Brackets and mounts
SG90 2-DOF Robotic Arm Assembly
- Bounding box
- 228.2 × 60.0 × 240.7 mm
- Engine
- Precision B-rep
- Parameters
- 29
- Published
- August 7, 2026
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The prompt
"Design a compact, 3D-printable 2-DOF robotic arm specifically for a mobile library robot. The arm should consist of a rotating base joint, a lower link, an upper link, and a simple parallel jaw gripper. All joints must be designed for standard SG90 micro servos. The gripper fingers should be flat and wide (approx. 60mm) to safely push or grasp book spines without damaging them. Include a mounting plate at the base compatible with a standard servo horn. The design must be optimized for FDM 3D printing in PLA, with self-supporting angles where possible and 0.2mm clearance for servo shafts. The total reach should be approximately 250mm. Style: Functional, open-frame, lightweight.
Parameters
| Name | Value | Range |
|---|---|---|
| Plate Length | 60 mm | 40 – 100 |
| Plate Width | 60 mm | 40 – 100 |
| Plate Thickness | 5 mm | 3 – 10 |
| Bolt Circle Radius | 7.5 mm | 5 – 12 |
| Bolt Hole Diameter | 2.5 mm | 1.5 – 4 |
| Shaft Hole Diameter | 5.2 mm | 4.5 – 7 |
| Base Diameter | 50 mm | 30 – 70 |
| Base Height | 30 mm | 20 – 50 |
| Servo Pocket Width (Y) | 12.2 mm | 8 – 20 |
| Servo Pocket Length (X) | 23 mm | 10 – 40 |
| Servo Pocket Depth | 28.5 mm | 15 – 35 |
| Lower Link Length | 120 mm | 80 – 160 |
| Lower Link Width | 20 mm | 10 – 30 |
| Lower Link Thickness | 10 mm | 5 – 20 |
| Lower Link Solid End Margin | 10 mm | 5 – 20 |
| Lower Link Side Margin | 4 mm | 2 – 8 |
| Lower Base Horn Hole D | 5.2 mm | 4.5 – 7 |
| Upper Link Length | 130 mm | 90 – 180 |
| Upper Link Width | 20 mm | 10 – 30 |
| Upper Link Thickness | 10 mm | 5 – 20 |
| Upper Solid End Margin | 10 mm | 5 – 20 |
| Upper Side Margin | 4 mm | 2 – 8 |
| Finger Width (Y) | 60 mm | 30 – 80 |
| Finger Length (Z) | 15 mm | 10 – 30 |
| Finger Thickness (X) | 5 mm | 2 – 8 |
| Finger Gap (closed) | 0.5 mm | 0.2 – 2 |
| Gripper Base Length (X) | 20 mm | 10 – 30 |
| Gripper Base Width (Y) | 60 mm | 30 – 80 |
| Gripper Base Thickness (Z) | 10 mm | 5 – 20 |
Every value above is a live dimension. Open a model like this in the editor and each one becomes a slider you can drag before exporting.
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