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       CODE: 715.381-058 Buy the DOT:Download/CD-ROM
TITLE(s): HAIRSPRING TRUER (clock & watch)
Examines and adjusts hairspring assemblies to ensure horizontal and circular alignment of
hairspring, using truing II calipers, loupe, and watchmaker's tools: Mounts hairspring and
balance wheel assembly between jaws of truing calipers. Turns wheel of caliper and examines spring
to determine if center coils appear as perfect circles, using loupe. Bends inner coil of spring away
from or toward collet to locate center of collet in center of spring and to correct errors resulting
from faulty colleting of coil, using tweezers. Estimates space between collet and first inner coil
to determine if space is within acceptable limits, and bends coil to correct errors, using tweezers.
Examines plane of hairspring to determine if coils are parallel to plane of collet and raises or
lowers individual coils to correct discrepancies, using tweezers.
GOE: 06.01.04 STRENGTH: S GED: R3 M2 L2 SVP: 6 DLU: 77
ONET CROSSWALK: 83002C Precision Devices Inspectors and Testers
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