The Minute Repeater watch is actually divided into two sets of systems, one for walking time and one for reporting time, and the two are completely independent. The watch does not go, just dial the slider, the Minute Repeater pocket watch can still report time. However, for the Minute Repeater watch, the travel time system is still the basis, because the time is not allowed, the time of reporting is also wrong. So the first step in the specific repair work is to make the time recover accurate.
The Movement of This Zenith Minute Repeater Pocket Watch (After Repairing)
First of all, this Zenith watch has been in operation for more than 100 years. The three-wheel axle wear is more serious and can not be repaired. Therefore, the technicians stamped the old axle and replaced the new piece. Secondly, because the pocket watch has been violent bump, the ruby bearing inside the movement has cracked, so this time also replaced the new ruby. Then, the Zenith watch did not install a shock absorber at that time. Considering that Mr. Leng used it as a daily timepiece for a long time, the technician added a balance wheel shock absorber for safety. However, in order to maintain the original appearance of the pocket watch, they deliberately adopted the invisible design, taking into account the practical and appearance. Moreover, the low-carbon steel material is used in the pocket watch spring. After more than a hundred years of operation, the metal has been fatigued, not only the total energy stored, the torque decay is fast, and the power is still insufficient. So the time of the Zenith changed the clockwork again, and the Minute Repeater pocket watch was restored to the original factory state of the power reserve for about 40 hours.
The handling of the movement balance is the most complicated part of this time-lapse system repair. The balance wheel is the core component of mechanical machinery. The slight offset and vibration will directly affect the accuracy of the timepiece. After the technician detected it, the balance wheel of the Minute Repeater pocket watch had been slightly offset. In order to restore it to the best travel time, they use five different tools to adjust the balance part.
First, the technician removes the balance shaft and places it on the “rotary lathe” and uses the “polish” to contact the continuously rotating balance shaft until the surface of it is smooth. This kind of operation is not only for the sake of beauty, but more importantly, it avoids unevenness, reduces the contact area and friction.
Then, the technician combines the balance shaft with the balance wheel and places it on the “Truing Calipers” to make sure that the two are perpendicular to each other without any slight tilt.
After that, place it on the two ruby edges of the “Poising Tool” for “static balance” processing to determine if the center of gravity of the entire balance is above the axis. Gently rock the balance wheel. If there is eccentricity, the balance wheel will swing from side to side after a few turns until it stops. At this time, its focus is at the bottom of the still position. After correcting the key points, you can use a small drill to cut a little metal on the back side of the key edge and then perform a balance check, so that it is repeated several times until the balance is balanced.
Finally, the entire balance wheel is mounted on the movement, placed on the “calibration meter”, and the eccentric direction is determined according to the error of the different orientations of the movement, and the eccentricity is eliminated.
After the time system is repaired, it is necessary to enter the timekeeping system.
Mr. Leng and His Zenith Minute Repeater Pocket Watch
After more than two months, Zenith has not only repaired the faulty travel time and Minute Repeater function, but also thoroughly cleaned and maintained the entire timepiece with more than one and a half century of professional watchmaking technology, making this pocket watch which has witnessed the two generations of time and emotional reborn.
Mr. Leng and His Zenith Watches
The goods are valuable, and the true sentiments is really priceless. When Mr. Leng found Zenith and commissioned the restoration of this antique timepiece, not only to restore the Minute Repeater pocket watch restore glory, but also to continue to retain and inherit the family affection memory carried on it. Zenith will use the “movement” to compare the heart, passing on this two-century family memory carrier for generations through its own professional skills.