cadquery_files/cell_measure_robot/pneumatics/tconnector.py

import cadquery as cq
from cq_warehouse.thread import (
    IsoThread
)
from ocp_vscode import show, show_object
from cadquery.occ_impl.exporters import ExportTypes

MM = 1
IN = 25.4 *MM

distance = 15 *MM

seal_outer_diam = 8.2 *MM
seal_depth = 5.27 *MM
seal_torus_diam = 1.5 *MM
cartridge_small_diam = 7.6 *MM
cartridge_small_depth = 6.6 *MM
cartridge_large_diam = 8.85 *MM
cartridge_large_depth = 3.6 *MM

eps = 0.1 * MM

version = "G1_8"
# version = "M7"

if version == "G1_8":
    major_diam = 9.7 * MM  + eps*2
    pitch=0.907 * MM
    length=12 * MM

elif version == "M7":
    major_diam = 7 * MM + eps*2
    pitch=1 * MM
    length=8 * MM

else:
    raise ValueError("Invalid version")

iso_external_thread = IsoThread(
    major_diameter=major_diam,
    pitch=pitch,
    length=length,
    external=True,
    end_finishes=("chamfer", "chamfer"),
)

iso_external_core = (
    cq.Workplane("XY")
    .circle(iso_external_thread.min_radius)
    .extrude(iso_external_thread.length)
)
iso_external = iso_external_thread.cq_object.fuse(iso_external_core.val())

housing_diameter = cartridge_large_diam * 2
housing = (
    cq.Workplane("XY")
    .rect(housing_diameter, housing_diameter)
    .workplane(offset=iso_external_thread.length + distance)
    .center(0, housing_diameter/2)
    .rect(housing_diameter, housing_diameter * 2)
    .workplane(offset=iso_external_thread.length)
    .rect(housing_diameter, housing_diameter * 2)
    .loft()
)
# Side A
housing = housing.cut(iso_external)
# Side B
housing = housing.cut(iso_external.translate((0, 0, iso_external_thread.length + distance)))
# Cartidge hole
housing = (
    housing.faces(">Z")
    .workplane(centerOption="CenterOfBoundBox")
    .center(0, housing_diameter/2)
    .circle(cartridge_large_diam / 2)
    .cutBlind(-cartridge_large_depth)
)
housing = (
    housing.faces(">Z")
    .workplane(centerOption="CenterOfBoundBox")
    .center(0, housing_diameter/2)
    .circle(cartridge_small_diam / 2)
    .cutBlind(-cartridge_small_depth)
)
# seal as torus
seal_mid_diam = seal_outer_diam - seal_torus_diam - eps
seal = (
    cq.Workplane('XZ', origin = (seal_mid_diam/2, 0, 0))
    .circle(seal_torus_diam/2-eps)
    .revolve(360, (-seal_mid_diam/2, 0, 0), (-seal_mid_diam/2, 1, 0))
)
seal_position = iso_external_thread.length*2 + distance - seal_depth
seal_moved = seal.translate((0, housing_diameter, seal_position))
housing = housing.cut(seal_moved)

# straight channel
housing = (
    housing.faces("<Z")
    .circle(iso_external_thread.min_radius)
    .cutThruAll()
)

sweep = (
    housing.faces(">Z")
    .workplane(centerOption="CenterOfBoundBox", offset=-cartridge_small_depth)
    .center(0, housing_diameter/2)
    .circle(cartridge_small_diam / 2)
    .workplane(offset=cartridge_small_diam/2-(iso_external_thread.length + distance/2))
    .center(0, -housing_diameter)
    .transformed(rotate=(-90, 0, 0))
    .circle(seal_outer_diam / 2)
    .loft(combine=False)
)
housing = housing.cut(sweep)
housing = housing.faces("<Y or >Y").edges("not (>Z or <Z)").fillet(2)


# show_object(iso_external_thread.cq_object, name="iso_external_thread")
# show_object(iso_external_core, name="iso_external_core")
# show_object(iso_external, name="iso_external")
show_object(housing, name="housing")


with open(f"t_connector_{version}.step", "w") as fp:
   cq.exporters.exportShape(housing, ExportTypes.STEP, fp)