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Motorized Precision Rotation Stage with DC Servo Motor


  • Continuous 360° Motorized Rotation
  • Rotational Velocity: 25 Degree/Second
  • Tapped Platform for Mounting Prisms or Other Optics

PRMTZ8

Motorized Continuous
Rotation Stage

Application Idea

PRMTZ8 with PM3 Clamping Arm
and Pellin Broca Prism

Related Items


Please Wait
Key Specificationsa
Platform Size Ø66.2 mm (2.61")
Platform Mounting Holes Eight 6-32 (M4)
Sixteen 8-32 (M4)
Five 1/4"-20 (M6)
Bidirectional Repeatability ±0.1°
Backlash ±0.3°
Max Rotation Velocity 25 deg/sec
Horizontal On-Axis Load Capacityb 15 N (1.5 kg, 3.4 lbs)
Repeatable Incremental Motion (Min) 0.04°
Percentage Accuracy 0.1%
Home Location Accuracy ±0.2°
Range 360° Continuous
  • See the Specs tab for complete specifications.
  • The PRMTZ8 is not suitable for mounting vertically.

Features

  • 25 deg/sec Rotation Velocity
  • Mounting Holes for Prism Clamps (Sold Below) or Other Optomechanics
  • 1° Graduations on Main Dial
  • Compact Design is Only 25 mm Tall
  • Home Limit Switch For Precise 0° Locating within ±0.2°
  • Recommended Driver: KDC101 DC Servo Controller

The PRMTZ8 is a compact, DC servo motorized 360° rotation stage with a tapped platform. The user can measure the angular displacement of the platform by using the Vernier scale (5 arcmin resolution) in conjunction with the graduation marks that are marked on the rotating platform in 1° increments. This rotation stage is also equipped with a home limit switch to facilitate automated rotation to the precise 0° position, allowing absolute angular positioning thereafter. The limit switch is designed to allow continuous rotation of the stage over multiple 360° cycles.

The KDC101 DC Servo Controller, sold separately below, is the ideal companion for achieving smooth, continuous motion that can be automated via the software interface. The stage, controller, and KPS101 power supply are sold together as the Item #s KPRMTE and KPRMTE/M.

The PRMTZ8 is supplied with 430 mm (16.93") of cable. An 2.5 m (8 ft) extension cable (PAA632) is available separately.

Motor Specifications
Motor Type DC Servo
Nominal Voltage 6 V
No Load Speed 6560 rpm
No Load Current 7.43 mA
Nominal Speed 1050 rpm
Nominal Torque (Maximum Continuous Torque) 1.26 mN•m
Nominal Current (Maximum Continuous Current) 0.156 A
Stall Torque 1.54 mN•m
Starting Current  0.184 A
Maximum Efficiency 65%
Terminal Resistance 32.7 Ω
Terminal Inductance 0.607 mH
Torque Constant 8.38 mN•m/A
Speed Constant 1140 rpm/V
Speed / Torque Gradient 4450 rpm/mN•m
Mechanical Time Constant 13.9 ms
Rotor Inertia 0.298 g•cm2
Stage Specifications
Translation and Motion Parameters
Travel Range 360° Continuous
Bidirectional Repeatabilitya ±0.1°
Backlashb ±0.3°
Max Rotation Velocity 25 deg/s
Calculated Resolution 2 arcsec (0.0005°)
Horizontal On-Axis Load Capacityc 15 N (1.5 kg, 3.4 lbs)
Min Repeatable Incremental Motiond 0.04°
Percentage Accuracy 0.1%
Home Location Accuracy ±0.2°
Wobble 200 µrad
Physical
Platform Size Ø66.2 mm (2.61")
Platform Mounting Holes Eight 6-32 (M4)
Sixteen 8-32 (M4)
Five 1/4"-20 (M6)
Dimensions 137.4 mm x 73.3 mm x 25 mm
(5.41" x 2.88" x 0.98")
Weight 0.38 kg (0.84 lbs)
Cable Length 430 mm (16.93")
  • The average of the repeatability when a set position is approached from both directions.
  • When a stage is moved to a position and then returned to its original position, some motion is lost due to the lead screw mechanism. This loss is known as backlash.
  • The PRMTZ8 is not suitable for mounting vertically.
  • The minimum incremental motion that the stage can repeatedly achieve within its standard error.

