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30 mm Cage System U-Bench
Standard 30 mm Cage
The CBB1(/M) Cage System U-Bench provides a tapped mounting surface within a standard 30 mm cage assembly or a Ø1" lens tube setup. A generous supply of 1/4"-20 (M6 x 1.0) and 8-32 (M4 x 0.7) tapped holes provide the flexibility necessary to construct small optical assemblies within the U-Bench that might not otherwise fit within the standard cage rods. The U-bench is made from a single piece of aluminum and finished with precision machining to provide stability and maintain the alignment of the overall system. Each end is tapped with our standard SM1 (1.035"-40) thread making it compatible with a wide range of optical mounting components such as our Ø1" lens tubes. Each cage rod through hole is accompanied by a side-located M4 x 0.7 locking setscrew with a 5/64" (2.0 mm) hex.
Cage System Overview
The Cage Assembly System provides a convenient way to construct large optomechanical systems with an established line of precision-machined building blocks designed for high flexibility and accurate alignment.
16 mm, 30 mm, and 60 mm Cage System Standards
Thorlabs offers three standards defined by the center-to-center spacing of the cage assembly rods (see image below). The 16 mm cage, 30 mm cage, and 60 mm cage standards are designed to accomodate Ø1/2", Ø1", and Ø2" optics, respectively. Specialized cage plates that allow smaller optics to be directly inserted into our larger cage systems are also available.
The flexibility of our Cage Assembly System stems from well-defined mounting and thread standards designed to directly interface with a wide range of specialized products. The three most prevalent thread standards are our SM05 Series (0.535"-40 thread), SM1 Series (1.035"-40 thread), and SM2 Series (2.035"-40 thread), all of which were defined to house the industry's most common optic sizes. Essential building blocks, such as our popular lens tubes, directly interface to these standards.
An example of the standard cage plate measurements determining cage system compatibility.