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  3. OPTOSIGMA GOH-65A50-M6

OPTOSIGMA GOH-65A50-M6 Goniometer Dovetail Deg Radius Worm Goh Gear 65X65MM 1-AXIS /-20 50MM

Goh-65a50-m6 Optosigma 65x65mm Goniometer Brass Dovetail 1-axis /-20 Deg 50mm Radius Worm-gear

( Brand: Optosigma ), ( Manufacturer Part Number: GOH-65A50-M6 ), ( Model: GOH-A ), ( Type: Goniometer ), ( Unit Type: Unit ), ( Unit Quantity: Ea )

Review OPTOSIGMA 65x65mm Goniometer Brass Dovetail 1-axis /-20 Deg 50mm Radius Worm gear

The **OptoSigma GOH-65A50-M6 65 65 mm Goniometer** is a precision-engineered, single-axis rotational stage designed for applications requiring high accuracy, smooth motion, and robust mechanical stability. Built with a compact yet sturdy **65 65 mm dovetail base**, this goniometer offers a compact footprint ideal for integration into optical benches, microscopy setups, or automated measurement systems where space efficiency is critical. The **M6 threaded mounting interface** ensures seamless compatibility with standard optical mounts, allowing for quick and secure attachment to microscopes, cameras, or other optical instruments. With a **worm-gear drive mechanism**, the stage delivers smooth, backlash-free rotation over a ** 20-degree range**, making it well-suited for applications in spectroscopy, interferometry, or alignment tasks where precise angular adjustments are essential.

The **50 mm radius of rotation** provides a generous working distance, accommodating a wide variety of optical components while minimizing shadowing or obstruction. The worm-gear design not only reduces friction but also enhances positional repeatability, ensuring consistent performance over repeated adjustments. The dovetail base not only reinforces structural rigidity but also allows for precise alignment along two perpendicular axes, further improving stability during high-precision operations. Whether used in research laboratories, industrial metrology, or optical testing environments, this goniometer offers a reliable solution for applications demanding fine angular control with minimal mechanical play. Its durable construction and precise engineering make it a versatile choice for both static and dynamic alignment tasks, where accuracy and repeatability are paramount.

The OptoSigma GOH-65A50-M6 goniometer is a precision mechanical component designed for rotational positioning applications, particularly in optical, robotic, or automated systems. Below is a detailed analysis of its pros and cons, followed by a conclusion and recommendation.

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### **Pros of the OptoSigma GOH-65A50-M6 Goniometer**

1. **High Precision and Repeatability**

The goniometer features a worm-gear mechanism, which is known for its smooth, low-backlash operation. This ensures high angular precision and repeatability, critical for applications requiring consistent positioning (e.g., optical alignment, scanning, or robotic manipulation). The 1-axis design simplifies control and reduces complexity compared to multi-axis systems.

2. **Compact and Lightweight Design**

With dimensions of 65x65 mm, the goniometer is relatively compact for its functionality. This makes it suitable for applications where space is limited, such as in optical benches, small robotic arms, or portable setups. The lightweight construction also reduces inertia, allowing for faster acceleration and deceleration in dynamic applications.

3. **Durable Construction**

The M6 dovetail mounting system provides robust mechanical stability, allowing for secure integration into larger systems. The worm-gear drive is typically designed for longevity, reducing wear over extended use. The 50 mm radius likely contributes to a balanced and stable rotational motion, minimizing vibrations during operation.

4. **Wide Angular Range**

The specified range of -20 to 20 (40 total) is adequate for many applications, including optical beam steering, sample rotation in microscopy, or limited-angle scanning. While not as broad as some multi-axis goniometers, this range is sufficient for precise, localized adjustments.

5. **Compatibility with Standard Mounting Systems**

The M6 dovetail is a common mounting standard in optics and precision engineering, making it easy to integrate with other components like mounts, stages, or optical tables. This compatibility reduces the need for custom adapters and simplifies assembly.

6. **Low Friction and Smooth Operation**

Worm-gear mechanisms are inherently low-friction, which translates to smoother motion and less energy loss during operation. This is particularly beneficial for applications requiring fine adjustments or continuous scanning.

7. **Cost-Effective for Specific Applications**

For applications requiring only a single axis of rotation with moderate angular range, this goniometer offers a balance between performance and cost. It may be more economical than purchasing a full multi-axis system or a higher-end single-axis goniometer with additional features.

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### **Cons of the OptoSigma GOH-65A50-M6 Goniometer**

1. **Limited Angular Range**

The 40 range (-20 to 20 ) is restrictive for applications requiring broader rotation, such as full 360 scanning or large-sample rotation. Users needing wider angles may require additional mechanisms or multiple goniometers, increasing complexity and cost.

