model-a/tandy_lid.py

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Python
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import cadquery as cq
import dimensions as dim
from utils import export
from components import screen_pillars
viewport_cutout = (
cq.Sketch().trapezoid(dim.vis_w, dim.vis_h, 90, mode="a").vertices().fillet(2)
)
screen_cutout = cq.Sketch().trapezoid(dim.scr_w, dim.scr_h, 90, mode="a")
# Circuit board and cable hole.
# This is in the back of the screen, and is a bit shorter in height than the
# screen. It's wider so it removes enough material to make the shape simpler.
board_cutout = cq.Sketch().trapezoid(
dim.scr_w + 5,
dim.scr_h - 10,
90,
mode="a",
)
kbd_cable_hole = cq.Sketch().trapezoid(20, 9, 90, mode="a").vertices().fillet(1)
# y needs to be inverted because this is the top side, and there's 2 pillars we don't use
mounting_pillar_positions = [(x, -y) for x, y in dim.mounting_pillar_positions[:-2]]
mounting_pillars = (
cq.Sketch()
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.push(mounting_pillar_positions)
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.trapezoid(screen_pillars.pillar_width, screen_pillars.pillar_height, 90, mode="a")
.circle(dim.ti_radius, mode="s")
.clean()
)
def model():
return (
cq.Workplane("XY")
.workplane()
.tag("mid_height")
.box(dim.width, dim.tl_height, dim.tl_full_thickness)
# The screen goes rotated
.faces(">Z")
.transformed(rotate=(dim.tl_scr_angle, 0, 0))
# Move the screen "lower" so it doesn't interfere
# so much with the back
.center(0, -2)
.tag("slanted")
# Arbitrary huge trapezoid to cut off the material *in front*
# of the inclined screen
.placeSketch(cq.Sketch().trapezoid(1000, 1000, 90, mode="a"))
.cutBlind(1000)
# Trim the top
.workplaneFromTagged("mid_height")
.workplane(offset=21)
.placeSketch(cq.Sketch().trapezoid(1000, 1000, 90, mode="a"))
.cutBlind(100)
# Make bottom smaller to fit with base
.faces(">X")
.workplane(centerOption="CenterOfBoundBox")
.center(-dim.tl_height / 2, -dim.tl_full_thickness / 2)
.placeSketch(
cq.Sketch()
.polygon(
[
(dim.tl_height_bottom, 0),
(dim.tl_height_bottom, dim.tl_full_thickness / 3),
(dim.tl_height, dim.tl_full_thickness - 21),
(dim.tl_height, dim.tl_full_thickness),
(dim.tl_height + 5, dim.tl_full_thickness + 5),
(dim.tl_height + 5, 0),
(dim.tl_height_bottom, 0),
]
)
.vertices()
.fillet(3)
)
.cutBlind(-1000)
# Fillet top of the object
.edges("|X and >Z")
.fillet(3)
# Cut off viewport hole so we can see the screen
.workplaneFromTagged("slanted")
.placeSketch(viewport_cutout)
.cutBlind(-dim.shell_t)
# Make hole for screen assembly so the whole screen fits
.workplaneFromTagged("slanted")
.workplane(offset=-dim.shell_t, centerOption="CenterOfBoundBox")
# Left bezel is wider than right one, so this hole is displaced to the left
.center(-3, 0)
.placeSketch(screen_cutout)
.cutBlind(-dim.scr_thickness)
# Make it hollow
.faces("<Z")
# Can't be exactly shell_t because cq fails
.shell(-dim.shell_t + 0.01)
# Cut hole for the screen board and cables
.workplaneFromTagged("slanted")
.workplane(offset=-dim.scr_thickness, centerOption="CenterOfBoundBox")
.placeSketch(board_cutout)
.cutBlind(-6)
.workplaneFromTagged("mid_height")
.workplane(offset=-dim.tl_full_thickness / 2, centerOption="CenterOfBoundBox")
.center(-dim.width / 2, dim.tl_height_bottom - dim.tl_height / 2 - dim.shell_t)
.placeSketch(mounting_pillars)
.extrude(10)
# Fillet the front edge of the screen case so it looks softer
.edges(">(0, -10, 5)")
.fillet(2)
)
if __name__ == "__main__":
model = model()
export(model, "tandy_lid.stl")
offset_width = -dim.width / 2
right_side = (
model.faces(">X")
.workplane(centerOption="CenterOfBoundBox", offset=offset_width)
.split(keepTop=True)
)
export(right_side, "tandy_lid_right.stl")
left_side = (
model.faces(">X")
.workplane(centerOption="CenterOfBoundBox", offset=offset_width)
.split(keepBottom=True)
)
export(left_side, "tandy_lid_left.stl")