Platform Escapement Course at Upton Hall Part 2

This week at Upton Hall, the main focus was to be on manipulating hairsprings so were advised to prepare mentally for the challenge ahead. Before we started we were allowed a sneak peak at the auction storage room of the BHI which was a complete treasure trove. The next auction will be online in June.

To do the tests on the hairspring we first removed it from the the balance staff and rested it on the underside of the cock with the stud in place. This was so that we could see if the collet was central to the jewel hole or not. Paul told us that if the index could be moved without affecting the placement of the collet then the problem is towards the centre of the spring whereas if the index caused movement itself, then the clearance in this area is the problem.

Checking the clearance on the index pin

The clearance was checked in the important 90 degree range, 45 degrees away from the stud and starting from the beginning of the spring close to the stud we used tweezers to adjust the position in order to have perfect clearance.

Manipulating a hairspring

Next job was to alter the spring so the collet was completely central which involved a very delicate operation, bending the spring 90 degrees away from the direction intended for the collet.

One of the hardest tasks was bending a spring that was no longer flat and I spent the longest time on this part, trying to perfect the skill!. Once done, Paul was perfectly happy to challenge us with another broken spring.

Replacing the hairspring to the staff

The platform I was working on

Once the platform is all back together we went through the most important checks in order: end shake of all components, roller shake, guard pin shake and horn shake. It is then important to test the virtual and total lock, also known as drop lock and sliding lock, for all teeth.

We wore our white coats this week so as to look professional for some photographers that came round

Overall it was a great weekend and I learnt a lot. I think the environment and the fact that you are focused on one subject for a few days really helped my confidence in dealing with platforms and watches. I definitely recommend the course and the tutor Paul Shrouder.