THREAD CUTTING
Definition
Threading refers to the action of creating a helical thread on a cylindrical part. This operation then allows the part to be screwed into a corresponding tapped hole. For the general concept, see Threading.
In watchmaking
Threading is performed on very small diameter parts: Movement screws, arbors, winding stems. This miniaturization requires a precision far greater than that of other mechanical fields.
Standards
Watchmaking historically uses specific threads, often noted S, distinct from the common ISO metric threads, noted M.
Tools and method
The operation is carried out on a lathe bench, with a screw plate, or freehand using a chuck and a screw plate holder. In production, it is carried out on automatic machines: screw machines or machining centers.
See also
For the description of the thread obtained, see Thread. For its role in locking screws, see Thread locker.
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