Products Home / Manual Stages / Manual Rotation Stages / Compact Quick Connect Rotation Stage with Crossed-Roller BearingsCompact Quick Connect Rotation Stage with Crossed-Roller Bearings
- Continuous 360° Manual Rotation with ±5° Fine Adjustment
- Vernier Scale Provides 5 arcmin Resolution
- Low Axial Wobble and High Load Capacity
- Integrated 2" Dovetails
Fine Adjuster
Rotation Locking Screw
Fine Adjuster Engagement Screw
Dovetail Locking Screw
Application Idea
The XRNR1 Rotation Stage is directly compatible with our XRN Series Stages. Here it is shown mounted on an XRN25P stage with a dispersing prism and a PM3 Clamping Arm.
XRNR1
Compact Rotation Stage
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| Specifications | ||
|---|---|---|
| Item # | XRNR1(/M) | |
| Coarse Rotation Range | 360°, Continuous | |
| Fine Adjustment Range | ±5° | |
| Fine Adjustment Resolution (Nominal) |
8.33 mrad/rev (0.477°/rev) | |
| Axial Wobble | <500 µrad (0.028°) | |
| Horizontal Load Capacity |
Overall: 30 lbs (13.6 kg) Fine Adjustment: 10 lbs (4.54 kg) |
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| Vertical Torque Capacitya | 5 lb-in (0.56 N·m) | |
| Platform Size | Ø2.21" (Ø56.0 mm) | |
| Platform Mounting Holes |
1/4"-20 (M6 x 1.0) (13 Places) 8-32 (M4 x 0.7) (4 Places) 6-32 (M4 x 0.7) (4 Places) |
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| Mounted Platform Height |
On Breadboard: 0.91" (23.0 mm)b Dovetail Stacked: 0.83" (21.0 mm) |
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| Base Dimensions | 3.35" x 2.52" (85.0 mm x 63.9 mm) | |
| Base Mounting Features | 2" Quick Connect Dovetails | |
| Mounting Slot for 1/4"-20 (M6) Cap Screws (4 Places) |
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Features
- 360° of Continuous Coarse Rotation and ±5° Fine Adjustment
- Vernier Scale Provides 5 arcmin Resolution
- Radial Crossed-Roller Bearing for High Load Capacity and Low Axial Wobble
- Circumference is Laser Engraved at 1° Increments
- Tapped Holes for Standard Optomechanics and Clamping Arms
- Quickly Connect Stages and Accessories Using 2" Dovetails
- See the Quick-Connect Stages Tab for Complete Line of Components
Thorlabs' XRNR1(/M) Rotation Stage provides 360° of continuous manual rotation and features a side-mounted screw for fine adjustment. It also incorporates a radial crossed-roller bearing design for high load capacity and low axial wobble. This dedicated, zero-clearance bearing mechanism also provides an axial constraint for the rotating world, resulting in superior stiffness compared to other bearing types. The top and bottom plates are machined from cast tool and jig aluminum for minimal internal stress and improved stability. The rotating world features an array of mounting holes and 2" male dovetails for compatibility with our XRN25 compact translation stages and the accessories sold below. We also offer the XRR1 Rotation Stage with 3" male dovetails.
When the fine adjustment is disengaged, the stage can be smoothly and continuously rotated by hand through a full 360°, measured by the 1° graduation marks on the circumference of the stage. When the fine adjustment is engaged, the fine adjuster screw provides ±5° of fine adjustment, measured with 5 arcmin resolution by the vernier scale. The end of the adjuster screw incorporates a 5/64" (2.0 mm) hex allowing it to be actuated in space-constrained environments. The adjuster knob can also be removed using a hex key, as illustrated in the video on our kinematic mirror mounts page. The rotating platform is lockable using the 5/64" (2.0 mm) hex screw on the end of the base. The top plate of each stage is tapped with an array of mounting holes. The base can be attached to an optical table or breadboard using the four 1/4" (M6) counterbored clearance slots.
Each stage features 2" quick connect dovetails on the top and bottom plates (as shown in the image below) that allow for quick construction of multi-axis systems using no additional hardware. Refer to the photos in the vertical assembly kits section below to see how multi-axis systems can be quickly constructed using this novel design. The 2" dovetails on our XRNR1(/M) rotation stage are directly compatible with the dovetails on our XRN25 series compact translation stages. Additional functionality is provided by a complete line of accessories that include multi-axis assembly kits, rail carriers, base plates, and stage positioners. An adapter plate for mounting to our larger XR25 and XR50 Series Stages with integrated 3" dovetails is also available. For more information about our quick-connect construction components, see the Quick-Connect Stages tab.
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The 2" female dovetails on the bottom of the stage mate with the male dovetails on another stage to form multi-axis configurations. The left female dovetail is on a retractable clamping arm, allowing stages to be dropped into place.
The XRNR1(/M) Rotation Stage provides 360° of coarse rotation and ±5° of fine rotation. Each stage features 2" dovetails on the top and bottom plate that allow for quick construction of multi-axis systems. The top stage can be locked at any location along the dovetail, allowing for coarse positioning. The base of the stage also has counterbores for mounting directly to optical breadboards.
Reading a Vernier Scale on a Linear Main Scale
Vernier scales are typically used to add precision to standard, evenly divided scales (such as the scales on Thorlabs' rotation, goniometric, or translation mounts). A vernier scale has found common use in many precision measurement instruments, the most common being calipers and micrometers. The vernier scale uses two scales side-by-side: the main scale and the vernier scale. The direct vernier scale has a slightly smaller spacing between its tick marks owing to the vernier scale having N ticks for every N - 1 ticks on the main scale. Hence, the lines on the main scale will not line up with all the lines on the vernier scale. Only one line from the vernier scale will match well with one line of the main scale, and that is the trick to reading a vernier scale.
Figures 1 through 3 show a linear vernier scale system for three different situations. In each case, the scale on the left is the main scale, while the small scale on the right is the vernier scale. When reading a vernier scale, the main scale is used for the gross number, and the vernier scale gives the precision value. In this manner, a standard ruler or micrometer can become a precision instrument.
The 0 on the vernier scale is the "pointer" (marked by a red arrow in Figures 1 - 5) and will indicate the main scale reading. In Figure 1 we see the pointer is lined up directly with the 75.6 line. Notice that the only other vernier scale tick mark that lines up well with the main scale is 10. Since the pointer lines up with the main scale’s 75.6, the reading from Figure 1 is 75.60 (in whatever units the instrument measures).
That is essentially all there is to reading a vernier scale. It's a very straightforward way of increasing the precision of a measurement instrument. To expound, let’s look at Figure 2. Here we see that the pointer is no longer aligned with a line on the main scale, but instead it is slightly above 75.6 and below 75.7; thus, the gross measurement is 75.6. The first vernier line that coincides with a main scale line is the 5, shown with a blue arrow. The vernier scale gives the final digit of precision; since the 5 is aligned to the main scale, the precision measurement for Figure 2 is 75.65.
Since this vernier scale is 10% smaller than the main scale, moving the vernier scale by 1/10 of the main scale will align the next vernier marking. This asks the obvious question: what if the measurement is within the 1/10 precision of the vernier scale? Figure 3 shows just this. Again, the pointer line is in between 75.6 and 75.7, yielding the gross measurement of 75.6. If we look closely, we see that the vernier scale 7 (marked with a blue arrow) is very closely aligned to the main scale, giving a precision measurement of 75.67. However, the vernier scale 7 is very slightly above the main scale mark, and we can see that the vernier scale 8 (directly above 7) is slightly below its corresponding main scale mark. Hence, the scale on Figure 3 could be read as 75.673 ± 0.002. A reading error of about 0.002 would be appropriate for
this instrument.
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Figure 1: An example of how to read a vernier scale. The red arrow indicates what is known as the pointer. Since the tick mark labeled 10 on the vernier scale aligns with one of the tick marks on the main scale, this vernier scale is reading 75.60 (in whatever units the instrument measures).
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Figure 2: The red arrow indicates the pointer and the blue arrow indicates the vernier line that matches the main scale. This scale reads 75.65.
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Figure 3: The red arrow indicates the pointer, and the blue arrow indicates the vernier line that matches the main scale. This scale reads 75.67 but can be accurately read as
75.673 ± 0.002.
Reading a Vernier Scale on a Rotating Main Scale
The vernier scale may also be used on rotating scales where the main scale and vernier scale do not share units. Figures 4 and 5 show a vernier scale system for two different situations where the main scale is given in degrees and the vernier scale has ticks every 5 arcmin (60 arcmin = 1°). In each case, the scale on the top is the main scale, while the small scale on the bottom is the vernier scale.
In Figure 4 we see the pointer is lined up directly with the 341° line. Notice that the only other vernier scale tick marks that line up well with the main scale are ±60 arcmin. Since the pointer lines up with the main scale at 341°, the reading from Figure 4 is 341.00°.
There are two ways to determine the reading if the zero on the vernier scale line is between two lines of the main scale. For the first method, take the line on the left side of the pointer on the vernier scale and subtract that value (in arcmin) from the value on the main scale that is to the right on the main scale. As an example, in Figure 5 the vernier pointer is between 342° and 343°; using the left blue arrow of the vernier scale results in
As we've seen here, vernier scales add precision to a standard scale measurement. While it takes a bit of getting used to, with a little practice, reading these scales is fairly straightforward. Vernier scales, whether they are direct or retrograde*, are read in the same fashion.
*A retrograde vernier scale has a larger spacing between its tick marks with N ticks for every N + 1 ticks on the main scale.
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Figure 4: An example of a vernier scale where the main scale and the vernier scale are in different units (degrees and arcmins, respectively). The red arrow indicates the pointer. This scale reads 341.00°.
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Figure 5: The red arrow indicates the pointer and the blue arrows give the precision value from the vernier scale.
This scale reads 342.75°.
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Rotation Mount and Stage Selection Guide
Thorlabs offers a wide variety of manual and motorized rotation mounts and stages. Rotation mounts are designed with an inner bore to mount a Ø1/2", Ø1", or Ø2" optic, while rotation stages are designed with mounting taps to attach a variety of components or systems. Motorized options are powered by a DC Servo motor, 2 phase stepper motor, piezo inertia motor, or an Elliptec™ resonant piezo motor. Each offers 360° of continuous rotation.
Manual Rotation Mounts
| Rotation Mounts for Ø1/2" Optics | |||||||
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| Item # | MRM05(/M) | RSP05(/M) | CRM05 | PRM05(/M)a | SRM05 | KS05RS | CT104 |
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| Features | Mini Series | Standard | External SM1 (1.035"-40) Threads |
Micrometer | 16 mm Cage-Compatible | ±4° Kinematic Tip/Tilt Adjustment Plus Rotation | Compatible with 30 mm Cage Translation Stages and 1/4" Translation Stagesb |
| Additional Details | |||||||
| Rotation Mounts for Ø1" Optics | ||||||||
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| Item # | RSP1(/M) | LRM1 | RSP1D(/M) | DLM1(/M) | CLR1(/M) | RSP1X15(/M) | RSP1X225(/M) | PRM1(/M)a |
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| Features | Standard | External SM1 (1.035"-40) Threads |
Adjustable Zero | Two Independently Rotating Carriages | Rotates Optic Within Fixed Lens Tube System |
Continuous 360° Rotation or 15° Increments |
Continuous 360° Rotation or 22.5° Increments |
Micrometer |
| Additional Details | ||||||||
| Rotation Mounts for Ø1" Optics | ||||||
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| Item # | LM1-A & LM1-B(/M) |
CRM1T(/M) | CRM1LT(/M) | CRM1PT(/M) | KS1RS | K6XS |
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| Features | Optic Carriage Rotates Within Mounting Ring | 30 mm Cage-Compatiblea | 30 mm Cage-Compatible for Thick Opticsa |
30 mm Cage-Compatible with Micrometera |
±4° Kinematic Tip/Tilt Adjustment Plus Rotation | Six-Axis Kinematic Mounta |
| Additional Details | ||||||
| Rotation Mounts for Ø2" Optics | |||||||
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| Item # | RSP2(/M) | RSP2D(/M) | PRM2(/M) | LM2-A & LM2-B(/M) |
LCRM2A(/M) | KS2RS | K6X2 |
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| Features | Standard | Adjustable Zero |
Micrometer | Optic Carriage Rotates Within Mounting Ring | 60 mm Cage-Compatible | ±4° Kinematic Tip/Tilt Adjustment Plus Rotation | Six-Axis Kinematic Mount |
| Additional Details | |||||||
| Rotation Drive Mechanism and Adjustment Range | Manual, 360° Continuous | Coarse: Manual, 360° Continuous; Fine: ±7° Micrometer |
Manual, 360° Continuous | ||||
| Optic Mounting | Internally SM2-Threaded Carriage | Internal SM2 Threads in LM2-A |
Internally SM2-Threaded Carriage | ||||
