16 mm Cage System Construction Rods
SR Series Cage Rods
16 mm Cage System Components:
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. Please see the Cage Overview tab for more details on this widely adopted construction standard.
Standard Assembly Rods
Our precision-ground cage assembly rods are basic building blocks used to construct optical systems. These rods are most commonly used as precision guides for our cage assembly plates and have a 4 mm diameter for 16 mm cage systems. Each rod has a removable 4-40 stud in each end, and all rods are designed to be stackable. An infinite array of systems can be assembled when used in conjunction with our cage plates and lens tubes. Please see the Construction tab for more information on building cage systems.
Cage Couplers and Adapters
The 16 mm cage rod adapters offered here enable the easy addition or removal of components from cage assemblies. The SRSCA cage adapter can be used to connect Ø4 mm SR rods to 4-40 internally threaded components.The S1A cage rod coupler provides a method of connecting rods at 90° angles.
The S3A swivel connector can be used to connect cage assemblies at arbitrary angles. These parts are made from stainless steel and provide an extremely rigid structure.
SRSCA 1D Construction
Click to Enlarge
The SRSCA SR rod adapter allows for the end-to-end joining of two SR rods. It has an internal bore on one end that accepts Ø4 mm SR series rods. To join two rods, position the end of one rod inside the SRSCA, and lock it into place using the locking setscrew. Thread the other end of the SRSCA into the other rod (see photo at right).
ER90C Right Angle Rod with
ER90L Spacer Rod
S3A Swivel Connectors
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These assembly rods are essential components when configuring cage systems in complex, multi-dimensional structures.
The S3A swivel connectors can be configured to any arbitrary angle before being locked into place (see photo at right).
The ER90C right angle rods offer a fixed 90° connection to a cage system (see photo to left). Using the ER90A spacer rod for 30 mm cage systems and the ER90L spacer rod for 60 mm cage systems will ensure center-to-center spacing. Alternatively, a cage cube can be used to create a rigid 90° connection.
When constructing complex optomechanical cage assemblies, it is sometimes necessary to couple one cage subsystem to another. Between the S1A cross coupler for 16 mm cages, the C1A cross coupler for 30 and 60 mm cage systems, and the C2A swivel coupler with 180° swing, virtually any configuration can be achieved.
As shown to the left, the threaded side of the ERSCA adapter is connected to the ST1XY-S translation mount. The cage rod slides into the other side of the adapter and is secured in place with the setscrew. Using the ERSCA adapters, components can easily be added to or removed from setups without causing misalignment.
The cage assembly components offered here can be used to couple 16 mm, 30 mm, and 60 mm cage systems. The parts used in the following setup are listed below:
An example of the standard cage
plate measurements determining
cage system compatibility.
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 to right). 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. All locking setscrews used in these cage plates are standard 4-40 setscrews, which use a 0.05" hex key.
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.
These 16 mm cage rods are made from stainless steel and are designed for use with our Mini Series Components. The 4-40 threaded stud at each end of the cage rod can be removed, leaving a 4-40 tapped hole. This allows multiple cage rods to be connected end-to-end.
The SRSCA is a stud adapter that will allow any cage assembly to be easily separated when adding or removing components. This adapter has an internal bore on one end that accepts an internally threaded Ø4 mm SR series rod. Once the rod is positioned inside of the adapter, a mounting stud collar with a 2-56 locking setscrew is used to hold the rod in place. On the other side of the adapter, there is an externally 4-40 threaded stud that can be threaded into the end of another SR series rod or 4-40 internally threaded cage component.
As seen in the images below, the SRSCA is particularly useful for connecting two internally 4-40 threaded cage system components with Ø4 mm SR series cage rods.
Thread the SR series cage rods directly into the KCB05 16 mm Right-Angle Kinematic Cage Mount as shown above. Then thread four SRSCA adapters into the SC6W Compact 6-Way Cage Cube. Finally, insert the Ø4 mm SR series rods into the internal bores on the SRSCA adapters and secure using the 2-56 locking setscrews.
The S3A swivel connector allows 16 mm SR cage assembles to be connected at a range of angles up to ±90° from the system normal. Made from stainless steel, these lockable couplers result in very rigid structures.
The S1A cross coupler is designed for Thorlabs' Ø4 mm, SR series of cage rods. This coupler provides a method to attach a terminating SR rod at 90° to an SR rod that is passed through the clamp. Using two cap screws, the flexure design clamps onto both cage rods. The S1A is ideal for constructing 3D cage structures based on Thorlabs' 16 mm cage system, as shown in the example at right (for details,see Construction tab).