Unlike spur gears where the tooth profile is extruded linearly, a helical gear requires a helical sweep. The tooth profile is swept along a helix with lead $L$:
$$ L = \frac\pi \cdot d\tan \beta $$
For a face width $F$, the angular twist $\phi$ across the gear face is: $$ \phi = \frac2\pi \cdot FL $$ helical gear generator
Software-Based Generators
Discretize the involute from root radius to outer radius. Generate the symmetric tooth profile (left and right flanks) and add root fillet (usually a trochoid or circular arc). The number of points controls accuracy vs. performance. Unlike spur gears where the tooth profile is
The generation of a helical gear involves:
For rapid prototyping, you do not need a $50,000 hobbing machine. Tools like FreeCAD’s Gear Workbench or OpenSCAD’s MCAD library act as excellent helical gear generators. They output .STL files. Software-Based Generators
Depending on your production method, you will use a different type of generator.
Export to STEP, STL, or native CAD formats. For FEA, a clean manifold mesh is essential.