Open-chuck Positioners were developed to compensate the disadvantages of standard positioners and turning rolls, and are primarily used for welding of pipes and for applications of higher level than that of positioners. As the rotary shat is hollow and notched, even work-pieces of intricated shape can be rotated. Further high accurate rotation is available, since the rotary ring gear is large to work-piece.
Open-chuck Positioners were developed to meet following demands;