Pugwash said:
OldeCrow said:
Well I went looking for the most complicated mechanical failure I could invent but it sounds like it’s really a materials failure.
So, no
design fault at all? Excellent. I've changed my opinion.
Enzo, as usual, you educated me. Today I'm a little bit smarter, thanks.
hehe me too!
I'll tell ya how I came to the conclusion that it was a design fault of some kind...
I got a Swiss movement pam with the pam style bridges that wouldn't wind properly.
You could wind it untill you got to a certain amount of resistance in the main spring and then something would slip, you could hear it slip and watch the ratchet wheel and crown wheel (the two big gears on the back of the watch) roll back and stop against the click stop when it did this.
I opened the watch and discovered that one of the screws on the barrel bridge( the plate that the two big gears rest in) had come loose so the entire plate along with everything attached to it was lifting away from the front plate of the movement which includes the gear in the keyless works so it was slipping when it seperated. I tightened the screws back down and no more problem, a perfectly running Swiss movement again.
The next movement I got was a CN unitas pam with the pam style bridges and it appeared to have the same problem as the Swiss one I had just fixed. Except when I opened it up the screws were all nice and tight but it was still slipping :shock: Ok if the CN unitas had been the first one I had worked on I probably would have looked at the springs in the keyless works but when I got to the CN unitas second I imagined all the ways that the manufacturing process could get screwed up and create this problem... my bad the simplest explanation is always true.
The good news is if the swiss parts will replace the bad CN parts they are only a dollar or so which is still cheaper than replacing the whole CN movement. By the time you pay someone to fix it a movement swap is probably still cheaper though