| Maximum Accepted Optic Thickness | 0.51" (13 mm) | 0.54" (13.7 mm) | 0.48" (12.2 mm) | 0.46" (11.7 mm) | 0.52" (13.2 mm) | 0.47" (12 mm) | 0.53" (13.4 mm) |
| Post Mounting | 8-32 (M4) Tap | 8-32 (M4) Tap in LM2-B | 8-32 (M4) Tap | Four Counterbores for 8-32 (M4) Cap Screws | Six Counterbores for 8-32 (M4) Cap Screws | ||
| Cage System Compatibility | N/A | Four 4-40 (M3) Taps on Rotation Dial with 60 mm Spacing |
N/A | Four Bores for Ø6 mm Cage Rods with 60 mm Spacing |
N/A | N/A | |
Manual Rotation Stages
| Manual Rotation Stages | ||||||
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| Item # | RP005(/M) | PR005(/M) | MSRP01(/M) | RP01(/M) | RP03(/M) | QRP02(/M) |
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| Features | Standard | Two Hard Stops | ||||
| Additional Details | ||||||
| Manual Rotation Stages | ||||||
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| Item # | XRNR1(/M) | XRR1(/M) | PR01(/M) | CR1(/M) | XYR1(/M) | OCT-XYR1(/M) |
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| Features | Fine Rotation Adjuster and 2" Wide Dovetail Quick Connect |
Fine Rotation Adjuster and 3" Wide Dovetail Quick Connect |
Fine Rotation Adjuster and SM1-Threaded Central Aperture |
Fine Pitch Worm Gear | Rotation and 1/2" Linear XY Translation | |
| Additional Details | ||||||
Motorized Rotation Mounts and Stages
| Motorized Rotation Mounts and Stages with Central Clear Apertures | |||||
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| Item # | DDR25(/M) | PDR1C(/M) | PDR1(/M) | PDR1V(/M) | PDXR1(/M) |
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| Features | Compatible with SM05 Lens Tubes, 16 mm Cage System, & 30 mm Cage System |
Compatible with 16 mm Cage System |
Compatible with SM05 Lens Tubes & 30 mm Cage System |
Vacuum-Compatible; Also Compatible with SM05 Lens Tubes & 30 mm Cage System |
Compatible with SM05 Lens Tubes & 30 mm Cage System |
| Additional Details | |||||
| Motorized Rotation Mounts and Stages with Central Clear Apertures | |||||
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| Item # | K10CR1(/M) | PRM1Z8(/M)a | DDR100(/M) | ELL14 | HDR50(/M) |
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| Features | Compatible with SM1 Lens Tubes & 30 mm Cage System | Compatible with SM1 Lens Tubes, 16 mm Cage System, 30 mm Cage System |
Compatible with SM1 Lens Tubes, Open Frame Design for OEM Applications |
Compatible with SM2 Lens Tubes |
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| Motorized Rotation Mounts and Stages with Tapped Platforms | ||
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| Item # | PRMTZ8(/M)a | ELL18(/M)b |
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| Features | Tapped Mounting Platform for Mounting Prisms or Other Optics | Tapped Mounting Platform, Open Frame Design for OEM Applications |
| Additional Details | ||
Build Multi-Axis Configurations
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Z-axis assembly kits allow stages to be mounted in vertical orientations.
Quick-Connect Dovetails
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The female dovetails on the bottom of one stage mate with the male dovetails on another.
XR & XRN Dovetail Stages and Accessories
Our XR series manual stages feature quick-connect dovetails that allow for the construction of multi-axis systems without the need for additional hardware. The common dovetail feature with a single locking clamp makes it quick and simple to swap parts in and out while preserving excellent orthogonality.
Our selection of products with a quick-connect dovetail includes:
- Linear Translation Stages:
- Stackable 1-Axis Stages
- Pre-Assembled 2- and 3-Axis Configurations
- Rotational Stages:
- 360° Flat Rotation
- Tip/Tilt Goniometers
- Adapters:
- Z-Axis Assembly Kits
- Parallel and Perpendicular Mounting between 2" and 3" Dovetails
- Rail Accessories:
- Stationary Mounting Platforms
- Rail Component Positioners
- Base Plates and Rails
Most items are available in compact (2" dovetail) and full-size (3" dovetail) varieties. Adapters are available to interface between the two sizes. See the tables below for all available options.
