Wouldn't that be better served by a notch on the ring that rotates as time goes? An inner ring could do minutes and small/large bumps can help identify the time down to the closest 5 minute increment
The machinery to translate scalar time into discrete bump movement is going to be complicate, fragile and costly, while rotating a ring instead of the single arms is feasible, has been done already and only need tactile feedback for feeling the relative positioning.
The machinery to translate scalar time into discrete bump movement is going to be complicate, fragile and costly, while rotating a ring instead of the single arms is feasible, has been done already and only need tactile feedback for feeling the relative positioning.
Edit: there http://www.perkinsproducts.org/store/748-thickbox_default/br...
Just add a second ring and you're basically done.