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Ø1/2" Translating Post Holders
Thorlabs' specialty post holders provide mounting solutions for unique applications that could benefit from post holders that offer fine adjustment. Our Translating Post Holders provide height adjustment with ranges of either 0.45" (11.43 mm) or 0.65" (16.51 mm). For each revolution of the actuator ring, the post translates 0.025" (0.635 mm).
These Ø1/2" post holders feature an extra wide square relief cut machined vertically along the length of the part, as shown in the drawing to the right. This channel provides a highly-stable two-line contact between the post and post holder. Other post holder designs that do not have a relief cut provide less holding power, which leads to a downward drift in the post's position with time.
A swivel base adapter, which provides access to multiple mounting holes, allows the translating post holders to be mounted to an optical table or breadboard with easy alignment. We also offer replacement spring-loaded, hex locking thumbscrews to secure the post in the holder.
Our Translating Post Holders provide lockable, non-rotating height adjustment with convenient one-handed operation. An aluminum thumbscrew with a spring-loaded plunger provides holding force while the wide, square relief cut within the Ø1/2" post bore offers stable two-line contact. A knurled adjustment ring actuates the non-rotating height adjustment, which offers 0.025" (0.635 mm) of translational adjustment per revolution. Once the desired position is achieved, the entire mechanism can be locked using the lower thumbscrew and the locking hex socket on the upper thumbscrew. These post holders can be used with the Swivel Base Adapter featured below.
Our 360° swivel base adapter is compatible with the translating post holders (sold above) and minimizes the amount of time it takes to assemble an optical system. In addition, the swivel design is ideal for applications that require a large number of components to be packed into a small area. When our translating posts (featured directly above) are used with the UPHA adapter, the combination is nearly that of our very popular, non-translating UPH Series of Post Holders, which have an attached swivel base; however, unlike with the UPH series post holders, the adapter would prevent the translating post from touching the table. For ease of ordering, these base adapters are also available in packs of five.
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Exploded View of the TS25H Thumbscrew
The TS25H has 1/4"-20 threads while the TS6H/M has M6 x 1.0 threads for compatibility with our imperial and metric Ø1/2" post holders, respectively. The recommended maximum torque is 28 in·lbs (3.2 N·m). Please note that we do not recommend using an L wrench to tighten the thumbscrew, as this may break off the screw head.
If a thumbscrew without a spring-loaded tip is preferred, we recommend our vacuum-compatible thumbscrews. Alternatively, the tips can be removed from these thumbscrews by unthreading the setscrew in the front of the thumbscrew with a 1/16" (1.5 mm)
For ease of ordering, these thumbscrews are available individually or in packages of five.