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Continuous Rotation Mounts


  • Fine Pitch Worm Gear Provides 360° Continuous Rotation
  • Compatible with Prism Mounting Hardware
  • Vernier Scale Offers 5 arcmin Resolution

CR1

Continuous Rotation Stage

CR1A

General-Purpose Adapter Plate

PM3

PM4

Related Items


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CR1, Continuous Rotation Mount
Click to Enlarge

An MS1 Translation Stage is Mounted onto an CR1 Rotation Stage through two clearance holes for 4-40 cap screws.

Features

  • Vernier Scale Offers a Resolution of 5 arcmin
  • 360° Continuous Motion Provided by Fine Pitch Worm Gear
  • Backlash Free
  • 25 lb Load Capacity with Stage Mounted on a Horizontal Surface
  • Designed for Mounting MS1 and T12 Series Translation Stages (Using the CR1A Adapter Plate)
  • Compatible with PM3/PM4/PM5 Prism Mounting Hardware (See Below)

The CR1 rotation stage includes a fine pitch worm gear that provides high precision and backlash-free rotation achieved by the worm gear driven design. Rotation is actuated via a stainless adjuster knob located on the side of the unit. The rotating platform contains an array of 8-32 (M4), 6-32, and 4-40 tapped holes for general mounting requirements. Two radially shaped 1/4" (M6) slots machined in the base provide flexible mounting options and are spaced for compatiblity with imperial and metric optical tables and breadboards.

The easy-to-read radial scale is marked in 2° increments and labeled every 10°. A side-located vernier scale improves resolution to 5 arcmin. The added ability to stack some of our translation stages on the rotation platform, and its 25 lbs capacity, make this stage useful in any laboratory.

CR1 SmartPack Packaging
Click to Enlarge

CR1 Packaging

Smart Pack

Item # % Weight
Reduction
CO2-Equivalent
Reductiona
CR1 40.48% 9.07 kg
CR1/M 40.48% 12.25 kg

Smart Pack

  • Reduce Weight of Packaging Materials
  • Increase Usage of Recyclable Packing Materials
  • Improve Packing Integrity
  • Decrease Shipping Costs

Thorlabs' Smart Pack Initiative is aimed at waste minimization while still maintaining adequate protection for our products. By eliminating any unnecessary packaging, implementing packaging design changes, and utilizing eco-friendly packaging materials for our customers when possible, this initiative seeks to improve the environmental impact of our product packaging. Products listed above are now shipped in re-engineered packaging that minimizes the weight and the use of non-recyclable materials.b As we move through our product line, we will indicate re-engineered packages with our Smart Pack logo.

  • Travel-based emissions reduction calculations are estimated based on the total weight reduction of packaging materials used for all of 2013’s product sales, traveling 1,000 miles on an airplane, to provide general understanding of the impact of packaging material reduction. Calculations were made using the EPA’s shipping emissions values for different modes of transport.
  • Some Smart Pack products may show a negative weight reduction percentage as the substitution of greener packaging materials, such as the Greenwrap, at times slightly increases the weight of the product packaging.
Figure 1: Vernier scale measuring 76.0
Click to Enlarge

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 tool measures).

Reading a Vernier Scale

Vernier scales are typically used to add precision to standard, evenly divided scales (such as the scale on Thorlabs’ rotation mounts). A vernier scale has found common use in many precision measurement tools, the most common being calipers and micrometers. The direct vernier scale uses two scales side-by-side: the main scale and the vernier scale. The vernier scale has a slightly smaller spacing between its tick marks (10% smaller than the main). 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 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 tool.

The 0 on the vernier scale is the “pointer” (marked by a red arrow in Figs. 1 – 3) 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 vernier 0 lines up with the main scale’s 75.6, the reading from Figure 1 is 75.60 (in whatever units the tool measures in).

That is essentially all there is to reading a vernier scale. It's a very straightforward way of increasing the precision of a measurement tool. To expound, let’s look at Figure 2. Here we see that the pointer is no longer aligned with a scale line, instead it is slightly above 75.6, but 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 the vernier scale is 10% smaller than the main scale, moving 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 7 (marked with a blue arrow) is very closely aligned to the main scale, giving a precision measurement of 75.67. However, the vernier 7 is very slightly above the main scale mark, and we can see that the vernier 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 tool.

As we've seen here, vernier sclaes 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. All vernier scales, direct or retrograde, are read in the same fashion.

Figure 1: Vernier scale measuring 76.0
Click to Enlarge

Figure 2: An Example of a vernier scale. The red arrow indicates the pointer and the blue arrow indicates the vernier line that matches the main scale. This scale reads 75.65.
Figure 1: Vernier scale measuring 76.0
Click to Enlarge

Figure 3: An Example of a vernier scale. 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.

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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, or an Elliptec™ resonant piezo motor. Each offers 360° of continuous rotation.

Manual Rotation Mounts

Rotation Mounts for Ø1/2" Optics
Item # MRM05(/M) RSP05(/M) CRM05 PRM05(/M)a SRM05 KS05RS CT104
Click Photo
to Enlarge
Features Mini Series Standard External SM1
(1.035"-40) Threads
Micrometer 16 mm Cage-Compatible ±4° Kinematic Tip/Tilt Adjustment Plus Rotation Compatible with CT1 Cage Translator Stage and 1/4" Translation Stagesb
Additional Details
  • This mount is available in the PRM05GL5 bundle, which includes the PRM05 rotation mount with the SM05PM5 polarizing prism mount.
  • The CT104 is complatible with the 1/4" translation stages using our MS103(/M) adapter plate.
  • The CT104 is compatible with the CT1 cage translation stage, which is designed for use with 30 mm cage systems.

Rotation Mounts for Ø1" Optics
Item # RSP1(/M) LRM1 RSP1D(/M) DLM1(/M) CLR1(/M) RSP1X15(/M) RSP1X225(/M) PRM1(/M)a
Click Photo
to Enlarge
LRM1
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
  • This mount is available in the PRM1GL10 bundle, which includes the PRM1 rotation mount with the SM1PM10 polarizing prism mount.

Rotation Mounts for Ø1" Optics
Item # LM1-A &
LM1-B(/M)
CRM1(/M) CRM1L(/M) CRM1P KS1RS K6XS
Click Photo
to Enlarge
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
  • This mount also features four 4-40 (M3) holes on the rotation dial for use with the K6A1(/M) prism platform.

Rotation Mounts for Ø2" Optics
Item # RSP2(/M) RSP2D(/M) PRM2(/M) LM2-A &
LM2-B(/M)
LCRM2(/M) KS2RS K6X2
Click Photo to Enlarge
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

Manual Rotation Stages

Manual Rotation Stages
Item # RP005(/M) MSRP01(/M) RP01(/M) RP03(/M) QRP02(/M)
Click Photo
to Enlarge
Continuous Rotation Mount
Features Standard Two Hard Stops
Additional Details

 

Manual Rotation Stages
Item # XRR1(/M) PR01(/M) CR1(/M) XYR1(/M) OCT-XYR1(/M)
Click Photo
to Enlarge
Features 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
  • The stage profile is higher when it is mounted using the screw slots rather than stacked on another stage or accessory with 3" dovetails.
  • The OCT-XYR1(/M) stage includes the XYR1A solid sample plate. This plate can be detached from the stage to reveal the same mounting features present on the XYR1(/M) stage.

Motorized Rotation Mounts and Stages

Motorized Rotation Mounts and Stages
Item # DDR25(/M) K10CR1(/M) PRM1Z8(/M)a PRMTZ8(/M)b DDR100(/M) HDR50(/M) ELL18(/M)c
Click Photo
to Enlarge
Features Compatible with
SM05 Lens Tubes,
16 mm Cage System,
30 mm Cage System
Compatible with SM1 Lens Tubes and
30 mm Cage System
Tapped Mounting Platform for Mounting Prisms or Other Optics Compatible with
SM1 Lens Tubes,
16 mm Cage System,
30 mm Cage System
Compatible with
SM2 Lens Tubes
Tapped Mounting Platform, Open Frame Design for OEM Applications
Additional Details
  • This stage is available in the KPRMTE(/M), which includes the PRMTZ8(/M) Motorized Rotation Stage with the KDC101 K-Cube DC Servo Motor Controller.
  • This stage is available in the KPRM1E(/M), which includes the PRMT1Z8(/M) Motorized Rotation Stage with the KDC101 K-Cube DC Servo Motor Controller.
  • This stage is available in the ELL18K(/M), which includes an interface board, mounting brackets, and connectors for PC control.

