Watch running string Once the watch's balance wheel and escapement fork removed, and then winding the transmission train no obstacles, will produce high-speed rotation, this is called "running string." Because the wheel is the driving wheel, the wheel shaft driven, so a few gear superposition down to the last level of the escape wheel, running speed is very high, especially in the winding near full strings, but also issued a " Creak "sound, a long time to do high-speed running string can also cause rapid wear and tear on the gear shaft tenon. Running in the watch assembly and repair, the main purpose is to check whether the axle into the shaft eye is reliable, the gear alignment and meshing state, the eye shaft lubrication, gear beating, gear axial radial clearance, wheel and axle Sharp concentricity, the sensitivity of the gear train, etc., which can be observed in a short period of time by running strings. Dial gear surface assembly, but also includes calendar, calendar and other additional instructions related to the gear, they are relatively slow speed, by running the same can be faster to check its working status is reliable. Running string should be carried out under the weak moment of the spring, and all the added oil must be finished betting. There is a saying: When the running process is over, if the escapement wheel or second round of a certain amount of maneuver, it shows that the transmission system is good; I personally think that there is no rotation of the second round, or to sub-heart structure, usually partial center Transmission, and a large barrel male table machine heart prone to maneuver, it is because the barrel wheel in the running process, have a inertia, when the winding net string, it continues to rush forward, resulting in winding Core reverse deformation, this will lead to a slight rebound moment. The most important thing is that as long as a little string to a little spring, the transmission gear train began to rotate, this action can maintain at least the center wheel (two) can rotate for a week, non-stop running chord constantly gently winding; The running chord, even though it is normally good, does not represent the movement of the movement after assembly, since the radial clearance of all gear trains is changed once the clockwork is full, especially the barrel wheels and The second round, the more close to the driving force, the greater the pressure on the shaft and stem. Such a running string can also check the reliability of the clockwork changeover mechanism at a low energy. It takes quite a lot of man-hours to change hands. Running string is also divided into two situations: (1) pure state of mind, (2) movement has been fitted with a needle, and was assembled into the case. The second state is more important, because many watches are only in the case, close the back cover only when the problem occurs, the typical reason is the movement of the table hole on the case handle the first tube is not the same heart, as well as the movement Under some pressure, the splint is pressed and the clearance of the part is lost. In particular, pay attention to run the string to find whether there is a cyclical cyclical block, speed changes, suddenly flipping or even Caton phenomenon, according to the gear ratio or their respective rotation period, to determine the possible problems Where the location, this is the purpose of doing running. Assembly problems can also be run through the strings to check, in particular, the gap between the needles, hands and dials or other signs when the dial gap, the second hand and the gap between the glass and so on. For example, a watch found in the running chord and the second hand always stopped at the dial position 35-45, the table slightly curved glass, the watch is relatively thin, indicating that the tip of the second hand has scratched the inside of the watch glass, Severe shocks and vibrations can distort the second hand, especially the thin, long, second hand. The hands are mounted on their respective needle shafts. The verticality and radial clearance of the wheel can be clearly reflected by the height of the needle tip. The greater the pointer length is, the more it seems to be an amplifier, an old watch wheel axle and a corresponding drill hole There will be wear, especially in the center of the wheel eye position, the performance of all indicators in the dial 3-6-9-12 a few positions away from the dial height differences, there will be second-hand thin glass watch rub the glass situation. To know the micro and see, is the truth.