Escapement Testing - New Chatons
Due to the clear root cause of the variation being gear meshing, I’ve decided to implement a design change for betting tuning and easier assembly. The chatons at the rear of the movement were previously just a jewel pressed into a brass fitting pressed into the carbon structure. This has been changed to a two-piece system consisting of:
An outer brass fitting pressed into the structure, with retention screw
An inner stainless fitting free to rotate and slide until tightened on by the retention screw. An eccentric hole is drilled and into this the jewel has been pressed.
By rotating the inner fitting the depthing of the wheels on the arbor can be varied +/- .010" and by sliding it the end float can be adjusted.
The new design in center, next to the previous design. Note that the jewel is offset from center, this is the side facing the front of the clock where the arbor interfaces
The new design in center, next to the previous design. The retaining screw on the bushing can be seen, along with a cross hole in the center piece useful to help rotate it
Three instances of the new chaton design on the first, second, and third arbors
More information on NAWCC Forum post on this subject:
