Brackets and mounts
3-Stage Telescopic Painting Arm
- Bounding box
- 678.0 × 130.0 × 900.2 mm
- Engine
- Precision B-rep
- Parameters
- 40
- Published
- November 2, 2026
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Free to download and use. See the terms.
The prompt
Create a fully parametric CAD model of a 3-stage telescopic painting arm for an autonomous aerial wall-painting drone. Overall requirements: - Overall extended length: 450 mm. - Overall retracted length: approximately 180–200 mm. - Total weight target: less than 450 g. - Designed for FDM 3D printing using PLA, PETG, or carbon-fiber reinforced nylon. - The model must be editable and fully parametric. Base Mount: - Rectangular mounting block with reinforced ribs. - Four M4 mounting holes on a 40 mm × 40 mm bolt pattern. - Central opening for routing electrical cables and paint tubing. - Rounded edges with 3 mm fillets. Telescopic Structure: - Three nested rectangular hollow aluminum-style rails. - Wall thickness: 2.5 mm. - Smooth sliding clearance of approximately 0.4 mm between stages. - Integrated mechanical travel stops to prevent accidental separation. - Internal cable and paint hose routing through all stages. - Add reinforcement ribs at each rail connection. Compliance Mechanism: - Spring-loaded pivot near the roller holder. - Compression spring housing integrated into the design. - Allow approximately 15–20 mm vertical compliance so the roller maintains consistent wall contact. - Include adjustable preload screw. Roller Assembly: - Cylindrical foam paint roller. - Roller width: 100 mm. - Roller diameter: 50 mm. - Stainless steel shaft with ball bearings on both ends. - Roller holder secured with M5 fasteners. - Replaceable roller design. Paint Delivery: - Internal paint tube routed through the telescopic arm. - Outlet positioned directly above the roller for uniform paint distribution. - Include tube retaining clips. Manufacturing Features: - M3, M4 and M5 threaded fastener locations. - Reinforcing gussets at all high-stress regions. - 2–3 mm edge fillets. - Avoid unsupported overhangs greater than 45° for FDM printing. Deliverables: - Complete parametric CAD model. - Exploded assembly. - Section view showing telescopic mechanism. - Front, rear, left, right, top, bottom and isometric views. - Dimensioned engineering drawing. - STEP and STL export compatibility. Design intent: The mechanism should resemble a lightweight robotic telescopic inspection arm mounted beneath a drone. The appearance must be clean, industrial, mechanically realistic and suitable for manufacturing and patent documentation. Do not generate the drone itself—generate only the telescopic painting arm assembly.
Parameters
| Name | Value | Range |
|---|---|---|
| Layout Gap | 60 mm | 30 – 100 |
| Base Width | 50 mm | 40 – 80 |
| Base Depth | 50 mm | 40 – 80 |
| Base Height | 20 mm | 10 – 40 |
| Base Fillet Radius | 3 mm | 1 – 8 |
| Mount Hole Pattern Spacing | 40 mm | 30 – 60 |
| Mount Hole Diameter | 4.5 mm | 3 – 6 |
| Central Opening Diameter | 10 mm | 8 – 20 |
| Stage1 Outer Width | 40 mm | 30 – 60 |
| Stage1 Outer Depth | 40 mm | 30 – 60 |
| Stage1 Length (Outermost) | 160 mm | 120 – 200 |
| Stage2 Length (Middle) | 150 mm | 110 – 190 |
| Stage3 Length (Innermost) | 140 mm | 100 – 180 |
| Wall Thickness | 2.5 mm | 1.5 – 4 |
| Stage Clearance | 0.4 mm | 0.2 – 1 |
| Travel Stop Lip Thickness | 3 mm | 1 – 5 |
| Roller Holder Width | 60 mm | 40 – 80 |
| Roller Holder Depth | 40 mm | 30 – 60 |
| Roller Holder Height | 30 mm | 20 – 50 |
| Foam Roller Diameter | 50 mm | 30 – 80 |
| Foam Roller Width | 100 mm | 50 – 150 |
| Shaft Diameter | 8 mm | 5 – 12 |
| Shaft Length | 120 mm | 80 – 160 |
| Bearing Seat Diameter | 12 mm | 8 – 16 |
| Bearing Seat Length | 10 mm | 5 – 15 |
| Spring Free Length | 30 mm | 20 – 50 |
| Spring Outer Diameter | 10 mm | 8 – 16 |
| Spring Wire Diameter | 1 mm | 0.5 – 2 |
| Spring Number of Coils | 6 | 4 – 10 |
| Preload Screw Diameter | 4 mm | 3 – 6 |
| Preload Screw Length | 20 mm | 10 – 30 |
| Preload Screw Head Dia | 8 mm | 6 – 12 |
| Preload Screw Head Height | 3 mm | 2 – 5 |
| Pivot Pin Diameter | 6 mm | 4 – 10 |
| Pivot Pin Length | 25 mm | 15 – 40 |
| Tube Outer Diameter | 6 mm | 4 – 8 |
| Tube Inner Diameter | 4 mm | 2 – 6 |
| Tube Length | 600 mm | 400 – 800 |
| Clip Size (cubic side) | 10 mm | 8 – 15 |
| Clip Thickness | 5 mm | 3 – 8 |
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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