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30 mm Cage Cube Platforms
B3C Platform with FFM1 Dichroic Filter Holder, Post Mounted in a C6W 30 mm Cage Cube
The 30 mm cage cube platforms offered here are designed to hold our 30 mm cage cube optic mounts. These platforms are ideal for building optical setups involving prisms, beamsplitters, and other optics that are compatible with our 30 mm cage system. The platforms featured here can be mounted to either the top or bottom of a 30 mm cage cube (see video to the bottom left) and may also be post mounted. Before locking the platforms onto a cage cube, they can be rotated to nearly any angle, giving the user control over the position of the optic within a cage cube. The B4C platform offers additional kinematic translation via three setscrews located on the bottom of the platform.
When using these platforms with a C6W cage cube, there will be insufficient clearance to pass the two cage rods nearest the platform all the way through the cage cube. For the B3C and B4C platforms, the C6WA Mounting Adapter can be used to provide clearance for all four cage rods without sacrificing mounting surface area (see video to the bottom right). Alternatively, the cage rods can still be passed through the through holes opposite the rotating platform, or the C6W can be turned 90° with all four cage rods threaded into the 4-40 holes on opposite sides of the C6W.
Animation demonstrating how to attach a platform to a 30 mm cage cube.
Animation demonstrating how the C6WA Platform Adapter allows cage rods to pass through a 30 mm cage cube.
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. 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.
An example of the standard cage plate measurements determining cage system compatibility.
Click to Enlarge
The B3C and B4C Attached to C4W and C6W Cage Cubes to Allow Optics to be Mounted Inside
The B3C fixed cage cube platform mounts onto the top or bottom of our 30 mm cage cubes. This platform can be coarsely rotated while inside the cage cube prior to being locked down at almost any angle with the included 4-40 button-head screws and 1/16" hex key. The tapped holes on the B3C platform are ideal for mounting the 30 mm cage optic mounts. The metric M4-tapped holes may be used with our PM3/M clamping arm to hold items such as prisms.
The B3C(/M) platform is rigid and only offers coarse rotation positioning, while the B4C(/M) platform (offered below) has three adjusters to provide pitch, roll, and Z translation in addition to rotational positioning. The bottom of this platform has an 8-32 (M4)-tapped hole, thereby allowing it to be mounted onto a Ø1/2" post.
For a continuous or precision rotation adjustment, please see our 30 mm cage cube rotation platforms.
Click to Enlarge
The proper installation of a B4C viewed from the bottom of a C4W Cage Cube.
The B4C Kinematic Cage Cube Platform mounts into the top or bottom of our C4W or C6W cage cube (see image to the right). This platform can be coarsely rotated while inside the cage cube prior to being locked down at almost any angle with the included 4-40 button-head screws and 1/16" hex key. The tapped holes on this platform are ideal for mounting the 30 mm cage optic mounts. The metric M4 tapped holes may be used with our PM3/M clamping arm to hold items such as prisms.
The B4C(/M) platform has three adjusters [5/64" (2 mm) hex] to provide pitch, roll, and Z translation in addition to rotational positioning. The kinematic adjustment comes from three 1/4"-80 adjuster screws that give ±4° pitch/roll articulation and up to 0.125" of Z translation. The bottom of each platform has an 8-32 (M4)-tapped hole, thereby allowing it to be mounted onto a Ø1/2 Post.
Thorlabs also offers a 30 mm cage cube rotation platforms for more precise control of a platform mounted optic.
Click for Details
The C6WA is shown here with the B3CR. It can be mounted to the C6W Cage Cube with Thorlabs' Cube Platforms.*
Click for Details B5C1 in the C6W Cage Cube while allowing all four cage rods to be fully inserted in the through holes.
The C6WA(/M) Platform Adapter Kit allows Thorlabs' Cube Platforms* to be used in conjunction with the C6W with all four cage rods installed. The C6WA(/M) kit consists of two machined components, four 4-40 button-head screws, and a single 4-40 (M3) flat-head screw. A 0.08" (2.0 mm) thick shim allows the mounting platform to mate to the C6W without interfering with the cage rods while a secondary platform is then installed above the cage rods. The adapter platform has a diameter of 1.65" (41.9 mm) and raises the mounting surface height by 0.27" (6.9 mm).
The C6WA(/M)'s hole pattern consists of four 4-40 (M4) taps compatible with our Optic Holders and four 6-32 (M4) tapped holes allowing the use of a PM3(/M) Clamping Arm. When using one of these optic holders or a clamping arm with a rotating cage cube platform and the C6WA(/M), limited fine adjustment with the rotation platform is possible before the top of the mount or clamping arm interferes with the cage rods. This platform adapter is not designed for use with the FFM1.
To use the adapter, place the square shim between the bottom of the C6W and the cage cube platform [B3C(/M), B4C(/M)*, B3CR(/M)*, or B4CRP(/M)] that you wish to mount to the cage cube. Secure the cage cube platform to the cage cube through the holes in the shim using the four included 4-40 button-head screws (1/16" hex), as shown in the exploded view to the right. Insert the adapter platform through the top hole of the cage cube, angling it as needed to bypass the top cage rods, and attach it to the cage cube platform using the included 4-40 (M3) flat-head screw [1/16" (2 mm) hex]. Once the adapter platform is installed, the optic holder or clamping arm can be used to mount an optic inside the cage cube.
Please note that the vertical offset created by the raised mounting platform will make any optic mounted using our 30 mm-Cage-Cube-Compatible Optic Mounts no longer centered with respect to the SM1-threaded ports.
*The C6WA(/M) is not compatible with versions of the B3CR/M sold before March 26, 2014, or B3C(/M) and B4C(/M) platforms sold before December 5, 2012. If you have an older model of the B3CR/M, B3C(/M), or B4C(/M) platforms and would like to exhange it for the new version, please contact Technical Support.