July 26th, 2007 - Detailed Watch Repair Notes - Part Two
…continuation of the Watch Repair Notes from Hairspring Vibrating Company.
15 - From side view observe level at which:
a) guard pin meets safety roller.
b) pallet horn meets roller jewel. See clearance between guard pin and end of roller jewel.
16 - Hold balance with pallet in dead center of banking pins. Test freedom of roller jewel in pallet horn slot.
a) Turn balance 10º beyond point where pallet hits banking pin, test freedom of pallet horn between roller jewel and banking pin.
b) Turn balance 45º from (a) (same direction); test freedom of the guard pin between safety roller and banking pin.
c) Apply (a) and (b) on both receiving and leaving sides.
17 - Lightly oil impulse face of each pallet stone. Check motion in four positions with the original winding of only five half turns which represents approximate mainspring power after 24 hours.
18 - Timing Machine. Take four position rates with the same five half turns, wind fully, checking for racing, repeat same four rates, compare for isochronism, adjust accordingly.
19 - Oil jewels. Use heavy grease between winding and clutch pinions.
20 - Check for bent minute wheel teeth.
21 - Rotate minute and intermediate wheels in each direction, observing freedom.
22 - Replace cannon pinion half way, synchronize minute wheel teeth, press pinion. Check drag, be sure that pinion does not rise on center post while being rotated.
23 - Lift hour hand. Dial washer or weight of hour wheel should return hand to original position.
24 - Lift second hand to check space between second hand post and fourth wheel jewel.
25 - Wind and set watch. Place into an envelope in stem down, stem up, dial up and dial down for approximately four hours each, recording on the envelope each position rate. Adjust accordingly. Reset and repeat four positions for longer intervals.
August 23rd, 2007 at 6:58 am
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