DescriptionSpecifications
Models
Catalog PDF
The SR50 and PR50 Series compact rotation stages are designed to rotate optical components up to 1 in. diameter, such as polarizers, wave plates, or wedges. The small size allows use in confined spaces, such as laser cavities, disk texturing machines, or manufacturing areas for fiber optical components.
The lightweight, low profile design incorporates an aluminum body with pre-loaded ball bearings. This proprietary ball bearing design provides smooth rotation with minimal wobble. A precision ground worm gear produces consistent driving torque to the rotating carriage and eliminates variations in motor current. The motor is folded inside the stage body to give an extremely small footprint for a stage at this level of precision.
All SR50 stages feature an angular resolution of 0.001°, which may be achieved with either DC Servo or open-loop stepper motors in half-step mode. The stages are equipped with a hardware origin allowing the stage to return to a reference home position to within 0.01°. SR50 stages can run in continuous rotation mode.
The PR50 stages are a cost-efficient alternative to the SR50 for applications that do not require the high-resolution and precision of the SR50, or for applications that could benefit from higher speeds up to 20°/s. The PR50 stages feature angular resolution of 0.01°, which may be achieved with either DC Servo or open-loop stepper motors in half-step mode. The stages are equipped with a hardware origin and allow for continuous rotation of 360°. |
Interface |
The central aperture is threaded 1.063-20 in. SR50 and PR50 stages are shipped with two, same diameter retaining rings to allow mounting of any ø25.4 mm diameter optics within the aperture. Four M3 holes allow for attachment of custom top plates. |
Note |
Due to its very low profile, the PR50 and SR50 stages contain pressure sensitive components. For use at a pressure level below 0.25 bar, please contact our sales department. |
Accessories |
The EQ45 bracket can be used for vertical mounting of a PR50 or SR50 stage. |
EQ45 Bracket
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Two PR50 stages and one EQ45.
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Design Details
| SR50 Series | PR50 Series |
| Base Material | Aluminum | Aluminum |
| Bearings | Ball bearings | Ball bearings |
| Drive Mechanism | Ground worm gear | Ground worm gear |
| Worm Gear Ratio | 1:70 | 1:63 |
| Reduction Gear | 107.143:1 | 11.8642:1 |
| Feedback | SR50CC: Motor mounted rotary encoder, 48 pts/rev SR50PP: Open-loop, no encoder | PR50CC: Motor mounted rotary encoder, 48 pts/rev PR50PP: Open-loop, no encoder |
| Origin | Optical | Optical |
| Motor | SR50CC: UE16CC SR50PP: UE16PPSC, 1 Full step = 0.002° | PR50CC: DC servo motor UE17CC PR50PP: 2-phase stepper motor UE16PPSC, 1 Full step = 0.02° |
| Cable (m) | 3 |
| MTBF (h) | 10,000 |
| Weight [lb (kg)] | 0.7 (0.3) | 0.8 (0.4) |
Specifications
| SR50 Series | PR50 Series |
| Travel Range (°) | 360 continuous | 360 continuous |
| Resolution (°) | 0.001(1) | 0.01(1) |
| Minimum Incremental Motion (°) | 0.004 | 0.02 |
| Uni-directional Repeatability (°) | 0.003 typical, 0.01 guaranteed | 0.02 typical, 0.05 guaranteed |
| Reversal Value (Hysteresis) (°) | 0.02 typical, 0.04 guaranteed | 0.03 typical, 0.1 guaranteed |
| Absolute Accuracy (°) | 0.035 typical, 0.06 guaranteed | 0.05 typical, 0.1 guaranteed |
| Maximum Speed (°/s) | 4(2) | 20(2) |
| Wobble (µrad) | 40 typical, 100 guaranteed | 40 typical, 100 guaranteed |
See the Motion Control Metrology Primer section (see Motion Control Metrology Primer) for more information on typical and guaranteed specifications
1) Equal to one half-step on SR50PP and PR50PP
2) Max. speed with SMC100PP: 8°/s for PR50PP and 1.6°/s for SR50PP
Hysterisis plot for SR50 Series stages. The typical (mean) hysterisis is 0.02 °. The guaranteed value is 0.04 °.
Absolute accuracy plot for SR50 Series stages. The typical (mean) absolute accuracy is 0.035 °. The guaranteed value is 0.06 °.
Uni-directional repeatability plot for SR50 Series stages. The typical (mean) Uni-directional repeatability is 0.003 °. The guaranteed value is 0.01 °.
Wobble plot for SR50 Series stages. The typical (mean) wobble is 40 µrad. The guaranteed value is 100 µrad.
Load Characteristics
| SR50 Series | PR50 Series |
| Cz, Normal centered load capacity (N) | 30 | 10 |
| a, Construction parameter (mm) | 25 | 22 |
| kα, Transversal compliance (µrad/Nm) | 160 | 100 |
| Mz, Nominal torque (Nm) | SR50CC: 0.4 SR50PP: 0.5 | 0.1 |
| Q, Off-center load | Q ≤ Cz/(1 + D/a) |
| D, Cantilever distance in mm |
Also applicable to the PR50 Series
| | Model | Description |
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EQ45
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Right-Angle Bracket for PR50 and SR50
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PR50CC
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Compact Rotation Stage, 360°, DC Servo Motor, PR Series
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PR50PP
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Compact Rotation Stage, 360°, Micro Step Drive Stepper, PR Series
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SR50CC
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Compact Rotation Stage, 360°, DC Servo Motor, SR Series
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SR50PP
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Compact Rotation Stage, 360°, Micro Step Drive Stepper, SR Series
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