O-Type Single Axis Horizontal Welding Positioner for 300-1000kg Parts The GBS-02-03 series is an O-type single axis welding positioner that rotates a workpiece horizontally so the robot always welds in the flat position. A closed O-frame carries the spindle and the welding earth return, giving a rigid circle of support around a Φ500mm-class table that turns through 0-360° with a positioning accuracy of ≤1arcmin. Three load classes cover 300kg, 500kg and 1000kg, table height