 

Motor Connector Pin Out

Connector
The PRMTZ8 is supplied with 430 mm (16.93") of cable. A 2.5 m (8 ft) extension cable (PAA632) is available separately.
Pin Description Pin Description
1 Ground/Return 9 Ident Resistora
2 Reserved For Future Use 10 Vcc/Ident Resistor
3 Limit Switch 11 Encoder Channel B
4 Reserved For Future Use 12 Reserved For Future Use
5 Motor (+) 13 Encoder Channel A
6 Reserved For Future Use 14 Ident EEPROM
7 Motor (-) 15 Ident EEPROM
8 Reserved For Future Use - -
  • Used to identify the stage when it is connected to a Thorlabs controller.

D-Type Male

Schematic

Thorlabs offers two platforms to drive our wide range of motion controllers: our Kinesis® software package or the legacy APT™ (Advanced Positioning Technology) software package. Either package can be used to control devices in the Kinesis family, which covers a wide range of motion controllers ranging from small, low-powered, single-channel drivers (such as the K-Cubes™ and T-Cubes™) to high-power, multi-channel, modular 19" rack nanopositioning systems (the APT Rack System).

The Kinesis Software features .NET controls which can be used by 3rd party developers working in the latest C#, Visual Basic, LabVIEW™, or any .NET compatible languages to create custom applications. Low-level DLL libraries are included for applications not expected to use the .NET framework. A Central Sequence Manager supports integration and synchronization of all Thorlabs motion control hardware.

Kinesis Software
Kinesis GUI Screen
APT Software
APT GUI Screen

Our legacy APT System Software platform offers ActiveX-based controls which can be used by 3rd party developers working on C#, Visual Basic, LabVIEW™, or any Active-X compatible languages to create custom applications and includes a simulator mode to assist in developing custom applications without requiring hardware.

By providing these common software platforms, Thorlabs has ensured that users can easily mix and match any of the Kinesis and APT controllers in a single application, while only having to learn a single set of software tools. In this way, it is perfectly feasible to combine any of the controllers from single-axis to multi-axis systems and control all from a single, PC-based unified software interface.

The software packages allow two methods of usage: graphical user interface (GUI) utilities for direct interaction with and control of the controllers 'out of the box', and a set of programming interfaces that allow custom-integrated positioning and alignment solutions to be easily programmed in the development language of choice.

A range of video tutorials is available to help explain our APT system software. These tutorials provide an overview of the software and the APT Config utility. Additionally, a tutorial video is available to explain how to select simulator mode within the software, which allows the user to experiment with the software without a controller connected. Please select the APT Tutorials tab above to view these videos, which are also available on the software CD included with the controllers.

Software

Kinesis Version 1.14.19

The Kinesis Software Package, which includes a GUI for control of Thorlabs' Kinesis and APT™ system controllers.

Also Available:

  • Communications Protocol
Software Download

Software

APT Version 3.21.4

The APT Software Package, which includes a GUI for control of Thorlabs' APT™ and Kinesis system controllers.

Also Available:

  • Communications Protocol
Software Download
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.

