Offset Joggle Machines
Advantages of Offset Joggle Machine
- Decreases Fit-up Time
- Decreases Likelihood of Leaks
- Increases Welding Speeds
- Speeds up Assembly
- Eliminates Back-up Bars
- Eliminates Burn Through
- Can be used on Multi-Course Vessels
The forming dies are both made of heat-treated special alloy steel and are power rotated. The power rotation system includes a dual voltage, three-phase AC induction motor that drives a heavy-duty, dual chain drive to an enclosed oil bath worm gear reducer. The reducer, directly connected to the lower roll shaft, drives the upper shaft through a set of heavy spur gears. Each shaft is equipped with an anti-friction thrust bearing to absorb the heavy thrust loads developed during the offsetting operation.
Offsetting pressure is applied through the vertical movement of the upper forming die shaft, which is forced downward or retracted by a toggle joint actuated by a hydraulic cylinder. The hydraulic cylinder is fed by a hydraulic pump driven through a twin V-belt drive by a dual voltage, three-phase AC induction motor.
The plate thickness adjustment is done only once for each change of thickness in a production run and is easily made using two eccentric bushings marked with a plate thickness scale. One eccentric controls the vertical “bottoming” setting of the upper die, while the other controls the horizontal space between die faces. The width of the offset flange is controlled by two adjustable thrust rollers, one on each side of the forming dies. Each of our Offset Joggle machines are made with a heavy fabricated steel construction and all the critical areas are planed for accuracy.