129 lines
3.8 KiB
Python
129 lines
3.8 KiB
Python
# @author Arnaud Morin <arnaud.gfpv@mailops.fr>
|
|
# SPDX-License-Identifier: Apache-2.0
|
|
#
|
|
import cadquery as cq
|
|
|
|
from frame_params import (CF_DENSITY, FIT, TENON_L, THICKNESS, TBONE_D)
|
|
|
|
# frame-wide facts -- hardcoded here to match frame_params' own values;
|
|
# not linked by import any more, so keep them in step by hand
|
|
MOTOR_GAP = 78.0 # motor-to-motor gap on a true X, same as the prop
|
|
SPAR_H = 4.0 # the spar's own clear span
|
|
SPAR_OFFSET = 2.5
|
|
SPAR_TENON_POS = 9
|
|
|
|
LAP_W = THICKNESS + FIT
|
|
# How much len we add to add a crossing between lap
|
|
# I choose to add twice the thickness
|
|
LAP_OFFSET = 2.0 * THICKNESS
|
|
|
|
# Spar len is motor gap + extra so two spar can cross and fit together
|
|
# Extras are:
|
|
# SPAR_OFFSET which is used to position the mortese in motor base
|
|
# LAP_OFFSET to cross the two spar together
|
|
SPAR_LEN = MOTOR_GAP + (SPAR_OFFSET + LAP_OFFSET) * 2
|
|
# Motor axis
|
|
MOTOR_CENTER = (SPAR_LEN - MOTOR_GAP) / 2.0
|
|
# Tenon position
|
|
TENON_CENTER = MOTOR_CENTER + SPAR_TENON_POS
|
|
TENON_START = TENON_CENTER - TENON_L / 2.0
|
|
TENON_END = TENON_CENTER + TENON_L / 2.0
|
|
|
|
|
|
def spar():
|
|
part = (
|
|
cq.Workplane("XZ")
|
|
.polyline([
|
|
(0.0, 0.0),
|
|
(0.0, SPAR_H/2.0),
|
|
(TENON_START, SPAR_H/2),
|
|
(TENON_START, SPAR_H/2 + THICKNESS),
|
|
(TENON_END, SPAR_H/2 + THICKNESS),
|
|
(TENON_END, SPAR_H/2),
|
|
(SPAR_LEN - TENON_END, SPAR_H/2),
|
|
(SPAR_LEN - TENON_END, SPAR_H/2 + THICKNESS),
|
|
(SPAR_LEN - TENON_START, SPAR_H/2 + THICKNESS),
|
|
(SPAR_LEN - TENON_START, SPAR_H/2),
|
|
(SPAR_LEN, SPAR_H/2),
|
|
(SPAR_LEN, 0.0),
|
|
])
|
|
.mirrorX()
|
|
.extrude(THICKNESS)
|
|
)
|
|
|
|
# Cut the overlaps: half-lap notches, centred LAP_OFFSET on each end
|
|
cut = (
|
|
cq.Workplane("XZ")
|
|
.polyline([
|
|
(LAP_OFFSET - LAP_W / 2.0, 0.0),
|
|
(LAP_OFFSET + LAP_W / 2.0, 0.0),
|
|
(LAP_OFFSET + LAP_W / 2.0, SPAR_H / 2.0),
|
|
(LAP_OFFSET - LAP_W / 2.0, SPAR_H / 2.0),
|
|
])
|
|
.close()
|
|
.extrude(THICKNESS)
|
|
)
|
|
part = part.cut(cut)
|
|
|
|
# Second cut
|
|
cut = (
|
|
cq.Workplane("XZ")
|
|
.polyline([
|
|
(SPAR_LEN - LAP_OFFSET + LAP_W / 2.0, 0.0),
|
|
(SPAR_LEN - LAP_OFFSET - LAP_W / 2.0, 0.0),
|
|
(SPAR_LEN - LAP_OFFSET - LAP_W / 2.0, SPAR_H / 2.0),
|
|
(SPAR_LEN - LAP_OFFSET + LAP_W / 2.0, SPAR_H / 2.0),
|
|
])
|
|
.close()
|
|
.extrude(THICKNESS)
|
|
)
|
|
part = part.cut(cut)
|
|
|
|
# T-Bones on tenons (x, z)
|
|
tbones = [
|
|
# First tenon (upper left)
|
|
(TENON_START - TBONE_D/2 + 0.05, SPAR_H/2),
|
|
(TENON_END + TBONE_D/2 - 0.05, SPAR_H/2),
|
|
# lower left
|
|
(TENON_START - TBONE_D/2 + 0.05, -SPAR_H/2),
|
|
(TENON_END + TBONE_D/2 - 0.05, -SPAR_H/2),
|
|
# upper right
|
|
(SPAR_LEN - TENON_START + TBONE_D/2 - 0.05, SPAR_H/2),
|
|
(SPAR_LEN - TENON_END - TBONE_D/2 + 0.05, SPAR_H/2),
|
|
# lower right
|
|
(SPAR_LEN - TENON_START + TBONE_D/2 - 0.05, - SPAR_H/2),
|
|
(SPAR_LEN - TENON_END - TBONE_D/2 + 0.05, - SPAR_H/2),
|
|
]
|
|
|
|
# Cut the T-Bones
|
|
cut = cq.Workplane("XZ")
|
|
for x, z in tbones:
|
|
cut = cut.moveTo(x, z).circle(TBONE_D/2.0)
|
|
part = part.cut(cut.extrude(THICKNESS))
|
|
|
|
# Center the part
|
|
part = part.translate((-SPAR_LEN / 2.0, THICKNESS / 2.0, 0.0))
|
|
|
|
return part
|
|
|
|
|
|
result = spar()
|
|
|
|
assert result.solids().size() == 1, "spar is not one solid"
|
|
|
|
# Mass report
|
|
def report():
|
|
vol = result.val().Volume()
|
|
print(f" Mass = {vol * CF_DENSITY:5.2f} g")
|
|
print(f" Mass x4 = {4 * vol * CF_DENSITY:5.2f} g")
|
|
|
|
# Running outside CQ-editor
|
|
if "show_object" not in globals():
|
|
def show_object(*args, **kwargs):
|
|
pass
|
|
|
|
show_object(result)
|
|
|
|
if __name__ == "__main__":
|
|
report()
|