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Precision Z-Theta air bearing positioner head

ABTech's Z-Theta positioning head combines precision rotary and linear air bearings in a compact single unit which can be mounted to X-Y gantries or other types of positioning systems, providing two additional axes of motion.

The compact 150 mm (6.0") square unit contains the unique dual air bearing system. Both the Theta and Z air bearings are fully constrained for maximum stiffness and performance. One air supply feeds both bearings. The Theta features a 150 mm (6.0") diameter thrust area and the Z-axis is a 50 mm (2.0") square precision rail. The Z rail provides better than 1.0 µm (40 µ") straightness over full travel, which ensures accurate work piece placement without the aid of control system compensation. The system can produce and support up to 45.4 Kg (100 lbs.) of force in the Z direction.

The Theta axis has 210° of travel available with electrical limits and hard stops. The Z-axis travel is 50 mm (2.0") with electrical limits and hard stops as well.

ABTech's modular design approach and full engineering services can respond quickly to provide a solution to your O.E.M. needs for ultra-precision motion.

Features:

• Fully constrained rotary air bearing - Theta axis
• Fully constrained within Theta, linear air bearing - Z-axis
• Ultra-smooth dual motion
• 210° Theta rotation
• 1.0 µm (40 µ") or less, Z Axis straightness in 50 mm (2.0")
• Rotary DC brushless servo on Theta axis
• Precision ball screw & stepper drive on Z-axis
• Non-influence ball screw coupling
• High resolution encoder
• End of travel limits & hard stops
• Low air consumption
• Turn key systems available to O.E.M.s
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