rogart63]

Have a AS340 that is giving me more work then ever before. It's a jump hour complication so has some extra parts added to it. Has three small dials on the dial side instead of one. But that is not the main problem. The movement was very worn and i had to take parts from other AS340 movement to get it to run. But having problem with the a new pallet fork and old balance. Bought a new from cousinsuk.  They don't work together. When insert old pallet it works. But that pallet is not perfect and a little worn. Had three old movement but parts aren't interchangeble like they are today. Is that how movement was in the old days? 

[bsoderling]

I checked Ranfft for info on AS340 and noted there were 5 VERY different bridge designs on display! And even if people tell me they should be functionally identical, it’s hard to not start thinking that small variations in the geometry may have sneaked in over time and revisions.


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[rogart63]

8 hours ago, bsoderling said:

I checked Ranfft for info on AS340 and noted there were 5 VERY different bridge designs on display! And even if people tell me they should be functionally identical, it’s hard to not start thinking that small variations in the geometry may have sneaked in over time and revisions.


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There is a lot of different bridge design on this early movements. What is strange is that new pallet fork won't work in the old movement.