2240 Chinese (I think) Stem Removal Help
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By nevenbekriev · Posted
Balance-hairspring system is oscillator with big Q-factor. When all in the movement is OK, the rate (frequency) is verry close to the oqn resonant frequency of the balance-hairspring. But in some cases, the movement (with foult) will force the resonator to work on pritty different frequency, fometimes faster, and sometimes slower. When this happens, the amplitude is always weak. So, the first thing to ask is what is the amplitude. If it is more than 180 and the hairspring doesn't touch itself and anything else, then for sure it is 'short'. If the amplitude is weak, then the first thing to do is to understand why and rectify the problem. At this time no point to check timekeeping. But, if one doubts that the hairspring is not correct, then He needs to calcullate the rate of the movement, then to 'vibrate' the balance-hairspring out of the movement and to measure the free oscillations frequency (period) with timer in order to ensure that they comply with the rate. If we have pictures, then it will be easier to tell something about that wheel. -
So much work has gone into this! Thanks again @Jon. I will go back and check my adjustments from last weekend. A few questions for you, if you don't mind. In the reset position, I can understand the problem if the gap between the hammer and the minute counter heart is too big (slide 77) but what is bad about both hammers being in contact with the cams (slide 76)? I read somewhere that Landeron recommended grease on the runner cam, but the minute counter heart should be dry. Is that so, and why? How many tads in a ligne? -
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By RichardHarris123 · Posted
Could you glue two pieces together for rigidity and separate after forming? -
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