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Differential Adjuster Screw
Use the DAS110 in
The DAS110 is ideal as a drop-in replacement for the standard 1/4"-80 adjusters used on most Thorlabs' Kinematic Mirror Mounts and comes pregreased to ensure smooth mating into compatible components. To install the adjuster, screw the threads into the bushing by hand. Ensure that cross threading does not occur in order to avoid damage to the adjuster and bushing.
The Main Body B is also internally threaded with an M3 x 0.40 thread, this thread holds the intermediate actuator C, which may be rotated by a hex wrench. The key to the design is that the intermediate actuator is both internally and externally threaded allowing a differential movement to be achieved between the intermediate actuator C and the Push Rod D, as shown in the drawing above.
The external thread of the intermediate actuator is the same M3 x 0.40 mm thread internal to the main body. When the intermediate actuator is rotated clockwise, it moves out of the main body by 400 µm per revolution. Connected to the internal thread of the intermediate actuator is the push rod; the push rod mates to the intermediate actuator via a M3 x 0.375 thread and is restricted from rotating by the main body. Now as the intermediate actuator is rotated, it advances at the rate of 400 µm/rev, but the push rod retreats at 375 µm/rev. This results in a differential motion of the push rod that is equal to the net difference of the pitch of the two threads for total displacement of 25 µm/rev.
OEM & Custom Precision Screws
Thorlabs manufactures custom and high volume OEM precision screws and bushings with various diameters, lengths, and threads. To inquire about custom or OEM precision screws, please contact Technical Support or use the "Contact Us" form to the right. A specialist will contact you within 24 hours or the next business day.
Precision Screw Capabilities
Thorlabs' in-house machine shop, located in Newton, NJ, gives us the ability to quickly produce large quantities of precision screws and bushings. We are equipped to manufacture screw diameters ranging from 2 mm to 20 mm with lengths up to 165 mm and a maximum thread pitch of 200 TPI. Our standard adjuster screw design has a hardened steel ball tip to provide a single point of contact; for other applications we are able to provide adjusters without the steel ball. Custom orders can be achieved on a case-by-case basis. For large orders of an item, Thorlabs passes on to the customer the cost savings associated with planned production of high volumes of that item. For more information on Thorlabs' discount pricing policy, click the "V" link to the right. We also offer a large variety of stock precision screws, which are available here.
Fast Turn-Around Times
Precision Screw Production