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These differential adjusters are designed for use on stages with a 9.5 mm (3/8") mounting clamp. The DRV304 is ideal for updrading our RB13M 3-axis RollerBlock stage to differential drives. The DM10 is for use with our MT1 and MT3 stages.
See the presentations below for more details.
Fine Adjustment Knob Reattachment for DM10 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 DRV304 Differential Micrometer uses a unique mechanism that converts a relatively large displacement into a relatively small displacement of the center fine adjustment spindle. The design has the additional benefit of providing a uniform, smooth feel that is largely independent of loading. Coarse adjustment is provided via a knurled knob, while the differential adjuster features a large rubber grip which adds to the overall sensitivity of the unit. The coarse adjustment knob gives 13 mm of total travel with 5.0 µm resolution while the differential knob provides 300 µm of total travel with 0.5 µm resolution. The Ø3/8" mounting barrel is compatible with a host of standard mounting equipment.
The DM10 Differential Adjuster uses two internal leadscrews; one pushes the center spindle forward at 400 µm per revolution, and one pulls it back at 375 µm per revolution. The resultant total forward motion of the center spindle is just 25 µm per one complete revolution of the graduated knob. For more details on the operating mechanism of the DM10, please refer to the DM10 Operation tab.
Each graduation of the fine control knob is 0.5 µm. The coarse adjustment provides 1/2" of travel with a screw pitch of 0.5 mm, which is lockable via a thumbscrew located on the mounting barrel.
If the fine adjustment knob on the DM10 is ever removed from the actuator body, it can be reattached. Please see the DM10 Knob Attachment tab for more details. Follow the reattachment instructions carefully so that the actuator functions properly.
If a longer travel range is needed we also offer our DM12 1" Differential Adjuster.