ARCHER 720 HT is a high-torque version of the heavy-duty ARCHER 720 rotary welding positioner, featuring a stand design for floor placement, a 905 mm working height, and a maximum working load of 720 kg. It is a powerful welding station designed for demanding and repeatable welding operations in industrial applications across all sectors, even under high hourly workloads. This machine provides an ideal solution for medium and large weldments where smooth rotation, stable speed, and a clean welding result are essential, with particular emphasis on the hollow spindle for welding long rod material. The HT version provides significantly increased spindle drive torque, making it particularly suitable for production programs that regularly operate near the upper load limit of the machine or for applications where eccentric loading from weldments is expected.
A heavy-duty, solid steel frame built to industrial standards carries the structure of a massive spindle with a through-hole of 144 mm, allowing comfortable welding of long rod or tube materials. The spindle design features a flange that allows comfortable use of a working plate with a recommended diameter of 800 mm as well as a 400 mm universal chuck with a through-hole of 144 mm. The hollow spindle can also be used to equip the machine with an integrated system for supplying inert gas through the spindle.
Control system R3 is integrated into the machine chassis and protected by a steel cover with the polycarbonate glass cover against splashes of welded metal. The rotary positioner is equipped with a quality stepper drive and a backlash-free planetary gearbox, ensuring perfectly smooth and constant rotational speed even under eccentric loads from the welded product to achieve a consistent weld around the entire circumference of the product. The precise combination of a stepper drive, planetary gearbox, and digital control also ensures repeatable return to the same home point without deviation.
Operation of the positioner can be made easier by using the foot controller for proportional speed regulation, which allows the spindle rotation speed to be adjusted during welding. A hand controller is another alternative for remote control of the positioner. In addition to controlling the rotation speed, both the foot controller and hand controller may include a selector for changing the rotation direction.
The spindle has a variable tilt range of 0 - 110°, ensuring the optimal welding position. The spindle tilt is driven by an asynchronous motor and conveniently controlled by buttons located at the front of the machine.
The positioner has integrated anchor points for the installation of a supporting column, which enables the positioner to be equipped with an advanced welding arm system. The welding arm has pneumatic control and three degrees of position adjustment.
At the end of the welding arm, there is a precise mechanical cross head for two-axis torch position adjustment in the range of +/- 15 mm. It features a backlash-free structure and allows the torch to be rotated by +/- 90° and tilted within a range of +/- 20°, with both movements featuring position locking in steps.
This rotary positioner is equipped with digital control system R3, specially designed by HST CREATIVE for circumferential welding and effective automation of this process. The positioner also has a controlled output for switching the welding source arc ON.
