Gears and transmission
Worm Drive Assembly (38T Wheel + 2-Start Worm Shaft)
- Bounding box
- 109.4 × 180.0 × 200.5 mm
- Engine
- Precision B-rep
- Parameters
- 21
- Published
- November 13, 2026
Download
Free to download and use. See the terms.
The prompt
Create a complete, dimensionally defined and parametric 3D CAD assembly of a cylindrical worm drive mechanism. Use the following dimensions as the initial design specification. ### A. Worm wheel - Outside diameter: 160 mm - Module: 4 mm - Number of teeth: 38 - Pitch diameter: 152 mm - Face width: 40 mm - Central bore diameter: 25 mm - Pressure angle: 20 degrees - Include a central hub and an 8 mm keyway. - Generate properly conjugate worm-wheel teeth. ### B. Worm shaft - Type: cylindrical two-start worm - Number of starts: 2 - Module: 4 mm - Pitch diameter: 40 mm - Major diameter: 48 mm - Root diameter: approximately 30.4 mm - Thread length: 50 mm - Lead angle: approximately 11.3 degrees - Pressure angle: 20 degrees - Include bearing journals, shaft shoulders and end extensions for mounting a handle or coupling. ### C. Assembly dimensions - Gear reduction ratio: 19:1 - Worm-wheel pitch diameter: 152 mm - Worm pitch diameter: 40 mm - Centre distance: 96 mm - Position the worm shaft perpendicular to the worm-wheel axis. - Ensure correct tooth engagement and rotational clearance. ### D. CAD requirements 1. Generate the worm shaft and worm wheel as separate solid CAD parts. 2. Assemble them with the specified centre distance. 3. Generate actual helical worm threads and compatible wheel teeth. 4. Do not use simple cosmetic teeth or overlapping geometry. 5. Provide editable sketches, dimensions and feature history. 6. Include a sectional view showing the meshing teeth. 7. Include a complete assembly view and an exploded view. 8. Export the assembly and individual components in STEP format. Before finalizing, verify the tooth geometry, backlash, interference and contact between the two components. Clearly report any assumptions or dimensions that need adjustment.
Parameters
| Name | Value | Range |
|---|---|---|
| Module | 4 mm | 1 – 10 |
| Wheel Teeth | 38 count | 12 – 100 |
| Face Width | 40 mm | 10 – 80 |
| Bore Diameter | 25 mm | 8 – 60 |
| Hub Diameter | 60 mm | 30 – 120 |
| Hub Length | 50 mm | 20 – 90 |
| Keyway Width | 8 mm | 3 – 20 |
| Keyway Depth | 3.3 mm | 1 – 8 |
| Wheel Helix Angle | 11.31 deg | 0 – 30 |
| Worm Starts | 2 count | 1 – 4 |
| Worm Pitch Diameter | 40 mm | 15 – 90 |
| Worm Major Diameter | 48 mm | 20 – 110 |
| Worm Root Diameter | 30.4 mm | 10 – 90 |
| Thread Length | 50 mm | 15 – 120 |
| Pressure Angle | 20 deg | 10 – 30 |
| Bearing Journal Diameter | 25 mm | 10 – 60 |
| Bearing Journal Length | 30 mm | 10 – 80 |
| End Extension Diameter | 20 mm | 8 – 50 |
| End Extension Length | 35 mm | 10 – 90 |
| Centre Distance | 96 mm | 40 – 180 |
| Exploded View Gap (X) | 60 mm | 50 – 200 |
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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