cad-Integration/SimpleCADAPI-master/docs/stdlib/make_helical_ring_gear_rsolid.md

make_helical_ring_gear_rsolid

API Definition

def make_helical_ring_gear_rsolid(n_teeth: int, module: float, pressure_angle: float = 20.0, helix_angle: float = 25.0, gear_height: float = 8.0, rim_thickness: float = 3.0, backlash: float = 0.0, *, addendum_factor: float = 1.0, clearance_factor: float = 0.25) -> Solid

Source: std/gear.py

Import Surface

• standard library: import simplecadapi as scad then scad.std.gear.make_helical_ring_gear_rsolid(...); direct submodule import: from simplecadapi.std.gear import make_helical_ring_gear_rsolid

Description

Create an internal helical ring gear.

The outer rim is extruded directly. The internal tooth void is built as a small-step ruled loft through rotated copies of the internal profile, then subtracted from the rim. Ruled sections avoid smooth loft bulging in STEP exports while preserving stable section correspondence.

Parameters

n_teeth

• Type: int
• Description: Number of internal teeth (>= 3).

module

• Type: float
• Description: Gear module in mm.

pressure_angle

• Type: float, default 20
• Description: Pressure angle in degrees.

helix_angle

• Type: float, default 25
• Description: Helix angle in degrees.

gear_height

• Type: float, default 8.0
• Description: Ring gear thickness along Z in mm.

rim_thickness

• Type: float, default 3.0
• Description: Thickness of the rim beyond the tooth roots in mm.

backlash

• Type: float, default 0.0
• Description: Circumferential tooth-space clearance at the pitch circle in mm.

addendum_factor

• Type: float, default 1.0
• Description: Internal tooth addendum as a multiple of module.

clearance_factor

• Type: float, default 0.25
• Description: Internal tooth root clearance beyond the addendum, as a multiple of module.