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Manual Drives, 1" and 2" Differential Actuators
Thorlabs offers a number of Manual Drives for use with RollerBlock Stages. These drives in paticular can be fitted to components with a standard 3/8" or 0.5" mounting barrel.
Fine Adjustment Knob Reattachment for Differential Adjusters
Differential Adjuster Operation Mechanisms
A differential adjuster consists of four basic parts: outer body, coarse adjustment lock, inner spindle, and fine adjustment knob. Using the DM22 as an example, the video to the left demonstrates how these four parts come together to create a device that allows for coarse and fine adjustments. Also detailed are two different methods of mounting these actuators into an assembly.
Differential Adjuster Mechanisms
The DM12 Differential Adjuster uses two leadscrews; one pushes the center spindle forward at 400 µm per revolution, while the other pulls it back at 375 µm per revolution. The resultant total forward motion of the center spindle is just 25 µm for each complete revolution of the graduated knob. Each small graduation of the fine control knob is 0.5 µm; the smallest incremental move for the DM12 is approximately 0.5 µm. The coarse travel is lockable via a thumbscrew located on the 3/8" mounting barrel. Also available is the DM10 1/2" Differential Adjuster. For more details on the operating mechanism of the DM12, please refer to the DM12 Operation tab.
If the fine adjustment knob on the DM12 is ever removed from the actuator body, it can be reattached. Please see the DM12 Knob Attachment tab for more details. Follow the reattachment instructions carefully so that the actuator functions properly.
This differential drive has been designed for use with single-axis stages equipped with a Ø1/2" (Ø12.7 mm) actuator mounting clamp. The large-diameter differential drive actuator provides fine, ultra-smooth control over motion. The fine adjuster delivers 50 µm of travel per revolution with 1.0 µm graduations. The removable brass bushing allows this actuator to be used in any OEM application requiring 2" (50 mm) of overall travel.