cadquery/monitor/upper_arm.py

# This is the arm from the monitor to the "elbow"

import cadquery2 as cq
from cadquery2 import exporters

from hinge import hinge_gap, hinge_w, hinge_profile_1, hinge_profile_2, hinge_t

# monitor hinge dimensions
inner_monitor_hinge = 3.2 / 2
outer_monitor_hinge = hinge_w / 2

monitor_hinge_shape = (
    cq.Sketch().circle(outer_monitor_hinge).circle(inner_monitor_hinge, mode="s")
)

# Both hinges are the same shape, just one is outer and the other inner
elbow_hinge_shape = (
    cq.Sketch().circle(outer_monitor_hinge).circle(inner_monitor_hinge, mode="s")
)

arm_length = 150
arm_width = hinge_gap

lower_arm = (
    cq.Workplane("XY")
    .rect(hinge_w, hinge_gap)
    .extrude(arm_length)
    .edges("|Z or <Z or >Z")
    .fillet(0.25)
    .faces(">Y")
    # Add hinge that connects to the monitor
    .workplane(centerOption="CenterOfBoundBox")
    .center(0, arm_length / 2 + (outer_monitor_hinge - inner_monitor_hinge))
    .placeSketch(monitor_hinge_shape)
    .extrude(-hinge_gap)
    .center(0, -(arm_length + outer_monitor_hinge))
    # Add hinge that connects to the elbow
    .transformed(rotate=cq.Vector(0, 0, 180))
    .workplane(offset=(20 - arm_width) / 2)
    .center(-hinge_w / 2, 0)
    .tag("hingeplane")
    .placeSketch(hinge_profile_1)
    .extrude(-hinge_t)
    .workplaneFromTagged("hingeplane")
    .workplane(offset=-hinge_t - hinge_gap)
    .placeSketch(hinge_profile_2)
    .extrude(-hinge_t)
    .workplaneFromTagged("hingeplane")
    .center(+hinge_w / 2, 0)
    .rect(hinge_w, hinge_w + 6)
    .extrude(-(2 * hinge_t + hinge_gap))
)

exporters.export(lower_arm, "upper_arm.stl")