Most visitors online was 1660 , on 12 Dec 2020
FrankI have to change the mentioned balance staff (1st time this type). It looks like it is a simple straight or tapered staff. The balance spoke has a riveted brass sleeve that contains the staff.
View attachment 536695 View attachment 536696 View attachment 536697
How should I remove the old staff. If tapered, in which direction?
Thanks for help,
Based on the third photo, it appears that the staff could have only been installed from the bottom of the balance. I would remove the roller and drive out from the top of the balance down. I would also dimension the brass sleeve first, in case something really strange happens. It can then be easily remade.
thank you for being engaged in my problem and for your hints!
After posting I found that exactly my question had already been answered in 2015 here.
Both of you advised to push the staff to the bottom. My measurement however showed a staff diameter of 0.56 at the upper end of the brass sleeve and 0.55 at the lower end. Assuming a straight tapered staff I was tempted to push it to the top, but no movement.
Eventually I could remove the staff to the bottom.
View attachment 536947
A strange double tapered staff appeared: the part in the brass sleeve was roughly square shaped.
View attachment 536949
In advance I had removed the roller that came loose with a nasty frightening cracking noise, but there was no damage in any way.
View attachment 536948
Hours later this work was finished.
View attachment 536950
yes I made a new staff.
0.11 mm pivots are beyond my drilling possibilities, my limit is 0.20.
I know that micro drilling is one of your favorite topics and I like your postings and amazing ideas.
Recently I had to replace twice the pallet staffs of PWs as above. One got the pivot drilled, the other staff was turned. I found the drilling not so much faster than the other method. With all the involved extra work amazingly it always takes twice the time that I expected before.