August 25, 2015, 18:25
Patrick WallinBalance wheel Weight
I have a balance wheel & staff from a Wheeler which weighs in at 9.14 g.
I also have a Elgin, 18s 15j, grade 142 which weighs in at 9.36 g, a 22 g difference.
What sort of change would the lighter combination make?
August 26, 2015, 06:25
George UlrichI would imagine it would cause watch to run fast unless I am totally confused
August 26, 2015, 15:22
David AbbeThe Balance Wheel oscillates at a frequency governed by the Hairspring stiffness. So if a particular hairspring allows a certain cyclic rate/minute of rotation for the wheel, a lighter wheel on that same hairspring will allow a higher cyclic rate/minute of the wheel and the watch will appear to gain time with that wheel over the heavier one.
August 27, 2015, 18:04
Patrick WallinThanks to you both.
I figured it would gain. I just thought it would take more than 22 g or the weight of some balance wheel screws.