Answers about FRICTION
"There is no body in motion without friction! One of the subtleties of Calasys
is that the friction of the Calasys is continuous, therefore controllable ... You
just have to calculate it well and apply the appropriate solutions that I have
developed. No perfect mechanical system exists but it is, in my opinion, much
more ingenious to control the friction of the Calasys rather than accept all
the faults of the balance spring!"
Antoine PREZIUSO adds this photo to explain how less frictions could be induced.