METHOD FOR ADJUSTING THE OSCILLATION FREQUENCY OF A BALANCE SPRING ASSEMBLY

摘要

Method for adjusting the frequency of a balance spring assembly formed at random from an entire production of springs and balances. The production means are set to limit the standard deviation (ds) of a given batch of springs to a predetermined maximum value (dsMax) and to limit the standard deviation (db) of a given batch of balances to a predetermined maximum value (dbMax) with a given imbalance tolerance. The mean (mb) of said population of balances is described according to that (ms) of the springs in order to obtain a deviation corresponding to a maximum value of decrease of inertia of the balances between the extreme values of the Gaussian distribution of the balances and that of the springs. A spring (Sx) is taken at random from said given batch of springs and a balance (By) is taken at random from said given batch of balances. The inertia of said balance (By) is adjusted according to the torque value of said spring (Sx).