Posted Comments:
Sudhan Bhadade  (posted 2019-08-08 06:51:39.933)
Hello, I am using the KDC101 cube with .NET in Labview. I have established a connection with the Kinesis interface using the .dll files. When I attempt to connect to the cube, I receive an error saying "No suitable devices found." When I use the Kinesis app, I can connect with the cube and use all the functions to power a rotational stage, but it fails to connect to my Labview VI. Can I please get some help with this?
rmiron  (posted 2019-08-08 10:37:24.0)
Response from Radu at Thorlabs: Hello Sudhan. Have you set the SerialNumber property node before attempting to connect? If so, have you made sure to use KDC101's serial number?(as opposed to the stage's) Unfortunately, it sometimes (rarely) happens that the number printed on the cube is different from the one programmed into the unit. That is why it might be worth checking what serial number is shown by Kinesis. I will contact you directly in case these questions are not helpful.
paulbertier7  (posted 2018-04-13 14:20:09.58)
Hello, What is the minimum angle step? Cheers, Paul
bhallewell  (posted 2018-04-20 09:19:03.0)
Response from Ben at Thorlabs: Thank you for your feedback, Paul. We state a Minimum Repeatable Incremental Motion of 0.04 degrees in the specs table.
maheshswami  (posted 2018-02-15 02:02:56.527)
Does it have a through hole/clear axis if the tapped platform is removed.
bhallewell  (posted 2018-02-21 03:42:21.0)
Response from Ben at Thorlabs: The top plate is a feature of a single moving world assembly & so you can't remove the top plate & use the stage. This stage is designed as a rotation stage as opposed to an optics rotator. For a through hole option, I'd recommend taking a look at our PRM1Z8. https://www.thorlabs.com/newgrouppage9.cfm?objectgroup_ID=2875 Our K10CR1 stepper actuated optics rotator with integrated controller may also be of interest to you. https://www.thorlabs.com/newgrouppage9.cfm?objectgroup_ID=8750&pn=K10CR1

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) PR005(/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.

Motorized Rotation Stage

Rotation Stage Platform Mounting Taps
Click to Enlarge

PRMTZ8/M Platform Taps
Rotation Stage Platform Threads
Click to Enlarge

PRMTZ8 Platform Taps

The rotating platform features five 1/4"-20 (M6) tapped holes and sixteen 8-32 (M4) holes for general optomechanics, as well as eight 6-32 (M4) holes for compatibility with our PM3 and PM4 prism clamping arms (available below).

The PRMTZ8 is supplied with 16" (0.4 m) of cable. An 8 ft (2.5 m) extension cable (PAA632) is available separately.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Imperial Price Available
PRMTZ8 Support Documentation
PRMTZ8Motorized Precision Rotation Stage with Ø2.56" Platform (Imperial)
$945.26
Today
+1 Qty Docs Part Number - Metric Price Available
PRMTZ8/M Support Documentation
PRMTZ8/MMotorized Precision Rotation Stage with Ø65 mm Platform (Metric)
$945.26
Today

Motorized Rotation Stage and Controller

T-Cube Power Supply
Click to Enlarge

The KPRMTE(/M) includes the KPS101 Power Supply with a location-specific power adapter (not shown).

The KPRMTE(/M) bundle includes a PRMTZ8(/M) Motorized Rotation Stage with a KDC101 K-Cube™ DC Servo Motor Controller. This controller provides smooth, continuous motion that can be automated via the software interface. The bundle ships complete with a KPS101 power supply, which includes a location-specific adapter.

The KPRMTE(/M) is supplied with 16" (0.4 m) of cable. An 8 ft (2.5 m) extension cable (PAA632) is available separately.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Imperial Price Available
KPRMTE Support Documentation
KPRMTEMotorized Precision Rotation Stage with Ø2.56" Platform (Imperial) Bundled with DC Servo Motor Driver and Power Supply
$1,483.58
Today
+1 Qty Docs Part Number - Metric Price Available
KPRMTE/M Support Documentation
KPRMTE/MMotorized Precision Rotation Stage with Ø65 mm Platform (Metric) Bundled with DC Servo Motor Driver and Power Supply
$1,483.58
Today

