Need Help on Repairng & Service of my Seiko 7S26 Movement at Home.

Recently Browsing
No registered users viewing this page.

Topics

Posts

By AlexanderToerzs · Posted
Dear all, my mother gave me a Swiss pocket watch made by Robert, Gerth & Cie in 1889. It belonged to my greatgreatgrandfather. Wonderful watch  already with a Swiss lever escapement. Unfortunately someone in the past has taken out the the two wheels of the Geneva stop work in the mainspring barrel lid. The distance between the centers of the wheels are 4 mm. I know that it is highly unlikely to find a scrapper movement with exactly the same dimensions for the maltese cross and the finger. However I found an bought a cardboard box on ebay UK with about 100 antique mainspring barrels. And indeed in one of the barrels I found a stop work with exactly 4 mm center to center. A fellow named Jules Grossmann from LeLocle in Switzerland wrote a treatise on watchmaking in 1905 called Lessons in Horology. In there he describes the mathematical construction of the Geneva stop work. If you follow his instructions you can very easily make a drawing. To cut a long story short. All the dimensions fit the wheels I have sourced almost perfectly (give or take a few 1/100th). Now to the problem: The hole in the maltese cross is too small for the seat on the barrel lid. However this can be easily fixed in the lathe. The square hole of the finger wheel (1.3 mm) is too large for the square on the barrel arbour (1.0 mm). Since I am only an amateur I have absolutely no idea how to go from here. What would a watchmaker proper do? Thanks and all the best from Hamburg, Alex 2020_sept_r_g_cie_federhaus_federhausbruecke.bmp 
I hold the hand with a drop of Rodico on the end of whatever is handy at the moment...

Welcome! Just read around a bit and you'll discover all the parts suppliers.

Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.