Self-centering chuck of six clamping points

It is developed from the three-jaw self-centering chuck shown at
http://youtu.be/0ERIZeZhckw
A jaw lever (in pink) is pivoted on each green slider. Thus, the orange work (a stepped shaft) can be well centered and firmly clamped through six points.
See real chucks:
https://youtu.be/Gic4pCI9GuU

Inventor files of this video:
http://www.mediafire.com/file/6qj36wstdn101kq/Self-centeringChuck6ClampingPointsInv.zip/file

Видео Self-centering chuck of six clamping points канала thang010146