K-Cube™ DC Servo Motor Controller

photo of power supply adaptersClick to Enlarge
View Product List
Item #QtyDescription
Product List
KCH6011USB Controller Hub and Power Supply for Six K-Cubes or T-Cubes
KDC1011K-Cube Brushed DC Servo Motor Controller (Power Supply Not Included)
KST1011K-Cube Stepper Motor Controller (Power Supply Not Included)
KPZ1011K-Cube Piezo Controller (Power Supply Sold Separately)
TSG0011 T-Cube Strain Gauge Reader (Power Supply Not Included)
TSC0011T-Cube Shutter Controller (Power Supply Not Included)
KAP1012Adapter Plate for KCH Series Hubs and 60 mm Wide T-Cubes
KCH601 USB Controller Hub (Sold Separately) with Installed K-Cube and T-Cube™ Modules (T-Cubes Require the KAP101 Adapter)
  • Front Panel Velocity Wheel and Digital Display for Controlling Motorized Stages or Actuators
  • Two Bidirectional Trigger Ports to Read or Control External Equipment
  • Interfaces with Computer Using Included USB Cable
  • Fully Compatible with Kinesis® or APT™ Software Packages
  • Compact Footprint: 60.0 mm x 60.0 mm x 49.2 mm (2.42" x 2.42" x 1.94")
  • Power Supply Not Included (See Below)

Thorlabs' KDC101 K-Cube Brushed DC Motor Controller provides local and computerized control of a single motor axis. It features a top-mounted control panel with a velocity wheel that supports four-speed bidirectional control with forward and reverse jogging as well as position presets. A backlit digital display is also included that can have the backlit dimmed or turned off using the top-panel menu options. The front of the unit contains two bidirectional trigger ports that can be used to read a 5 V external logic signal or output a 5 V logic signal to control external equipment. Each port can be independently configured.

The unit is fully compatible with our new Kinesis software package and our legacy APT control software. Please see the Motion Control Software tab for more information.

Please note that this controller does not ship with a power supply. Compatible power supplies are listed below. Additional information can be found on the main KDC101 DC Servo Motor Controller page.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
KDC101 Support Documentation
KDC101K-Cube Brushed DC Servo Motor Controller (Power Supply Not Included)
$677.41
Today

Compatible Power Supplies

photo of power supply adapters
Click for Details

A location-specific adapter is shipped with the power supply unit based on your location. The adapters for the KPS101 are shown here.
photo of power supply options
Click to Enlarge

The KPS101 Power Supply Unit
  • Individual Power Supply
    • KPS101: For K-Cubes™ or T-Cubes™ with 3.5 mm Jacks
  • USB Controller Hubs Provide Power and Communications
    • KCH301: For up to Three K-Cubes or T-Cubes
    • KCH601: For up to Six K-Cubes or T-Cubes

The KPS101 power supply outputs +15 VDC at up to 2.4 A and can power a single K-Cube or T-Cube with a 3.5 mm jack. It plugs into a standard wall outlet.

The KCH301 and KCH601 USB Controller Hubs each consist of two parts: the hub, which can support up to three (KCH301) or six (KCH601) K-Cubes or T-Cubes, and a power supply that plugs into a standard wall outlet. The hub draws a maximum current of 10 A; please verify that the cubes being used do not require a total current of more than 10 A. In addition, the hub provides USB connectivity to any docked K-Cube or T-Cube through a single USB connection.

For more information on the USB Controller Hubs, see the full web presentation.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
KPS101 Support Documentation
KPS10115 V, 2.4 A Power Supply Unit with 3.5 mm Jack Connector for One K- or T-Cube
$35.36
Today
KCH301 Support Documentation
KCH301USB Controller Hub and Power Supply for Three K-Cubes or T-Cubes
$524.83
Today
KCH601 Support Documentation
KCH601USB Controller Hub and Power Supply for Six K-Cubes or T-Cubes
$635.20
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, 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) 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) 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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