5. Control Shafts and Control Knobs
These components were made from 6% glass filled nylon and turned brass. There were 3 different shafts with a standard control knob fitting all 3. The shafts were designed to snap fit into the watch case and the control knob was secured radially by 2 prongs and axially by a self-tapping screw into the end of the control shaft.
One of the control shafts had 7 different functions, all of which were individually prototyped and tested at scale 1:1
The control shafts were moulded by Dynacast’s New York subsidiary and the first samples arrived back 6 weeks after drawings were produced and everything worked right first time. There was no need to adjust any of the tools.
control knobs were manufactured in Switzerland on auto lathes with
secondary operations like knurling and milling, then plated.