Fitting Center Seconds Hand on NH36
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By Neverenoughwatches · Posted
I think we've talked about this before, using a new mainspring to initially overcome the effects of more movement friction than there should be. The aim is to reduce all going friction not to push through the friction with more torque, that in the long run will create more wear. -
Sensible precautions @rjenkinsgb. I remember as a lad, my mate's dad ran a garage. I can clearly remember watching him change break pads. He used an airline to blow the dust out, (when pads used asbestos), and we used to practically bathe in "carbon tet". But then he did smoke about 40 cigs a day. Makes me shudder to think about it. -
By nevenbekriev · Posted
OK, a little bit more from today's lecture about the main springs. Generally, the spring in the barrel is limited and can't unwind fully. With the blue line is shown the reserve/torque relation when spring unwinding is limited by the barrel. The green line represents the same when the spring is free to unwind fully And the red line shows the minimum torque that is needed for the movement to keep running. The yelow graph shows how the torque changes (from the blue) when the spring gets weaker (set) after 100 years of work. The purple line represents thinner and longer spring in the same barrel. As You can see, using thinner and longer spring will increase the power reserve. The 'set' spring will have the same reserve as a new one with the same sizes, only the amplitude will be just a little smaller. Of course, this is true only when the movement othervice is in good health ( the red line is lo enough)
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