Helical Spur Gear

Create a **fully editable parametric 3D model of a single helical spur gear** using the following exact specifications: * **Outside diameter (OD): 100 mm** * **Number of teeth: 20** * **Normal module: 5 mm** * **Helix angle: 20°** * **Pressure angle: 20°** * **Face width: 30 mm** * **Gear type: external helical gear** * **Helix hand: Right-hand** * **Bore diameter: 30 mm** * **Bore: through-hole** * Include a **keyway** in the bore: 8 mm wide × 3.3 mm deep * Gear teeth must have a proper involute tooth profile, not triangular or approximated teeth. * Generate the complete gear as a solid 3D body. The model must be **fully editable/parametric**, so that I can later change: 1. Number of teeth 2. Module 3. Pressure angle 4. Helix angle 5. Face width 6. Bore diameter 7. Keyway dimensions Do not create a mesh/STL-only model. Create a proper CAD solid with editable sketches/features/parameters where supported. Also provide the main dimensional parameters used to construct the gear and identify which parameters control the tooth geometry.

Parameters

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.