Aside from making a bushing and stopwork finger for the GP movement I had to create the whole Geneva stopwork for the other movement! Heres a few photos of the raw parts before they were filed to fit and heat treated.
Here is the cross being parted off after the slots have been milled
The finger of the stopwork about to be milled on the jig borer
the two parts on the barrel cover hot off the jig borer
put simply this system restricts the barrel from letting out the mainspring on its first and final rotations. What that means the power going to the watch is consistant and uniform because the barrel is only using the middle rotations which are under the same strain.While improving the precision of the watch this feature also prevents the user from overwinding the watch.
