CadQuery thread (method not recommended)

cadquery_thread.py

import cadquery
from Helpers import show

helical_radius = 6.0
core_radius = 4.0
pitch = 2.0  # length per revolution
length = 12.0

def helical_path(p, l, r):
    wire = cadquery.Wire.makeHelix(p, l, r, angle=0)
    shape = cadquery.Wire.combine([wire])
    path = cadquery.Workplane("XY").newObject([shape])
    return path

# Inverted Thread profile
# FIXME: thread model must extend past helical_radius to make a clean cut
points = [
    (0.5 * pitch, helical_radius * 1.01),
    (0, core_radius),
    (-0.5 * pitch, helical_radius * 1.01),
]
# Inverted Thread: a single turn, around world origin
single_turn = helical_path(pitch, pitch, helical_radius).translate((0, 0, -pitch / 2))
inv_thread = cadquery.Workplane("ZX").center(-pitch / 2., 0) \
    .moveTo(*points[0]).polyline(points[1:]).close() \
    .sweep(single_turn, isFrenet=True)
# cross-section face of thread (at origin)
cross_section = cadquery.Workplane("XY").workplane(offset=-pitch / 2.) \
    .circle(helical_radius).extrude(pitch / 2.) \
    .cut(inv_thread).faces(">Z")
cross_section_face = cross_section.val() # cadquery.Face
cross_section_wire = cross_section_face.Wires().pop()  # cadquery.Wire
cross_section_wire.forConstruction = False

# Thread created from profile sweep
full_helix = helical_path(pitch, length, helical_radius)
my_model = cadquery.Workplane("XY").box(1,1,1)
my_model._addPendingWire(cross_section_wire)  # FIXME: using private function
my_model.sweep(full_helix, isFrenet=True)

# Use the following to render your model with grey RGB and no transparency
#show(cross_section)
show(my_model, (204, 204, 204, 0.5))

screenshot-01.png

screenshot-02.png

@dcowden: my reply in #195