minidriver said:...The size of the balance wheel was increased to provide the torque required, as the hands are heavier than a dress watch. ...
I agree. The only source of energy in the movement is the mainspring. If more torque is required to drive the hands, you would need to use a mainspring with a higher spring constant. I'm not a watch maker, and I'm not questioning the accuracy of what was written by our esteemed watchmakers. I'm just looking for some clarification on how a larger (or more massive) balance wheel is needed when heavier hands are used.Axel66 said:Interesting Reading!
I just cannot get this part:In my understanding the balance wheel has nothing to contribute to the torque. To increase the torque you should rather modify the main spring.
What is wrong with my thinking?
But anyway it's hard (for me) to believe that a modification like that should be made just because of increased mass of the hands, but I'm more than willing to learn more about it.