RadGauge-X (High-Precision Radius Gauge)

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 RadGauge-X — High-Precision Radius Gauge

(3D-Printed + MR74ZZ Bearing + Anti-Play Spring System)

RadGauge-X is an upgraded version of my original RadGauge — a compact radius-measuring tool that converts linear motion into smooth angular displacement.
The new X-model focuses on eliminating assembly tolerance and mechanical play, significantly improving precision and user feel.

🔧 What’s New

✅ MR74ZZ bearing indicator
– Integrates a 4×7×2.5 mm ball bearing inside the pointer
– Provides ultra-smooth, low-friction rotation with near-zero axial play

✅ Spring-wing preload structure
– Eliminates side-to-side slack in the slider
– Maintains consistent pressure without needing printed tolerances

✅ Reduced measurement error
– Original RadGauge error: ≤ ±0.3 mm
– RadGauge-X error: ≤ ±0.1 mm
 

✅ Print-friendly design
– All parts optimized for FDM
– No supports required
– Fast assembly

⚠️ Notes

• Since gear teeth are 3D-printed, tiny backlash inevitably exists

• Accuracy improves significantly with good printer calibration

   

🪄 Why This Version Exists

The original RadGauge worked well, but full 3D-printed tolerance sometimes caused small errors depending on print quality.
RadGauge-X removes most of that play using:

• Spring tensioned rails, and
• A real ball-bearing pivot

The result is measurably better repeatability and a much more satisfying mechanical feel.

🙌 Acknowledgements

Thanks to everyone who shared print feedback on earlier RadGauge models.
Your comments led directly to this refined X-version — smoother, tighter, and more accurate.

Enjoy, and share your makes!

If this model receives a lot of positive reviews, I plan to create upgraded versions of the same concept in other sizes.

🔧Assemble Layout

Assemble at 50mm measure setting

After aligning the parts as shown below, place the front cover horizontally in the correct position, cover it with something wide and solid like a ruler, and press firmly to allow easy and accurate assembly without damaging the parts.

1. General Licensing Statement

This model is copyrighted and its commercial use is strictly prohibited.
This falls under the Non-Commercial (NC) condition of the Creative Commons license.

2. Specific Prohibition on Reproduction Services

PROHIBITION OF PRINTING SERVICES: Providing this model file to any third party for the purpose of paid reproduction (printing) is strictly prohibited.
PERSONAL USE ONLY: All reproduction must be conducted solely on the end-user's personally owned 3D printer.
This license condition forbids the use of printing services, even for a single personal copy.

⚠️ Official Notice Regarding RadianLab Model
This model is exclusively manufactured and distributed under the RadianLab brand.

The unauthorized sale of this product by any other individual or entity is strictly prohibited and constitutes a violation of my brand rights. I require that any instances of unauthorized distribution or sales be reported to me immediately.

Product Information:

While the products currently sold maintain the fundamental design, they incorporate additional proprietary structures engineered for superior accuracy and usability (user experience). Furthermore, every unit undergoes a rigorous quality control inspection before being offered for sale.

the Original RadGauge Family

Hope you Enjoy this model.

As always, I welcome your feedback.

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