The Robert Sorby Eccentric Chuck is the most sophisticated chuck for multi-centre turning.
Ease and accuracy of adjustment (without removing the workpiece from the chuck) is provided by the unique offset boss which accommodates the three different driving components on which to mount your workpieces, viz:-
1 - Screwchuck
2 - Ball drive and socket
3 - Faceplate
The Eccentric Chuck provides the means of driving from the headstock with or without tailstock support. The boss can be off-set incrementally by 1¼" (30mm) from zero datum point.