Direct Drive Theta (DDT)
Direct Drive Theta (DDT) rotary stage
Our Direct Drive Theta (DDT) rotary stage units feature a compact mechanical design that makes them easy to integrate into metrology systems and other machines that need precision positioning.
Low Profile, Large Through Holes. DDT units are available in two sizes, both with ample space in the middle to bring power and utilities to the top of the stage. The DDT 100 offers a 15 mm through hole, and the DDT 200 has a 50 mm through hole. Both units are less than 50 mm tall.
Precise Angular Alignment. DDT rotary stages provide superb angular alignment capabilities. The DDT 100 model has an accuracy of ± 12 arc-sec, while the DDT 200 models have an accuracy of ± 6 arc-sec. Both units have a bi-directional repeatability of ± 1 encoder count.
Consistent Motor Tuning. DDT units have been engineered with extremely fine preload adjustments, which allow users to maintain consistent motor tuning.
Ease of integration. DDT models install with just a four-bolt connection. Top plates can be configured to user specifications. The DDT 200 additionally offers three-point adjustable levelling mounts with mechanism for tip, tilt and elevation adjustments.
Rugged. DDT features anodized aluminium construction with stainless steel hardware.
|Type||Direct Drive Rotary|
||Preloaded duplex angular contact
||Kingpost style angular contact|
||15 mm (0.59 in.)
||50 mm (1.97 in.)|
|Repeatability||Control Dependent, ±1 count possible|
|Resolution choices (includes index pulse)
||1 µm, 0.5 µm, 0.2 µm, 0.1 µm
(75 mm ring)
|1 µm, 0.5 µm, 0.2 µm, 0.1 µm
(200 mm ring)
|236.8, 473.6, 1184, 2368||629.8, 1260, 3149, 6298|
Load capacity axial/radial (kN)Load capacity are for L10 rating life of 1 million table revolutions. Load capacity is not equivalent to payload. The ability to servo control a given payload is dependent on inertia, motion profile, duty cycle and control architecture.
|Stage weight (kg, less motor)||1.5