| Linear Translation Stages | |||||
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| Items | Compact 25 mm Stages | Compact 9 mm Vertical Stage | Full-Size 25 mm Stages | Full-Size 50 mm Stages | 14 mm Vertical Stage |
| Motion | X, Y, Z, XY, XZ, YZ, XYZ | Z (Vertical) | X, Y, Z, XY, XZ, YZ, XYZ | X, Y, Z, XY, XZ, YZ, XYZ | Z (Vertical) |
| Quick-Connect Dovetail | 2" Dovetail | 3" Dovetail | |||
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| Rotation and Goniometric Stages | |||
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| Items | Compact Rotation Stage | Compact Goniometric Stages | Full-Size Rotation Stage |
| Motion | 360° Rotation | ±8° Tip/Tilt About Fixed Point Above Stage | 360° Rotation |
| Quick-Connect Dovetail | 2" Dovetail | 3" Dovetail | |
| Additional Features | |
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| Stage Adapters | ||
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| Z-Axis Assembly Kits |  |
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| Compact Z-Axis Assembly Kits, 2" Dovetails |
Full-Size Z-Axis Assembly Kits, 3" Dovetails |
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| Parallel Mounting Adapters |
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| Parallel Mounting Adapter, Male 2" Dovetail to Female 3" Dovetail |
Parallel Mounting Adapter, Male 3" Dovetail to Female 3" Dovetail |
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| Perpendicular Mounting Adapter |
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| Perpendicular Mounting Adapter Male 2" Dovetail to Female 3" Dovetail | ||
| Dovetail Accessories | ||
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| Mounting Platforms |  |
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| 2" Mounting Platforms | 3" Mounting Platforms | |
| Rail Positioners |  |
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| 2" Rail Positioners | 3" Rail Positioners | |
| Dovetail Bases | |||
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| 2" Dovetail Base Plate | 3" Dovetail Base Plate with Rotational Adjustment | ||
| Rails / Extended Bases |
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| 2" Dovetail Rails | 3" Dovetail Rails | ||
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XRNR1/M Rotating World Features
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XRNR1 Rotating World Features
- Coarse Manual Rotation and ±5° Fine Adjustment
- Rotation Locking Screw with 5/64" (2.0 mm) Hex
- Four Slots for Breadboard Mounting with 1/4"-20 (M6) Screws
- Directly Compatible with XRN25 Series Compact Translation Stages Using 2" Mating Dovetail
- Do Not Exceed 15 in•lbs of Torque when Tightening Clamping Arm
- XRN-A1 Adapter (Sold Separately) Enables Compatibility with XR25 and XR50 Series Translation Stages
The XRNR1(/M) Compact Rotation Stage provides 360° of continuous manual rotation and features a side-mounted fine adjuster screw which rotates the platform 8.33 mrad (0.477°) per revolution. The top plate of each stage is tapped with an array of mounting holes as illustrated in the diagrams on the right.
This stage and our other compact stages with integrated 2" mating dovetails can be easily stacked and secured to one another. The stages are secured by a single dovetail locking mechanism with a 3/16" (5 mm) hex. The mating dovetail also allows this stage to be used with the variety of accessories below.
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- Kits Consist of Angle Bracket and Mounting Plate
- Support Vertical Mounting Configurations
- Compatible with 3" Mating Dovetail Stages
- Dovetail Clamp Screw has a Max Torque of 15 in•lbs
The XRN-XZ(/M) and XRN-YZ(/M) Assembly Kits enable vertical mounting of an XRNR1(/M) Rotation Stage. These assembly kits can be directly mounted onto a base plate or onto our XRN25 Series Compact Translation Stages, as illustrated in the photos to the right. When used to mount the rotation stage vertically on a linear translation stage, the XRN-XZ kit positions the surface of the rotation stage parallel to the direction of linear motion, while the XRN-YZ kit would orient the rotation stage platform perpendicular to the direction of motion.
Each kit includes an angle bracket and a mounting plate. The female dovetail on the rotation stage attaches to one of the mounting plate's male dovetails. The mounting plate's other male dovetail is then mated to an arm of the angle bracket. The other arm of the angle bracket attaches to the base plate or translation stage.
Zoom| Mounting Adapter Compatibility | |||
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| Item # | Orientation | Top Component | Bottom Component |
| XRN-A1 | Perpendicular | XRN25 Series XRNV1 Series XRNR1 Series XRNG1 Series |
XR25 Series XR50 Series XRV1 Series XRR1 Series |
| XRN-A2 | Parallel | ||
- XRN-A1 Adapter Enables Perpendicular Mounting of 2" Dovetail Components onto 3" Dovetail Components
- XRN-A2 Adapter Enables Parallel Mounting of 2" Dovetail Components onto 3" Dovetail Components
- Adapters Add 0.275" (7.0 mm) to the Overall Stacked Height of Components
These adapters enable mounting of quick-connect, crossed-roller bearing stages or accessories with a female 2" dovetail to components with a male 3" dovetail. The XRN-A1 adapter enables perpendicular mounting while the XRN-A2 enable parallel mounting.
