/fa/ - Fashion

>>14724919
The bulova ticks at 16Hz last I checked. So it looks pretty smooth but it's much more coarse than the old tuning forks, beta 21, 5s21, and especially the spring drive. The spring drive is really the only movement that has a "true" smooth seconds sweep and not just a number of steps per second that looks smooth.
That said the way the 5s21 does it is the stepper motor moves at 4Hz and there's a spring/fluid dampener that smooths out the movement of the seconds hand. You can see the individual steps on the gear to the bottom right and the much smoother turning gear nearer the middle here.

>>13702306
It's a 4Hz motor that's smoothed out with an oil capsule iirc. I'm sure the owner can go into more detail.