Continuous Rotation Mounts

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Imperial Price Available
CR1 Support Documentation
CR1Continuous Rotation Stage
$347.36
Today
+1 Qty Docs Part Number - Metric Price Available
CR1/M Support Documentation
CR1/MContinuous Rotation Stage - Metric
$347.36
Lead Time

Rotation Stage Adapter

CR1A, Continuous Rotation Mount Adapter
Click to Enlarge

A CR1A Adapter is used to secure a T12X Mini Translator onto a CR1 Rotation Stage using two 2-56 (M2) cap screws.

The CR1A adapter can be used to secure select Thorlabs mounts to the CR1 Rotation stage. The adpater is equipped with four 6-32 (M4) taps, one 1/4"-20 (M6) tap, six 4-40 taps (two 4-40 and four M3 on the metric version), eight 2-56 taps (four 2-56 and four M2 on the metric version), and four #6 (M4) clearance holes. The following table lists mounts that may be secured to the the CR1.

The CR1A adapter is attached to the CR1 stage via the #6 (M4) clearance holes with four 6-32 (M4) cap screws (included). The photo to the right shows a T12X translation stage mounted on the CR1A adapter through two #2 (M2) clearance holes in the bottom of the T12X stage.

Mount Description
PM3(/M), PM4(/M), and PM5(/M) Clamping Arms
PH Series Post Holders
T12 Series 1/2" Mini Translators
GN Series* Small Platform Goniometers*

* Note: The CR1A adapter plate is not compatible with our GNL series Large Platform Goniometers.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Imperial Price Available
CR1A Support Documentation
CR1ACR1 Adapter Plate
$26.51
Today
+1 Qty Docs Part Number - Metric Price Available
CR1A/M Support Documentation
CR1A/MCR1/M Adapter Plate
$26.51
Today

Clamping Arms


Click for Details

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 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

Click to Enlarge

Clamping Arm Extension Posts with Metric Indicator Groove

Thorlabs' Clamping Arms provide clamping force to secure optics to our kinematic platform mounts 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) 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 that has one or more 8-32 (M4) 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.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Imperial Price Available
PM3 Support Documentation
PM3Small Adjustable Clamping Arm, 6-32 Threaded Post
$19.91
Today
PM3SP Support Documentation
PM3SPCustomer Inspired! Extension Post for PM3 Clamping Arm, 6-32 Threaded
$5.52
Today
PM4 Support Documentation
PM4Large Adjustable Clamping Arm, 6-32 Threaded Post
$24.35
Today
PM4SP Support Documentation
PM4SPCustomer Inspired! Extension Post for PM4 Clamping Arm, 6-32 Threaded
$5.52
Today
PM5 Support Documentation
PM5Stainless Steel Adjustable Clamping Arm, 8-32 Threaded Post
$60.47
Today
+1 Qty Docs Part Number - Metric Price Available
PM3/M Support Documentation
PM3/MSmall Adjustable Clamping Arm, M4 Threaded Post
$19.91
Today
PM3SP/M Support Documentation
PM3SP/MCustomer Inspired! Extension Post for PM3/M Clamping Arm, M4 Threaded
$5.52
Today
PM4/M Support Documentation
PM4/MLarge Adjustable Clamping Arm, M4 Threaded Post
$24.35
Today
PM4SP/M Support Documentation
PM4SP/MCustomer Inspired! Extension Post for PM4/M Clamping Arm, M4 Threaded
$5.52
Today
PM5/M Support Documentation
PM5/MStainless Steel Adjustable Clamping Arm, M4 Threaded Post
$60.47
Today
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