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# Two-Disc Cycloidal Gearbox Design # Two-Disc Cycloidal Gearbox Design
## 1. Project Description #### 1. Project Description
The two-disc cycloidal gearbox is designed to convert high-speed, low-torque input from a stepper motor into low-speed, high-torque output. It utilizes two synchronized cycloidal discs that rotate in opposite phases, interacting with drive pins to transmit motion to an output shaft. The two-disc cycloidal gearbox is designed to convert high-speed, low-torque input from a stepper motor into low-speed, high-torque output. It utilizes two synchronized cycloidal discs that rotate in opposite phases, interacting with drive pins to transmit motion to an output shaft.
This configuration minimizes backlash and distributes load across multiple contact points, offering smooth and powerful transmission. The system is fully enclosed and features multiple mounting options for external attachments. This configuration minimizes backlash and distributes load across multiple contact points, offering smooth and powerful transmission. The system is fully enclosed and features multiple mounting options for external attachments.
Scalability: - **Scalability**: Thanks to its parametric design, the gearbox can be scaled up for larger loads or resized to fit custom dimensions. The disc radius, bolt spacing, and housing can all be edited easily via CAD.
Thanks to its parametric design, the gearbox can be scaled up for larger loads or resized to fit custom dimensions. The disc radius, bolt spacing, and housing can all be edited easily via CAD.
## 2. Application & Use Cases #### 2. Application & Use Cases
### Applications ##### Applications
- Robotics joints and arms - Robotics joints and arms
- CNC rotary tables - CNC rotary tables
- Precision camera mounts - Precision camera mounts
- Automated actuators - Automated actuators
- Small-scale industrial machines - Small-scale industrial machines
### How to Use ##### How to Use
- Mount the gearbox base to your frame using the provided holes. - Mount the gearbox base to your frame using the provided holes.
- Connect the NEMA-17 motor shaft to the input via the motor shaft connector. - Connect the NEMA-17 motor shaft to the input via the motor shaft connector.
@ -30,10 +29,9 @@ Thanks to its parametric design, the gearbox can be scaled up for larger loads o
- Ensure lubrication (grease) between the discs and drive pins for smoother performance and longer lifespan. - Ensure lubrication (grease) between the discs and drive pins for smoother performance and longer lifespan.
#### 3. Engineering Drawings
## 3. Engineering Drawings ##### Description
### Description
The design is a compact, scalable cycloidal gearbox featuring two cycloidal discs, intended for high-torque, low-speed applications. The modular nature allows for modifications in both size and material type. The current version has a diameter of 90 mm and a height of 54 mm. The design is a compact, scalable cycloidal gearbox featuring two cycloidal discs, intended for high-torque, low-speed applications. The modular nature allows for modifications in both size and material type. The current version has a diameter of 90 mm and a height of 54 mm.
- 2D & 3D Engineering Drawings Include: - 2D & 3D Engineering Drawings Include:
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- Mounting hole patterns - Mounting hole patterns
## 4. List of Materials & Components #### 4. List of Materials & Components
### Standard Components ##### Standard Components
| Part | Quantity | Approx. Size | Notes | | Part | Quantity | Approx. Size | Notes |
| ------------- | -------- | -------------------------------------------------- | ----------------------- | | ------------- | -------- | -------------------------------------------------- | ----------------------- |
@ -59,7 +57,7 @@ The design is a compact, scalable cycloidal gearbox featuring two cycloidal disc
| Bearing | 4 | Ø32 mm (outer) × Ø20 mm (inner) × 7 mm (thickness) | Disc and input supports | | Bearing | 4 | Ø32 mm (outer) × Ø20 mm (inner) × 7 mm (thickness) | Disc and input supports |
| Stepper Motor | 1 | NEMA-17 | Input source | | Stepper Motor | 1 | NEMA-17 | Input source |
### Bolts & Nuts (*with available size approximations*) ##### Bolts & Nuts (*with available size approximations*)
Note: If a bolt is slightly longer than needed, it can be trimmed using a saw. Nut sizes should fit snugly but not too tight. Note: If a bolt is slightly longer than needed, it can be trimmed using a saw. Nut sizes should fit snugly but not too tight.
@ -83,7 +81,7 @@ Note: If a bolt is slightly longer than needed, it can be trimmed using a saw. N
- May require slight sanding to fit perfectly. - May require slight sanding to fit perfectly.
- 1 × Nut: M3 (Edge-to-edge ≈ 5.4 mm, Thickness ≈ 2.5 mm) - 1 × Nut: M3 (Edge-to-edge ≈ 5.4 mm, Thickness ≈ 2.5 mm)
### 3D-Printed Components ##### 3D-Printed Components
- Material: PLA (tested), PETG (recommended for durability) - Material: PLA (tested), PETG (recommended for durability)
- Parts: Housing, base cover, discs, shaft connectors, output caps, circlips - Parts: Housing, base cover, discs, shaft connectors, output caps, circlips
- Infill: Suggested 40% or more for torque applications - Infill: Suggested 40% or more for torque applications