2. **Single-Axis Only**

The goniometer is designed for one axis of rotation, which limits its versatility. Applications requiring multi-axis motion (e.g., 2D or 3D positioning) would need to combine this with additional components, such as another goniometer or linear stages, adding to the system s size, cost, and control complexity.

3. **Manual or Limited Automation**

While the worm-gear mechanism is precise, it may not be motorized or integrated with automated control systems out of the box. Users requiring motorized operation would need to purchase an additional motor, encoder, and controller, adding to the overall system cost and integration effort. The lack of built-in feedback (e.g., encoder) means manual adjustments or external positioning systems may be necessary for closed-loop control.

4. **Potential Backlash**

Although worm-gear mechanisms are low-backlash, some residual backlash may still exist, especially in lower-quality or less precisely manufactured units. This could affect the accuracy of rapid position changes or high-precision applications. Users should verify the backlash specifications or test the unit before critical applications.

5. **No Built-In Indexing or Zero-Position Reference**

Without a built-in indexing mechanism or reference mark, achieving consistent starting positions (e.g., for repeatable measurements) may require additional hardware or software solutions. This could add complexity to automated workflows.

6. **Load Capacity Limitations**

The goniometer s load capacity isn t explicitly stated in the description, but worm-gear mechanisms typically have lower load-bearing capabilities compared to other drive types (e.g., ball screws or direct drives). Heavy or bulky payloads may require additional support or a different mechanical design.

7. **Compatibility with Motorization Requires Additional Components**

For motorized applications, users would need to source a compatible motor (e.g., stepper or servo), an encoder (if closed-loop control is desired), and possibly a custom coupling or adapter. This adds to the system s cost, assembly time, and potential for misalignment or integration issues.

8. **Limited Customization**

The goniometer is a standard product with fixed dimensions and range. Users with non-standard requirements (e.g., different mounting holes, angular range, or payload capacity) may find it unsuitable without modifications or additional components.

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### **Conclusion**

The OptoSigma GOH-65A50-M6 goniometer is a well-suited choice for applications requiring **high-precision, single-axis rotation within a limited angular range (-20 to 20 )**. Its compact size, durable construction, and compatibility with standard mounting systems make it practical for optical, robotic, or automated setups where space and precision are priorities. However, its **narrow angular range, lack of built-in motorization or feedback, and single-axis design** limit its applicability to broader or more complex motion requirements.

For users who need **only a single-axis rotation with fine adjustments**, this goniometer offers a cost-effective and reliable solution. In contrast, those requiring **multi-axis motion, broader angular ranges, or motorized control** would need to supplement it with additional components, potentially increasing complexity and cost.

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### **Recommendation**

**Buy the OptoSigma GOH-65A50-M6 goniometer if:**

- Your application requires **precise, single-axis rotation within -20 to 20 **.

- You are working in **optics, microscopy, or small-scale automation** where space and precision are critical.

- You plan to **manually adjust the position** or integrate it with an existing motorized system (e.g., by adding a separate motor and encoder).

- You need a **compact, lightweight, and durable** component with standard M6 dovetail mounting.

**Avoid or consider alternatives if:**

- You need **broader angular ranges** (e.g., 360 or more), in which case a multi-axis goniometer or rotary stage would be better.

- Your application requires **motorized or automated control**, as you would need to purchase additional components (motor, encoder, controller).

- You anticipate **heavy or bulky payloads**, as the worm-gear mechanism may not handle high loads efficiently.

- You need **multi-axis motion**, as combining this goniometer with additional stages would complicate the system.

**Alternative Considerations:**

- For **motorized single-axis rotation**, consider a **motorized goniometer** from brands like Thorlabs, Newport, or Physik Instrumente, which include built-in motors and encoders.

- For **broader angular ranges**, explore **rotary stages** or **multi-axis goniometers** with larger ranges (e.g., 0 to 360 ).

- For **higher load capacities**, evaluate **ball-screw-driven or direct-drive rotary stages**, which offer better load-bearing capabilities.

Details:

This GOH-A dovetail goniometer is made from solid brass and 65-mm square platform size. It is made for supporting large loads up to 10kg and driven by a high-tolerance worm-gear mechanism which yields angular position readable less than 12 arc minutes using the vernier scale. Angle Range: 20. Rotation height : 50 0.1mm.

part #: goh65a50m6 price

  • $289.00

specifications linactuat:

  • brand: Optosigma
  • mpn: Goh-65a50-m6
  • model: Goh-a
  • type: Goniometer
  • unit type: Unit
  • unit quantity: Ea

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general linactuat:

  • Industrial Automation Motion Controls > Rotary Linear Motion > XY Rotary Positioning Stages
  • condition: Used

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  • started: March 7, 2026
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type: goniometer, unit type: unit, unit quantity: ea,
category: business & industrial > industrial automation motion controls > rotary linear motion > xy rotary positioning stages, sku: 14114371041231881,
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