cadquery/monitor/upper_arm.py

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Python
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# This is the arm from the monitor to the "elbow"
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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")
)
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# 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")
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)
arm_length = 150
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arm_width = hinge_gap
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upper_arm = (
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cq.Workplane("XY")
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.rect(hinge_w, hinge_gap)
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.extrude(arm_length)
.edges("|Z or <Z or >Z")
.fillet(0.25)
.faces(">Y")
# Add hinge that connects to the monitor
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.workplane(centerOption="CenterOfBoundBox")
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.center(0, arm_length / 2 + (outer_monitor_hinge - inner_monitor_hinge))
.placeSketch(monitor_hinge_shape)
.extrude(-hinge_gap)
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.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")
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.placeSketch(hinge_profile_1)
.extrude(-hinge_t)
.workplaneFromTagged("hingeplane")
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.workplane(offset=-hinge_t - hinge_gap)
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.placeSketch(hinge_profile_2)
.extrude(-hinge_t)
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.workplaneFromTagged("hingeplane")
.center(+hinge_w / 2, 0)
.rect(hinge_w, hinge_w + 6)
.extrude(-(2 * hinge_t + hinge_gap))
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)
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exporters.export(upper_arm, "upper_arm.stl")