Bumper movement banking stop springs

Posts

1,429

Likes

1,944

Rasputin

·Dec 25, 2018

I understand that the cal 330 bumper has stop springs located on the center bridge to help cushion the rotor as it rotates. I have a Seamaster cal 2757 that utilizes a cal 355 bumper movement that sounds as if it makes a hard stop on the center bridge. However, unlike the 330 I see no spot for stop springs to attach on the bridge. Did the 355 not use stop springs and hence the hard stop or am I missing something here?

 

Posts

4,563

Likes

9,334

Bill Sohne

·Dec 25, 2018·Bill @ ΩF

Hi

I dont have material sheet handy , need to look around ..but the 355 has hidden/ covered stop springs...
EDIT
ok I found them

bill

Edited: Dec 25, 2018

 

Posts

3,892

Likes

6,607

Vercingetorix

·Dec 25, 2018·Spam Risk

http://www.ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&0&2uswk&Omega_330
http://www.ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&0&2uswk&Omega_355

The 355 springs are hidden.

 

Posts

1,429

Likes

1,944

Rasputin

·Dec 25, 2018

Thanks @Bill Sohne and @Vercingetorix. I assume they are hidden under the center bridge? Unfortunately I have a blurry material sheet and thus unable to tell what part number these 355 stop springs are.

edit: part 332-1415👍

Edited: Dec 25, 2018

 

Posts

4,563

Likes

9,334

Bill Sohne

·Dec 25, 2018·Bill @ ΩF

hi

332.1415

You can click on the images to zoom in....

Best
Bill

 

Posts

15,340

Likes

45,177

Canuck

·Dec 25, 2018

Bridge 1013 in the parts list above sits on top of bridge 1009, and is held in place with screws. There are two “box” shaped coiled compression springs (part number 1415), one of each that fit into each of the two rectangular slots in bridge 1009. Those are the bumper springs that stop the rotor at the ends of its swing. When the watch is all together, you may not easily see those springs. But especially if they are not there. 😀

 

Posts

1,521

Likes

4,777

michael e

·Dec 26, 2018

For future reference.

 

Posts

1,531

Likes

1,087

François Pépin

·Dec 26, 2018

The movement on the right looks like a 28.10 RA SC - like the 350. On this movement the springs are not hidden.