To assemble, first loosen the dovetail locking screw on the end of the top stage or accessory. Position the adapter on the bottom stage or rail then align the top component on the adapter. Lastly, tighten the dovetail locking screw (maximum torque: 15 in•lbs) on the end of the top component until the entire assembly is secure. Please note that the deep-set screws in the sides of the adapter are not user adjustable.
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Stages can be mounted vertically using a vertical assembly kit and the XRN-B1 base plate.
- 1.26" Long, 1/4" (M6) Counterbored Slots for Additional Mounting Flexibility
- Orthogonal Male Dovetails for Two Stage Mounting Orientations
- Compatible with 2" Mating Dovetail Stages
The XRN-B1(/M) baseplate offers additional mounting flexibility for coarse positioning of the XRNR1(/M) rotation stage within a setup. Three 1.26" long, 1/4" (M6) counterbored slots allow for coarse translation adjustment of the stage. The orthogonal dovetails on the top of the XRN-B1 allow the stage to be mounted in two orientations. The middle slot is designed to be secured by two 1/4"-20 (M6) cap screws onto an optical table or breadboard, which allows the stage to be aligned with the table's or breadboard's hole pattern.
Vertical Stage Configuration
For situations where a vertically mounted rotation stage is needed, either the XRN-XZ or the XRN-YZ angle bracket (sold above) can be secured directly to the baseplate. This configuration is illustrated in the photo to the right and described in more detail in the Vertical Assembly Kits section above.
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Mechanical Drawings
- Provide Clamping Force for Our Platform Mounts
- Threaded Hole on Top and Threaded Stud on Bottom of Post
- 6-32 Threads on PM3 and PM4
- 8-32 Threads on PM5
- M4 x 0.7 Threads on All Metric Versions
- Maximum Optic Heights from 0.97" to 1.65" (24.6 mm to 41.8 mm)
- Extension Posts Available to Increase Max Optic Height
- PM3SP(/M) with PM3(/M): Hold Optics up to 2.21" (56.1 mm) Tall
- PM4SP(/M) with PM4(/M): Hold Optics up to 3.61" (91.7 mm) Tall
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Clamping Arm Extension Posts with Metric Indicator Groove
Thorlabs' Clamping Arms provide clamping force to secure optics to our kinematic platform mounts, stages, and V-clamps. The PM3(/M) accommodates optics up to 0.97" tall and features a 0.69" center-to-center distance between the post and the nylon-tipped setscrew that holds the optic. The PM4(/M) accommodates optics up to 1.61" and features a 1.16" center-to-center distance between the post and the nylon-tipped setscrew. The maximum optic height of the PM3(/M) or PM4(/M) Clamping Arms can be extended using our PM3SP(/M) or PM4SP(/M) Extension Posts, respectively. These extension posts are identical to the posts included in each complete clamping arm. Each clamping arm features 6-32 (M4 x 0.7) threads. The PM3 and PM4 can be mounted in 8-32 tapped holes by using the AS6E8E thread adapter, which features internal 6-32 threads and external 8-32 threads. This thread adapter has an outer diameter of 0.24", which is the same as the PM4SP extension post and the post included with the PM4 clamping arm. This allows the clamping arm to be adjusted across the seam between either post and the adapter. The smaller diameters of the included post for the PM3 clamping arm and the PM3SP extension post cause the thread adapter to act as a stop for the clamping arm.
The PM5(/M) clamping arm is made entirely from heat-treated stainless steel, which helps maintain stability in fluctuating temperatures and provides vacuum compatibility. This clamping arm is recommended for use with the POLARIS-K1M4(/M), but it can be used with any platform mount or stage that has one or more 8-32 (M4 x 0.7) tapped holes. The PM5(/M) can hold optics up to 1.65" tall, and the distance from the post center to the contact point that holds the optic is 0.90".
Each clamping arm is attached to its post using a flexure mechanism that locks with a 5/64" (2.0 mm) balldriver or hex key. The setscrew on top of the clamping arm also accepts a 5/64" (2.0 mm) balldriver or hex key in order to clamp down on the optic. The post includes a through hole which can be leveraged for added torque when tightening down the post. Please see the diagram above for additional information.
Compact Rotation Stage w/ Crossed-Roller Bearings