Tapper, Balance-wheel Screw Hole
Overall rating: (N/A)
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Operates powered horizontal tapping machine to cut internal
threads in screw holes around periphery of watch balance wheel:
Places center hole of balance wheel over protruding pin of
machine chuck. Turns wheel to align hole with tap and persses
handle to starts tap forward into hole.
Verifies size of holes,
using precision plug guage.
Replaces worn taps.
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