FIXING
Definition
Fixing refers to the action of fixing a part in watchmaking, to immobilize it in its final position.
Fixing the movement
A screw or a key fixes the movement in the case middle, ensuring its stability in the case. This fixing key comes into play during the assembly of the movement into its case.
Fixing the hairspring
The hairspring (balance spring) is fixed to the collet at the center and to the stud (hairspring stud) on the outside. This double fixing conditions the concentric development of the hairspring.
Importance
A poorly positioned hairspring fixing deforms its development and disrupts the isochronism of the regulating organ.
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