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Rail Platform Positioners for 34 mm Rails
Rail Platform Positioner
Rail Platform Return Positioner
Fine Tuning a
Thorlabs' XT34N and XT34N1 Rail Platform Positioners are designed to aid in fine alignment of optics mounted on a 34 mm rail platform. The XT34N positioner consists of a M2.5 x 0.2 adjuster screw that is incorporated into a 34 mm rail clamp. The screw provides smaller, smoother movement than coarse translation by hand. One revolution of the screw will result in a translation of 0.0079" (200 µm), and the included F2D5ES20 M2.5 x 0.2 adjuster screw can travel 0.45" (11.43 mm), measured from the front surface of the clamp; longer adjuster screws can be installed if desired.
The XT34N1 rail return positioner provides passive adjustment when used in conjunction with the XT34N positioner. When a platform is placed between the platform positioners, retracting the adjustment screw on the XT34N positioner allows the spring-loaded plunger on the XT34N1 return positioner to push the carriage back a maximum of 0.195" (4.95 mm). Additionally, the return positioner provides stability while making adjustments. The compression spring tension can also be adjusted with a 5/64" (2.0 mm) hex key.
To use, place the positioners on the rail so the ball of the adjuster screw and the tip of the plunger come into contact with the clamping platform or rail carriage to be positioned, noting that this platform will move in the direction away from the XT34N positioner. Then tighten down the positioners using a 1.5 mm hex driver. Once both the positioners are secured, loosen the clamp holding the platform or carriage to the rail, then turn the adjuster screw with a 1.5 mm hex driver to push the platform until the desired amount of translation is achieved.
We do not recommend using these positioners with assemblies that use our XT34C1 or XT34C2 Double Dovetail Clamps to attach to the rail. Since it is necessary to loosen the clamp to translate the assembly, any optomechanics held by the clamp will also be loose, potentially leading to unintended movements.
Thorlabs offers a wide and growing complement of accessories for 34 mm rails, including clamps and angle brackets, breadboard mounts, rail carriers, mounting platforms, lens tube adapters, and rail joiners. Together with size adapters that incorporate 66 mm and 95 mm rails into an XT34 setup, these tools provide a complete family of rigid, versatile building blocks suited for virtually any optomechanical setup.