Question about regulating an ST2130

[Bill2024]

Hi all,

I haven’t done anything to this movement since I got it so not sure of the status of oiling. However I put it into a watch for a bit of practice and thought I’d have a go at regulating it. Before I touched it it was showing about 14 seconds fast per day. I have moved the regulator screw to the point where the watch is now around 3 seconds a day. I guess that’s pretty good however it does not seem possible to make the watch run any slower. If I continue to turn the screw past where it is in the picture, the timing starts to speed up again. 

Is this to be expected?  I guess I thought that you should be able to regulate between running fast and slow to find the sweet spot.

thanks, Bill

[Knebo]

2 hours ago, Bill2024 said:

Hi all,

I haven’t done anything to this movement since I got it so not sure of the status of oiling. However I put it into a watch for a bit of practice and thought I’d have a go at regulating it. Before I touched it it was showing about 14 seconds fast per day. I have moved the regulator screw to the point where the watch is now around 3 seconds a day. I guess that’s pretty good however it does not seem possible to make the watch run any slower. If I continue to turn the screw past where it is in the picture, the timing starts to speed up again. 

Is this to be expected?  I guess I thought that you should be able to regulate between running fast and slow to find the sweet spot.

thanks, Bill

Yes that's to be expected. The eccentric screw is only for fine regulation. Maybe +/- 10 seconds or so. For bigger margins, you carefully need to move the regulator arm.

So first, move the fine regulation screw to the neutral position. The use the regulator arm until you you're within, let's say, +/- 5sec.. Then use the fine regulation screw again. 

It looks, however, as if your regulator arm is hidden under the automatic bridge... 

 

[Bill2024]

43 minutes ago, Knebo said:

Yes that's to be expected. The eccentric screw is only for fine regulation. Maybe +/- 10 seconds or so. For bigger margins, you carefully need to move the regulator arm.

So first, move the fine regulation screw to the neutral position. The use the regulator arm until you you're within, let's say, +/- 5sec.. Then use the fine regulation screw again. 

It looks, however, as if your regulator arm is hidden under the automatic bridge... 

 

Thank you so much - I hadn’t worked out that there was the ability for both coarse and fine adjustment of the rate

I’ll take a look. 

Edited December 22, 2024 by Bill2024

[VWatchie]

4 hours ago, Knebo said:

It looks, however, as if your regulator arm is hidden under the automatic bridge...

Yes, as far as I remember the automatic bridge will have to be removed before you can reach the regulator arm.